CN112244961A - Sheath pipe adjusting mechanism and adjustable bent sheath pipe - Google Patents

Abstract

The invention provides a sheath tube adjusting mechanism and an adjustable bent sheath tube, relating to the technical field of medical instruments, and the sheath tube adjusting mechanism provided by the invention comprises: slider, traction wire and traction ring are equipped with single or a plurality of threading structures that are used for the traction wire to pass through on the slider, and the threading structure distributes along the circumference of slider, the one end of traction wire through threading structure and with slider fixed connection, the other end and the traction ring fixed connection of traction wire, the traction ring is used for inlaying and locates the sheath pipe of turning. The sheath adjusting mechanism provided by the invention solves the problems that the connection mode between the traction wire and the sliding block is complex and the stress numerical value is low in the related technology.

Description

Sheath pipe adjusting mechanism and adjustable bent sheath pipe

Technical Field

The invention relates to the technical field of medical instruments, in particular to a sheath tube adjusting mechanism and an adjustable bent sheath tube.

Background

Interventional therapy is minimally invasive therapy carried out by modern high-tech means, namely, under the guidance of medical imaging equipment, special precise medical instruments such as catheters, guide wires and the like are introduced into a human body to diagnose and locally treat pathological changes in the human body. The interventional operation has small wound on human body, less invasiveness, quick recovery and good effect, and is a medical technology which is rapidly developed and widely popularized in recent years.

At present, an interventional operation usually needs to establish a channel between a diseased part in a patient and an external operation end by means of an interventional diagnosis and treatment sheath (such as a guide catheter, a conveying sheath, a guiding sheath and the like) so as to introduce various diagnosis and treatment instruments, medicines, implantation instruments and the like to the diseased part of the patient, and the purpose of avoiding surgical operation to reach the diseased part is achieved. The interventional diagnosis and treatment sheath generally comprises a tube body and a handle, wherein the tube body is usually longer and is provided with an inner cavity used as a channel, the tube body is provided with a far end and a near end, the far end can conveniently enter a human body lumen (such as a blood vessel), and the near end is used for connecting the handle for professional medical care personnel to use.

It is known that in interventional procedures, the larger the diameter of the lumen of the tube, the easier it is to deliver instruments and drugs, and the smaller the outer diameter of the tube, the less trauma to the body lumen. Generally, a medical staff performing an interventional operation needs to deliver the distal end of the sheath to a predetermined position through an operation of the handle in vitro under the guidance of the X-ray machine. A better sheath design should have both: good guidance, torsion control, adequate axial and radial support, and maximization of the ratio of the inner diameter to the outer diameter, i.e., thinning. In addition, the distal end of the sheath may be pre-shaped into different curved shapes to conform to the anatomical morphology of the specific lesion site, depending on the intended use of the sheath. However, even if various shapes and angles of distal end pre-shaping interventional type medical sheaths are developed, the following frequently occur in clinical use: the distal end pre-molded sheath tubes with various shapes and angles can not be adapted to individual physiological anatomical structures one by one, when the problems occur in the operation, a doctor usually withdraws the sheath tube and selects the pre-molded sheath tubes with other shapes again, so that the operation consumption is improved, the cost borne by a patient is increased, the probability that the lumen tissues of the patient are damaged is increased, the operation time is prolonged, and the radiation time of the patient is prolonged. Distal end pre-shaping interventional diagnostic sheath tubes of various shapes and angles are put into clinical use. This requires the hospital to have to stock all the shapes and specifications of the sheaths, which will undoubtedly increase the stock size and quantity of the hospital and increase the cost of the hospital. Based on the above situation, in recent years, a sheath distal end bending adjustable technology has been developed, which can change the sheath distal end repeatedly between different angles through an in vitro adjustment operation so as to adapt to different physiological anatomical forms. The adjustable bent sheath tube in the prior art needs to connect the traction wire and the sliding block by means of a plurality of parts, the connection mode is complex, the corresponding maximum connection force is about 30-40N, and the stress numerical value is low.

Disclosure of Invention

The invention aims to provide a sheath tube adjusting mechanism and an adjustable bent sheath tube, which are used for solving the problems that the connection mode between a traction wire and a sliding block is complex and the stress numerical value is low in the related technology.

In a first aspect, the present invention provides a sheath adjustment mechanism comprising: the traction device comprises a sliding block, a traction wire and a traction ring, wherein a single or a plurality of wire penetrating structures are arranged on the sliding block, the wire penetrating structures are used for the traction wire to pass through, the wire penetrating structures are distributed along the circumferential direction of the sliding block, one end of the traction wire passes through the wire penetrating structures and is fixedly connected with the sliding block, the other end of the traction wire is fixedly connected with the traction ring, and the traction ring is used for being embedded in a bending sheath pipe.

Furthermore, the wire penetrating structure comprises wire penetrating holes, the plurality of wire penetrating holes are distributed along the circumferential direction of the sliding block and extend along the axial direction of the sliding block or along the direction forming an included angle with the axial direction, and one end of the traction wire penetrates through the wire penetrating holes and is fixedly connected with the sliding block.

Further, the sheath adjusting mechanism further comprises a pin, the pin is arranged in at least one of the threading holes through which the traction wire passes, and the pin is in interference fit with the threading holes.

Further, the wire penetrating structure comprises wire penetrating grooves formed in the peripheral wall of the sliding block, the wire penetrating grooves are distributed along the circumferential direction of the sliding block at intervals, the wire penetrating grooves are adjacent to each other and are communicated with each other, one end portion of the traction wire is located in the wire penetrating grooves, and the sliding block is sleeved with a fixing piece used for fixing the traction wire.

Further, sheath pipe adjustment mechanism still includes and changes cover and slide rail, the slide rail with the slider all is located change the cover, change the cover and be equipped with interior double thread, the slider cover is located the slide rail, and with change cover screw-thread fit.

Furthermore, the slide rail includes the slide rail body and locates guide protrusion on the slide rail body, be equipped with the direction through-hole on the slider, be equipped with on the circumference wall of direction through-hole with guide protrusion sliding fit's spacing groove.

Furthermore, the sliding block is provided with a wire passing hole for the traction wire to pass through, and the circumferential wall of the guide through hole is provided with a wire passing groove communicated with the wire passing hole.

Furthermore, the traction ring is provided with at least one material fixing hole.

Furthermore, the traction wire is inserted into the traction ring and connected with the traction ring in a welding mode.

In a second aspect, the adjustable bending sheath provided by the invention comprises a handle, a bending sheath and the sheath adjusting mechanism, wherein the sheath adjusting mechanism is arranged in the handle, one end of the bending sheath is positioned in the handle, the other end of the bending sheath extends in a direction away from the handle, and a traction ring in the sheath adjusting mechanism is embedded in the bending sheath.

The sheath pipe bending adjusting mechanism and the adjustable bending sheath pipe provided by the invention comprise: slider, traction wire and traction ring are equipped with single or a plurality of threading structures that are used for the traction wire to pass through on the slider, and the threading structure distributes along the circumference of slider, the one end of traction wire through threading structure and with slider fixed connection, the other end and the traction ring fixed connection of traction wire, the traction ring is used for inlaying and locates the sheath pipe of turning. When the sheath tube adjusting mechanism provided by the invention is used, the sliding block pulls one end of the traction wire to move towards the direction close to or away from the traction ring, and the traction wire pulls the bending adjusting sheath tube through the traction ring embedded in the bending adjusting sheath tube, so that the bending adjusting sheath tube is adjusted. The traction wire is fixedly connected with the sliding block through a plurality of wire penetrating structures, so that the stress value between the traction wire and the sliding block is improved, and the connection structures between the traction wire and the sliding block are simple; in addition, the fixing force between the traction wire and the sliding block can be stably and dynamically adjusted by adjusting the number of wire penetrating structures through which the traction wire penetrates; the number of the threading structures through which the traction wire passes can be visually seen, so that the fixing effectiveness can be effectively evaluated according to the number of the threading structures through which the traction wire passes.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a first schematic structural diagram of a sheath adjusting mechanism according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a sheath adjusting mechanism according to an embodiment of the present invention;

fig. 3 is a third schematic structural diagram of a sheath adjusting mechanism according to an embodiment of the present invention;

fig. 4 is a schematic view illustrating the matching of a pull wire and a wire feeding hole in the sheath adjusting mechanism according to the embodiment of the present invention;

fig. 5 is a schematic view illustrating arrangement of pins in the sheath adjusting mechanism according to the embodiment of the present invention;

fig. 6 is a cross-sectional view of the engagement of a pin and a slider in the sheath adjustment mechanism according to the embodiment of the present invention;

fig. 7 is a fourth schematic structural diagram of a sheath adjusting mechanism according to an embodiment of the present invention;

fig. 8 is a schematic connection diagram of a constraining ring and a sliding block in the sheath adjusting mechanism according to the embodiment of the present invention;

fig. 9 is a schematic connection diagram of a constraining sheath and a sliding block in the sheath adjusting mechanism according to the embodiment of the present invention;

fig. 10 is a first schematic structural diagram of a traction ring in a sheath adjusting mechanism according to an embodiment of the present invention;

fig. 11 is a second schematic structural diagram of a traction ring in the sheath adjusting mechanism according to the embodiment of the present invention;

fig. 12 is a schematic structural diagram of a pull wire in the sheath adjusting mechanism according to the embodiment of the present invention;

fig. 13 is a schematic view of an internal structure of an adjustable bending sheath according to an embodiment of the present invention.

Icon: 100-a slider; 101-filament passing holes; 102-a wire passing groove; 103-a limiting groove; 110-a threaded portion; 120-a guide; 121-a confinement groove; 130-a confinement ring; 140-a constraining sheath; 200-drawing wires; 210-a plug-in projection; 300-a traction ring; 310-material fixing holes; 320-slot; 410-threading holes; 420-threading slot; 500-pin; 600-sleeve turning; 610-a limit protrusion; 700-a slide rail; 710-a slide rail body; 720-guide projection; 800-handle; 810-connecting a front pipe; 811-a limit groove; 820-sheath seat; 830-a haemostatic valve cover; 840-locking the rear cover; 900-bending sheath.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The sheath adjusting mechanism provided by the embodiment of the invention comprises: theslider 100, thetraction wire 200 and thetraction ring 300, be equipped with single or a plurality of threading structures that are used for thetraction wire 200 to pass through on theslider 100, the threading structure distributes along the circumference ofslider 100, the one end oftraction wire 200 through the threading structure and withslider 100 fixed connection, the other end and thetraction ring 300 fixed connection oftraction wire 200, thetraction ring 300 is used for inlaying and locates thesheath pipe 900 of turning.

In some embodiments, the sheath adjusting mechanism further includes a guide sleeve, and theslider 100 is slidably fitted to the guide sleeve along an axial direction thereof. When the thread passing structure includes thethread passing hole 410, thethread passing hole 410 passes through theslider 100 in the axial direction of theslider 100 or passes through theslider 100 in the direction perpendicular to the axial direction of theslider 100. One end of thetraction wire 200 may pass through all or part of thethreading holes 410 and be fixedly coupled to theslider 100, the fixing force between thetraction wire 200 and theslider 100 may be adjusted by controlling the number of thethreading holes 410 through which thetraction wire 200 passes, and in addition, apin 500 may be installed in thethreading holes 410 through which all thetraction wires 200 pass or in the part of thethreading holes 410 through which thetraction wire 200 passes, and the fixing force between thetraction wire 200 and theslider 100 may be adjusted by controlling the number of theinstallation pins 500.

When the threading structure comprisesthreading grooves 420, a plurality ofthreading grooves 420 are arranged on the outer peripheral surface of the slidingblock 100 and are spaced along the circumferential direction of thesliding block 100, thethreading grooves 420 extend along the axis of the slidingblock 100,adjacent threading grooves 420 are communicated with each other, one end of onethreading groove 420 extends to the end part of thesliding block 100, and thetraction wire 200 can extend out of thesliding block 100 through thethreading groove 420. One end of thetraction wire 200 is positioned in thewire passing groove 420, a fixing piece is sleeved outside the slidingblock 100 to prevent thetraction wire 200 from sliding relative to thesliding block 100, and the fixing force between thetraction wire 200 and the slidingblock 100 can be adjusted by controlling the number of thewire passing grooves 420 in which thetraction wire 200 is positioned.

In this embodiment, as shown in fig. 13, the adjusting mechanism further includes arotating sleeve 600 and a slidingrail 700, the slidingrail 700 and the slidingblock 100 are both located in therotating sleeve 600, the rotatingsleeve 600 is provided with an inner double thread, and the slidingblock 100 is sleeved on the slidingrail 700 and is in threaded fit with the rotatingsleeve 600.

As shown in fig. 1, theslider 100 includes a threadedportion 110 and aguide portion 120, theguide portion 120 being connected to one end of the threadedportion 110, the threadedportion 110 being provided with an external double-start thread that mates with the internal double-start thread on the rotatingsleeve 600. Specifically, changecover 600 and include stop collar and lower stop collar, go up the stop collar and all be equipped with interior double-thread head on the stop collar, go up the structure of stop collar promptly and the structure of lower stop collar the same, in process of production, accessible same grinding apparatus injection moulding goes up stop collar and lower stop collar, practices thrift manufacturing cost and convenient processing.

The threading structure may be disposed on the threadedportion 110 or the guidingportion 120, and thetraction wire 200 is connected to the threadedportion 110 or the guidingportion 120 through the threading structure and extends out from an end of the guidingportion 120 away from the threadedportion 110. When thesheath tube 900 is adjusted to be bent, therotating sleeve 600 rotates around the axis of therotating sleeve 600, the slidingrail 700 prevents the slidingblock 100 from rotating along therotating sleeve 600, and therefore under the action of therotating sleeve 600 and the slidingrail 700, the slidingblock 100 drives one end of thetraction wire 200 to move along the axial direction of the slidingblock 100, so that the sheath tube is adjusted through thetraction wire 200 and thetraction ring 300. Theslider 100 is adjusted to remove through screw-thread fit's mode to adjust and transfercurved sheath pipe 900, conveniently adjust, and the accessible realizes sheath pipe adjustment mechanism's auto-lock to setting up of screw thread angle on commentaries on classics cover 600 and theslider 100, need not to control all the time after transferringslider 100 to the position of needs and changes cover 600, conveniently carries out the operation.

As shown in fig. 1, fig. 2 and fig. 3, the threading structure includes threadingholes 410, a plurality of threadingholes 410 are distributed along the circumferential direction of theslider 100 and all extend along the axial direction of theslider 100 or in a direction forming an angle with the axial direction, and one end of thetraction wire 200 passes through the threading holes 410 and is fixedly connected with theslider 100.

As shown in fig. 1 and 2, the diameter of the threadedportion 110 is larger than that of theguide portion 120, when the threading holes 410 extend in the radial direction of theslider 100, the threading holes 410 are provided in the threadedportion 110, and a plurality of the threading holes 410 are spaced apart in the circumferential direction of the threadedportion 110 and each penetrate through the threadedportion 110. One end of thetraction wire 200 passes through the plurality of threadingholes 410, and the end passing through the threading holes 410 can be fixedly coupled with the threadedpart 110 by winding, knotting, gluing or at least two fitting methods.

As shown in fig. 3, when the threading holes 410 extend in the radial direction of theslider 100, the threading holes 410 are disposed at the end of theguide portion 120 away from the threadedportion 110, and as shown in fig. 4, a plurality of threadingholes 410 are distributed at intervals in the circumferential direction of theguide portion 120 and all penetrate through theguide portion 120 in the radial direction of theslider 100. One end of thethreading hole 410 may sequentially pass through the plurality of threadingholes 410 or may pass through the plurality of threadingholes 410 at intervals, and the end passing through thethreading hole 410 may be fixedly connected with the threadedpart 110 by winding, knotting, gluing or at least two matching manners.

As shown in fig. 1, thetraction wire 200 passes through the plurality ofwire passing holes 410 and is fixedly connected with theslider 100, or as shown in fig. 2, thetraction wire 200 passes through two adjacentwire passing holes 410 for multiple times, so that the stress value between thetraction wire 200 and theslider 100 is improved, the connection structure between thetraction wire 200 and theslider 100 is simple, the used fixing principle is that thetraction wire 200 passes through thewire passing holes 410 and then is fixed with the friction force between thetraction wire 200 and theslider 100, and the friction force of thetraction wire 200 passing through thewire passing holes 410 is correspondingly increased in traction every time, so that the fixing force between thetraction wire 200 and theslider 100 can be stably and dynamically adjusted by adjusting the number or the times of the traction passingwire passing holes 410; the number of the threading holes 410 through which thetraction wire 200 is passed can be visually observed, and thus the effectiveness of the fixation can be effectively evaluated according to the number of the threading holes 410 through which thetraction wire 200 is passed.

As shown in fig. 5 and 6, the sheath adjusting mechanism further includes apin 500, and in the threading holes 410 through which thetraction wire 200 passes, apin 500 is provided in at least one of the threading holes 410, and thepin 500 is in interference fit with the threading holes 410.

Specifically, in the threading holes 410 through which thetraction wire 200 is passed, thepins 500 may be provided in all of the threading holes 410 or thepins 500 may be provided in a part of the threading holes 410, and thetraction wire 200 is clamped between thepins 500 and the inner wall of the threading holes 410. In thethreading hole 410 where thepin 500 is disposed, thepin 500 may be disposed at one end of thethreading hole 410 or thepins 500 may be disposed at both ends of thethreading hole 410, and the length of thepin 500 may be any length, and the fixing force of thetraction wire 200 and theslider 100 may be stably and dynamically adjusted by adjusting the number of thepins 500 or the length of thepin 500 engaged with thethreading hole 410.

As another embodiment, as shown in fig. 7, the threading structure includes threadinggrooves 420 formed in the outer circumferential wall of theslider 100, a plurality of threadinggrooves 420 are spaced apart from each other along the circumferential direction of theslider 100, adjacent threadinggrooves 420 are communicated with each other, one end of thepull wire 200 is located in thethreading groove 420, and theslider 100 is sleeved with a fixing member for fixing thepull wire 200.

A plurality of threadinggrooves 420 are formed on the outer circumferential surface of theguide part 120 along the circumferential interval portion of theguide part 120, the threadinggrooves 420 extend along the axis of theguide part 120, and theadjacent threading grooves 420 are communicated with each other, wherein one end of one of the threadinggrooves 420 extends to the end of theguide part 120, and thetraction wire 200 can protrude out of theguide part 120 through the threadinggroove 420. The fixing member comprises arestraining ring 130 or a restrainingsleeve 140, a restraininggroove 121 is formed in the outer peripheral wall of theguide part 120, the restraininggroove 121 extends along the circumferential direction of theguide part 120, as shown in fig. 8, the restrainingring 130 can be located in the restraininggroove 121, the restraininggroove 121 limits therestraining ring 130, and as shown in fig. 8 and 9, the restrainingring 130 or a restraining belt fixes thetraction wire 200. One end of thetraction wire 200 is positioned in thethreading groove 420, and a fixing member is sleeved outside to prevent thetraction wire 200 from sliding relative to theguide part 120, and the fixing force between thetraction wire 200 and theguide part 120 can be adjusted by controlling the number of the threadinggrooves 420 in which thetraction wire 200 is positioned.

Further, theslide rail 700 includes aslide rail body 710 and aguide protrusion 720 disposed on theslide rail body 710, a guide through hole is disposed on theslide block 100, and alimit groove 103 slidably engaged with theguide protrusion 720 is disposed on a circumferential wall of the guide through hole.

The cross section of the slidingrail body 710 is circular, and theguide protrusion 720 is disposed on the circumferential surface of the slidingrail body 710 and extends along the length direction of the slidingrail body 710. The limitinggroove 103 is disposed inside theslider 100, and when theslider 100 is sleeved on theslider 100, the limitinggroove 103 is in sliding fit with theguide protrusion 720. When therotating sleeve 600 is rotated, theguide protrusion 720 is matched with the limitinggroove 103 to prevent the slidingblock 100 from rotating along with therotating sleeve 600, so that the slidingblock 100 slides along the length direction of the slidingrail body 710, and theguide protrusion 720 is matched with the limitinggroove 103 to play a role in guiding the movement of the slidingblock 100, so that the sliding of the slidingblock 100 is more stable. Locateslider 100's inside withspacing groove 103,slider 100's inside andslide rail 700 cooperation reduce the space that sheath pipe adjustment mechanism occupy, make sheath pipe adjustment mechanism's structure compacter.

As shown in fig. 1 and 2, theslider 100 is provided with awire passing hole 101 for passing atraction wire 200 therethrough, and the circumferential wall of the guide through hole is provided with awire passing groove 102 communicated with thewire passing hole 101.

Specifically, thewire passing hole 101 is formed in a side wall of theguide part 120 and penetrates through theguide part 120, awire passing groove 102 is formed in an inner wall of theguide part 120, one end of thewire passing groove 102 is communicated with thewire passing hole 101, and the other end of the wire passing groove extends to one end of theguide part 120, which is far away from the threadedpart 110. When thethreading hole 410 is formed in the threadedpart 110 in the axial direction of theslider 100, thetraction wire 200 engaged with the threadedpart 110 may pass through thethreading hole 101 into the inner wall of theguide part 120 and protrude from one end of theguide part 120 along thewire passing groove 102. When the threading holes 410 are formed in theguide part 120 in the radial direction of theslider 100, one of the threading holes 410 may be used as thethreading hole 101, so that thetraction wire 200 is extended out of theguide part 120 from the inside or the outside of theguide part 120 by controlling the threading manner of thetraction wire 200. When theguide part 120 is provided with the threadinggroove 420, thepull wire 200 may extend out of theguide part 120 from the outside of theguide part 120 through the threadinggroove 420 extended to one end of theguide part 120, or may extend into the inside of theguide part 120 through thewire passing hole 101 provided in theguide part 120, and extend out of theguide part 120 from the inside of theguide part 120. The arrangement of thewire passing hole 101 enables thetraction wire 200 to extend out of theguide part 120 from the interior of theguide part 120, so that friction between thetraction wire 200 and other parts is prevented, thewire passing groove 102 plays a limiting role in thetraction wire 200, and thetraction wire 200 is prevented from being inclined to influence the adjustment of the bendingsheath 900.

As shown in fig. 10 and 11, thetraction ring 300 is provided with at least onematerial fixing hole 310. Specifically, the number of thematerial fixing holes 310 may be one, two, three, or four, and in this embodiment, the number of thematerial fixing holes 310 is four, and the fourmaterial fixing holes 310 are spaced along the circumference of thetraction ring 300 and all penetrate through thetraction ring 300. When thetraction ring 300 is embedded in the bendingsheath tube 900, thematerial fixing hole 310 is arranged to enable the pebax material to be melted into thematerial fixing hole 310, and the pebax material in thematerial fixing hole 310 is matched with the inner wall of thetraction ring 300 to limit thetraction ring 300, so that thetraction ring 300 is firmly fixed and can bear large traction force.

Further, the pullingwire 200 is inserted into the pullingring 300 and connected to the pullingring 300 by welding. As shown in fig. 10, 11 and 12, thepull ring 300 is provided with aslot 320, one end of thepull wire 200 connected with thepull ring 300 is in a flat shape, and is provided with one, two or threeinsertion protrusions 210, the number of theinsertion protrusions 210 is equal to that of theslot 320, theinsertion protrusions 210 are inserted into theslot 320 in a one-to-one correspondence manner, and the connection portion of theinsertion protrusions 210 and theslot 320 is connected by laser welding, so that the connection strength is high, and the pull ring is safe, stable and reliable.

The cross-sectional shape of thetraction wire 200 may be circular, rectangular, triangular or polygonal, etc., in this embodiment, the cross-section of thetraction wire 200 is rectangular, so that the strength may be increased by means of the sectional area of the wire material, and the strength of thetraction wire 200 may be adjusted by increasing the length of the cross-section without changing the width.

As shown in fig. 13, the adjustable bending sheath according to the embodiment of the present invention includes ahandle 800, a bendingsheath 900 and the sheath adjusting mechanism, the sheath adjusting mechanism is disposed in thehandle 800, one end of the bendingsheath 900 is disposed in thehandle 800, the other end extends in a direction away from thehandle 800, and atraction ring 300 of the sheath adjusting mechanism is embedded in the bendingsheath 900.

Specifically, handle 800 includes epitheca and inferior valve, the epitheca can be dismantled with the inferior valve and be connected, be equipped with the installation cavity between two kinds, the installation cavity is located to the one end of commentaries on classics cover 600, the other end is located outside the installation vestibule, the inside of commentaries on classics cover 600 is all located to sliderail 700 andslider 100,slide rail 700 is passed to the one end of transferringcurved sheath pipe 900, the other end extends to the direction of keeping away fromslide rail 700, the one end ofslide rail 700 is equipped with connectsfront tube 810, it is located commentaries on classics cover 600 to connectfront tube 810, and the cover is located and is transferredcurved sheath pipe 900 on, the one side that deviates from ofslide rail 700 is connected with thesheath pipe seat 820 that is used for transferringcurved sheath pipe 900 to pass, one side thatsheath pipe seat 820 deviates from slide rail. Be equipped withspacing recess 811 on the periphery wall of connectinghead tube 810,spacing recess 811 extends along the circumference of connectinghead tube 810, all is equipped with on the inner wall of commentaries on classics cover 600 withspacing recess 811 sliding fit'sspacing arch 610, and spacing arch 610 is locatedspacing recess 811, and when rotatingcover 600, spacing arch 610 and the cooperation ofspacing recess 811 play direction and spacing effect to cover 600. When the bending adjustingsheath tube 900 is adjusted, therotating sleeve 600 rotates around the axis of therotating sleeve 600 relative to the slidingblock 100, the slidingrail 700 prevents the slidingblock 100 from rotating along with therotating sleeve 600, therefore, under the action of therotating sleeve 600 and the slidingrail 700, the slidingblock 100 drives one end of thetraction wire 200 to move along the axial direction of the slidingblock 100, and the bending adjustingsheath tube 900 is adjusted through thetraction wire 200 and thetraction ring 300. The slidingblock 100 is adjusted to move in a thread matching mode, so that thebent sheath tube 900 is adjusted, and adjustment is facilitated.

The embodiment of the invention provides a sheath pipe bending adjusting mechanism and a bending adjustable sheath pipe, wherein the sheath pipe adjusting mechanism comprises: theslider 100, thetraction wire 200 and thetraction ring 300, be equipped with single or a plurality of threading structures that are used for thetraction wire 200 to pass through on theslider 100, the threading structure distributes along the circumference ofslider 100, the one end oftraction wire 200 through the threading structure and withslider 100 fixed connection, the other end and thetraction ring 300 fixed connection oftraction wire 200, thetraction ring 300 is used for inlaying and locates thesheath pipe 900 of turning. When the sheath adjusting mechanism provided by the embodiment of the invention is used, theslider 100 pulls one end of thetraction wire 200 to move towards the direction close to or away from thetraction ring 300, and thetraction wire 200 pulls thebending adjusting sheath 900 through thetraction ring 300 embedded in thebending adjusting sheath 900, so that thebending adjusting sheath 900 is adjusted. Thetraction wire 200 is fixedly connected with the slidingblock 100 through a plurality of wire penetrating structures, so that the stress value between thetraction wire 200 and the slidingblock 100 is improved, and the connection structures between thetraction wire 200 and the slidingblock 100 are simple; in addition, the fixing force between thetraction wire 200 and the slidingblock 100 can be stably and dynamically adjusted by adjusting the number of the wire penetrating structures which are drawn through; the number of threading structures through which thepull wire 200 passes is visually observable, and thus the effectiveness of the fixation can be effectively evaluated based on the number of threading structures through which thepull wire 200 passes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A sheath adjustment mechanism, comprising: slider (100), traction wire (200) and traction ring (300), be equipped with on slider (100) single or a plurality of be used for wire passing structure that traction wire (200) passed through, wire passing structure follows the circumference of slider (100) distributes, the one end process of traction wire (200) wire passing structure and with slider (100) fixed connection, the other end of traction wire (200) with traction ring (300) fixed connection, traction ring (300) are used for inlaying and locate and transfer curved sheath pipe (900).

2. The sheath adjusting mechanism according to claim 1, wherein the threading structure comprises threading holes (410), a plurality of the threading holes (410) are distributed along the circumferential direction of the sliding block (100) and extend along the axial direction of the sliding block (100) or in a direction forming an included angle with the axial direction, and one end of the traction wire (200) passes through the threading holes (410) and is fixedly connected with the sliding block (100).

3. The sheath adjustment mechanism according to claim 2, further comprising a pin (500), wherein the pin (500) is provided in at least one of the threading holes (410) through which the traction wire (200) passes, and the pin (500) is in interference fit with the threading hole (410).

4. The sheath adjusting mechanism according to claim 1, wherein the threading structure includes threading grooves (420) formed in an outer peripheral wall of the slider (100), the threading grooves (420) are circumferentially spaced apart from each other along the slider (100), adjacent threading grooves (420) are communicated with each other, one end of the pull wire (200) is located in the threading groove (420), and the slider (100) is sleeved with a fixing member for fixing the pull wire (200).

5. The sheath adjusting mechanism according to any one of claims 1-4, further comprising a rotating sleeve (600) and a sliding rail (700), wherein the sliding rail (700) and the sliding block (100) are both located in the rotating sleeve (600), the rotating sleeve (600) is provided with an internal double thread, and the sliding block (100) is sleeved on the sliding rail (700) and is in threaded fit with the rotating sleeve (600).

6. The sheath adjusting mechanism according to claim 5, wherein the slide rail (700) comprises a slide rail body (710) and a guide protrusion (720) arranged on the slide rail body (710), the slide block (100) is provided with a guide through hole, and a circumferential wall of the guide through hole is provided with a limit groove (103) in sliding fit with the guide protrusion (720).

7. The sheath adjusting mechanism according to claim 6, wherein the slider (100) is provided with a threading hole (101) for the traction wire (200) to pass through, and a threading groove (102) communicated with the threading hole (101) is provided on a circumferential wall of the guiding through hole.

8. The sheath adjustment mechanism of claim 1, wherein the pull ring (300) is provided with at least one material fixation hole (310).

9. The sheath adjustment mechanism of claim 1, wherein the pull wire (200) is inserted into the pull ring (300) and connected to the pull ring (300) by welding.

10. An adjustable bending sheath (900), comprising a handle (800), an adjustable bending sheath (900) and the sheath adjusting mechanism of any one of claims 1-9, wherein the sheath adjusting mechanism is disposed in the handle (800), one end of the adjustable bending sheath (900) is disposed in the handle (800), the other end extends in a direction away from the handle (800), and a traction ring (300) in the sheath adjusting mechanism is embedded in the adjustable bending sheath (900).

Images