JP3213926U - Medical stapler - Google Patents

Abstract

[PROBLEMS] To provide a medical stapler that ensures that a cutter holder is smoothly pulled out in a process in which a needle push rod moves to a proximal end of a medical stapler. A needle push rod and a cutter holder disposed at the tip of the needle push rod are provided. The needle push rod has a convex portion protruding from the needle push rod, and a hook protruding from the end surface 3262 is provided on the end surface 3262 near the needle push rod of the cutter holder. The convex portion and the hook are fitted, so that the convex portion moves the cutter holder to the proximal end of the medical stapler when the needle push rod moves to the proximal end of the medical stapler. The needle push rod and the cutter holder according to the present invention cooperate with each other via the convex portion and the hook, and the convex portion and the hook are separated in the process of moving the needle push rod to the proximal end of the medical stapler. Thus, the needle push rod is ensured to smoothly pull out the cutter holder in the process of moving to the proximal end, and the structure is simple. [Selection] Figure 13

Description

  This application claims the priority of the Chinese application filed with the Chinese Patent Office on Dec. 30, 2014 (application number 20144208567.4, the title "medical stapler"), all of which are Included in this application by reference.

  The present invention relates to the technical field of manufacturing medical devices, and more particularly to a medical stapler (anastomator).

  A stapler is a medical device that is frequently used when performing surgery on a living tissue such as the intestine, and is an instrument that is used in medicine instead of a conventional hand-sewn operation. With the development of advanced technology and the improvement of production technology, clinical staplers are currently high quality, easy to use, and appropriate in precision and tightness. In particular, the stapler has a fast stitching speed, is easy to operate, and has few advantages such as side effects and surgical complications. In some cases, it is possible to remove a lesion site for a tumor that could not be excised so far, and it has been patronized and recommended by domestic and foreign clinical surgeons.

  At present, after the cutting operation of the stapler is completed, the cutter fixed to the cutter holder must be pulled back by the needle push rod. As shown in FIGS. 1 to 3, the cutter 302 is fixed to the cutter holder 300, the cutter holder 300 has a concave groove 301, and the needle push rod 200 is provided with a hook member (not shown) at its end 201. The needle push rod 200 can move the cutter holder 300 to the proximal end of the stapler. However, the structure of such a cutter holder and a needle push rod is complicated.

  An object of the present invention is to provide a medical stapler that ensures that the cutter holder is pulled out smoothly in the process in which the needle push rod moves to the proximal end of the medical stapler.

  In order to achieve one of the objects of the above invention, the present invention provides a medical stapler including a needle push rod and a cutter holder disposed at the tip of the needle push rod. The needle push rod has a protrusion protruding from the needle push rod, and a hook protruding from the end face is provided on an end face of the cutter holder close to the needle push rod. The convex portion and the hook are fitted, whereby when the needle push rod moves to the proximal end of the medical stapler, the convex portion moves the cutter holder to the proximal end of the medical stapler. Move.

  As a further improvement of an embodiment of the present invention, the needle push rod includes an end portion relatively provided with a first surface and a second surface. The convex portion protrudes from at least one of the first surface and the second surface.

  As a further improvement of an embodiment of the present invention, the convex portion is formed by cutting and bending the end portion.

  As a further improvement of an embodiment of the present invention, an accommodation space in which the convex portion is accommodated is formed between the hook and the end surface.

  As a further improvement of an embodiment of the present invention, the hook includes a connection portion and a contact portion, and the connection portion is connected to the contact portion and the end surface to form the accommodating space.

  As a further improvement of an embodiment of the present invention, the convex portion includes a first side surface facing a proximal end of the medical stapler, and the contact portion is a contact surface facing the distal end of the medical stapler. including. In the process of moving the needle push rod to the proximal end of the medical stapler, the first side surface and the contact surface are kept in contact and relative stationary.

  As a further improvement of an embodiment of the present invention, the convex portion includes a second side surface that faces the distal end of the medical stapler and is kept in contact with the end surface.

  As a further improvement of an embodiment of the present invention, the convex portion includes a third side surface facing the connecting portion and maintaining contact with the connecting portion.

  As a further improvement of an embodiment of the present invention, a first angle that is an acute angle or a right angle is provided between the connection portion and the contact portion.

  As a further improvement of an embodiment of the present invention, the contact portion is an elastic contact portion.

  Compared with the prior art, the needle push rod and the cutter holder according to the present invention cooperate with each other via the convex portion and the hook, and in the process of moving the needle push rod to the proximal end of the medical stapler, The convex portion and the hook are not separated, and thereby, the needle push rod is ensured to smoothly pull out the cutter holder in the process of moving to the proximal end, and there is a beneficial effect that the structure is simple.

It is a structure schematic of the needle push rod in a prior art. It is the structure schematic of the cutter holder in a prior art, a cutter, and a needle press board. It is the structure schematic which the needle push rod in a prior art, the cutter holder, and the needle push plate couple | bonded. 1 is a schematic configuration diagram of one embodiment of a medical stapler according to the present invention. 1 is an exploded schematic view of a staple cartridge assembly and a staple anvil assembly in one embodiment of a medical stapler according to the present invention. 1 is a schematic exploded view of one embodiment of a medical stapler according to the present invention. It is a partial composition exploded view of one embodiment of a medical stapler concerning the present invention. It is a composition schematic diagram of a needle push rod in one embodiment of a medical stapler concerning the present invention. It is a partial composition schematic diagram of a needle push rod in one embodiment of a medical stapler concerning the present invention. It is the structure schematic of the cutter holder in one embodiment of the medical stapler which concerns on this invention. It is a partial composition section schematic diagram of one embodiment of a medical stapler concerning the present invention. It is the structure schematic which the needle push rod and cutter holder in one embodiment of the medical stapler concerning this invention couple | bonded. FIG. 13 is a schematic cross-sectional view taken along a line AA in FIG. 12.

  Hereinafter, the present invention will be described in detail in conjunction with specific embodiments shown in the drawings. In addition, these embodiment does not limit this invention. All structural, method or functional changes made by those skilled in the art based on these embodiments are intended to be within the scope of protection of the present invention.

  In order to clearly describe the positions and directions described in the present specification, the side closer to the operator is the base end and the side away from the operator is the front end, based on the operator of the device. In the present specification, the lower side of the stapler is a direction in which the grip handle extends from the housing, and the opposite direction to the lower side is defined as the upper side of the stapler.

  As shown in FIG. 4, in one embodiment according to the present invention, the stapler 100 includes a housing 10, a support structure 20 extending from the inside of the housing 10 to the tip, and a staple anvil connected to the tip of the support structure 20. A holder 30 is provided. The staple anvil holder 30 may be fixedly connected to the support structure 20 and has a circular cross section. A grip handle 40 is formed below the base end of the housing 10, and an opening 31 is formed at one end of the staple anvil holder 30. The stapler 100 further includes a staple cartridge assembly 32 and a staple anvil assembly 34. In the present embodiment, the staple cartridge assembly 32 and the staple anvil assembly 34 are removably attached to the staple anvil holder 30 and conform to the shape of the staple anvil holder 30. That is, the cross sections of the staple cartridge assembly 32 and the staple anvil assembly 34 are each formed in an arc shape, and therefore, anastomosis with respect to living tissue can be performed in a narrower operable space.

  As shown in FIG. 5, the staple cartridge assembly 32 has a staple cartridge 322. The staple cartridge 322 includes a staple cartridge surface (not shown) in which one or more rows of suture needle receiving grooves (not shown) are arranged in a staggered manner. The staple cartridge assembly 32 further includes a needle push plate 324 and a cutter assembly disposed within the staple cartridge 322. The needle push plate 324 can push the suture needle out of the suture needle receiving groove. The cutter assembly includes a cutter holder 326 and a cutter 328 attached to the tip of the cutter holder 326. Disposed within the staple cartridge assembly 32 is a staple cartridge cover 329 for blocking the suture needle and cutter 328 in the staple cartridge 322. This prevents needle leaks and cocking misoperations.

  The staple cartridge surface and the needle pusher plate 324 are each provided with a slit (not shown) adapted to the cutter 328 and supporting the cocking operation of the cutter 328. In the present embodiment, the suture needle receiving grooves are located on both sides of the slit, so that the suture can be performed simultaneously from both ends of the separated tissue in the process of cutting and suturing the tissue.

  Please refer to FIGS. In one embodiment according to the present invention, a staple anvil assembly 34 including a staple anvil 342 and a cutter anvil 344 is further connected to the distal end of the staple cartridge assembly 32. At the same time that the staple cartridge assembly 32 is attached to the staple anvil holder 30, the staple anvil 342 and the cutter anvil 344 are cooperatively attached to the staple anvil holder 30.

  The support structure 20 includes a pair of a left stand 22 and a right stand 24 that are relatively disposed. At the tip of each of the left stand 22 and the right stand 24, a pin hole in the staple anvil holder 30 and a mounting hole 222 and a mounting hole 242 that can correspond to a protrusion 302 provided in advance in the staple anvil holder 30 are provided. . Thereby, mutual fixation of the staple anvil holder 30 and the support structure 20 is realized.

  The other end of the support structure 20 is connected to the housing 10. Correspondingly, the housing 10 includes a left half housing 12 and a right half housing 14 connected to correspond to a left stand 22 and a right stand 24, respectively.

  The stapler 100 further includes a cocking assembly 50. The cocking assembly 50 includes a cocking handle 52 disposed below the stapler 100, a staple cartridge push rod 54 driven by the cocking handle 52, and a transmission member for connecting the cocking handle 52 and the staple cartridge push rod 54. Including. The staple cartridge push rod 54 moves the staple cartridge assembly 32 from the proximal end to the distal end of the stapler 100 so as to approach the staple anvil assembly 34 by the action of the cocking handle 52, and finally the staple cartridge assembly 32 and the staple anvil assembly 34. Can be driven to close. At this time, when a biological tissue is placed between the staple cartridge assembly 32 and the staple anvil assembly 34, the staple cartridge push rod 54 moves the staple cartridge assembly 32 closer to the staple anvil assembly 34 to close the biological tissue. Can be driven.

  In one embodiment according to the present invention, the transmission member includes a front connection rod 562 and a rear connection rod 564. The distal end of the front connection rod 562 and the staple cartridge push rod 54 are connected, the proximal end of the front connection rod 562 and the distal end of the rear connection rod 564 are connected, and the proximal end of the rear connection rod 564 is connected to the support structure 20. Has been.

  In order to guide the staple cartridge push rod 54 to move in a predetermined closing direction, the support structure 20 extends from the proximal end to the distal end of the stapler 100 and corresponds to the left stand 22 and the right stand 24, respectively. The second slide grooves 228 and 246 are provided. The staple cartridge push rod 54 is attached between the left stand 22 and the right stand 24. A second slide pin 561 that fits in the second slide grooves 228 and 246 is connected to the staple cartridge push rod 54. Accordingly, the staple cartridge push rod 54 cooperates with the second slide grooves 228 and 246 via the second slide pin 561 so as to be slidable. As a preferred embodiment, the second slide pin 561 is a pivot shaft for connecting the staple cartridge push rod 54 and the front connection rod 562. As a result, the second slide pin 561 is substantially improved and designed using the original structure of the stapler 100, and the complexity of increasing the configuration of the stapler 100 is avoided. Of course, in an alternative embodiment, the second slide pin 561 is not connected to a pivot shaft for connecting the staple cartridge push rod 54 and the front connecting rod 562, but to be connected to another suitable position in the staple cartridge push rod 54. May be designed.

  The staple cartridge push rod 54 is further provided with a first slide groove 542. A first slide pin 544 adapted to the first slide groove 542 is connected to the support structure 20, and the first slide groove 542 and the second slide grooves 228 and 246 are provided in parallel to each other. Specifically, the left stand 22 and the right stand 24 are provided with mounting holes 226 and 244 for fixing the first slide pin 544, respectively. The first slide pin 544 passes through the first slide groove 542 and cooperates with the first slide groove 542 so as to be slidable. Here, the stapler 100 in the present embodiment restricts the slide path of the staple cartridge push rod 54, and the first slide groove 542 and the first slide pin 544 that cooperate with each other, and the second slide groove 228, 246 and the second slide pin 561 are included, and the second slide pin 561 is closer to the proximal end of the stapler 100 with respect to the first slide groove 542.

  During the closing process of the stapler 100, the front connecting rod 562 applies an obliquely upward thrust to the staple cartridge push rod 54 during its pivoting, whereby the second slide pin 561 on the staple cartridge push rod 54 is moved. The upward component force of the diagonally upward thrust acts passively on the upper portions of the second slide grooves 228 and 246 of the left stand 22 and the right stand 24, and the second slide on the upper portions of the second slide grooves 228 and 246. It cancels out the reaction force applied to the pin 561. The second slide grooves 228 and 246 extend along the direction of movement of the staple cartridge assembly 32, while the first slide groove 542 is parallel to the two slide grooves 228 and 246. Accordingly, the front connecting rod 562 moves the second slide pin 561 along the extending direction of the second slide grooves 228 and 246, and at the same time, the first of the staple cartridge push rod 54 connected to the first slide pin 544 Movement in the direction limited by the slide groove 542 is also limited. At this time, a frictional force is not generated between the first slide pin 544 and the first slide groove 542 in the staple cartridge push rod 54, and the closing force when the instrument is closed is greatly reduced. Further, the front connecting rod 562 moves the second slide pin 561 in the second slide grooves 228 and 246 between the left stand 22 and the right stand 24, so that the stability and rigidity of the structure is ensured, and the instrument has a thick tissue. It is ensured that it closes smoothly inside. Thereby, the feeling of closure of the stapler 100 becomes better, and the structural stability of the stapler 100 is further improved.

  In the above embodiment, in order to optimize the cooperative relationship between the first slide pin 544 and the second slide pin 561, the first slide groove 542 and the second slide grooves 228 and 246 are rounded rectangular grooves. It is.

  The stapler 100 further includes an overflow prevention needle assembly. The overflow prevention needle assembly includes an overflow prevention needle push rod 62, a transmission push rod 64 connected to the overflow prevention needle push rod 62, and an overflow prevention needle 61 (see FIG. 5) penetrating through the staple cartridge assembly 32. Including. The overflow prevention needle 61 and the transmission push rod 64 are connected so as to be interlocked.

  In one embodiment according to the present invention, the overflow prevention needle push rod 62 is formed in a bowl shape, and a symmetrical operation portion is provided at the proximal end so as to protrude from the housing 10.

  The overflow prevention needle assembly further includes a rotating crank 66 connected to cooperate with the overflow prevention needle push rod 62. The rotating crank 66 is pivotally connected to the stand 20 and is movably connected to the staple cartridge push rod 54. The overflow prevention needle push rod 62 can be pushed from the proximal end to the distal end of the stapler 100 via the operation portion of the overflow prevention needle push rod 62, and the transmission push rod 64 is moved by pushing the overflow prevention needle push rod 62 forward. The overflow prevention needle 61 is moved toward the leading end of the stapler in conjunction with the leading end.

The operation process when the stapler 100 according to one embodiment of the present invention closes the living tissue is as follows.
In the initial state of the stapler 100, an angle smaller than 180 degrees is formed between the front connection rod 562 and the rear connection rod 564, and the connection portion between the front connection rod 562 and the rear connection rod 564 is in the cocking handle 52. It abuts on the support portion 522.

  When it is necessary to close the living tissue, the living tissue is first placed between the staple anvil surface of the staple anvil assembly 34 and the staple cartridge surface of the staple cartridge assembly 32, and then the overflow prevention needle push rod 62 is placed at the tip of the stapler. As a result, the push rod 64 and the overflow prevention needle 61 move together toward the tip of the stapler, and the overflow prevention needle 61 extends from the staple cartridge assembly 32. Finally, the staple In cooperation with a receiver (not shown) provided on the anvil assembly 34, the opening between the staple anvil assembly 34 and the staple cartridge assembly 32 is closed. That is, the opening of the staple anvil holder 30 is closed.

  Next, the cocking handle 52 is driven to pivot toward the grip handle 40. At this time, the support portion 522 comes into contact with the connection portion between the front connection rod 562 and the rear connection rod 564, whereby the front connection rod 562 and the rear connection rod 564 are forcibly pivoted relative to each other. The angle is displaced so as to increase.

  In one embodiment according to the present invention, the front connecting rod 562 and the rear connecting rod 564 are driven by the support portion 522 to form an angle slightly larger than 180 degrees, and are relatively stable in a cooperative state. And finally abuts against the abutment 224 of the support structure 20. At this time, the front connection rod 562 and the rear connection rod 564 are displaced to the interference state.

  In this process, the limited distance between the front end of the front connection rod 562 and the base end of the rear connection rod 564 gradually increases to the maximum distance and then slightly decreases again. Since the proximal end support structure 20 of the rear connection rod 564 is fixed, the front end of the front connection rod 562 and the staple cartridge push rod 54 are moved toward the front end of the stapler, and the staple cartridge push rod 54 is moved to the staple cartridge assembly 32. The applied driving force forces the staple cartridge assembly 32 to approach the staple anvil assembly 34 and further closes the living tissue.

  In one embodiment according to the present invention, the cocking assembly 50 further includes a needle push rod 58 slidably mounted within the staple cartridge push rod 54. The needle push rod 58 and the surface on which the cutter holder 326 acts are made in a shape that is compatible with each other.

  In the present embodiment, the cross section of the needle push rod 58 has an arc shape.

  At least a part of the cocking handle 52 is mounted in the staple cartridge push rod 54, and a wedge-shaped piece 524 that can interact with the needle push rod 58 is connected thereto.

The operation process when the stapler 100 in one embodiment according to the present invention cuts and sutures the living tissue is as follows.
After the operation for closing the living tissue is completed, the cocking handle 52 is rotated in a direction away from the grip handle 40 by driving a handle return spring (not shown) to realize automatic position return of the cocking handle 52. .

  In this process, the wedge-shaped piece 524 in the cocking handle 52 is guided to contact the needle pushing rod 58. At this time, by pivoting the cocking handle 52 toward the grip handle 40, the wedge-shaped piece 524 pushes and moves the needle push rod 58 to the tip of the stapler, thereby the cutter 328 and the needle. Simultaneous cocking with respect to the push plate 324 is realized, and the needle push plate 324 pushes and moves the suture needle in the suture needle receiving groove firmly into the living tissue, and at the same time, the cutter 328 cuts the corresponding living tissue.

  The proximal end of the needle push rod 58 has a lock portion 582 that extends to the outside of the staple cartridge push rod 54. The cocking assembly further includes a position return elastic element 59 connected between the lock 582 and the support structure 20. In one embodiment of the present invention, the position return elastic element 59 is a tension spring.

  In the process in which the needle push rod 58 is cocked, the position return elastic element 59 is placed in the extended state, and when the stapler is placed in the cocking state, that is, after cutting and suturing the living tissue, the position return elastic element 59 is placed. Can pull back the needle pushing rod 58 by the action of its own tensile force, and at the same time, can pull back the cutter holder 326 to which the cutter 328 is attached. With this, the stapler completes all the cocking processes and reaches the cocking completion state.

  After the stapler reaches the cocking complete state, pressing the release button 70 opens the closed staple cartridge assembly 32 and staple anvil assembly 34.

  In one embodiment according to the present invention, the release button 70 is movably connected to the support structure 20 via the release button pin 702, and the proximal end of the rear connection rod 564 is also connected to the release button pin 702. Relative fixation with the support structure 20 is realized.

  The distal end of the release button 70 has a contact end 704 that can act on the rear connection rod 564. When the release button 70 is pressed, the contact end 704 moves the front connection rod 562 and the rear connection rod 564 so as to form an angle smaller than 180 degrees. That is, the connection portion of the front connection rod 562 and the rear connection rod 564 moves downward of the stapler, thereby destroying the stable cooperative state between the front connection rod 562 and the rear connection rod 564, Further, the staple cartridge push rod 54 and staple cartridge assembly 32 are pulled back to their relative proximal ends and the instrument is removed from the surgical site.

  If the stapler needs to be used again, it can be replaced with a new staple cartridge assembly 32 and / or staple anvil assembly 34 for subsequent cutting and stitching. In replacing and using the staple cartridge assembly 32, the principles to be followed are as follows. The cutter holder 326 and the needle pusher plate 324 in the staple cartridge assembly 32 that are not used must be held in the retracted position in the staple cartridge 322. As the suture needle and cutter 328 in the staple cartridge assembly 32 is cocked, the needle pusher plate 324 must be held in a cocked position so that the front end is visible, thereby allowing the user to staple the staple cartridge assembly 32. Can provide visual suggestions that have already been used. The cutter holder 326 must be retracted and held inside the staple cartridge 322 so that the blades of the cutter 328 connected to the cutter holder 326 are not exposed to the outside of the staple cartridge 322 after completion of all cocking processes. . Further, on one side wall of the staple cartridge 322, there are provided visualization windows 3222 and 3224 for observing the positions of the needle push plate 324 and the cutter holder 326, respectively, and judging the use state of the staple cartridge assembly. This increases the usability of the stapler.

  Please refer to FIGS. In one embodiment according to the present invention, the needle push rod 58 has a convex portion 582 that protrudes from the needle push rod 58, and the end surface 3262 close to the needle push rod 58 of the cutter holder 326 protrudes from the end surface 3262. A hook 3261 is provided. The convex portion 582 and the hook 3261 are fitted, so that when the needle push rod 58 moves to the proximal end of the medical stapler, the convex portion 582 moves the cutter holder 326 to the proximal end of the medical stapler. Acts on the hook 3261 as described above.

  In the present embodiment, an end portion 581 is provided at the tip of the needle push rod 58, and the convex portion 582 is formed by cutting and bending the end portion 581. That is, the convex portion 582 and the needle push rod 58 are integrally formed. A first surface 5811 and a second surface 5812 are relatively provided at the end 581. The convex portion 582 protrudes from at least one of the first surface 5811 and the second surface 5812. Thereby, the process is simple, and the connection strength between the convex portion 582 and the needle push rod 58 becomes better.

  In the present embodiment, the end 581 at the tip of the needle push rod 58 is an arcuate end. Both the first surface 5811 and the second surface 5812 are arcuate surfaces, the first surface 5811 is an inner surface, and the second surface 5812 is an outer surface. In the present embodiment, the convex portion 582 protrudes from the first surface 5811. That is, the convex portion 582 is formed by bending a part of the end portion 581 inward. The convex portion 582 is preferably a rectangular convex portion. In other embodiments, the protrusion 582 may protrude from the second surface 5812. That is, the convex portion 582 is formed by bending a part of the end portion 581 outward. The opening direction of the hook 3261 also changes correspondingly. The convex portion 582 may protrude from both the first surface 5811 and the second surface 5812. For example, the end portion 581 of the needle push rod 58 is formed with a plurality of convex portions 582 that are separated from each other, and a part of the plurality of convex portions 582 protrudes from the first surface 5811, and in addition to the plurality of convex portions 582. This part protrudes from the surface 5812. The end surface 3262 of the cutter holder 326 is formed with a plurality of hooks 3261 that can be arranged in a staggered manner and whose opening direction corresponds to the plurality of convex portions 582. Thereby, the plurality of convex portions 582 are fitted into the plurality of hooks 3261, and the dimensions and positions of the plurality of convex portions 582 may be determined according to a specific situation.

  As shown in FIGS. 10 and 11, the convex portion 582 is accommodated between the hook 3261 and the end surface 3262 of the cutter holder 326, and is surrounded by the connection portion 3263, the abutting portion 3265, and the end surface 3262. An accommodation space 3267 is formed. The connection portion 3263 is located between the contact portion 3265 and the end surface 3262, and the contact portion 3265 and the end surface 3262 are not in contact with each other. In other embodiments, the hook 3261 and the cutter holder 326 may be integrally formed.

  In the present embodiment, the connection portion 3263 and the contact portion 3265 have a first angle that is an acute angle or a right angle. Thereby, the fitting of the convex portion 582 and the hook 3261 is more stable.

  In the present embodiment, as shown in FIGS. 8 to 13, the convex portion 582 includes a first side surface 5821, a second side surface 5822, a third side surface 5823 and a fourth side surface 5824. The first side surface 5821 and the second side surface 5822 are provided to face each other, and the third side surface 5823 and the fourth side surface 5824 are provided to face each other. As shown in FIG. 13, the first side surface 5821 of the convex portion 582 faces the proximal end of the medical stapler. The contact portion 3265 includes a contact surface 3266 that faces the end surface 3262. In the process in which the needle push rod 58 moves to the proximal end of the medical stapler, the first side surface 5821 and the contact surface 3266 are kept in contact with each other and in a stationary state. Accordingly, the convex portion 582 and the hook 3261 are stably fitted, whereby the cutter holder 326 moves to the proximal end together with the needle push rod 58 in the process of moving the needle push rod 58 to the proximal end of the medical stapler. It is ensured to move. The abutting portion 3265 may be a polygon such as a rectangle or a rectangle, but is not limited thereto.

  In the present embodiment, as shown in FIG. 13, the second side surface 5822 of the convex portion 582 faces the distal end of the medical stapler, and the entire second side surface 5822 and the end surface 3262 are kept in contact with each other. Accordingly, the first side surface 5821 and the second side surface 5822 provided relatively to the convex portion 582 come into contact with the contact surface 3266 and the end surface 3262, respectively, so that the needle push rod 58 and the cutter holder 326 are medically stapled. When moving in the direction of the proximal end or distal end, the convex portion 582 does not detach from the hook 3261, and the relative stationary state between the needle push rod 58 and the cutter holder 326 is further ensured.

  In the present embodiment, as shown in FIG. 9, the fourth side surface 5824 of the convex portion 582 faces the first surface 5811 of the needle push rod 58, and between the fourth side surface 5824 and the first surface 5811, A second angle α greater than 0 ° and smaller than 180 ° is formed. The second angle α is a refraction angle of the end portion 581 of the needle push rod 58, and is preferably an acute angle. It should be noted that both the first surface 5811 and the fourth side surface 5824 are arcuate surfaces, and the second angle α is substantially the angle between the cross section of the first surface 5811 and the fourth side surface 5824. .

  In the present embodiment, the connection portion 3263 of the hook 3261 includes a connection surface 3264 that faces the accommodation space 3267. The connecting portion 3263 may be provided so as to conform to the second angle α formed by the convex portion 582. That is, when the convex portion 582 is accommodated in the hook 3261, the angle between the connection surface 3264 and the cross section of the first surface 5811 is equal to the second angle α. When the convex portion 582 is accommodated in the hook 3261, the third side surface 5823 comes into contact with the connection surface 3264. Since the third side surface 5823 and the fourth side surface 5824 are relatively provided, the angle between the cross section of the third side surface 5823 and the cross section of the first surface 5811 is also substantially the second angle α. The third side surface 5823 and the connection surface 3264 can be almost completely in contact with each other, whereby the fitting between the convex portion 582 and the hook 3261 becomes more stable. Here, when the connection surface 3264 is set to an arcuate surface that fits the third side surface 5823, the third side surface 5823 and the connection surface 3264 can be in complete contact with each other.

The operation process of the needle push rod 58 and the cutter holder 326 in the present embodiment is as follows.
When the needle push rod 58 moves the cutter holder 326 to the tip of the medical stapler, the convex portion 582 is housed in the housing space 3267, so that the needle push rod 58 is placed on the medical stapler with respect to the cutter holder 326. Generate thrust to the tip of the. That is, the needle push rod 58 can cut and suture the tissue by pushing the needle push plate 324 and the cutter 328 in the cutter holder 326 closer to the tissue. After completion of the tissue cutting and suturing process, the needle push rod 58 needs to move the cutter holder 326 and cutter 328 to the proximal end of the medical stapler. When the needle push rod 58 moves the cutter holder 326 to the proximal end of the medical stapler, the convex portion 582 in this embodiment is designed to be locally bent, and the hook 3261 and the convex portion 582 are formed. The protrusions 582 do not detach from the hook 3261 and the needle push rod 58 pulls out the cutter holder 326 smoothly in the process in which the needle push rod 58 moves to the proximal end of the medical stapler. Can do.

  The needle push rod 58 and the cutter holder 326 according to the present invention cooperate with each other via the convex portion 582 and the hook 3261. Since the convex portion 582 and the needle push rod 58 are not located on the same plane, and the structure of the hook 3261 and the structure of the convex portion 582 are compatible with each other, the needle push rod 58 is made of the medical stapler. In the process of moving to the proximal end, the hook 3261 and the convex portion 582 are not separated from each other, so that the needle push rod 58 can smoothly pull out the cutter holder 326 in the process of moving to the proximal end of the medical stapler. Is secured.

  Although the specification has been described with reference to embodiments, it is to be understood that one embodiment does not include only one independent technical solution. This description method for the specification is easy to understand, and those skilled in the art regard the specification as a whole, and the technical solutions in each embodiment can be understood by those skilled in the art by appropriate combinations. It may be formed in other embodiments.

  The above detailed description is only a specific description of the possible embodiments of the present invention, and does not limit the protection scope of the present invention. All equivalent embodiments or modifications made without departing from the technical spirit of the present invention are included in the protection scope of the present invention.

Claims (10)

  A medical stapler comprising a needle push rod and a cutter holder disposed at a tip of the needle push rod, wherein the needle push rod has a convex portion protruding from the needle push rod, A hook that protrudes from the end surface is provided on the end surface close to the needle push rod, and the convex portion and the hook are fitted, whereby the needle push rod moves to the proximal end of the medical stapler. In addition, the convex portion acts to move the cutter holder to the proximal end of the medical stapler.   The needle push rod includes an end portion relatively provided with a first surface and a second surface, and the convex portion protrudes from at least one of the first surface and the second surface. The medical stapler according to claim 1.   The medical stapler according to claim 2, wherein the convex portion is formed by cutting and bending the end portion.   The medical stapler according to claim 1, wherein an accommodation space in which the convex portion is accommodated is formed between the hook and the end surface.   The medical stapler according to claim 4, wherein the hook includes a connection portion and a contact portion, and the connection portion is connected to the contact portion and the end surface to form the accommodating space. .   The convex portion includes a first side surface facing a proximal end of the medical stapler, the contact portion includes a contact surface facing a distal end of the medical stapler, and the needle push rod is the medical push rod. The medical stapler according to claim 5, wherein the first side surface and the contact surface are kept in contact and a relative stationary state in the process of moving to the proximal end of the stapler.   The medical stapler according to claim 6, wherein the convex portion includes a second side surface that faces the tip of the medical stapler and is kept in contact with the end surface.   The medical stapler according to claim 5, wherein the convex portion includes a third side surface facing the connection portion and maintaining contact with the connection portion.   The medical stapler according to claim 5, wherein a first angle that is an acute angle or a right angle is provided between the connection portion and the contact portion.   The medical stapler according to claim 5, wherein the contact portion is an elastic contact.

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