Disclosure of Invention
The invention aims to provide an end effector and a medical instrument, which can enable the pin feet of the staples to be misplaced into the staples, ensure that the pin feet of the staples formed by each staple are fully bent, ensure more reliable suturing and have better anastomosis effect.
The end effector is used for enabling the anastomotic nail to be shot into a nail, the anastomotic nail is provided with a nail body and nail feet arranged at two ends of the nail body, and is characterized by comprising a nail bin assembly used for accommodating the anastomotic nail and a nail anvil assembly butted with the nail bin assembly, wherein the nail bin assembly is provided with a nail bin opening opposite to the nail bin assembly, the nail anvil assembly is provided with a nail pit butted with the nail bin opening, when the nail bin is shot, the nail pit props against the nail feet to enable the nail feet to be bent to form the nail in a way of being offset to one side relative to the nail body, and after the nail is formed, the projection of the nail feet on the nail anvil assembly falls into the nail bin opening.
Further, the nail pit comprises a first pit and a second pit, when the nail pit is triggered, two nail feet of the anastomat are respectively propped in the first pit and the second pit, and the first pit and the second pit respectively enable the two nail feet of the anastomat to bend towards the side edge direction of the nail body.
Further, the first pit and the second pit are respectively provided with a first oblique side and a second oblique side which are opposite, when the stapling nail is fired, the first pit and the second pit bend two nail feet of the stapling nail, and the two nail feet are respectively bent into a nail along the first oblique side and the second oblique side in a shifting way towards one side relative to the nail body.
Further, the positions of the nail feet from the first pits and/or the second pits are defined as nail outlet openings, the distance between the two nail outlet openings of the same nail pit is a nail outlet distance, the nail outlet distance is larger than the diameter of the anastomat, and the sum of the nail outlet distance and the diameter of the anastomat is smaller than the width of the nail bin opening.
Further, the staple pitch is greater than the diameter of the staples.
Further, the nail bin assembly is provided with a working surface, the nail bin opening is arranged on the working surface, and after the nails are formed, the projection of the nail feet falls into the nail bin opening.
Further, at least two groups of nail pits are arranged on the nail anvil assembly, and the working face is provided with a corresponding group of nail bin openings.
The nail anvil assembly comprises a nail anvil head and a nail anvil rod arranged on the nail anvil head, an annular elastic locking piece is sleeved on the outer circumference of the nail anvil rod, a lock hole communicated with the inserting cavity is formed in the outer circumference of the nail anvil rod in a penetrating mode, a clamping block is arranged in the lock hole, one end of the clamping block is fixed or abutted to the elastic locking piece, and the other end of the clamping block extends into the inserting cavity.
Further, the lockhole is round platform shape, be close to in the lockhole the opening of grafting chamber is less than being close to the opening of elasticity hasp piece, the fixture block has the butt the first end of the inner wall of hasp piece and stretch into to the second end in the grafting chamber, the sectional area of first end is greater than the sectional area of second end.
Further, the elastic locking piece is provided with an opening.
Further, the number of the clamping blocks is one, and the positions of the clamping blocks propped against the elastic locking pieces are symmetrically arranged with the openings in the axial direction of the elastic locking pieces.
Further, the clamping block is fixedly connected with the inner wall of the elastic locking piece.
Further, the nail anvil rod comprises an injection molding rod body formed by downwards extending the nail anvil head and a metal rod body with one end embedded on the injection molding rod body, wherein the metal rod body is provided with a metal wire binding part for binding wires during operation, the nail anvil head and the injection molding rod body are integrally formed by injection molding, and the metal wire binding part is close to the nail anvil head.
Further, an annular groove is formed in the outer circumference of the puncture shaft in a concave mode, and the elastic locking piece is arranged in the annular groove.
The invention also provides a medical instrument which comprises a working head, a shaft assembly connected with the working head and the end effector, wherein the end effector is connected with the shaft assembly, and a driving device for driving the shaft assembly to work is arranged in the working head.
Further, a connecting mechanism is arranged in the working head and comprises a first butt joint part, a second butt joint part and a switching piece, wherein the second butt joint part is arranged in parallel with the first butt joint part, the switching piece is sleeved between the first butt joint part and the second butt joint part, one end of the switching piece is meshed with the second butt joint part, the other end of the switching piece is in butt joint with the first butt joint part, and the switching piece can move relative to the first butt joint part on the second butt joint part so that the switching piece is partially sleeved on the first butt joint part or separated from the first butt joint part.
Further, a butt joint cavity with a circular cross section and a plurality of butt joint blocks formed by inwards extending from the side wall of the butt joint cavity are formed in the switching piece, a butt joint groove is formed between two adjacent butt joint blocks, a plug connector used for being contained in at least part of the butt joint grooves is formed on the first butt joint part, and when the switching piece is sleeved on the first butt joint part, the plug connector can be extruded by the butt joint blocks to move towards the radial direction of the first butt joint part.
Further, the medical instrument is a tubular anastomat, and two or three groups of nail pits and nail bin openings which are distributed in concentric circles are respectively arranged on the nail anvil component and the nail bin component.
Further, the medical instrument is a linear anastomat, and four groups or six groups of nail pits and nail bin openings which are linearly distributed are respectively arranged on the nail anvil component and the nail bin component.
Compared with the prior art, the end effector and the medical instrument have the beneficial effects that the pin feet of the staples are misplaced into the staples by arranging the pin pits, and the pin feet of the staples are propped until the projections of the pin feet fall into the openings of the staple cartridge, so that the pin feet of the staples are fully bent, the suturing is more reliable, and the anastomosis effect is better.
In addition, the nail anvil assembly provided by the invention has an exquisite structure and enough space for clamping, the insertion or separation of the nail anvil and the puncture shaft is not affected when the nail anvil is clamped, the elastic locking piece is not easily deformed by external force to affect the operation, and the efficient operation is ensured. The nail anvil head, the injection molding rod body and the positioning ribs of the nail anvil assembly are integrally formed by injection molding, and the nail anvil assembly is provided with the metal wire bundling ring, so that the nail anvil assembly does not need to be prepared in two parts, and is simple in manufacturing process and low in cost.
Meanwhile, the medical instrument can be used for connecting the two butt joint parts smoothly and reliably in any state without damaging the service life of the parts and keeping the parts at the corresponding positions after connection by adopting the connecting mechanism, and the switching piece sleeved on the butt joint part is reasonable in structure, can be reliably and firmly butted with the butt joint part and drives the butt joint part to rotate.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The terms "upper", "lower", "left", "right", "inner", "outer", and the like in the present invention are merely used to describe the present invention with reference to the drawings, and are not intended to be limiting.
Referring to fig. 2 to 9, an end effector according to a preferred embodiment of the present invention includes a cartridge assembly 1 for accommodating staples and an anvil assembly 2 abutting against the cartridge assembly 1, wherein the cartridge assembly 1 has a cartridge opening 11 disposed opposite to the anvil assembly 2, the anvil assembly 2 has a pit 21 abutting against the cartridge opening 11, the pit 21 abuts against the legs of the staples to deflect the legs to one side with respect to the body of the staples during firing, and after the staples are formed, the projection of the legs onto the anvil assembly 2 falls into the cartridge opening 11.
In particular, in this embodiment, the end effector is annular for mounting on a tubular stapler. The staple pit 21 includes a first pit 211 and a second pit 212, and when firing, two legs of the staple are respectively held in the first pit 211 and the second pit 212, and the first pit 211 and the second pit 212 respectively bend the two legs of the staple toward the shank direction. The first recess 211 and the second recess 212 are provided with a first inclined edge 213 and a second inclined edge 214, respectively, which are opposite to each other, and when the staple is fired, the first recess 211 and the second recess 212 bend two legs of the staple, and the two legs are bent to be staples along the first inclined edge 213 and the second inclined edge 214, respectively, so as to be offset to one side with respect to the staple body.
The cartridge opening 11 of the present embodiment is located on the working surface 10 of the cartridge assembly 1, during the firing process, the staples are pushed out from the cartridge opening 11, preferably with the shaft in the same plane as the working surface 10, while in other embodiments, the shaft plane may be raised or recessed in the working surface 10, particularly in relation to the position of the staple pusher in the staple cartridge, but for facilitating the stapling, the present embodiment is preferred. The positions of the pins from the first concave pit 211 and/or the second concave pit 212 are defined as the pin outlets 210, and the distance between the two pin outlets 210 of the same pin pit 21 is defined as the pin outlet distance L. In order to ensure that the legs of the staples are sufficiently bent after stapling, the staple pitch L plus the diameter of the staples is less than the width W of the cartridge opening 11. And, the staple pitch L needs to be larger than the diameter of the staples to ensure that the staples can be fired from the pockets 21. Through the arrangement, the nail feet of the anastomotic nail can be propped against and enter the nail bin opening 11 in the firing process, and the nail body of the anastomotic nail and the working surface 10 are positioned on the same plane, so that the nail feet are fully bent when entering the nail bin opening 11.
In another embodiment, it will be appreciated by those skilled in the art that the staple pusher, titanium staple size, etc. of the end effector for the stapler require precise design, and the staple foot after stapling may be in the same plane as the staple shaft only, i.e., the staple foot, staple shaft, and working surface, given the uncomfortable effect of the large size component structures on the patient. Thus, the stapling effect of the stapling nail is good, and the size of the device can be reduced.
In this embodiment, the anvil assembly 2 includes an anvil head 22 and an anvil rod 23 disposed on the anvil head 22, where the anvil rod 23 includes an injection molding rod 24 formed by extending downward from the anvil head 1, and a metal rod 25 with one end embedded on the injection molding rod 24. The metal rod body 25 is provided with a metal binding part 26, a metal clamping part 27, a plurality of positioning ribs 28 between the metal binding part 26 and the metal clamping part 27, an annular elastic locking piece 231 sleeved on the outer circumference of the nail anvil rod 23, and an inserting cavity 29 which is formed in one end far away from the nail anvil head 22 and is used for being inserted with the puncture shaft 3. The metal binding portion 26, the positioning rib 28, the metal clamping portion 27, and the elastic locking piece 231 are sequentially disposed on the metal rod 25.
The metal rod 25 is formed with a first ring 251 and a second ring 252 protruding outwards, and specifically, the first ring 251 and the second ring 252 are formed by extending outwards from the outer circumference of the metal rod 25, and the diameters of the first ring 251 and the second ring 252 are the same. The first ring 251, the second ring 252, and the metal rod 25 are surrounded to form a metal wire tying portion 26, and the metal wire tying portion 26 is close to the anvil head 1.
The metal rod 25 is formed with a third ring 253 and a fourth ring 254 protruding outwards, and specifically, the third ring 253 and the fourth ring 254 are formed by extending outwards from the outer circumference of the metal rod 25, and the diameters of the third ring 253 and the fourth ring 254 are the same. The third ring 253, the fourth ring 254 and the metal rod 25 are surrounded to form a metal clamping part 27. The metal clamping part 27 is remote from the anvil 22 relative to the metal wire tying part 26 and the metal clamping part 24 is located outside the plugging cavity 29.
The metal rod 25 is provided with a plurality of openings 255, the openings 255 are located between the second ring 252 and the third ring 253, and the plurality of openings 255 can be arranged at equal intervals in the circumferential direction of the metal rod 25. The plurality of openings 255 are used for forming positioning ribs 28 by flowing injection molding liquid out of the plurality of openings 255 during injection molding, specifically, the injection molding liquid extends from the injection molding rod body 24 along the longitudinal direction of the metal rod body 25 along the opening 255 to form a plurality of positioning ribs 28, and the nail anvil 22, the injection molding rod body 24 and the positioning ribs 28 are integrally injection molded. Each of the positioning ribs 28 includes a first end 281 and a second end 282 disposed opposite to each other along the longitudinal direction of the metal rod 25, the first end 281 being located on the outer circumferential surface of the metal rod 25 and extending below the second circular ring 252, and the second end 231 being located on the outer circumferential surface of the metal rod 25 and extending above the third circular ring 253. The diameter of the second circular ring 252 is larger than that of the third circular ring 253, the diameter of the outer circle formed by the first end 281 is the same as that of the second circular ring 252, the diameter of the outer circle formed by the second end 282 is the same as that of the third circular ring 253, so that the diameter of the outer circle formed by the first end 281 is larger than that of the outer circle formed by the second end 282, and the design is favorable for smooth butt joint of the nail anvil assembly and other assemblies. The number of the positioning ribs 28 is set to 6 in this embodiment, and indeed, in other embodiments, the number of the positioning ribs may be set to 4 to 8.
The metal rod body 25 is inserted into the nail anvil 22, and the metal rod body 25 is provided with a plurality of injection holes 250 at a position contacting with the nail anvil 22, and the injection holes 250 may be arranged at equal intervals in the circumferential direction of the metal rod body 25. The injection holes 250 facilitate the formation of the injection rod 24 when the anvil assembly is injection molded and prepared, and injection fluid flows through the injection holes 250.
The outer circumference of the nail anvil rod 23 is sleeved with an annular elastic locking piece 231, the nail anvil rod 23 is penetrated with a lock hole 230 communicated with the inserting cavity 29, the lock hole 230 is in a round table shape, and an opening, close to the inserting cavity 29, in the lock hole 230 is smaller than an opening, close to the elastic locking piece 231. A clamping block 232 is disposed in the locking hole 230, the clamping block 232 has a first end (not numbered) abutting against the inner wall of the elastic locking member 231 and a second end (not numbered) extending into the plugging cavity 29, and a cross-sectional area of the first end is larger than that of the second end. The portion of the locking hole 230 near the plugging cavity 29 interferes with the clamping block 232 to limit the clamping block 232 to fall into the plugging cavity 29, and in this embodiment, the clamping block 232 may be fixedly connected with the inner wall of the elastic locking member 231 to limit the clamping block 232 to fall into the plugging cavity 29.
In this embodiment, the number of the clamping blocks 232 is one, the elastic locking member 231 has an opening (not shown), and the positions of the clamping blocks 232 abutting against the elastic locking member 231 are symmetrically arranged with the opening in the axial direction of the elastic locking member 231. Indeed, in other embodiments, the number of the clamping blocks 232 may be plural, the plurality of clamping blocks 232 are disposed in the corresponding locking holes 230, and the positions of the clamping blocks 232 abutting against the elastic locking members 231 are arranged at equal intervals with the openings.
Indeed, in the second embodiment of the present invention shown in fig. 5, the portion of the locking hole 2-2 of the anvil rod 2-1, which is close to the plugging cavity 2-3, and the locking block 2-4 do not need to interfere with each other to limit the whole of the locking block 2-4 to fall into the plugging cavity 2-3, the locking hole 2-2 communicating with the plugging cavity 2-3 is penetrated on the outer circumference of the anvil rod 2-1, the locking block 2-4 is provided in the locking hole 2-2, one end of the locking block 2-4 is fixed on the elastic locking piece 2-5, the other end of the locking block extends into the plugging cavity, specifically, the locking block 2-4 has a cylindrical structure, a first end (not numbered) fixed on the inner wall of the locking piece and a second end (not numbered) extending into the plugging cavity, and the cross-sectional area of the first end is larger than that of the second end.
Referring to fig. 9, the outer circumference of the piercing shaft 3 is concavely formed with an annular groove 31, when the anvil assembly is connected with the piercing shaft 3, and the piercing shaft 3 enters the anvil rod 2, the piercing shaft 3 moves the clamping block 232 from the inserting cavity 29 to drive the elastic locking member 231 to deform, when the annular groove 31 moves to the clamping block 232, the restoring deformation of the elastic locking member 231 drives the clamping block 232 to enter the inserting cavity 29, and the anvil assembly is connected with the piercing shaft 3. Conversely, the separation of the anvil assembly from the piercing shaft 3 can be easily accomplished.
In this embodiment, the number of the groups of the nail pits 21 and the nail bin openings 11 is two, and the number of the specific nail pits 21 and the nail bin openings 11 in each group can be selected according to actual needs. And the nail pits 21 and the nail bin openings 11 are respectively distributed on the nail anvil component 2 and the nail bin component 1 in concentric circles.
Referring to fig. 10 to 15, in another embodiment of the present invention, the end effector of the previous embodiment is applied to a tubular stapler, the tubular stapler includes a working head, a shaft assembly connected to the working head, and the end effector of the previous embodiment is connected to the shaft assembly, and a driving device (not shown) for driving the shaft assembly to work is disposed in the working head. Indeed, in other embodiments, the end effector may be used in a linear stapler, where the anvil assembly and cartridge assembly are provided with four or six sets of linearly disposed staple pockets and cartridge openings, respectively.
Specifically, in this embodiment, the electric-controlled circular stapler 10 is taken as an example of the medical apparatus and instrument, and the circular stapler 10 includes a housing 100, a power input device (not shown) for providing power, a cartridge assembly 101 disposed on the housing 100, an anvil assembly 102 for completing the suturing in cooperation with the cartridge assembly 101, a closing drive assembly 103 and a firing drive assembly 104 connected with the cartridge assembly 101, and a connecting mechanism 105 for connecting the power input device with the closing drive assembly 103 and the firing drive assembly 104. The closure drive assembly 103 includes a closure shaft 1031 that drives the closure drive assembly 103. The firing drive assembly 104 includes a firing shaft 1041 that drives the firing drive assembly 104. The power input device includes a power input shaft 106 that transmits power, a first gear 1061 that is fitted around the power input shaft, and a second gear 1062 that meshes with the first gear 1061. The power input shaft 106 drives the first gear 1061 to rotate, and the first gear 1061 drives the second gear 1062 to rotate in opposite directions. The present embodiment includes two sets of connection mechanisms 105, a first set of connection mechanisms 1051 connecting the gear shaft of the first gear 1061 of the power input shaft 106 (i.e., the power input shaft 106) with the firing shaft 1041, and a second set of connection mechanisms 1052 connecting the gear shaft of the second gear 1062 of the power input shaft 106 with the closure shaft 1031 to effect transmission of power to the closure drive assembly 103 or transmission of power to the firing drive assembly 104. The power input device is a motor. The firing shaft 1041 and the closure shaft 1031 are actuation drive shafts. Specifically, when the first set of connection mechanism 1051 connects the gear shaft of the first gear 1061 of the power input shaft 106 with the firing shaft 1041, the power input device drives the power input shaft 106 to rotate, and the power input shaft 106 drives the firing shaft 1041 to move at the same time to fire the circular stapler 10. When the second set of connection mechanisms 1052 connects the gear shaft of the second gear 1062 of the power input shaft 106 with the closing shaft 1031, the rotation of the power input shaft 106 drives the second gear 1062 to rotate due to the meshing of the first gear 1061 and the second gear 1062, so that the gear shaft of the second gear 1062 drives the closing shaft 1031 to move, and the movement of the cartridge assembly 101 is realized to close or open the circular stapler 10. It should be noted that, the firing and movement of the cartridge module 101 of the circular stapler 10 are not performed simultaneously, i.e., the first set of connection mechanisms 1051 connects the gear shaft of the first gear 1061 with the firing shaft 1041, and the second set of connection mechanisms 1051 connects the gear shaft of the second gear 1062 with the closing shaft 1031.
Referring to fig. 12, in the electronically controlled circular stapler 10 according to an embodiment of the present invention, a first set of connection mechanisms 1051 and a second set of connection mechanisms 1052 are identical in structure, and the second set of connection mechanisms 1052 (hereinafter referred to as connection mechanisms) are described in detail below, wherein the connection mechanisms 1052 include a first docking portion 1, a second docking portion 2 disposed parallel to the first docking portion 1, and a switching member 3 sleeved between the first docking portion 1 and the second docking portion 2. One end of the switching piece 3 is internally meshed with the second butting part 2, the other end of the switching piece is butted with the first butting part 1, and the switching piece 3 can move on the second butting part 2 relative to the first butting part 1 so that the switching piece 3 is partially sleeved on the first butting part 1 or separated from the first butting part 1. The switching member 3, the first abutting portion 1, and the second abutting portion 2 are coaxial. In the present embodiment, the first abutting portion 1 of the second set of connection mechanism 1052 is connected to the second gear 1062, and the second abutting portion 2 is connected to the closing shaft 1031.
Referring to fig. 13, the switching member 3 is a hollow cylinder, a butt joint cavity 31 with a circular cross section and a plurality of butt joint blocks 32 extending inwards from the side wall of the butt joint cavity 31 are formed in the switching member 3, and a butt joint groove 33 is formed between two adjacent butt joint blocks 32. The number of the butt joint blocks 32 is odd, in this embodiment, the number of the butt joint blocks 32 is 3, the thickness of the butt joint blocks 32 is moderate, the structure of the switching piece 3 is reasonable, and the switching piece 3 and the first butt joint part 1 are sleeved and connected to reliably and firmly drive the first butt joint part 1 to rotate.
Referring to fig. 14, the first abutting portion 1 includes a second post 11, a post 12 protruding outward from a front end surface of the second post 11 in an axial direction, and a plug 13 provided on the second post 11. In this embodiment, a through hole 14 is formed in a side wall of the second cylinder 11, and the through hole 14 penetrates the first abutting portion 1 in a radial direction. The plug 13 is in an isosceles trapezoid, the plug 13 is inserted into the through hole 14, and the plug 13 protrudes out of the through hole 14, that is, the width of the plug 13 is larger than the depth of the through hole 14, and the depth of the through hole 14 is the diameter of the second cylinder 11. The plug 13 is movable in the radial direction of the second cylinder 11 in the through hole 14. In order to prevent the plug 13 from falling off, an elongated hole 15 extending in the radial direction of the first abutting portion 1 is formed in the plug 13, a stopper 16 inserted into the elongated hole 15 is disposed in the through hole 14, in this embodiment, the stopper 16 is a rod body disposed perpendicular to the through hole 14, and two ends of the rod body are respectively inserted into the second cylinder 11.
The plug 13 may be received in a portion of the mating recess 33, and when the switching member 3 is sleeved on the first mating portion 1, the plug 13 may be pressed by the mating block 32 to move radially toward the first mating portion 1. Specifically, when the switching member 3 is mated with the first docking portion 1, the upper end and the lower end of the plug member 13 enter the docking groove 33, or one end of the plug member 13 enters the docking groove 33, and the other end of the plug member is in contact with the docking block 32, at this time, the plug member 13 is pressed by the docking block 32 to move the plug member 13 along the radial direction of the first docking portion 1 toward the docking groove 33 docked with the plug member 13, so that the switching member 3 is smoothly sleeved in the first docking portion 1. In order to tightly fit the plug 13 with the switching element 3, in this embodiment, the width of the plug 13 is larger than the diameter of the inner circle formed by the plurality of butting blocks 32, and the axial distance from the point of the maximum displacement of the plug 13 to the first butting portion 1 is smaller than the radius of the inner circle formed by the plurality of butting grooves 33. In this embodiment, the plug 13 is formed with a first guiding surface 131 facing the switching member 3, the docking block 32 is formed with a second guiding surface 321 cooperating with the first guiding surface, and the docking between the plug 13 and the switching member 3 is facilitated by cooperation between the first guiding surface 131 and the second guiding surface 321. In other embodiments, only the first guide surface 131 or the second guide surface 321 may be provided.
In this embodiment, since the number of the butt joint blocks 32 is 3 at equal intervals, when the butt joint is not performed, two ends of the plug 13 protrude from the first butt joint portion 1. When the switching member 3 is moved on the second docking portion 2 toward the first docking portion 1, one end of the plug member 13 faces one of the docking grooves 33 (for convenience of description, this end will be referred to as a first end), and the other end faces the docking block 32 (for convenience of description, this end will be referred to as a second end), at this time, the first end will be received in this corresponding docking groove 33, and the second end, due to interference with the docking block 32, when the switching member 3 is fitted over the first docking portion 1, the docking block 32 generates a force on the second end, so that the plug member 13 moves toward the first end, and the second end moves into the elongated hole 15, thereby completing docking of the switching member 3 with the first docking portion 1, at this time, since the first end is received in the docking groove 33, the side wall of the first end interferes with the side wall of the docking block 32 adjacent to the docking groove 33 where it is received, so that, when the first docking portion 1 rotates, it can drive the switching member 3 to rotate.
In this embodiment, the width of the docking groove 33 is adapted to the thickness of the plug 13, so when the plug 13 is inserted into the docking groove 33, the plug 13 will not move relative to the docking groove 33 under the driving of the power input shaft 106, but if the width of the docking groove 33 is greater than the thickness of the plug 13, the plug 13 will move a certain distance in the docking groove 33 when the power input shaft 106 drives the second gear 1062 to initially rotate, but the cooperation of the first docking portion 1 and the switching member 3 will not be affected.
In addition to this embodiment, in other embodiments, the manner of setting the plug connector may be:
In the first setting mode, an opening for accommodating the plug connector can be formed in the side wall of the first butt joint part, an elastic piece for pushing the plug connector towards the outside of the first butt joint part is arranged in the opening, the elastic piece can be a spring, one end of the spring is fixed on the plug connector, and the other end of the spring is fixed on the side wall of the opening. In order to prevent the plug from being removed entirely from the opening, one end of the plug may be hinged to the first abutment or the spring force may be arranged such that its force exerted on the plug cannot push the plug entirely out of the opening. When the switching piece is sleeved on the first butt joint part, the plug-in piece can be extruded by the butt joint block, and the elastic piece connected with the plug-in piece contracts, so that the switching piece is sleeved with the first butt joint part without barriers. The number of the connectors may be one or more. The distance between the center of the circle of each plug connector and the first butt joint part is between the radius of the inner circle formed by the butt joint blocks and the radius of the inner circle formed by the butt joint grooves.
In the second arrangement mode, a spring piece is arranged on the side wall of the first butt joint part, one end of the spring piece is fixed on the side wall of the first butt joint part, the other end of the spring piece is bent, and the bending direction extends towards the direction away from the switching piece. When the switching piece is sleeved on the first butt joint part, the elastic sheet is flattened, so that the switching piece is sleeved with the first butt joint part without barriers. The number of the elastic sheets can be one or more. The distance between the elastic piece and the circle center of the first butt joint part is between the radius of the inner circle formed by the butt joint blocks and the radius of the inner circle formed by the butt joint grooves.
In the two arrangement modes, the arrangement mode of the butt joint block and the plug connector can be the same as that of the embodiment, or the plug connector is only provided with one, if the plug connector is provided with the elastic piece or is the elastic piece, the plug connector always protrudes out of the second column when not pressed by the butt joint block, so that the plug connector can be finally contained in one of the butt joint grooves no matter what the butt joint position between the first butt joint part and the switching piece is at first, or the plug connector is provided with more than two, and similarly, the plug connector is provided with the elastic piece or is the elastic piece, so that the plug connector always protrudes out of the second column when not pressed by the butt joint block, and therefore, no matter what the butt joint position between the first butt joint part and the switching piece is at first, one plug connector is necessarily contained in one of the butt joint grooves.
Referring to fig. 13 and 15, in the present embodiment, the docking cavity 31 extends along the axial direction of the replacing member 3 and penetrates the replacing member 3, and the docking groove 33 of the docking block 32 extends from one end of the docking cavity 31 toward the first end and penetrates the docking cavity 31. The second abutting portion 2 includes a first cylinder 21, an engagement portion 22 provided on an outer circumferential surface of the first cylinder 21, and a cylindrical hole 23 formed concavely from a front end surface of the first cylinder 21. The convex column 12 is inserted into the cylindrical hole 23, and the convex column 12 and the cylindrical hole 23 are in clearance fit, the convex column 12 can rotate in the cylindrical hole 23, and the first butt joint part 1 and the second butt joint part 2 are connected through the fit of the convex column 12 and the cylindrical hole 23, so that the axis of the first butt joint part 1 and the axis of the second butt joint part 2 are overlapped, and the butt joint of the switching piece 3 and the first butt joint part 1 is facilitated. In this embodiment, the engaging portion 22 is formed by protruding a plurality of protruding strips 221 radially outwards from the outer circumference of the first column 21, and the number of the protruding strips 221 is the same as that of the butting blocks 32, and is 3. When the switching piece 3 is engaged with the second abutting portion 2, each protruding strip 221 is inserted into one abutting groove 33 correspondingly. By this arrangement, the structure of the switching member 3 is simplified, and the switching member 3 is identical to the abutting structure of the first abutting portion 1 and the second abutting portion 2, and also contributes to reduction in the overall volume.
In summary, the end effector and the medical instrument of the invention enable the pin feet of the staples to be misplaced into the staples by arranging the pin pits, and the pin feet of the staples are propped until the projections of the pin feet fall into the mouth of the staple cartridge, so that the pin feet of the staples of each finished staple are fully bent, the suturing is more reliable, and the anastomosis effect is better.
In addition, the nail anvil assembly provided by the invention has an exquisite structure and enough space for clamping, the insertion or separation of the nail anvil and the puncture shaft is not affected when the nail anvil is clamped, the elastic locking piece is not easily deformed by external force to affect the operation, and the efficient operation is ensured. The nail anvil head, the injection molding rod body and the positioning ribs of the nail anvil assembly are integrally formed by injection molding, and the nail anvil assembly is provided with the metal wire bundling ring, so that the nail anvil assembly does not need to be prepared in two parts, and is simple in manufacturing process and low in cost.
Meanwhile, the medical instrument can be used for connecting the two butt joint parts smoothly and reliably in any state without damaging the service life of the parts and keeping the parts at the corresponding positions after connection by adopting the connecting mechanism, and the switching piece sleeved on the butt joint part is reasonable in structure, can be reliably and firmly butted with the butt joint part and drives the butt joint part to rotate.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.