CN111629648B - Endoscope with a lens - Google Patents

Abstract

The invention provides an endoscope capable of realizing position limitation of a stand upright rod and a rotating shaft, improvement of stand performance of the stand upright rod and reduction of diameter of a front end part. The endoscope is provided with: an insertion section; an operation unit; a stand assembly; a rotation shaft; a stand connected to one end of the rotation shaft and guiding the treatment tool; a standing stand upright having a main body, a base end and a front end; a pole accommodating chamber provided in the standing platform assembly and having an exposure window exposing a 1 st pole side surface of the standing platform upright pole; a partition wall provided between the rod accommodation chamber and the stand and having a holding hole for supporting the rotation shaft; an annular seal member through which the rotary shaft is inserted; a cover detachably covering the exposure window; and a 1 st restriction portion provided on at least one of a body portion side surface, which is a side surface of the lever body portion, of the 1 st lever side surface and a cover inner surface of the cover on the stand upright side, and restricting displacement of the stand upright in the 1 st direction.

Description

Endoscope with a lens

Technical Field

The present invention relates to an endoscope including a stand for guiding a treatment tool guided from a distal end portion of an insertion portion.

Background

As an ultrasonic endoscope, an ultrasonic endoscope including an electronic scanning type ultrasonic transducer at a distal end portion of an insertion portion of the endoscope and a treatment tool outlet disposed on a proximal end side of the ultrasonic transducer at the distal end portion is known. In endoscopy using this ultrasonic endoscope, for example, while an ultrasonic image of a lesion is acquired by an ultrasonic transducer, a puncture treatment tool introduced into the body is punctured into the lesion through a treatment tool channel and a treatment tool outlet to collect cells. In order to perform treatment at a desired position in the body cavity, it is necessary to change the direction of the guide-out from the distal end portion, and therefore, a treatment tool raising mechanism is provided at the distal end portion.

As such a treatment tool raising mechanism, a treatment tool raising mechanism including a raising table disposed in a raising table accommodating chamber, a rotation shaft, and a raising table upright is known (see patent documents 1 to 6). The standing platform accommodating chamber is formed on one side surface side of the partition wall provided in the front end portion. The rotation shaft is rotatably supported by a holding hole (through hole) of the partition wall.

One end of the rotating shaft is connected with a stand, and the other end is connected with a stand upright. Therefore, the partition wall is disposed between the standing platform and the standing platform upright. Further, a pole accommodating chamber accommodating the standing pole is formed on the other side surface side of the partition wall. According to this treatment tool raising mechanism, the operation of the operation lever of the operation unit of the ultrasonic endoscope is transmitted to the raising stage rod via the operation wire, and the raising stage rod is rotated, whereby the rotation shaft is rotated, and the raising stage can be displaced (rotated) about the rotation shaft.

In the treatment instrument raising mechanism using the raising stand, for example, a sealing member such as an O-ring (O ring) is disposed between the outer peripheral surface of the rotation shaft and the inner wall surface of the holding hole, so that blood, water, and the like are prevented from entering the rod storage chamber from the above-described raising stand storage chamber.

However, in the ultrasonic endoscope, as described above, the ultrasonic transducer is disposed on the distal end side of the distal end portion, and therefore, it is impossible to provide the distal end portion with a detachable cover structure as in the side-view type endoscope (for example, a duodenoscope) disclosed in the above-mentioned patent documents 3 to 6. Therefore, when replacing the stand upright and the seal member, etc., the distal end portion needs to be disassembled.

For this reason, for example, in the ultrasonic endoscope described in patent document 1, an opening for replacement (for removal) such as a stand bar and a sealing member is provided in a part of the wall surface of the rod accommodation chamber, the opening is watertight covered with a metal cover, and the metal cover is covered with a resin outer surface cover constituting a part of the outer peripheral surface of the distal end portion. The metal cover is provided with a movement limiting surface which is in contact with the rotating shaft to limit the movement of the rotating shaft and the upright post of the upright post to the metal cover side.

In the ultrasonic endoscope described inpatent document 2, as in patent document 1, an opening for replacement such as a stand upright and a sealing member is provided in a part of the wall surface of the rod accommodation chamber, and the opening is covered with a cover constituting a part of the outer peripheral surface of the distal end portion.

Technical literature of the prior art

Patent literature

Patent document 1: japanese patent laid-open publication 2016-131578

Patent document 2: japanese patent No. 6138404

Patent document 3: japanese patent application laid-open No. 2004-141315

Patent document 4: japanese patent application laid-open No. 2010-201020

Patent document 5: japanese patent laid-open publication 2016-174817

Patent document 6: japanese patent laid-open publication 2016-174818

Disclosure of Invention

Technical problem to be solved by the invention

Each time an ultrasonic endoscope is used for various examinations, treatments, and the like, a cleaning treatment using a cleaning liquid and a disinfectant is required. In this case, since the distal end portion including the treatment tool raising mechanism is miniaturized and its shape is complicated, it is required to improve the cleaning performance such as the inflow of the cleaning liquid, the insertion performance and the dewatering performance of the cleaning brush, and the ease of the cleaning work. For example, if the side surface of the stand on the partition wall side is in close contact with the partition wall, there is a possibility that the cleaning liquid or the like cannot flow into the side surface or that the cleaning brush cannot be brought into contact with the side surface. Therefore, a gap is preferably formed between the side surface of the standing board on the partition wall side and the partition wall.

However, when a gap is formed between the side surface of the stand on the partition wall side and the partition wall, the rotation shaft is displaced in the axial direction thereof in accordance with the rotation operation of the stand or the like. Therefore, as described inpatent document 2, only by covering the opening of the rod accommodation chamber with a cover, the position of the sealing member (airtight surface) may be displaced in the axial direction described above or the sealing member may slip against the inner wall surface of the holding hole and be broken.

Fig. 29 is an explanatory view for explaining a problem of the ultrasonic endoscope described in patent document 1. In the figure,reference numeral 502 denotes a distal end portion of an ultrasonic endoscope,reference numeral 504 denotes a partition wall,reference numeral 506 denotes a rotation shaft,reference numeral 508 denotes a stand,reference numeral 510 denotes a stand upright,reference numeral 514 denotes a rod accommodating chamber,reference numeral 516 denotes a metal cover,reference numeral 518 denotes a resin cover, andreference numeral 520 denotes a sealing member.

As shown byreference numeral 500A in fig. 29, in the ultrasonic endoscope described in patent document 1, the opening of therod accommodating chamber 514 is covered with ametal cover 516 and aresin cover 518. In this ultrasonic endoscope, themetal cap 516 is brought into contact with the connecting portion of therotation shaft 506 of the stand upright 510 with respect to theshaft center 506A of therotation shaft 506. This can improve the replaceability of thestand bar 510, theseal member 520, and the like, and limit the positions of thestand bar 510 and therotation shaft 506.

However, as shown byreference numeral 500B in fig. 29, in order to improve the raising performance of the raisingtable pole 510 corresponding to the raising operation of the operation lever, which is not shown, it is necessary to lengthen the length LQ of the raising table pole 510 [ the length from the connection portion with the operation line, which is not shown, to the connection portion with the rotation shaft 506 (shaft center 506A) ] according to the principle of leverage. In this case, if the increase in the length IQ of the upright 510 and the reduction in diameter of thedistal end portion 502 are both achieved, the position of theaxial center 506A of therotation shaft 506 is shifted downward in the drawing in the cross section of thedistal end portion 502. Therefore, themetal cover 516 cannot be brought into contact with therotary shaft 506 or the like.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an endoscope capable of realizing positional restriction of a stand bar and a rotation shaft, improvement of the stand performance of the stand bar, and reduction of the diameter of a distal end portion.

Means for solving the technical problems

An endoscope for achieving the object of the present invention is provided with: an insertion portion having a front end and a base end; an operation section provided on the base end side of the insertion section and having an operation member; a stand assembly provided at the front end side of the insertion portion; a rotation shaft rotatably supported by the stand assembly; a stand coupled to one end of the rotation shaft and guiding a treatment tool guided from the stand assembly; a standing stand upright having a rod main body portion, a rod base end portion provided on one end side of the rod main body portion and connected to the other end of the rotary shaft, and a rod front end portion provided on the other end side of the rod main body portion; a rod accommodating chamber which is provided in the stand assembly, accommodates the stand upright rod rotatably about the rotation axis, and has an exposure window for exposing a 1 st rod side surface of the stand upright rod on a side opposite to the rotation axis side; an operation wire having a base end side connection portion connected to the operation member and a tip end side connection portion connected to a tip end portion of the lever of the stand upright, and rotating the rotation shaft via the stand upright by an operation of the operation member to raise the stand; a partition wall which is a part of the stand assembly, is provided between the rod accommodating chamber and the stand, and has a holding hole for supporting the rotation shaft; an annular sealing member through which the rotary shaft is inserted and which maintains air tightness between the outer peripheral surface of the rotary shaft and the inner wall surface of the holding hole; a cover detachably covering the exposure window; and a 1 st restriction portion provided on at least one of a body portion side surface, which is a side surface of the lever body portion, of the 1 st lever side surface and a lid inner surface of the lid on the stand upright post side, and interposed between the body portion side surface and the lid inner surface to restrict displacement of the stand upright post in the 1 st direction of the lid side in a direction parallel to the axis of the rotary shaft.

According to this endoscope, even when the length of the stand bar is extended, the displacement in the 1 st direction of the stand bar and the rotation shaft can be restricted without making the distal end portion of the insertion portion thick.

In the endoscope according to another aspect of the present invention, the partition wall includes a 1 st housing chamber wall surface that forms a bottom surface of the rod housing chamber on the stand side and in which the holding hole is opened, and includes a 2 nd restricting portion that is provided on at least one of a 2 nd rod side surface on the rotation axis side of the stand rod and a 1 st housing chamber wall surface, and that restricts displacement of the stand rod in a 2 nd direction on the opposite side to the 1 st direction between the 2 nd rod side surface and the 1 st housing chamber wall surface. This prevents displacement of the stand upright and the rotary shaft in the axial direction of the rotary shaft.

In the endoscope according to another aspect of the present invention, the exposure window exposes a rotation range of the stand upright which rotates around the rotation axis in the rod accommodating chamber. Thereby, the restriction by the 1 st restriction portion can be performed at each rotation position of the stand upright.

In the endoscope according to the other aspect of the present invention, when the 1 st restriction portion is provided on the inner surface of the cover, the 1 st restriction portion has a shape of a rotating trajectory along at least a part of the main body side surface of the upright post rotating about the rotation axis, and is interposed between the main body side surface and the inner surface of the cover at each rotation position of the upright post. Thereby, the restriction by the 1 st restriction portion can be performed at each rotation position of the stand upright.

In the endoscope according to the other aspect of the present invention, the partition wall has a 2 nd housing chamber wall surface that forms a side surface of the rod housing chamber and is formed with a wire insertion hole through which the operation wire is inserted, and when the wire insertion hole is viewed from the distal end side of the stand unit, the center position of the wire insertion hole is displaced toward the stand side from the distal end portion of the rod. This can more reliably restrict the displacement of the upright post and the rotation shaft in the 1 st direction.

In the endoscope according to another aspect of the present invention, the seal member is disposed between the inner wall surface of the holding hole and the outer peripheral surface of the rotary shaft, and a part of the seal member is exposed from the holding hole opening on the stand side of the holding hole. This prevents blood, water, and the like from entering between the outer peripheral surface of the rotating shaft and the inner wall surface of the holding hole.

In an endoscope according to another aspect of the present invention, an annular seal member mounting groove is formed on an outer peripheral surface of a rotary shaft so as to extend from a position closer to a stand upright than a holding hole opening to a position closer to the stand than the holding hole opening, and a seal member is provided with: a 1 st wall portion in close contact with a groove bottom surface of the seal member mounting groove; a 2 nd wall portion closely contacting with the 1 st wall surface of the seal member mounting groove on the stand side; and a 3 rd wall portion having a region closely contacting the inner wall surface of the holding hole and an exposed region located closer to the stand side than the holding hole opening. This makes it possible to reliably maintain the airtight seal between the outer peripheral surface of the rotary shaft and the inner wall surface of the holding hole.

In the endoscope according to the other aspect of the present invention, the seal member has elasticity, and the 1 st wall portion is formed to have a width longer than the width of the seal member mounting groove in the axial direction of the rotary shaft, and the seal member is mounted in the seal member mounting groove in a state in which the 1 st wall portion is compressed in the axial direction of the rotary shaft. This can improve the sealing function of the sealing member.

In the endoscope according to another aspect of the present invention, a biasing member or an elastic member for biasing one of the 1 st wall portion and the 3 rd wall portion in a direction away from the other is provided between the 1 st wall portion and the 3 rd wall portion of the sealing member. This can improve the sealing function of the sealing member.

In the endoscope according to another aspect of the present invention, the rotary shaft is divided into a 1 st rotary shaft and a 2 nd rotary shaft in the axial direction of the rotary shaft with a 2 nd groove wall surface on the side of the stand upright of the seal member mounting groove as a boundary, the 1 st rotary shaft is connected to the stand upright at one end and has a 1 st connecting portion and a 2 nd groove wall surface at the other end, and the 2 nd rotary shaft is connected to the stand at one end and has a 2 nd connecting portion and a groove bottom surface and a 1 st groove wall surface connected to the 1 st connecting portion at the other end.

In the endoscope according to the other aspect of the present invention, when the direction on the opposite side to the 1 st direction is the 2 nd direction, one end of the rotation shaft is located at a position farther in the 2 nd direction than the holding hole opening on the standing table side of the holding hole, the partition wall has an opposing wall surface that is formed with the holding hole opening and that faces the standing table, and the seal member is disposed between the opposing wall surface and the standing table and has an insertion hole through which the rotation shaft is inserted, a 4 th wall portion that is in close contact with the opposing wall surface, and a 5 th wall portion that is in close contact with the side surface on the rotation shaft side of the standing table. This makes it possible to reliably maintain the airtight seal between the outer peripheral surface of the rotary shaft and the inner wall surface of the holding hole.

In the endoscope according to the other aspect of the present invention, an annular seal member mounting groove in which a seal member is externally fitted and an annular wall portion of a 1 st groove wall surface on a stand side constituting the seal member mounting groove are formed in an outer peripheral surface of the rotary shaft, the seal member mounting groove is formed in a position closer to the stand upright side than a holding hole opening on the stand side of the holding hole on the outer peripheral surface of the rotary shaft, and the annular wall portion covers a part of a seal side surface of the seal member facing the 1 st groove wall surface by the 1 st groove wall surface. This improves the cleaning performance of the seal side surface of the seal member, and facilitates the cleaning operation.

In an endoscope according to another aspect of the present invention, a notch is provided in a part of an outer peripheral surface of an annular wall portion. This improves the cleaning performance of the seal side surface of the seal member, and facilitates the cleaning operation.

In the endoscope according to another aspect of the present invention, the diameter of the outer peripheral surface of the annular wall portion is smaller than the diameter of the outer peripheral surface of the sealing member. This improves the cleaning performance of the seal side surface of the seal member, and can facilitate the cleaning operation.

In the endoscope according to another aspect of the present invention, a cover airtight holding member for holding airtightness between the exposure window and the cover is provided.

Effects of the invention

The endoscope of the present invention can realize the position limitation of the upright post and the rotating shaft of the upright post, the improvement of the upright performance of the upright post and the reduction of the diameter of the front end part.

Drawings

Fig. 1 is a schematic view of an ultrasonic inspection system to which the endoscope of the present invention is applied.

Fig. 2 is a schematic view showing a pipe structure of the ultrasonic endoscope.

Fig. 3 is an external perspective view of the distal end portion of the insertion portion.

Fig. 4 is a left side view of the distal end portion of the insertion portion as viewed from the distal end side thereof.

Fig. 5 is a right side view of the distal end portion of the insertion portion when viewed from the distal end side thereof.

Fig. 6 is an exploded perspective view of the distal end portion of the insertion portion.

Fig. 7 is an exploded perspective view of the riser assembly.

Fig. 8 is a right side view of the stand assembly when the front end portion is viewed from the front end side.

Fig. 9 is a front view of the stand assembly when the front end portion is viewed from the front end side.

Fig. 10 is a schematic diagram showing an example of the stand operation mechanism.

Fig. 11 is an explanatory view for explaining the rotation of the stand corresponding to the operation of the operation lever.

Fig. 12 is an external perspective view of the stand.

Fig. 13 is an external perspective view of the stand upright from the side of the pole storage cover.

Fig. 14 is an external perspective view of the stand upright from the stand side.

Fig. 15 is an explanatory view for explaining a connection state of the stand rotation shaft and the pole rotation shaft.

Fig. 16 is an explanatory view for explaining an exposure window of the lever accommodating chamber and the lever accommodating cover.

Fig. 17 is a cross-sectional view of the stand, stand upright, and rotation shaft inserted through the holding hole.

Fig. 18 is an enlarged view of the cover inner surface of the lever receiving cover.

Fig. 19 is an enlarged view of the rod front end portion and the wire insertion hole in fig. 17.

Fig. 20 is an enlarged view of the rotary shaft and the seal member in fig. 17.

Fig. 21 is an enlarged view of the 1 st wall portion of the seal member.

Fig. 22 is an explanatory diagram for explaining a modification of the 1 st restriction portion and the 2 nd restriction portion.

Fig. 23 is a cross-sectional view of a seal member of modification 1.

Fig. 24 is a cross-sectional view of an O-ring ofmodification 2.

Fig. 25 is an enlarged view of the O-ring of fig. 24.

Fig. 26 is a cross-sectional view of the annular wall portion taken along line 26-26 in fig. 25.

Fig. 27 is a cross-sectional view of a modification of the annular wall portion.

Fig. 28 is an explanatory view of a 1 st restriction portion of another embodiment provided on the inner surface of the cover of the lever housing cover.

Fig. 29 is an explanatory view for explaining a problem of the ultrasonic endoscope described in patent document 1.

Detailed Description

[ Structure of ultrasonic inspection System and ultrasonic endoscope ]

Fig. 1 is a schematic view of anultrasonic inspection system 2 to which the endoscope of the present invention is applied. As shown in fig. 1, theultrasonic inspection system 2 includes anultrasonic endoscope 10 that captures an image of the inside of a body cavity (lumen) of a subject, anultrasonic processor device 12 that generates an ultrasonic image, anendoscope processor device 14 that generates an endoscopic image, alight source device 16 that supplies illumination light for illuminating the inside of the body cavity to theultrasonic endoscope 10, and amonitor 18 that displays the ultrasonic image and the endoscopic image.

Theultrasonic endoscope 10 corresponds to the endoscope of the present invention, and includes aninsertion portion 20, anoperation portion 22, and auniversal cord 24.

Theinsertion portion 20 is inserted into various body cavities. Theoperation unit 22 is connected to the proximal end side of theinsertion unit 20, and receives an operation by an operator.

One end of theuniversal cord 24 is connected to theoperation unit 22. The other end of theuniversal cord 24 is provided with anultrasonic connector 27 connected to theultrasonic processor device 12, an endoscope connector 28 connected to theendoscope processor device 14, and alight source connector 30 connected to thelight source device 16. Awater supply tank 118 is connected to thelight source connector 30 via ahose 32 for supplying air and water, and asuction pump 124 is connected to the light source connector via ahose 34 for suction.

Theultrasonic processor device 12 generates an ultrasonic image based on an ultrasonic detection signal output from theultrasonic endoscope 10. Theendoscope processor device 14 generates an endoscopic image from the image pickup signal output from theultrasonic endoscope 10.

Thelight source device 16 is connected to an incident end of aninsertion portion 20, anoperation portion 22, auniversal cord 24, and a light guide 128 (see fig. 2) inserted into thelight source connector 30. Thelight source device 16 supplies illumination light to the incident end of thelight guide 128. The illumination light is irradiated from thelight guide 128 to the observed portion through a pair of illumination windows 90 (see fig. 3) described later.

Themonitor 18 is connected to both theultrasonic processor device 12 and theendoscope processor device 14, and displays an ultrasonic image generated by theultrasonic processor device 12 and an endoscope image generated by theendoscope processor device 14. The display of these ultrasonic images and endoscopic images may be performed by selectively displaying only one of them or by simultaneously displaying both of them.

Theoperation unit 22 is provided with a gas supply/water supply button 36 and asuction button 38 in parallel, and a pair ofcorner buttons 42, anoperation lever 43, a treatmenttool insertion port 44 such as a forceps opening, and the like.

Theinsertion portion 20 has a distal end, a proximal end, and a longitudinal axis, and includes adistal end portion 50, abent portion 52, and asoft portion 54 in this order from the distal end side toward the proximal end side. Thefront end 50 is formed of a hard member, also referred to as a front end hard portion. Anultrasonic transducer 62 described later is provided at thedistal end portion 50, and aballoon 64 for covering theultrasonic transducer 62 is detachably attached.

One end of thebent portion 52 is connected to the base end side of thedistal end portion 50, and the other end is connected to the distal end side of thesoft portion 54. The bendingportion 52 is configured to be bendable, and is remotely bent by turning the pair ofcorner buttons 42 described above. This makes it possible to orient thedistal end 50 in a desired direction.

Thesoft portion 54 is thin and long and has flexibility, and connects the bendingportion 52 and theoperation portion 22.

Fig. 2 is a schematic diagram showing a piping structure of theultrasonic endoscope 10. As shown in fig. 2, atreatment instrument channel 100, an air supply andwater supply line 102, and aballoon line 104, one end of which opens into the internal space of theballoon 64, are provided inside theinsertion portion 20 and theoperation portion 22.

One end of thetreatment instrument channel 100 is connected to a treatment instrument outlet 94 (see fig. 3) described later, and the other end is connected to the treatmentinstrument insertion port 44 of theoperation unit 22. Thesuction line 106 branches from thetreatment instrument channel 100, and thesuction line 106 is connected to thesuction button 38 of theoperation unit 22.

One end of the air supply andwater supply line 102 is connected to an air supply and water supply nozzle 92 (see fig. 3) described later, and the other end is branched into anair supply line 108 and awater supply line 110. Theair supply line 108 and thewater supply line 110 are connected to the air supply andwater supply button 36 of theoperation unit 22.

One end of theballoon pipe 104 is connected to a supply/discharge port 70a (see fig. 5) opened at a position inside theballoon 64 in the outer peripheral surface of thetip end portion 50, and the other end is branched into a balloonwater supply pipe 112 and a balloonwater discharge pipe 114. The balloonwater supply line 112 is connected to the air supply andwater supply button 36, and the balloonwater discharge line 114 is connected to thesuction button 38.

The air supply/water supply button 36 is connected to one end of anair supply line 116 leading to anair supply pump 129 and one end of awater supply line 120 leading to awater supply tank 118, in addition to theair supply line 108, thewater supply line 110, and the balloonwater supply line 112. Theair supply pump 129 is always operated in ultrasonic observation.

Thebranch line 122 branches from thegas supply line 116, and thebranch line 122 is connected to an inlet (above the liquid surface) of thewater supply tank 118. The other end of the watersupply source line 120 is inserted into the water supply tank 118 (below the liquid surface). When the internal pressure of thewater supply tank 118 increases due to the supply of air from theair supply pump 129 via thebranch pipe 122, water in thewater supply tank 118 is supplied to the watersupply source pipe 120.

The air supply andwater supply button 36 uses a well-known two-stage switching button. The air/water supply button 36 is switched between leakage of air supplied from theair supply line 116, ejection of air from the air/water supply nozzle 92, ejection of water from the air/water supply nozzle 92, and supply of water into theballoon 64 in response to an operation by an operator. The specific handover method is a known technique, and the description thereof is omitted (for example, refer to international publication No. 2015/151968).

Thesuction button 38 is connected to one end of asuction source line 126 in addition to thesuction line 106 and theballoon drain line 114. Asuction pump 124 is connected to the other end of thesuction source line 126. Thesuction pump 124 also operates throughout the ultrasound observation. Thesuction button 38 is a two-stage switching button similar to the air supply andwater supply button 36.

Thesuction button 38 is switched between communication with the external (atmospheric)suction source line 126, suction of various suctions from the treatment instrument outlet 94 (see fig. 3), and drainage of water in theballoon 64 in response to an operation by the operator. The specific handover method is a known technique, and the description thereof is omitted (for example, refer to international publication No. 2015/151968).

Returning to fig. 1, theoperation lever 43 of theoperation unit 22 is used for changing the direction of the treatment instrument guided out from the treatment instrument guide outlet 94 (see fig. 3), which will be described in detail later.

[ Structure of tip portion of insertion portion ]

Fig. 3 is an external perspective view of thedistal end portion 50 of theinsertion portion 20. Fig. 4 is a left side view of thedistal end 50 of theinsertion portion 20 when viewed from the distal end side thereof. Fig. 5 is a right side view of thedistal end 50 of theinsertion portion 20 when viewed from the distal end side thereof. Fig. 6 is an exploded perspective view of thedistal end portion 50 of theinsertion portion 20. In fig. 3 and 6, theballoon 64 is not illustrated. In fig. 6, thelight guide 128 and theendoscope observation section 80 described later are not shown.

As shown in fig. 3 to 6, thedistal end portion 50 is provided with anultrasonic observation portion 60 for acquiring an ultrasonic detection signal and anendoscope observation portion 80 for acquiring an imaging signal from the distal end side toward the proximal end side thereof. Astand 96 capable of changing the direction of guiding out the treatment instrument is provided between theultrasound observation unit 60 and theendoscope observation unit 80 at thedistal end portion 50. Thedistal end portion 50 includes aballoon 64, a housing member 72 (also referred to as an exterior member or a case), alever housing cover 76, and a stand assembly 200 (see fig. 6).

Theultrasonic observation unit 60 includes anultrasonic transducer 62 constituted by a plurality of ultrasonic vibrators. Each ultrasonic vibrator of theultrasonic transducer 62 is sequentially driven in accordance with a drive signal input from theultrasonic processor device 12. Thus, each ultrasonic vibrator sequentially generates ultrasonic waves toward the observed region, and receives ultrasonic echoes (echo signals) reflected at the observed region. Then, each ultrasonic vibrator outputs an ultrasonic detection signal (electric signal) corresponding to the received ultrasonic echo to theultrasonic processor device 12 via a signal cable (not shown) inserted into theinsertion portion 20, theuniversal cord 24, and the like. As a result, an ultrasonic image is generated in theultrasonic processor device 12.

In order to prevent attenuation of ultrasonic waves and ultrasonic echoes, theballoon 64 is attached to ahousing member 72 of thedistal end portion 50, which is formed in a bag shape that encloses theultrasonic transducer 62. Theballoon 64 is formed of an elastic material having stretchability, such as latex rubber, and has astretchable locking ring 66 provided at an opening end thereof. On the other hand, the lockinggroove 68 is provided between theultrasonic observation portion 60 of thedistal end portion 50 and the risingstage 96 over the entire circumference of thedistal end portion 50 in the circumferential direction. The lockingring 66 is fitted into the lockinggroove 68, whereby theballoon 64 is detachably attached to thedistal end portion 50.

Theballoon 64 is inserted into the body cavity in a contracted state so as to be in close contact with the outer wall surface of thehousing member 72 of thedistal end portion 50. When ultrasonic waves are generated from each ultrasonic vibrator of theultrasonic transducer 62 toward the site to be observed, water (deaerated water or the like) is supplied into theballoon 64 according to the operation of the air/water supply button 36, whereby theballoon 64 is inflated to come into contact with the inner wall of the body cavity. When theinsertion portion 20 is pulled out of the body cavity, the water inside theballoon 64 is discharged according to the operation of thesuction button 38, and theballoon 64 is contracted similarly to when theinsertion portion 20 is inserted into the body cavity.

Theendoscope observation portion 80 is provided at theinclined surface portion 86 of thehousing member 72 of thedistal end portion 50. Theinclined surface 86 is provided at a position on the base end side of atreatment instrument outlet 94 described later of thedistal end portion 50, and is formed obliquely with respect to the axial direction of thedistal end portion 50. Theendoscope observation portion 80 includes an observation portion and an illumination portion.

The observation portion of theendoscope observation portion 80 has an observation window 88 (see fig. 3). Although not shown, an objective lens of an observation optical system, a CCD (Charge Coupled Device: charge coupled device) type or CMOS (ComplementaryMetal Oxide Semiconductor: complementary metal oxide semiconductor) type imaging element disposed at an imaging position of the objective lens, and the like are disposed behind theobservation window 88. The imaging element captures an observation image obtained from theobservation window 88. The imaging device outputs an imaging signal of the observation image to theendoscope processor 14 via a signal cable, not shown, inserted into theinsertion portion 20, theuniversal cord 24, and the like. As a result, an endoscopic image is generated in theendoscope processor device 14.

The illumination unit of theendoscope observation unit 80 includes a pair of illumination windows 90 (see fig. 3), and the light emitting ends of the above-described light guides 128 are disposed behind therespective illumination windows 90. Therefore, as shown in fig. 2 described above, by connecting thelight source connector 30 to thelight source device 16, the illumination light irradiated from thelight source device 16 is guided to eachillumination window 90 via thelight guide 128, and is irradiated from eachillumination window 90 to the front side thereof.

In addition to theobservation window 88 and theillumination window 90 described above, the air supply andwater supply nozzle 92 is provided near theobservation window 88 in theinclined surface portion 86. The air supply/water supply nozzle 92 is connected to one end of the air supply/water supply line 102 shown in fig. 2 described above, and discharges water or air toward theobservation window 88 in order to clean foreign matter or the like adhering to the surface of theobservation window 88.

Thehousing member 72 holds or accommodates the above-described respective portions of theultrasound observation unit 60 and theendoscope observation unit 80, and astand 96 and astand assembly 200 described later. The portion of thehousing member 72 closer to the base end side than theultrasonic observation portion 60 is divided into two in the vertical direction in the drawing by taking a plane parallel to the axial direction of thetip portion 50 as a boundary. That is, thecase member 72 is configured by connecting the 1st case member 72a located at the lower side in the drawing and the 2nd case member 72b located at the upper side in the drawing. Further, the standingstand 96 and the standingstand unit 200 are accommodated between the 1st housing member 72a and the 2nd housing member 72 b.

The 1st housing member 72a holds theultrasonic observation portion 60 and has the lockinggroove 68. When thedistal end portion 50 is viewed from the distal end side thereof, agroove 74 is formed along the axial direction of thedistal end portion 50 on the right side surface (see fig. 5) of the 1st housing member 72a at a position closer to the distal end side than the lockinggroove 68. Thegroove 74 is formed such that at least a part thereof overlaps theultrasonic transducer 62 in the axial direction of thetip portion 50.

The supply/discharge port 70a, which is the opening on the distal end side of theballoon tube 104 shown in fig. 2, is opened at the base end of thegroove 74. Thus, water can be supplied to the interior of theballoon 64 through the water supply/discharge port 70a or water in the interior of theballoon 64 can be discharged.

The 2nd housing member 72b holds theendoscope observation portion 80 and has aslope 86. Atreatment instrument outlet 94 for guiding out a treatment instrument is formed in the upper surface of the 2nd housing member 72b on the distal end side of the endoscope observation portion 80 (the slope portion 86). When the 1st housing member 72a and the 2nd housing member 72b are coupled, a space for accommodating thestand 96, that is, astand accommodating chamber 94a is formed in thetreatment instrument outlet 94.

When thedistal end portion 50 is viewed from the distal end side thereof, a partition wall 73 (see fig. 6) constituting the right side surface of the standingplatform accommodating chamber 94a is formed so as to extend across both the 1st housing member 72a and the 2nd housing member 72 b. Further,fitting holes 75 for fitting the rod storage covers 76 are formed in a crossing manner in positions of the left side surfaces of the 1st housing member 72a and the 2nd housing member 72b and facing the rod storage chambers 212 (see fig. 6) of thestand assembly 200.

Thetreatment instrument channel 100 shown in fig. 2 described above is connected to the standingtable accommodating chamber 94a. Therefore, the treatment instrument inserted into the treatmentinstrument insertion port 44 is introduced into the body cavity from thetreatment instrument outlet 94 via thetreatment instrument channel 100 and thestand accommodating chamber 94a.

Thestand 96 is rotatably mounted to thestand assembly 200 in thestand accommodating chamber 94a via a rotation shaft 216 (see fig. 7) having a split structure, which will be described later. Thestand 96 changes the direction of the treatment instrument guided from thetreatment instrument channel 100 into thestand accommodating chamber 94a, and guides the treatment instrument from the treatmentinstrument guide outlet 94. Then, thestand 96 is rotated in thestand accommodating chamber 94a in accordance with the operation of theoperation lever 43, whereby the direction of guiding out the treatment instrument guided from the treatmentinstrument guiding outlet 94 into the body cavity can be changed, which will be described in detail later.

Thelever housing cover 76 corresponds to the cover of the present invention, and constitutes a part of the outer peripheral surface of thehousing member 72, that is, a part of the outer peripheral surface of thedistal end portion 50. Thelever receiving cover 76 is detachably attached to thestand assembly 200 by abolt 77 in a state of being fitted into thefitting hole 75 of thehousing member 72. Further, alid seal member 76a and a 1 st regulating portion 250 (see fig. 17) are provided on a lid inner surface 244 (see fig. 17) of thelever housing lid 76 on the side of thestand assembly 200, which will be described in detail later. Further, aninsertion hole 76b through which thebolt 77 is inserted is formed in thelever housing cover 76.

[ Structure of standing Table Assembly ]

Fig. 7 is an exploded perspective view of thestand assembly 200, fig. 8 is a right side view of thestand assembly 200 when thefront end portion 50 is viewed from the front end side, and fig. 9 is a front view of thestand assembly 200 when thefront end portion 50 is viewed from the front end side.

As shown in fig. 7 to 9 and fig. 6 described above, thestand assembly 200 is formed of, for example, a metallic material having corrosion resistance, and has abase 202 and apartition wall 204 extending from the base 202 toward the front end side. A part of the front end surface of thebase 202 constitutes a side surface on the base end side of thestanding room 94 a. Acommunication hole 202a that communicates with thetreatment instrument channel 100 connected to the proximal end side thereof is formed in the distal end surface of thebase 202. Thereby, thetreatment instrument channel 100 and thestand accommodating chamber 94a are connected via thecommunication hole 202a.

When thestand assembly 200 is viewed from the front end side thereof, thepartition wall 204 has aside wall surface 206 that is a left side surface and an opposingwall surface 208 that is a right side surface opposite to theside wall surface 206 and that opposes thestand 96.

Theside wall surface 206 is formed with arod accommodating chamber 212 for accommodating the standingpost 210. In other words, thepartition 204 is provided between the standing platform 96 (the standingplatform accommodating chamber 94 a) and the standing platform upright 210 (the rod accommodating chamber 212).

Thepartition wall 204 has a 1 st housingchamber wall surface 212a constituting the bottom surface of therod housing chamber 212 on the side of the standing table 96 and a 2 nd housingchamber wall surface 212b constituting the side surface of the rod housing chamber 212 (refer to fig. 7).

A holdinghole 214 that penetrates thepartition wall 204 along an axial direction of arotary shaft 216, which will be described later, that connects thestand 96 and thestand upright 210 to each other, and communicates with thestand accommodating chamber 94a is formed in the 1 st accommodatingchamber wall surface 212 a. The holdinghole 214 rotatably supports therotation shaft 216. Further, since the standing upright 210 in therod accommodating chamber 212 rotates (swings) about therotation axis 216, therod accommodating chamber 212 is formed in a fan shape (fan shape) about therotation axis 216.

A wire insertion hole 224 (see fig. 7) through which anoperation wire 222 described later is inserted is formed in the 2 nd housingchamber wall surface 212 b.

The surface side of thelever accommodation chamber 212 facing thelever accommodation cover 76 is open. Accordingly, therod accommodating chamber 212 has an exposure window 218 (see fig. 7) formed by an edge portion of the 2 nd accommodatingchamber wall surface 212b on therod accommodating cover 76 side, which will be described in detail later. Theexposure window 218 exposes the standingpost 210 in therod accommodating chamber 212.

Further, bolt holes 220 that are screwed with thebolts 77 described above are formed in the peripheral region of therod accommodating chamber 212 in theside wall surface 206, that is, in a region that is different from the region in which therod accommodating chamber 212 is formed and that is covered with therod accommodating cover 76. The number ofbolts 77 and bolt holes 220 is not particularly limited.

When thestand assembly 200 is viewed from the front end side thereof, the opposingwall surface 208 constitutes the left side surface of thestand accommodating chamber 94 a. A holdinghole opening 214a (see fig. 8) is formed in the opposingwall surface 208 as an opening on the standingbase 96 side of the holdinghole 214. Acutout 208a into which a part of the standingplatform 96 enters is formed in the opposingwall surface 208. Thenotch 208a is shaped so as not to interfere with the rotation of the standingplatform 96 around therotation axis 216.

[ Structure of standing table, standing table upright rod and rotation shaft ]

The standingplatform 96 is connected to one end side of the standing platform upright 210 via arotation shaft 216 which is divided into two structures, which will be described later. Specifically, in the present embodiment, therotation shaft 216 having a two-piece structure is coupled by thebolts 211, whereby thestand upright 210 and thestand 96 are coupled via the rotation shaft 216 (see fig. 7). Thereby, the standing upright 210 rotates (swings) integrally with the standing table 96 around therotation shaft 216. An operation wire 222 (see fig. 6) is connected to the other end side of theupright post 210.

Theoperation wire 222 has a front-end-side connection portion 222a (see fig. 6) connected to the stand upright 210 in therod accommodating chamber 212 at the front end side thereof. The proximal end of theoperation wire 222 is connected to a stand operation mechanism 226 (see fig. 10) in theoperation unit 22 through thewire insertion hole 224 in therod accommodation chamber 212 in theinsertion unit 20.

Fig. 10 is a schematic diagram showing an example of thestand operation mechanism 226. As shown in fig. 10, theoperation wire 222 has a base end side connecting portion 222b on the base end side thereof, which is connected to thestand operation mechanism 226. Thestand operating mechanism 226 includes an operatinglever 43 corresponding to an operating member of the present invention, arotary drum 226A to which the operatinglever 43 is coupled and which is rotatable within a predetermined angle range, acrank member 226B coupled to therotary drum 226A, and aslider 226C coupled to the crankmember 226B. The base end side connecting portion 222b is connected to theslider 226C.

When therotating drum 226A is rotated by operating theoperation lever 43, theoperation wire 222 is pushed and pulled through thecrank member 226B and theslider 226C, and thestand upright 210 swings, and thestand 96 rotates (swings) about therotation shaft 216 according to the swing of thestand upright 210.

Fig. 11 is an explanatory diagram for explaining the rotation of thestand 96 in accordance with the operation of theoperation lever 43. As shown in fig. 11, when therotating drum 226A is rotated in one direction by operating theoperation lever 43, theoperation wire 222 is pushed, and thestand upright 210 is rotated in the R1 direction about therotation shaft 216, so that thestand 96 is tilted. On the other hand, as indicated by reference numeral XIB, when theoperation lever 43 is operated to rotate therotary drum 226A in the opposite direction, theoperation wire 222 is pulled, and thestand upright 210 is rotated in the R2 direction opposite to the R1 direction about therotation shaft 216, so that thestand 96 is raised. In this way, theoperation wire 222 can displace (raise and fall) the raisingstage 96 by rotating therotation shaft 216 via the raising stage upright 210 by the operation of theoperation lever 43.

Fig. 12 is an external perspective view of the standing table 96. As shown in fig. 12, the surface of thestand 96 facing thecommunication hole 202a is anarcuate guide surface 96a for guiding the treatment instrument guided into thestand accommodating chamber 94a toward thetreatment instrument outlet 94. Astand rotating shaft 216a, which constitutes a part of therotating shaft 216 and corresponds to the 2 nd rotating shaft of the present invention, is coupled (including integrally formed) to the base end portion of thestand 96. The method of connecting thestand 96 and thestand rotation shaft 216a is not particularly limited, and thestand 96 and the stand rotation shaft may be formed separately from each other instead of integrally.

Thestand rotation shaft 216a is inserted into the holdinghole 214 from thestand accommodating chamber 94a side. As described above, one end of thestand rotation shaft 216a is connected to the base end of thestand 96, and the other end thereof has the connectingportion 230a corresponding to the 2 nd connecting portion of the present invention. Thecoupling portion 230a has an axial shape protruding toward thestand column 210 along the axial direction of therotary shaft 216.

Further, ascrew hole 232 that is screwed with the tip end portion of thebolt 211 shown in fig. 7 and the like described above is formed in thestand rotation shaft 216a (thecoupling portion 230 a). Further, a 1 stgroove wall surface 234a and agroove bottom surface 234b which constitute a part of a seal member mounting groove 234 (see fig. 15) described later are formed on the outer peripheral surface of the other end side of thestand rotation shaft 216a.

Fig. 13 is an external perspective view of thestand upright 210 viewed from the side of thelever housing cover 76. Fig. 14 is an external perspective view of thestand upright 210 as seen from thestand 96 side.

As shown in fig. 13 and 14, theupright post 210 has a postmain body portion 210a, a postbase end portion 210b, and a posttip end portion 210c. The side surface of theupright post 210 on the side opposite to the rod storage cover 76 (the side opposite to the rotation axis side of the present invention) is referred to as a 1 strod side surface 246. In the 1 strod side surface 246, the side surface of the rodmain body 210a is the mainbody side surface 246a. The side surface of theupright post 210 on the opposite side (the rotation axis side of the present invention) from the 1 stpole side surface 246 is the 2 ndpole side surface 248.

Thelever base end 210b is provided on one end side of thelever body 210 a. Apole shaft 216b, which constitutes a part of theshaft 216 and corresponds to the 1 st rotation shaft of the present invention, is connected to thepole base end 210 b. The method of connecting therod rotation shaft 216b and therod base end 210b is not particularly limited, and the two may be formed separately from each other instead of integrally.

The leverdistal end portion 210c is provided on the other end side of the levermain body portion 210a, and has awire connecting portion 235. The distal endside connecting portion 222a of theoperation wire 222 described above is connected to thewire connecting portion 235.

Therod rotation shaft 216b is inserted into the holdinghole 214 from therod accommodation chamber 212 side. As described above, one end of thepole rotation shaft 216b is connected to thepole base end 210b of thestand pole 210. At this time, as shown in fig. 17 described later, when thestand assembly 200 is viewed from the front end side thereof, thestand rotation shaft 216b is provided at a position that is pulled toward thestand 96 side (the 2 nd direction DR side in fig. 17 described later) than thestand 210. As described above with reference to fig. 29, even if the length of theupright post 210 is increased to improve the upright performance, thepost rotation shaft 216b is less likely to interfere with the inner peripheral surface of thedistal end portion 50, and therefore, the diameter of thedistal end portion 50 can be prevented from increasing (see fig. 17). That is, the diameter of thedistal end portion 50 can be reduced.

The other end of the uprightrotary shaft 216b has acoupling portion 230b corresponding to the 1 st coupling portion of the present invention. Thecoupling portion 230b is provided on the end surface of the other end side of the uprightrotary shaft 216b (the surface facing the uprightrotary shaft 216 a), and is a fitting hole into which thecoupling portion 230a described above is fitted.

Further, theupright rotation shaft 216b is formed with aninsertion hole 236 through which thebolt 211 shown in fig. 7 and the like described above is inserted. The end surface of the other end of therod rotation shaft 216b and the outer peripheral portion of thecoupling portion 230b function as a 2 ndgroove wall surface 234c that forms a part of a seal member mounting groove 234 (see fig. 15) described later.

Fig. 15 is an explanatory diagram for explaining a connection state of thestand rotation shaft 216a and theupright rotation shaft 216 b. As shown in fig. 12 to 15, theconnection portion 230a of thestand rotation shaft 216a and theconnection portion 230b of thepole rotation shaft 216b are connected to each other in the holdinghole 214 shown in fig. 7 and the like, which have been described above. At this time, thecoupling parts 230a and 230b have a shape in which thestand rotation shaft 216a and theupright rotation shaft 216b are coupled so as not to rotate relative to each other. The shape of the connectingportions 230a and 230b is not limited to the shape shown in the drawings, and may be changed as appropriate.

Thebolt 211 is inserted into theinsertion hole 236 from one end side of theupright rotation shaft 216b in a state where the connectingportions 230a and 230b are connected, and then is screwed into thescrew hole 232 of theupright rotation shaft 216 a. Thus, the standingplatform 96, the standingplatform upright 210, and therotation shaft 216 are integrated. As a result, thestand 96 and thestand upright 210 integrally rotate (swing) about the rotation shaft 216 (thestand rotation shaft 216a and theupright rotation shaft 216 b).

By connecting thestand rotation shaft 216a and thepole rotation shaft 216b, an annular sealmember mounting groove 234 is formed in the outer peripheral surface of therotation shaft 216 along the circumferential direction thereof by the 1 stgroove wall surface 234a, thegroove bottom surface 234b, and the 2 ndgroove wall surface 234 c. In other words, therotation shaft 216 is divided into thestand rotation shaft 216a and thepole rotation shaft 216b with the 2 ndgroove wall surface 234c on the 1 st direction DL side (corresponding to the stand pole side of the present invention with reference to fig. 17) of the sealmember mounting groove 234 as a boundary. A seal member 256 (see fig. 17) to be described later is attached to the sealmember attachment groove 234.

[ Structure of rod storage cover ]

Fig. 16 is an explanatory view for explaining theexposure window 218 of therod accommodation chamber 212 and therod accommodation cover 76. As shown in fig. 16, thestand upright 210 rotates (swings) about therotation shaft 216 in therod accommodating chamber 212. Accordingly, theexposure window 218 has a shape that exposes a rotation range of the standingpost 210 that rotates around therotation shaft 216. Accordingly, theexposure window 218 can expose the 1 stpole side surface 246 of thestand pole 210 at each rotational position of thestand pole 210.

Thelever housing cover 76 is fitted into thefitting hole 75 of thehousing member 72 to cover at least theexposure window 218 of thelever housing chamber 212. Therod storage cover 76 removably covers the exposure window 218 (rod storage chamber 212) by screwing thebolt 77 into thebolt hole 220 of thestand assembly 200 or removing thebolt 77 from thebolt hole 220 through theinsertion hole 76 b. In this way, even in theultrasonic endoscope 10 in which thedistal end portion 50 is configured as a detachable cover, such as a side-view endoscope (e.g., a duodenoscope), the exposure window 218 (the rod accommodating chamber 212) can be exposed by detaching therod accommodating cover 76 from thestand assembly 200. As a result, thestand bar 210 of theultrasonic endoscope 10 and a sealing member 256 (see fig. 17) described later can be replaced or cleaned easily.

In the present embodiment, thelever housing cover 76 is attached to the stand assembly 200 (thefitting hole 75 of the housing member 72) using thebolt 77, but an attachment method other than thebolt 77 may be employed.

Thecap seal member 76a corresponds to the cap airtight holding member of the present invention, and is formed of an elastic material such as rubber, for example. Thecover sealing member 76a is provided along an edge portion of the cover inner surface 244 (see fig. 17) of thelever housing cover 76, for example, and has a substantially frame shape. When thelever receiving cover 76 is attached to thestand assembly 200, thecover sealing member 76a is pressed against the side wall surface 206 (the peripheral edge portion of the exposure window 218) of thestand assembly 200. Thereby, the airtight seal between therod storing cover 76 and the exposure window 218 (rod storing chamber 212) can be maintained.

The position where thelid sealing member 76a is provided on the lid inner surface 244 (see fig. 17) and the shape of thelid sealing member 76a are not particularly limited as long as the airtight seal between thelever housing lid 76 and theexposure window 218 can be maintained. Further, instead of providing thelid sealing member 76a on the lidinner surface 244, a lid airtight holding member such as thelid sealing member 76a may be provided on theside wall surface 206 of thestand assembly 200, or a sealing material (lid airtight holding member) may be applied to the joint surface of therod storage lid 76 and thestand assembly 200.

[ Structure of restriction 1 and restriction 2 ]

Fig. 17 is a cross-sectional view of the standingplatform 96, the standingplatform upright 210, and therotation shaft 216 inserted through the holdinghole 214. In fig. 17, theoperation line 222 is not illustrated. In the drawing, the direction from thestand 96 toward thestand upright 210 is referred to as the 1 st direction DL, and the direction opposite to the 1 st direction DL is referred to as the 2 nd direction DR, among directions parallel to the axial direction of therotary shaft 216.

As shown in fig. 17, a gap is secured between the two side surfaces of the standing table 96 on the 1 st DL side and the 2 nd DR side and the inner wall surface (the opposingwall surface 208 and the like in fig. 8) of the standingtable accommodating chamber 94a opposing the two side surfaces, respectively. This can improve the cleaning performance such as the inflow of the cleaning liquid and the like, the insertion performance and the dewatering performance of the cleaning brush, and the easiness of the cleaning work. As described above, in the present embodiment, since a gap is secured between both side surfaces of thestand 96 and the inner wall surface of thestand accommodating chamber 94a, the displacement in the 1 st direction DL and the displacement in the 2 nd direction DR of thestand 96, thestand upright 210, and the rotation shaft 216 (hereinafter, simply referred to as thestand upright 210 and the like) are restricted.

Specifically, in the present embodiment, the 1st restriction portion 250 provided on the lidinner surface 244 of therod storage lid 76 restricts the displacement of the 1 st direction DL of thestand upright 210 and the like, and the 2nd restriction portion 252 provided on the 1 st housingchamber wall surface 212a of therod housing chamber 212 restricts the displacement of the 2 nd direction DR of thestand upright 210 and the like.

Fig. 18 is an enlarged view of the coverinner surface 244 of thelever receiving cover 76. As shown in fig. 18 and fig. 17 described above, the 1st regulating portion 250 is provided in the coverinner surface 244 at a position facing the mainbody side surface 246a of the levermain body 210a of thestand upright 210.

The 1st restriction portion 250 may be formed of the same material as thelever receiving cover 76, or may be formed of a different material (an elastic material, a low friction material, or the like). For example, the 1st restriction portion 250 has a shape protruding from the lidinner surface 244 in the 2 nd direction DR when viewed from the front end side of the stand assembly 200 (see fig. 17). Specifically, when thepole housing cover 76 is attached to thestand assembly 200, the 1st regulating portion 250 is adjusted to a projecting amount that is close to or in contact with the main bodyportion side surface 246a of thestand upright 210 in thepole housing chamber 212.

For example, when the lidinner surface 244 of thepole housing lid 76 is viewed from the front side (see fig. 18), the 1st restriction portion 250 has a shape of a trajectory of a rotation along at least a part of the mainbody side surface 246a of theupright post 210 that rotates in the above-described R1 direction and R2 direction (see fig. 11) around therotation axis 216. Thus, the 1st restriction portion 250 approaches or abuts against the main bodyportion side surface 246a of theupright post 210 at each rotational position of theupright post 210 that rotates about therotational axis 216.

In this way, the 1st restriction portion 250 is interposed between the main bodyportion side surface 246a and the coverinner surface 244 at each rotational position of thestand upright 210, and can restrict the displacement of thestand upright 210 or the like in the 1 st direction DL (displacement toward therod storage cover 76 side).

Fig. 19 is an enlarged view of therod tip 210c (wire connecting portion 235) and thewire insertion hole 224 in fig. 17. As shown in fig. 19, when thewire insertion hole 224 opened in the 2 nd housingchamber wall surface 212b is viewed from the front end side (front face of the front end side) of theriser assembly 200, the formation position of thewire insertion hole 224 in the 2 nd housingchamber wall surface 212b is adjusted so that the center position CH of thewire insertion hole 224 is displaced to the 2 nd direction DR side (riser side of the present invention) than the position of the rodfront end portion 210c shown by the straight line LT in the drawing.

In this case, when the tip-side connecting portion 222a (see fig. 11, etc.) of theoperation wire 222 is connected to thewire connecting portion 235 of thelever tip portion 210c, a force in the 2 nd direction DR is applied from theoperation wire 222 to thelever tip portion 210c in the axial direction of therotation shaft 216. As a result, the displacement of theupright post 210 or the like in the 1 st direction DL can be more reliably restricted. When thewire insertion hole 224 is viewed from the front end side of thestand assembly 200, the center position CH may be the same position as the position of the rodfront end portion 210c in the axial direction of therotation shaft 216.

Returning to fig. 17, the 2nd regulating portion 252 is provided in the 1 st housingchamber wall surface 212a of therod housing chamber 212 at a position facing the 2 ndrod side surface 248 of the stand upright 210 (the rodmain body portion 210 a). The 2nd restriction portion 252 may be formed of the same material as thepartition wall 204, or may be formed of a different material (an elastic material, a low friction material, or the like).

For example, the 2nd restricting portion 252 has a shape protruding from the 1 st housingchamber wall surface 212a in the 1 st direction DL when viewed from the front end side of theriser block 200. Specifically, the 2nd regulating portion 252 is adjusted to a projecting amount that is close to or in contact with the standing post 210 (the postmain body portion 210 a) in thepost accommodating chamber 212.

Although not shown, when the 1 st housingchamber wall surface 212a is viewed from the front side, the 2nd restricting portion 252 has a shape of a trajectory along at least a part of the 2 ndrod side surface 248 of theupright post 210 rotating about therotation axis 216. As a result, the 2nd regulating portion 252 is also brought close to or brought into contact with the upright post 210 (the mainbody side surface 246 a) at each rotational position of theupright post 210 that rotates about therotation axis 216.

In this way, the 2nd restricting portion 252 is interposed between the 2 ndpole side surface 248 and the 1 st housingchamber wall surface 212a at each rotational position of thestand pole 210, and thus can restrict the displacement of thestand pole 210 and the like in the 2 nd direction DR.

[ Structure of sealing Member ]

Fig. 20 is an enlarged view of therotary shaft 216 and theseal member 256 in fig. 17. As shown in fig. 20 and fig. 17 described above, an annular sealmember mounting groove 234 is formed in the outer peripheral surface of therotary shaft 216, and is composed of a 1 stgroove wall surface 234a, agroove bottom surface 234b, and a 2 ndgroove wall surface 234 c. The sealmember mounting groove 234 is formed so as to extend from a position closer to the 1 st direction DL side (the standing upright side of the present invention) than the holdinghole opening 214a of the holdinghole 214 described above to a position closer to the 2 nd direction DR side (the standing upright side of the present invention) than the holdinghole opening 214a in a state where the standing upright 210 and the like are restricted by the 1st restricting portion 250 and the 2nd restricting portion 252. That is, the sealmember mounting groove 234 is located partially inside the holdinghole 214 in the axial direction of therotary shaft 216, and the rest is located outside the holdinghole 214. Further, anannular seal member 256 is fitted to the sealmember mounting groove 234.

Theseal member 256 is inserted through therotary shaft 216, and maintains the airtight seal between the outer peripheral surface of therotary shaft 216 and the inner wall surface of the holdinghole 214. The end portion of the sealingmember 256 on the 2 nd direction DR side is exposed (protrudes) from the holdinghole opening 214a of the holdinghole 214 to the 2 nd direction DR side. Therefore, even when a liquid such as blood or water (hereinafter, simply referred to as a liquid) enters the standing-table accommodating chamber 94a, the sealingmember 256 prevents the liquid from entering between the outer peripheral surface of therotary shaft 216 and the inner wall surface of the holdinghole 214.

Theseal member 256 has a so-called oil seal structure, and includes a 1st wall portion 256a, a 2nd wall portion 256b, a 3rd wall portion 256c, and acompression spring 256d, each of which is formed in a ring shape. The 1st wall portion 256a, the 2nd wall portion 256b, and the 3rd wall portion 256c are integrally formed of, for example, a resin material having a low friction coefficient.

Although not shown, the 1st wall 256a has a well-known lip (for example, a dust lip, a lip tip end portion, and a seal lip) that is in close contact with thegroove bottom surface 234b of the sealmember mounting groove 234. The 2nd wall portion 256b is a well-known back face and is in close contact with the 1st wall surface 234a of the sealmember mounting groove 234. The 3rd wall portion 256c is a well-known fitting portion having a close contact area U1 that is in close contact with the inner wall surface of the holdinghole 214 and an exposed area U2 that is located closer to the 2 nd direction DR side (i.e., in the standingtable accommodating chamber 94 a) than the holdinghole opening 214a of the holdinghole 214.

Thecompression spring 256d is disposed between the 1st wall portion 256a and the 3rd wall portion 256 c. Thecompression spring 256d is a biasing member that biases one of the 1st wall portion 256a and the 3rd wall portion 256c in a direction away from the other. Accordingly, the 1st wall portion 256a can be pressure-bonded to thegroove bottom surface 234b, and the 3rd wall portion 256c can be pressure-bonded to the inner wall surface of the holdinghole 214, so that the sealing function of the sealingmember 256 can be improved. In addition, a biasing member other than thecompression spring 256d may be used, or an elastic member such as rubber may be used instead of the biasing member.

Fig. 21 is an enlarged view of the 1st wall portion 256a of theseal member 256. Note that reference sign XXIA in fig. 21 indicates a state before thestand rotation shaft 216a and theupright rotation shaft 216b are coupled, and reference sign XXIB in fig. 21 indicates a state after thestand rotation shaft 216a and theupright rotation shaft 216b are coupled.

As shown by reference sign XXIA in fig. 21, in the axial direction of therotation shaft 216, the width W1 of the 1st wall portion 256a is formed longer than the width W2 of thegroove bottom surface 234b of the sealmember mounting groove 234. Therefore, as shown by reference sign XXIB in fig. 21, after thestand rotation shaft 216a and theupright rotation shaft 216b are coupled, theseal member 256 is mounted in the sealmember mounting groove 234 in a state in which the 1st wall portion 256a thereof is compressed in the axial direction of therotation shaft 216. Accordingly, the 2nd wall portion 256b of theseal member 256 is pressed against the 1st wall surface 234a of the sealmember mounting groove 234 by the elastic restoring force of the 1st wall portion 256 a. As a result, the sealing function of the sealingmember 256 can be improved.

The 3rd wall portion 256c of theseal member 256 has higher durability (higher rigidity) than the 1st wall portion 256a and the 2nd wall portion 256 b. Therefore, by rotating theseal member 256 integrally with therotation shaft 216, even if the 3rd wall portion 256c is in sliding contact with the inner wall surface of the holding hole 214 (particularly, the edge portion of the holding hole opening 214 a), breakage and degradation of the 3rd wall portion 256c can be prevented. That is, in general O-rings, seals, and the like, if stress is applied by sliding contact with the inner wall surface of the holdinghole 214, there is a possibility that the sealingmember 256 will be cut or twisted, but such a problem can be suppressed. In addition, the 3rd wall 256c may be formed to have a width in the axial direction of therotation shaft 216 longer than the width W2 of thegroove bottom surface 234b, similarly to the 1st wall 256 a.

In addition, in the cleaning process of theseal member 256, the portion of the 2nd wall portion 256b exposed in thestand accommodating chamber 94a and the exposed region U2 of the 3rd wall portion 256c may be easily flown in with the cleaning liquid or the like, and the portion of the cleaning brush may be easily contacted with the cleaning liquid, so that the cleaning performance and the ease of the cleaning operation may be improved.

[ Effect of the present embodiment ]

As described above, in theultrasonic endoscope 10 of the present embodiment, the 1st restriction portion 250 is provided on the coverinner surface 244 of theshaft housing cover 76 so as to be interposed between the main bodyportion side surface 246a and the coverinner surface 244 at each rotational position of thestand bar 210. Thus, even when the length of thestand upright 210 is increased to improve the raising performance, the displacement of thestand upright 210 or the like in the 1 st direction DL can be restricted by the 1st restricting portion 250 without making thedistal end portion 50 larger in diameter as shown in fig. 29 described above. As a result, the displacement of thestand bar 210 and the like in the 1 st direction DL can be restricted, and the stand performance of thestand bar 210 can be improved, and the diameter of thedistal end portion 50 can be reduced.

In the present embodiment, the 2nd restricting portion 252 is provided on the 1 st housingchamber wall surface 212a of therod housing chamber 212, so that the displacement of thestand upright 210 or the like in the 2 nd direction DR can be restricted. Therefore, even when gaps are secured between the inner wall surfaces of the erectiontable accommodating chamber 94a and the both side surfaces of the 1 st and 2 nd directions DL and DR of the erection table 96 in order to improve the cleaning performance and the cleaning easiness in the erectiontable accommodating chamber 94a, theerection table pole 210 and the like can be prevented from being displaced in the axial direction of therotation shaft 216.

In the present embodiment, theseal member 256 having a structure capable of being brought into close contact (pressure-contact) with the 1 stgroove wall surface 234a and thegroove bottom surface 234b of the sealmember mounting groove 234 and the inner wall surface of the holdinghole 214 is mounted to the sealmember mounting groove 234, so that the airtight seal between the outer peripheral surface of therotary shaft 216 and the inner wall surface of the holdinghole 214 can be reliably maintained.

[ modification of the 1 st restriction portion and the 2 nd restriction portion ]

Fig. 22 is an explanatory diagram for explaining a modification of the 1st restriction portion 250 and the 2nd restriction portion 252. In the above embodiment, the 1st restriction portion 250 is provided on the lidinner surface 244 of thelever accommodation lid 76, and the 2nd restriction portion 252 is provided on the 1 st accommodationchamber wall surface 212a of thelever accommodation chamber 212.

In contrast, as shown in fig. 22, the 1st restriction portion 250 may be provided on the mainbody side surface 246a of thestand upright 210. In this case, the 1st restriction portion 250 is adjusted to a protruding amount close to or abutting against the coverinner surface 244. Therefore, the 1st restriction portion 250 is interposed between the main bodyportion side surface 246a and the coverinner surface 244 at each rotational position of thestand bar 210 that rotates about therotation axis 216, as in the above embodiment, and therefore, displacement of thestand bar 210 and the like in the 1 st direction DL can be restricted.

The 2nd restricting portion 252 may be provided on the 2 ndpole side surface 248 of theupright pole 210. In this case, the 2nd restriction portion 252 is adjusted to a protruding amount that is close to or in contact with the 1 st accommodationchamber wall surface 212a of therod accommodation chamber 212. Therefore, as in the above embodiment, the 2nd restricting portion 252 is interposed between the 2 ndpole side surface 248 and the 1 st housingchamber wall surface 212a at each rotational position of thestand pole 210 rotating around therotation axis 216, and therefore, displacement of thestand pole 210 and the like in the 2 nd direction DR can be restricted.

Although not shown, one of the 1st restriction portions 250 may be provided on the lidinner surface 244 and the other may be provided on the bodyportion side surface 246a by dividing the 1st restriction portion 250 into two along the axial direction of therotation shaft 216. Then, by adjusting the positions of both sides and the like so that one of the 1st restriction portions 250, which are divided into two, is brought into close proximity to or in contact with the other at each rotational position of thestand upright 210, displacement of thestand upright 210 and the like in the 1 st direction DL can be restricted.

Similarly, the 2nd restriction portion 252 may be divided into two in the axial direction of therotation shaft 216, one of the 2nd restriction portions 252 divided into two may be provided on the 1 st housingchamber wall surface 212a, and the other may be provided on the 2 ndrod side surface 248. Then, by adjusting the positions of both sides and the like so that one of the two-divided 2nd restricting portions 252 is brought into close proximity to or in contact with the other at each rotational position of thestand upright 210, the displacement of thestand upright 210 and the like in the 2 nd direction DR can be restricted.

Modification 1 of sealing Member

Fig. 23 is a cross-sectional view of aseal member 260 of modification 1, which is different from theseal member 256 of the above embodiment. In the above embodiment, theseal member 256 is disposed between the outer peripheral surface of therotation shaft 216 and the inner wall surface of the holdinghole 214, but anannular seal member 260 may be disposed between thepartition wall 204 and the risingstage 96.

As shown in fig. 23, when theseal member 260 is disposed between thepartition wall 204 and the standing table 96, instead of forming the sealmember mounting groove 234 on the outer peripheral surface of therotary shaft 216, one end of the rotary shaft 216 (standing tablerotary shaft 216 a) on the 2 nd direction DR side is extended to a position farther in the 2 nd direction DR than the holdinghole opening 214a of the holdinghole 214. Thus, a space in which theseal member 260 can be disposed can be formed between the opposingwall surface 208 of thepartition wall 204 and the standingplatform 96.

Theseal member 260 has aninsertion hole 262 through which therotation shaft 216 is inserted. The diameter of theinsertion hole 262 is formed larger than the diameter of therotation shaft 216. Theseal member 260 has a so-called oil seal structure, and includes a 4th wall portion 260a, a 5th wall portion 260b, a 6th wall portion 260c, and acompression spring 260d, each of which is formed in a ring shape. The 4th wall 260a, the 5th wall 260b, and the 6th wall 260c are integrated.

The 4th wall 260a is one of a well-known lip and a fitting portion, and is in close contact with the opposingwall surface 208 of thepartition 204. The 5th wall 260b is the other of the well-known lip and the fitting portion, and is in close contact with the 1 st direction DL side surface (the side surface connected to the rotation shaft 216) of the standing table 96. The 6th wall 260c is a well-known back surface, and forms an outer peripheral surface of theseal member 260.

Thecompression spring 260d is disposed between the 4th wall portion 260a and the 5th wall portion 260 b. Thecompression spring 260d is a biasing member that biases one of the 4th wall 260a and the 5th wall 260b in a direction away from the other. This allows the 4th wall 260a to be in pressure contact with the opposingwall 208, and the 5th wall 260b to be in pressure contact with the 1 st DL side surface of thestand 96. As a result, the sealingmember 260 can prevent liquid from entering between the outer peripheral surface of therotary shaft 216 and the inner wall surface of the holdinghole 214, similarly to the sealingmember 256 of the above embodiment. In addition, a biasing member other than thecompression spring 260d may be used, or an elastic member such as rubber may be used instead of the biasing member.

Modification 2 of the sealing Member

Fig. 24 is a cross-sectional view of an O-ring 270 ofmodification 2, which is different from theseal member 256 of the above embodiment. Fig. 25 is an enlarged view of the O-ring 270 of fig. 24. In the above embodiment, theseal member 256 is used as the seal member of the present invention, and theseal member 256 is exposed from the holdinghole opening 214a to the 2 nd direction DR side.

On the other hand, as shown in fig. 24 and 25, an annular O-ring 270 may be provided between the outer peripheral surface of therotary shaft 216 and the inner wall surface of the holdinghole 214 and on the 1 st direction DL side of the holdinghole opening 214a (refer to a straight line LH in fig. 24).

In this case, the seal member attachment groove 234 (the 1 stgroove wall surface 234a, thegroove bottom surface 234b, and the 2 ndgroove wall surface 234 c) is formed on the outer peripheral surface of therotary shaft 216 at a position closer to the 1 st direction DL side (the standing stand upright side of the present invention) than the holding hole opening 214 a. Anannular wall portion 272, which is an annular wall portion of the 1 stgroove wall surface 234a constituting the 2 nd direction DR side (the standing table side of the present invention) of the sealmember mounting groove 234, is formed along the circumferential direction of the outer peripheral surface of the rotary shaft 216 (the standing tablerotary shaft 216 a).

The O-ring 270 corresponds to the sealing member of the present invention, and is disposed between the outer peripheral surface of therotary shaft 216 and the inner wall surface of the holdinghole 214 by being attached to the sealingmember attachment groove 234. By this O-ring 270, the airtight seal between the outer peripheral surface of therotary shaft 216 and the inner wall surface of the holdinghole 214 can be maintained.

Fig. 26 is a cross-sectional view ofannular wall portion 272 taken along line 26-26 in fig. 25. As shown in fig. 26 and fig. 25 described above, theannular wall portion 272 has a shape that covers a part of theseal side surface 270a facing the 1 stgroove wall surface 234a of the outer surface of the O-ring 270. In other words, theannular wall portion 272 has a shape such that another portion (except a part) of theseal side surface 270a is exposed into the standingplatform accommodating chamber 94a through the holding hole opening 214 a.

Specifically, a plurality of D-cuts 272a (corresponding to the cut portions of the present invention) parallel to the axial direction of therotary shaft 216 are formed on the outer peripheral surface of theannular wall portion 272 at equal angular intervals with respect to the center of therotary shaft 216. Thereby, agap 274 is formed between the inner wall surface of the holdinghole 214 and the D-cut 272a of theannular wall portion 272. As a result, during the cleaning process of theultrasonic endoscope 10, the cleaning brush can be brought into contact with the O-ring 270 through thegap 274, or the cleaning liquid or the like can be flowed into the O-ring 270. As a result, the cleaning performance of theseal side surface 270a of the O-ring 270 is improved, and the cleaning work can be easily performed.

In fig. 26, 8D-cuts 272a are formed in the outer peripheral surface of theannular wall 272 so that the cross-sectional shape of the outer peripheral surface of theannular wall 272, more specifically, the cross-sectional shape of the surface perpendicular to the axial direction of therotary shaft 216 is octagonal, but the number of D-cuts 272a formed in the outer peripheral surface of theannular wall 272 may be 7 or less or 9 or more. The cross-sectional shape of the outer peripheral surface of theannular wall portion 272 may be formed in an arbitrary polygonal shape (the number of D-cuts 272a is 3 or more).

Fig. 27 is a cross-sectional view of a modification of theannular wall portion 272 shown in fig. 26. As shown in fig. 27, instead of forming the D-cut 272a, the outer peripheral surface of theannular wall 272 may be formed to have a smaller diameter than therotary shaft 216. For example, the outer peripheral surface of theannular wall portion 272 is formed to be lower Δr=0.1 mm over the entire circumference thereof with respect to the outer peripheral surface of therotary shaft 216. Even in this case, since thegap 274 is formed between the inner wall surface of the holdinghole 214 and the outer peripheral surface of theannular wall portion 272, the cleaning performance of theseal side surface 270a of the O-ring 270 is improved, and the cleaning work can be easily performed.

Further, the outer peripheral surface of theannular wall portion 272 may be formed in any shape as long as agap 274 can be formed between the inner wall surface of the holdinghole 214 and the outer peripheral surface of theannular wall portion 272.

[ others ]

In the above embodiments, the sealingmembers 256 and 260 and the O-ring 270 are described as the sealing member of the present invention, but the kind, shape, arrangement position, and the like of the sealing member are not particularly limited as long as the airtightness between the outer peripheral surface of therotary shaft 216 and the inner wall surface of the holdinghole 214 can be ensured.

In the above embodiment, therotation shaft 216 has a structure divided into two parts, i.e., thestand rotation shaft 216a and theupright rotation shaft 216b, but may be, for example, a non-divided structure as shown in fig. 29 described above.

In the above-described embodiment, the 1st restriction portion 250 is provided on the lidinner surface 244 of thelever housing lid 76 that forms a part of the outer peripheral surface of thetip portion 50, but the 1st restriction portion 250 may be provided on the inner lid of the double lid as shown in fig. 29 described above.

In the above embodiment, theultrasonic endoscope 10 has been described as an example, but the present invention can also be applied to an endoscope provided with astand 96 for guiding a treatment tool, for example, a side view endoscope such as a duodenoscope.

[ appendix ]

As can be understood from the description of the embodiments described in detail above, the present specification includes disclosure of various technical ideas including the inventions shown below.

Fig. 28 is an explanatory view of a 1st restriction portion 254 of another embodiment provided on the coverinner surface 244 of thelever receiving cover 76. As shown in fig. 28, the 1st regulating portion 254 is provided on the coverinner surface 244 of thelever housing cover 76 at a position facing the rotation shaft 216 (theupright rotation shaft 216 b). When thepole housing cover 76 is attached to thestand assembly 200, the 1st regulating portion 254 is adjusted to a projecting amount that is close to or in contact with the 1 st direction DL-side end portion of the rotation shaft 216 (thepole rotation shaft 216 b). Accordingly, since the 1st regulating portion 254 is interposed between therotation shaft 216 and the coverinner surface 244 at each rotation position of thestand bar 210, the displacement of thestand bar 210 and the like in the 1 st direction DL can be regulated as in the above-described embodiment.

Symbol description

2-ultrasonic inspection system, 10-ultrasonic endoscope, 12-ultrasonic processor device, 14-ultrasonic processor device, 16-light source device, 18-monitor, 20-insertion portion, 22-operation portion, 24-universal cord, 27-ultrasonic connector, 28-connector for endoscope, 30-connector for light source, 32-hose, 34-hose, 36-air supply and water supply button, 38-suction button, 42-angle button, 43-operation lever, 44-treatment instrument insertion port, 50-front end portion, 52-bending portion, 54-soft portion, 60-ultrasonic observation portion, 62-ultrasonic transducer, 64-balloon, 66-locking ring, 68-locking groove, 70 a-supply and discharge port, 72-housing member, 72 a-1 st housing member, 72 b-2 nd housing member, 73-partition wall, 74-groove portion, 75-fitting hole, 76-stem receiving cover, 76 a-cap sealing member, 76 b-insertion hole, 77-bolt, 77 b-insertion hole, 80-endoscopic observation portion, 86-slope portion, 88-observation window, 90-illumination window, 92-air supply and water supply nozzle, 94-treatment instrument outlet port, 94 a-stand accommodating chamber, 96-stand, 96 a-guide surface, 100-treatment instrument channel, 102-air supply line, 104-balloon line, 106-suction line, 108-air supply line, 110-water supply line, 112-balloon supply line, 114-balloon drain line, 116-air supply line, 118-water supply tank, 120-water supply line, 122-branching line, 124-suction pump, 126-suction source line, 128-light guide, 129-air supply pump, 200-stand assembly, 202-base, 202 a-communication hole, 204-partition, 206-side wall, 208-opposite wall, 208 a-notch, 210-stand pole, 210 a-pole body, 210B-pole base end, 210C-pole front end, 211-bolt, 212-pole housing chamber, 212 a-1 st housing chamber wall, 212B-2 nd housing chamber wall, 214-holding hole, 214 a-holding hole opening, 216-rotation axis, 216A-stand rotation axis, 216B-pole rotation axis, 218-exposed window, 220-bolt hole, 222-operating wire, 222 a-front end side coupling portion, 222B-base end side coupling portion, 224-wire insertion hole, 226-stand operating mechanism, 226A-rotating drum, 226B-crank member, 226C-slider, 230 a-coupling portion, 230B-coupling portion, 232-threaded hole, 234-seal member installation groove, 234 a-1 st groove wall surface, 234B-groove bottom surface, 234C-2 nd groove wall surface, 235-wire coupling portion, 236-insertion hole, 244-cover inner surface, 246-1 st rod side surface, 246A-main body portion side surface, 248-2 nd rod side surface, 250-1 st restriction portion, 252-2 nd restriction portion, 254-1 st restriction portion, 256-seal member, 256A-1 st wall portion, 256 b-2 nd wall portion, 256 c-3 rd wall portion, 256D-compression spring, 260-seal member, 260 a-4 th wall portion, 260 b-5 th wall portion, 260 c-6 th wall portion, 260D-compression spring, 262-insertion hole, 270-O-ring, 270 a-seal side surface, 272-annular wall portion, 272a-D cutout, 274-gap, 502-front end portion, 506-rotation shaft, 506A-shaft center, 510-stand upright, 514-rod housing chamber, 516-metal cover, 518-resin cover, 520-seal member, CH-center position, DL-1 direction, DR-2 nd direction, U1-close contact area, U2-exposed area.

Claims (18)

1. An endoscope, comprising:

an insertion portion having a front end and a base end;

an operation section provided on a base end side of the insertion section and having an operation member;

a stand assembly provided on the front end side of the insertion portion;

a rotation shaft rotatably supported by the stand assembly;

a stand coupled to one end of the rotation shaft and guiding a treatment tool guided from the stand assembly;

a stand upright including a rod main body portion, a rod base end portion provided on one end side of the rod main body portion and connected to the other end of the rotation shaft, and a rod tip portion provided on the other end side of the rod main body portion;

a rod accommodating chamber provided in the standing table assembly, for accommodating the standing table upright rod rotatably about the rotation axis, and having an exposure window for exposing a 1 st rod side surface of the standing table upright rod on a side opposite to the rotation axis side;

an operation wire having a base end side connecting portion connected to the operation member and a tip end side connecting portion connected to the rod tip end portion of the stand upright, and causing the rotation shaft to rotate via the stand upright by an operation of the operation member to raise the stand;

A partition wall that is a part of the standing table assembly, is provided between the rod accommodation chamber and the standing table, and has a holding hole that axially supports the rotation shaft, and a 1 st accommodation chamber wall surface that forms a bottom surface of the rod accommodation chamber on the standing table side and that opens the holding hole;

an annular seal member through which the rotary shaft is inserted and which maintains air tightness between an outer peripheral surface of the rotary shaft and an inner wall surface of the holding hole;

a cover detachably covering the exposure window, wherein a gap is arranged between an inner surface of the cover on the upright post side of the stand and the 1 st post side surface;

a 1 st regulating portion protruding from at least one of a main body side surface, which is a side surface of the lever main body, and the cover inner surface, of the 1 st lever side surface, the regulating portion being interposed between the main body side surface and the cover inner surface to regulate displacement of the stand upright in a 1 st direction of the cover side in a direction parallel to an axis of the rotary shaft;

a 2 nd restricting portion provided on at least one of a 2 nd pole side surface of the rotating shaft side of the upright pole and the 1 st housing chamber wall surface, interposed between the 2 nd pole side surface and the 1 st housing chamber wall surface, and restricting displacement of the upright pole in a 2 nd direction on a side opposite to the 1 st direction; and

And a standing table accommodating chamber which is a space for accommodating the standing table, wherein a gap is formed between an inner wall surface of the standing table accommodating chamber and both side surfaces of the 1 st direction side and the 2 nd direction side of the standing table which are respectively opposed to the inner wall surface.

2. The endoscope of claim 1, wherein,

the exposure window exposes a rotation range of the standing platform upright rod rotating around the rotation shaft in the rod accommodating chamber.

3. The endoscope according to claim 1 or 2, wherein,

when the 1 st restriction portion is provided on the lid inner surface, the 1 st restriction portion has a shape along a rotation locus of at least a part of the main body portion side surface of the stand upright rotated about the rotation axis, and is interposed between the main body portion side surface and the lid inner surface at each rotation position of the stand upright.

4. The endoscope according to claim 1 or 2, wherein,

the partition wall has a 2 nd housing chamber wall surface constituting a side surface of the lever housing chamber and formed with a wire insertion hole through which the operation wire is inserted,

when the wire insertion hole is seen from the front end side of the stand assembly, the center position of the wire insertion hole is displaced toward the stand side from the rod front end portion.

5. The endoscope according to claim 1 or 2, wherein,

the seal member is disposed between an inner wall surface of the holding hole and an outer peripheral surface of the rotary shaft, and a part of the seal member is exposed from a holding hole opening on the standing table side of the holding hole.

6. The endoscope of claim 5, wherein,

an annular seal member mounting groove is formed on the outer peripheral surface of the rotary shaft so as to extend from a position closer to the upright post than the holding hole opening to a position closer to the upright post than the holding hole opening,

the sealing member includes:

a 1 st wall portion which is in close contact with a groove bottom surface of the seal member mounting groove;

a 2 nd wall portion that is in close contact with a 1 st wall surface of the seal member mounting groove on the stand side; and

And a 3 rd wall portion having a close contact area in close contact with the inner wall surface of the holding hole and an exposed area located closer to the standing table than the holding hole opening.

7. The endoscope of claim 6, wherein,

the seal member has elasticity, and is formed such that the width of the 1 st wall portion in the axial direction of the rotary shaft is longer than the width of the seal member mounting groove,

The seal member is attached to the seal member attachment groove in a state in which the 1 st wall portion is compressed in the axial direction of the rotary shaft.

8. The endoscope of claim 6, wherein,

an urging member or an elastic member that urges one of the 1 st wall portion and the 3 rd wall portion away from the other is provided between the 1 st wall portion and the 3 rd wall portion of the seal member.

9. An endoscope as claimed in any one of claims 6 to 8, wherein,

the rotary shaft is divided into a 1 st rotary shaft and a 2 nd rotary shaft by taking a 2 nd groove wall surface of the sealing component mounting groove on the upright post side of the upright post as a boundary in the axial direction of the rotary shaft,

the 1 st rotation shaft is connected with the upright post of the upright stand at one end, and is provided with a 1 st connection part and a 2 nd groove wall surface at the other end,

the 2 nd rotation shaft has one end connected to the standing table and the other end provided with a 2 nd connecting portion connected to the 1 st connecting portion, the groove bottom surface, and the 1 st groove wall surface.

10. The endoscope according to claim 1 or 2, wherein,

when the direction on the opposite side to the 1 st direction is set to the 2 nd direction, one end of the rotation shaft is located at a position further away from the 2 nd direction than the holding hole opening on the standing side of the holding hole,

The partition wall has an opposite wall surface formed with the holding hole opening and opposite to the standing table,

the seal member is disposed between the opposing wall surface and the standing table, and has an insertion hole through which the rotation shaft is inserted, a 4 th wall portion that is in close contact with the opposing wall surface, and a 5 th wall portion that is in close contact with the rotation shaft side surface of the standing table.

11. The endoscope according to claim 1 or 2, wherein,

an annular seal member mounting groove into which the seal member is fitted and an annular wall portion which forms a 1 st groove wall surface on the standing table side of the seal member mounting groove are formed on an outer peripheral surface of the rotary shaft,

the seal member mounting groove is formed on the outer peripheral surface of the rotary shaft at a position closer to the standing stand upright side than the holding hole opening of the holding hole on the standing stand side,

the annular wall portion is configured to cover a part of a seal side surface of the seal member facing the 1 st groove wall surface with the 1 st groove wall surface.

12. The endoscope of claim 11, wherein,

a cutout is provided in a part of the outer peripheral surface of the annular wall.

13. The endoscope of claim 11, wherein,

The diameter of the outer peripheral surface of the annular wall portion is smaller than the diameter of the outer peripheral surface of the seal member.

14. The endoscope according to claim 1 or 2, wherein a cover airtight holding member that holds an airtight seal between the exposure window and the cover is provided.

15. An endoscope, comprising:

an insertion portion having a front end and a base end;

an operation section provided on a base end side of the insertion section and having an operation member;

a stand assembly provided on the front end side of the insertion portion;

a rotation shaft rotatably supported by the stand assembly;

a stand coupled to one end of the rotation shaft, and guiding a treatment tool guided from the stand assembly;

a stand upright including a rod main body portion, a rod base end portion provided on one end side of the rod main body portion and connected to the other end of the rotation shaft, and a rod tip portion provided on the other end side of the rod main body portion;

a rod accommodating chamber provided in the standing table assembly, for accommodating the standing table upright rod rotatably about the rotation axis, and having an exposure window for exposing a 1 st rod side surface of the standing table upright rod on a side opposite to the rotation axis side;

An operation wire having a base end side connecting portion connected to the operation member and a tip end side connecting portion connected to the tip end portion of the pole of the stand upright, the operation wire being configured to rotate the rotation shaft via the stand upright by operation of the operation member to raise the stand;

a partition wall which is a part of the standing table assembly, is provided between the rod accommodating chamber and the standing table, and has a holding hole for supporting the rotation shaft and a 1 st accommodating chamber wall surface which forms a bottom surface of the rod accommodating chamber on the standing table side and is open to the holding hole;

an annular seal member through which the rotary shaft is inserted and which maintains air tightness between an outer peripheral surface of the rotary shaft and an inner wall surface of the holding hole;

a cover detachably covering the exposure window;

a 1 st restriction portion provided on a lid inner surface of the lid on the standing stand upright side, the restriction portion being interposed between a main body portion side surface, which is a side surface of the lever main body portion, of the 1 st lever side surfaces and the lid inner surface to restrict displacement of the standing stand upright in a 1 st direction of the lid side in a direction parallel to an axis of the rotary shaft;

A 2 nd restricting portion provided on at least one of a 2 nd pole side surface of the rotating shaft side of the upright pole and the 1 st housing chamber wall surface, interposed between the 2 nd pole side surface and the 1 st housing chamber wall surface, and restricting displacement of the upright pole in a 2 nd direction on a side opposite to the 1 st direction; and

a standing table accommodating chamber which is a space for accommodating the standing table, wherein a gap is formed between an inner wall surface of the standing table accommodating chamber and both side surfaces of the 1 st direction side and the 2 nd direction side of the standing table which are respectively opposed to the inner wall surface,

the 1 st restriction portion has a shape of a rotation locus along at least a part of the main body side surface of the stand upright rotated about the rotation axis, and is interposed between the main body side surface and the cover inner surface at each rotation position of the stand upright.

16. An endoscope, comprising:

an insertion portion having a front end and a base end;

an operation section provided on a base end side of the insertion section and having an operation member;

a stand assembly provided on the front end side of the insertion portion;

a rotation shaft rotatably supported by the stand assembly;

A stand coupled to one end of the rotation shaft and guiding a treatment tool guided from the stand assembly;

a stand upright including a rod main body portion, a rod base end portion provided on one end side of the rod main body portion and connected to the other end of the rotation shaft, and a rod tip portion provided on the other end side of the rod main body portion;

a rod accommodating chamber provided in the standing table assembly, for accommodating the standing table upright rod rotatably about the rotation axis, and having an exposure window for exposing a 1 st rod side surface of the standing table upright rod on a side opposite to the rotation axis side;

an operation wire having a base end side connecting portion connected to the operation member and a tip end side connecting portion connected to the rod tip end portion of the stand upright, and causing the rotation shaft to rotate via the stand upright by an operation of the operation member to raise the stand;

a partition wall which is a part of the standing table assembly, is provided between the rod accommodating chamber and the standing table, and has a holding hole for supporting the rotation shaft and a 1 st accommodating chamber wall surface which forms a bottom surface of the rod accommodating chamber on the standing table side and is open to the holding hole;

An annular seal member through which the rotary shaft is inserted and which maintains air tightness between an outer peripheral surface of the rotary shaft and an inner wall surface of the holding hole;

a cover detachably covering the exposure window;

a 1 st restriction portion provided on at least one of a body portion side surface which is a side surface of the lever body portion of the 1 st lever side surface and a cover inner surface of the cover on the stand upright side, and interposed between the body portion side surface and the cover inner surface, for restricting displacement of the stand upright in a 1 st direction of the cover side in a direction parallel to an axis of the rotation shaft;

a 2 nd restricting portion provided on at least one of a 2 nd pole side surface of the rotating shaft side of the upright pole and the 1 st housing chamber wall surface, interposed between the 2 nd pole side surface and the 1 st housing chamber wall surface, and restricting displacement of the upright pole in a 2 nd direction on a side opposite to the 1 st direction; and

a standing table accommodating chamber which is a space for accommodating the standing table, wherein a gap is formed between an inner wall surface of the standing table accommodating chamber and both side surfaces of the 1 st direction side and the 2 nd direction side of the standing table which are respectively opposed to the inner wall surface,

The seal member is disposed between an inner wall surface of the holding hole and an outer peripheral surface of the rotary shaft, and a part of the seal member is exposed from a holding hole opening on the standing table side of the holding hole.

17. An endoscope, comprising:

an insertion portion having a front end and a base end;

an operation section provided on a base end side of the insertion section and having an operation member;

a stand assembly provided on the front end side of the insertion portion;

a rotation shaft rotatably supported by the stand assembly;

a stand coupled to one end of the rotation shaft and guiding a treatment tool guided from the stand assembly;

a stand upright including a rod main body portion, a rod base end portion provided on one end side of the rod main body portion and connected to the other end of the rotation shaft, and a rod tip portion provided on the other end side of the rod main body portion;

a rod accommodating chamber provided in the standing table assembly, for accommodating the standing table upright rod rotatably about the rotation axis, and having an exposure window for exposing a 1 st rod side surface of the standing table upright rod on a side opposite to the rotation axis side;

an operation wire having a base end side connecting portion connected to the operation member and a tip end side connecting portion connected to the rod tip end portion of the stand upright, and causing the rotation shaft to rotate via the stand upright by an operation of the operation member to raise the stand;

A partition wall that is a part of the standing table assembly, is provided between the rod accommodation chamber and the standing table, and has a holding hole that axially supports the rotation shaft, and a 1 st accommodation chamber wall surface that forms a bottom surface of the rod accommodation chamber on the standing table side and that opens the holding hole;

an annular seal member through which the rotary shaft is inserted and which maintains air tightness between an outer peripheral surface of the rotary shaft and an inner wall surface of the holding hole;

a cover detachably covering the exposure window;

a 1 st restriction portion provided on at least one of a body portion side surface which is a side surface of the lever body portion of the 1 st lever side surface and a cover inner surface of the cover on the stand upright side, and interposed between the body portion side surface and the cover inner surface, for restricting displacement of the stand upright in a 1 st direction of the cover side in a direction parallel to an axis of the rotation shaft;

a 2 nd restricting portion provided on at least one of a 2 nd pole side surface of the rotating shaft side of the upright pole and the 1 st housing chamber wall surface, interposed between the 2 nd pole side surface and the 1 st housing chamber wall surface, and restricting displacement of the upright pole in a 2 nd direction on a side opposite to the 1 st direction; and

A standing table accommodating chamber which is a space for accommodating the standing table, wherein a gap is formed between an inner wall surface of the standing table accommodating chamber and both side surfaces of the 1 st direction side and the 2 nd direction side of the standing table which are respectively opposed to the inner wall surface,

when the direction on the opposite side to the 1 st direction is set to the 2 nd direction, one end of the rotation shaft is located at a position further away from the 2 nd direction than the holding hole opening on the standing side of the holding hole,

the partition wall has an opposite wall surface formed with the holding hole opening and opposite to the standing table,

the seal member is disposed between the opposing wall surface and the standing table, and has an insertion hole through which the rotation shaft is inserted, a 4 th wall portion that is in close contact with the opposing wall surface, and a 5 th wall portion that is in close contact with the rotation shaft side surface of the standing table.

18. An endoscope, comprising:

an insertion portion having a front end and a base end;

an operation section provided on a base end side of the insertion section and having an operation member;

a stand assembly provided on the front end side of the insertion portion;

a rotation shaft rotatably supported by the stand assembly;

A stand coupled to one end of the rotation shaft and guiding a treatment tool guided from the stand assembly;

a stand upright including a rod main body portion, a rod base end portion provided on one end side of the rod main body portion and connected to the other end of the rotation shaft, and a rod tip portion provided on the other end side of the rod main body portion;

a rod accommodating chamber provided in the standing table assembly, for accommodating the standing table upright rod rotatably about the rotation axis, and having an exposure window for exposing a 1 st rod side surface of the standing table upright rod on a side opposite to the rotation axis side;

an operation wire having a base end side connecting portion connected to the operation member and a tip end side connecting portion connected to the rod tip end portion of the stand upright, and causing the rotation shaft to rotate via the stand upright by an operation of the operation member to raise the stand;

a partition wall that is a part of the standing table assembly, is provided between the rod accommodation chamber and the standing table, and has a holding hole that axially supports the rotation shaft, and a 1 st accommodation chamber wall surface that forms a bottom surface of the rod accommodation chamber on the standing table side and that opens the holding hole;

An annular seal member through which the rotary shaft is inserted and which maintains air tightness between an outer peripheral surface of the rotary shaft and an inner wall surface of the holding hole;

a cover detachably covering the exposure window;

a 1 st restriction portion provided on at least one of a body portion side surface which is a side surface of the lever body portion of the 1 st lever side surface and a cover inner surface of the cover on the stand upright side, and interposed between the body portion side surface and the cover inner surface, for restricting displacement of the stand upright in a 1 st direction of the cover side in a direction parallel to an axis of the rotation shaft;

a 2 nd restricting portion provided on at least one of a 2 nd pole side surface of the rotating shaft side of the upright pole and the 1 st housing chamber wall surface, interposed between the 2 nd pole side surface and the 1 st housing chamber wall surface, and restricting displacement of the upright pole in a 2 nd direction on a side opposite to the 1 st direction; and

a standing table accommodating chamber which is a space for accommodating the standing table, wherein a gap is formed between an inner wall surface of the standing table accommodating chamber and both side surfaces of the 1 st direction side and the 2 nd direction side of the standing table which are respectively opposed to the inner wall surface,

An annular seal member mounting groove into which the seal member is fitted and an annular wall portion which forms a 1 st groove wall surface on the standing table side of the seal member mounting groove are formed on an outer peripheral surface of the rotary shaft,

the seal member mounting groove is formed on the outer peripheral surface of the rotary shaft at a position closer to the standing stand upright side than the holding hole opening of the holding hole on the standing stand side,

the annular wall portion is configured to cover a part of a seal side surface of the seal member facing the 1 st groove wall surface with the 1 st groove wall surface.

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