WO2016107447A1

WO2016107447A1 - Medical anastomat

Info

Publication number: WO2016107447A1
Application number: PCT/CN2015/098178
Authority: WO
Inventors: 陈望东; 康建平
Original assignee: 苏州天臣国际医疗科技有限公司
Priority date: 2014-12-30
Filing date: 2015-12-22
Publication date: 2016-07-07
Also published as: JP3213926U; CN204562260U; DE212015000294U1

Abstract

A medical anastomat (100) comprises an ejector pin pole (58) and a knife rest (326). The knife rest (326) is disposed at a distal end of the ejector pin pole (58), and the ejector pin pole (58) is provided with a lug (582) protruding from and stretching out of the ejector pin pole (58). An end surface (3262) of the knife rest (326) close to the ejector pin pole (58) is provided with a snap (3261) protruding from and stretching out of the end surface (3262). The lug (582) fits the snap (3261). When the ejector pin pole (58) moves to a proximal end of the medical anastomat (100), the lug (582) drives the knife rest (326) to move to the proximal end of the medical anastomat (100). The ejector pin pole (58) and the knife rest (326) fit each other by means of the lug (582) and the snap (3261), and in the process in which the ejector pin pole (58) moves to the proximal end of the medical anastomat (100), the lug (582) is not separated from the snap (3261), so as to ensure that the ejector pin pole (58) smoothly draws out the knife rest (326) in the process of moving to the proximal end.

Description

Medical stapler

The present application claims the priority of the Chinese Patent Application Serial No. No. No. No. No. No. No. No. No. No. No. No.

Technical field

The invention belongs to the technical field of medical device manufacturing, and in particular relates to a medical stapler.

Background technique

The stapler is a medical device that is often used in the surgical operation of the intestines and other physiological tissues. It is a medically used alternative to traditional manual suture equipment. Due to the development of modern technology and the improvement of production technology, it is currently used clinically. The stapler is reliable in quality, easy to use, and suitable for tightness and tightness. In particular, it has the advantages of quick suturing, simple operation, few side effects and surgical complications, and sometimes causes tumor resection that cannot be removed in the past to be resected, which is well received at home and abroad. The favor and respect of clinical surgeons.

At present, after the stapling machine completes the cutting action, the cutter fixed on the knife holder needs to be pulled back by the pusher bar. As shown in FIG. 1 to FIG. 3, the cutter 302 is fixedly mounted on the tool holder 300, and the knife holder 300 is fixed. With a recess 301, the end portion 201 of the push rod 200 is provided with a hook member (not shown), which is inserted into the recess 301 through the hook member, so that the push rod 200 can control the proximal end of the holder 300 toward the stapler mobile. However, the structure of the tool holder and the push rod of this structure are complicated.

Summary of the invention

It is an object of the present invention to provide a medical stapler that can ensure that the pusher bar smoothly pulls out the tool holder during the proximal movement of the medical stapler.

In order to achieve the above object, the present invention provides a medical stapler including a pusher bar and a blade holder, the blade holder being disposed at a distal end of the pusher bar, the pusher bar having a convex protrusion a protrusion of the push rod, the end of the tool holder adjacent to the push rod is provided with a hook protruding from the end surface, and the protrusion and the hook cooperate to be pushed The bump acts to move the knife holder toward the proximal end of the medical stapler as the shank moves toward the proximal end of the medical stapler.

According to a further improvement of an embodiment of the present invention, the pusher bar includes an end portion including a first surface and a second surface disposed opposite to each other, the protrusion protruding from the first surface and the At least one of the second surfaces.

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

As a further improvement of an embodiment of the present invention, an accommodating space is formed between the hook and the end surface, and the bump is placed in the accommodating space.

As a further improvement of an embodiment of the present invention, the hook includes a connecting portion and a resisting portion, and the connecting portion connects the resisting portion and the end surface to form the receiving space.

As a further improvement of an embodiment of the present invention, the bump includes a first side facing the proximal end of the medical stapler, the abutting portion including a resisting surface facing the distal end of the medical stapler, During movement of the pusher bar toward the proximal end of the medical stapler, the first side and the abutment surface remain in contact and are relatively stationary.

As a further improvement of an embodiment of the invention, the bump includes a second side facing the distal end of the medical stapler, the second side and the end face remaining in contact.

As a further improvement of an embodiment of the present invention, the bump includes a third side facing the connecting portion, the third side being in contact with the connecting portion.

As a further improvement of an embodiment of the present invention, the connecting portion and the abutting portion have a first angle, and the first angle is an acute angle or a right angle.

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

Compared with the prior art, the present invention has the beneficial effects that the push rod and the tool holder of the present invention cooperate with each other through the bump and the hook, and the bump is pushed during the movement of the push rod to the proximal end of the medical stapler. And the hooks are not separated from each other, thereby ensuring that the push rod is smoothly pulled out of the tool holder during the proximal movement, and the structure is simple.

DRAWINGS

1 is a schematic structural view of a push rod in the prior art;

2 is a schematic structural view of a knife holder, a cutter and a pusher piece in the prior art;

3 is a schematic structural view showing a combination of a pusher bar and a tool holder and a push pin in the prior art;

4 is a schematic structural view of an embodiment of a medical stapler of the present invention;

5 is a schematic exploded view of a staple cartridge assembly and an anvil assembly in an embodiment of the medical stapler of the present invention;

6 is a schematic exploded view of an embodiment of a medical stapler of the present invention;

Figure 7 is a schematic exploded view showing a partial structure of an embodiment of the medical stapler of the present invention;

8 is a schematic structural view of a pusher bar according to an embodiment of the medical stapler of the present invention;

9 is a schematic structural view of a portion of a pusher bar according to an embodiment of the medical stapler of the present invention;

10 is a schematic structural view of a knife holder according to an embodiment of the medical stapler of the present invention;

Figure 11 is a cross-sectional view showing a partial structure of an embodiment of the medical stapler of the present invention;

12 is a schematic structural view showing a combination of a push rod and a knife holder according to an embodiment of the medical stapler of the present invention;

Figure 13 is a cross-sectional view showing a portion A-A of Figure 12;

detailed description

The invention will be described in detail below in conjunction with the specific embodiments shown in the drawings. But these implementations are not limited The structures, methods, or functional changes made by those skilled in the art based on these embodiments are all included in the scope of the present invention.

To clearly express the position and orientation described in this application, with the instrument operator as a reference, one end near the operator is the proximal end and the end remote from the operator is the distal end. Meanwhile, in the present application, the lower side of the stapler is defined as the direction in which the grip handle extends from the housing, as opposed to the lower side, which is defined as the upper side of the stapler.

As shown in FIG. 4, in an embodiment of the invention, the stapler 100 includes a housing 10, a support structure 20 projecting distally from the interior of the housing 10, and a staple anvil 30 attached to the distal end of the support structure 20. The nail anvil 30 is fixedly coupled to the support structure 20 and has an arcuate cross section. A grip handle 40 is formed under the proximal end of the housing 10, and an opening 31 is formed at one end of the nail anvil 30. The stapler 100 also includes a staple cartridge assembly 32 and an anvil assembly 34. In the present embodiment, the cartridge assembly 32 and the anvil assembly 34 are removably mounted to the staple anvil 30 and match the shape of the staple anvil 30, i.e., the cross-section of the cartridge assembly 32 and the anvil assembly 34. The sections are also arranged in an arc shape so that the physiological tissue can be aligned in a smaller operable space.

As shown in FIG. 5, the cartridge assembly 32 has a staple cartridge 322 that includes a staple cartridge surface (not labeled) with one or more rows of staple receiving slots arranged in a staggered manner on the staple cartridge surface (not labeled) The cartridge assembly 32 also includes a pusher tab 324 and a cutter member disposed within the staple cartridge 322. The pusher tab 324 can push the staples out of the staple receiving slot, the cutter member including a knife holder 326 and a cutter 328 mounted to the distal end of the knife holder 326. A staple cartridge cover 329 is disposed in the cartridge assembly 32 for blocking the staples and the cutter 328 in the staple cartridge 32 from studs and false shots.

A slit (not labeled) adapted to the cutter 328 is provided on the staple cartridge face and the pusher tab 324 to support the firing operation of the cutter 328. In the present embodiment, the staple receiving grooves are located on both sides of the slit, so that in the process of cutting and suturing the tissue, the two broken ends of the broken tissue can be simultaneously sutured.

5 to 7, in an embodiment of the present invention, the distal end of the cartridge assembly 32 is further connected with an anvil assembly 34, and the anvil assembly 34 includes an anvil 342 and an anvil 344. While the assembly 32 is mounted to the staple anvil 30, the anvil 342 and the anvil 344 are matingly mounted to the staple anvil 30.

The support structure 20 includes a pair of oppositely disposed left and

right brackets

22, 24. The left and

right brackets

22, 24 are respectively provided with pin holes on the nail anvil 30 and predetermined protrusions thereon. 302

mating mounting holes

222, 242 to secure the staple anvil 30 and the support structure 20 to each other.

The other end of the support structure 20 is coupled to the housing 10. Accordingly, the housing 10 includes a left half housing 12 and a right half housing 14 to respectively connect the left and

right side brackets

22, 24.

The stapler 100 also includes a firing assembly 50 that includes a firing handle 52 disposed below the stapler 100, a staple cartridge pusher 54 that is driven by the firing handle 52, and a transmission member that connects the firing handle 52 and the staple cartridge pusher 54. Nail warehouse push The rod 54 can be driven by the firing handle 52 to drive the cartridge assembly 32 distally from the proximal end of the stapler 100 to approach the anvil assembly 34, ultimately closing the cartridge assembly 32 and the anvil assembly 34. At this point, if a physiological tissue is placed between the cartridge assembly 32 and the anvil assembly 34, the staple cartridge pusher 54 can drive the cartridge assembly 32 adjacent the anvil assembly 34 to clamp the physiological tissue.

In an embodiment of the invention, the transmission member includes a front link 562 and a rear link 564. The distal end of the front link 562 is coupled to the staple cartridge pusher 54, the proximal end of the front link 562 is coupled to the distal end of the rear link 564, and the proximal end of the rear link 564 is coupled to the support structure 20.

In order to guide the staple cartridge pusher 54 to move in a predetermined closing direction, the support structure 20 is provided with second sliding

grooves

228, 246 extending distally from the proximal end of the stapler 100, and correspondingly, the second sliding

groove

228, 246 is formed on the left side bracket 22 and the right side bracket 24. The staple cartridge pusher 54 is mounted between the left side bracket 22 and the right side bracket 24, to which is attached a second sliding pin 561 adapted to the second sliding

groove

228, 246 through which the staple cartridge push rod 54 passes The pin 561 is slidably engaged with the second sliding

grooves

228, 246. In a preferred embodiment, the second sliding pin 561 is a pivoting shaft that connects the staple cartridge push rod 54 and the front connecting rod 562. Thus, the second sliding pin 561 substantially utilizes the original structure in the stapler 100 for improvement. The design avoids the complexity of increasing the structure of the stapler 100. Of course, in an alternative embodiment, the second slide pin 561 may not be designed to connect the pivot axis of the staple cartridge pusher 54 and the front link 562, but The attachment is provided at other suitable locations on the staple cartridge pusher 54.

A first sliding slot 542 is further disposed on the staple cartridge push rod 54. The supporting structure 20 is connected with a first sliding pin 544 adapted to the first sliding slot 542. The first sliding slot 542 and the second sliding

slot

228, 246 are mutually connected to each other. Parallelly disposed, specifically, the left side bracket 22 and the right side bracket 24 are respectively provided with mounting

holes

226, 244 for fixing the first sliding pin 544, and the first sliding pin 544 passes through the first sliding groove 542 and is slidably engaged therewith. As such, the stapler 100 of the present embodiment includes two portions for defining a sliding path of the staple cartridge pusher 54, which are respectively a first sliding groove 542 and a first sliding pin 544 that are engaged with each other, and a second sliding groove. 228, 246 and the second sliding pin 561, and the second sliding pin 561 is closer to the proximal end of the stapler 100 with respect to the first sliding groove 542.

During the closing of the stapler 100, the front link 562 exerts an oblique upward thrust on the staple cartridge pusher 54 when it pivots itself, and the second slide pin 561 on the staple cartridge pusher 54 is biased to actuate the oblique The upward partial force component of the upward thrust acts on the upper portions of the second sliding

grooves

228, 246 on the left side bracket 22 and the right side bracket 24, and applies the upper portion of the second sliding

grooves

228, 246 to the second sliding pin 561. The reaction force is offset. Since the second sliding

grooves

228, 246 extend in the moving direction of the cartridge assembly 32, and the first sliding groove 542 and the second sliding

grooves

228, 246 are parallel to each other, the current link 562 pushes the second sliding pin 561 to slide along the second direction. When the

slots

228, 246 are moved in the extending direction, the staple cartridge pusher 54 connected to the first sliding pin 544 is restricted from moving in a direction defined by the first sliding slot 542, and the first sliding pin 544 and the staple cartridge push rod 54 are moved. At this time, the friction between the first sliding grooves 542 is not generated by the interference, so that the closing force when the instrument is closed is greatly reduced. At the same time, the front link 562 is moved in the second sliding

grooves

228, 246 of the left and

right brackets

22, 24 by driving the second sliding pin 561, thereby ensuring structural stability and rigidity, and ensuring that the instrument can be smoothly closed in a thick tissue state. The closing feel of the stapler 100 is made better, and the structural stability of the stapler 100 is further increased.

In the above embodiment, the first sliding groove 542 and the second sliding

grooves

228, 246 are both waist grooves to optimize the mutual relationship with the first sliding pin 544 and the second sliding pin 561.

The stapler 100 further includes an anti-overflow needle assembly including an anti-overflow needle pusher 62, a drive pusher 64 coupled to the spill prevention needle pusher 62, and an anti-overflow through the staple cartridge assembly 32. The needle 61 (shown in Fig. 5), the spill prevention needle 61 and the transmission push rod 64 are connected in linkage.

In an embodiment of the present invention, the spill prevention needle pusher 62 is provided in a saddle shape, and is provided with a symmetrical operation portion at the proximal end, and the operation portion protrudes from the housing 10.

The spill prevention needle assembly also includes a rotary crank 66 that is coupled to the spill prevention needle pusher 62. The turning crank 66 is pivotally coupled to the bracket 20 while being movably coupled to the staple cartridge pusher 54. The anti-overflow needle pusher 62 can be advanced from the proximal end of the stapler 100 to the distal end by the operation portion of the spill prevention needle pusher 62. At the same time, when the anti-overflow needle pusher 62 is pushed, the transmission pusher 64 is also interlocked. The distal end is moved to associate the anti-overflow needle 61 to the distal end of the stapler in association.

The operation procedure of the stapler 100 in the embodiment of the present invention when clamping the physiological tissue is as follows:

In the initial state of the stapler 100, the front link 562 and the rear link 564 are disposed at an angle of less than 180 degrees, and the connection portion of the front link 562 and the rear link 564 abuts against the firing handle 52. Support portion 522.

When it is desired to clamp the physiological tissue, the physiological tissue can be placed between the anvil surface of the anvil assembly 34 and the staple cartridge surface of the cartridge assembly 32, and then the anti-overflow plunger 62 is pushed toward the distal end of the stapler. The linkage pusher 64 and the spill prevention needle 61 are moved toward the distal end of the stapler to extend the spill prevention needle 61 from the cartridge assembly 32 and ultimately to the receiving portion provided on the anvil assembly 34 (not labeled The fit closes the opening between the anvil assembly 34 and the cartridge assembly 32, that is, the opening of the staple anvil 30.

Then, the driving firing handle 52 is pivotally pivoted toward the grip handle 40, and the front link 562 and the rear link 564 are forcedly opposed by the support portion 522 abutting the joint portion of the front link 562 and the rear link 564. Pivoting and moving toward a state that tends to increase the angle between the two.

In an embodiment of the present invention, the front link 562 and the rear link 564 can be driven by the support portion 522 to a relatively stable mating state in which the clip is slightly larger than 180 degrees, and finally resist the abutting portion on the support structure 20. 224, at this time, the front link 562 and the rear link 564 are moved to an interference state.

During this process, the distance defined between the distal end of the front link 562 and the proximal end of the rear link 564 is gradually increased to the maximum distance. A slight decrease from the rear, since the proximal end of the rear link 564 is fixed to the support structure 20, the distal end of the front link 562 enables the movement of the staple cartridge push rod 54 toward the distal end of the stapler, the staple cartridge push rod The driving force acting on the cartridge assembly 32 causes the cartridge assembly 32 to be forced toward the anvil assembly 34, thereby clamping the physiological tissue.

In an embodiment of the invention, the firing assembly 50 further includes a pusher bar 58 that is slidably fitted within the staple cartridge pusher 54. The surfaces of the pusher bar 58 that interact with the tool post 326 are adapted to each other. shape.

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

A wedge piece 524 is attached to the firing handle 52, and the wedge piece 524 can be at least partially fitted into the staple cartridge pusher 54 to effect interaction with the pusher bar 58.

The operation procedure of the stapler 100 in an embodiment of the present invention when cutting and suturing a physiological tissue is as follows:

After the above-described clipping physiological tissue operation is completed, the firing handle 52 is rotated in a direction away from the holding handle 40 by the handle return spring (not shown) to realize automatic resetting of the firing handle 52.

During this process, the wedge piece 524 on the firing handle 52 is triggered to abut against the pusher bar 58 and, at this time, the wedge piece 524 is pushed by pivoting the firing handle 52 in the direction of the grip handle 40. The shank 58 is moved toward the distal end of the stapler to achieve simultaneous firing of the cutter 328 and the pusher piece 324, and the pusher piece 324 pushes the staple in the staple receiving groove to be tightly attached to the physiological tissue while cutting the knife 328 cuts the corresponding physiological tissue.

The proximal end of the pusher bar 58 has a latching portion 582 extending outside the staple cartridge pusher 54. The firing assembly further includes a returning resilient member 59 coupled between the latching portion 582 and the support structure 20, in the present invention. In one embodiment, the return spring element 59 is a tension spring.

During the process in which the pusher bar 58 is fired, the returning elastic member 59 is in a stretched state, and the stapler is in the fired state, that is, after the physiological tissue is cut and sewn, the elastic member 59 is restored in its own pulling force. Next, the pusher bar 58 is pulled back, and at the same time, the blade holder 326 provided with the cutter 328 can be pulled back. Thus, the stapler completes the entire firing process and reaches the completion state of the firing.

After the stapler has reached the firing completion state, the closed staple cartridge assembly 32 and the anvil assembly 34 can be opened by pressing the release button 70.

In an embodiment of the invention, the release button 70 is movably coupled to the support structure 20 by a release button pin 702, and the proximal end of the rear link 564 can also be coupled to the support structure 20 by connection with the release button pin 702. Relatively fixed.

The distal end of the release button 70 has a resisting end 704 that can interact with the rear link 564. When the release button 70 is pressed, the abutting end 704 drives the front link 562 and the rear link 564 toward an angle of less than 180 degrees. The state movement, that is, the connection portion of the front link 562 and the rear link 564 moves toward the lower side of the stapler to break the relatively stable cooperation state between the front link 562 and the rear link 564, thereby pushing the staple cartridge The rod 54 and the cartridge assembly 32 are pulled back to the opposite proximal end to position the instrument from the surgical section Bit removed.

Of course, if the stapler needs to be used again, the new cartridge assembly 32 and/or anvil assembly 34 can be replaced for the next cutting stitch. During the replacement and use of the cartridge assembly 32, the principle to be followed is that the knife holder 326 and the pusher tab 324 within the unused cartridge assembly 32 must remain in the retracted position inside the staple cartridge 322; When the staples and cutters 328 within the cartridge assembly 32 are fired, the pusher tabs 324 must remain in their fired position so that the front end of the pusher tabs 324 remains visible, thereby providing the user with the staple cartridge assembly 32 The visual implication is used; and when the entire firing process is completed, the tool holder 326 must be retracted and retained inside the staple cartridge 322 to ensure that the cutting edge of the cutter 328 to which it is attached is not exposed to the outside of the staple cartridge 322. At the same time, a

visual window

3222, 3224 is opened on one side wall of the staple cartridge 322, and is used for correspondingly observing the position of the pusher piece 324 and the knife holder 326, thereby judging the use state of the staple cartridge assembly, and improving the use feeling of the stapler. .

Referring to FIG. 8 to FIG. 13 , in an embodiment of the present invention, the push rod 58 has a protrusion 582 protruding from the push rod 58 , and the holder 326 is adjacent to the push rod 58 . The end surface 3262 is provided with a hook 3261 protruding from the end surface 3262, and the protrusion 582 and the hook 3261 cooperate to move when the push rod 58 moves toward the proximal end of the medical stapler. The bump 582 acts on the hook 3261 to move the tool holder 326 toward the proximal end of the medical stapler.

In the present embodiment, the distal end of the push rod 58 is provided with an end portion 581 which is formed by cutting and bending the end portion 581, that is, the protrusion 582 and the push rod 58 integrated molding. The end portion 581 has a first surface 5811 and a second surface 5812 disposed opposite to each other. The protrusion 582 protrudes from at least one of the first surface 5811 and the second surface 5812. Thus, the process is simple and the bump is The strength of the connection between the 582 and the push rod 58 is preferred.

In this embodiment, the distal end portion 581 of the push rod 58 is an arcuate end, the first surface 5811 and the second surface 5812 are curved surfaces, and the first surface 5811 is an inner surface. The second surface 5812 is an outer surface. In the embodiment, the protrusion 582 protrudes from the first surface 5811, that is, the protrusion 582 is bent inward by a portion of the end portion 581. The bumps 582 are preferably rectangular bumps. In other embodiments, the protrusion 582 can protrude from the second surface 5812, that is, the protrusion 582 is bent outward from a portion of the end portion 581. Correspondingly, the hook 3261 The direction of the opening also changes accordingly. The protrusions 582 can protrude from the first surface 5811 and the second surface 5812 at the same time. For example, a plurality of mutually separated protrusions 582 are formed at the end 581 of the push rod 58 , and a part of the plurality of protrusions 582 protrudes. Out of the first surface 5811, another portion of the plurality of bumps 582 protrudes from the second surface 5812. At the same time, a plurality of hooks 3261 are formed at the end surface 3262 of the tool holder 326, and the plurality of hooks 3261 can be staggered. The plurality of bumps 582 are arranged in the opening direction, so that the plurality of bumps 582 can be embedded in the plurality of hooks 3261. The size and position of the plurality of bumps 582 can be determined according to specific conditions.

As shown in FIG. 10 and FIG. 11 , an accommodating space 3267 is formed between the hook 3261 and the end surface 3262 of the tool holder 326, and the accommodating space 3267 is for accommodating the protrusion 582. The accommodating space 3267 is surrounded by the connecting portion 3263, the resisting portion 3265 and the end surface 3262. The connecting portion 3263 is located between the resisting portion 3265 and the end surface 3262. The resisting portion 3265 is not in contact with the end surface 3262. . In other embodiments, the hook 3261 and the tool holder 326 can be integrally formed.

In the embodiment, the connecting portion 3263 and the abutting portion 3265 have a first angle, and the first angle is an acute angle or a right angle, so that the bump 582 and the hook 3261 The cooperation between the two is more stable.

In the present embodiment, as shown in FIG. 8 to FIG. 13 , the protrusion 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 The second side 5822 is oppositely disposed, and the third side 5823 is disposed opposite to the fourth side 5824. As shown in FIG. 13 , the first side surface 5821 of the protrusion 582 faces the proximal end of the medical stapler, and the abutting portion 3265 includes a resisting surface 3266 toward the end surface 3262 at the push rod 58 . During the proximal movement of the medical stapler, the first side surface 5821 is in contact with the abutting surface 3266 and is relatively stationary. Thus, the protrusion 582 is stably engaged with the hook 3261 to ensure the push rod 58. The knife holder 326 also moves proximally during the proximal movement of the medical stapler. The abutting portion 3265 may be a square, a rectangle, or the like, but is not limited thereto.

In the present embodiment, as shown in FIG. 13 , the second side surface 5822 of the bump 582 faces the distal end of the medical stapler, and the second side surface 5822 is integrally in contact with the end surface 3262 . Thus, since the first side surface 5821 and the second side surface 5822 opposite to each other on the bump 582 are in contact with the abutting surface 3266 and the end surface 3262, respectively, the push rod 58 and the knife holder 326 are further ensured toward the proximal end of the medical stapler. When moving in the distal direction, the bump 582 does not disengage from the hook 3261, and the push rod 58 and the tool holder 326 are relatively stationary.

In this embodiment, as shown in FIG. 9 , the fourth side 5824 of the protrusion 582 faces the first surface 5811 of the push rod 58 , and between the fourth side 5824 and the first surface 5811 . Forming a second angle α, which is a bending angle of the end portion 581 of the push rod 58. The second angle α is greater than 0° and less than 180°, and the second angle α is smaller than Jia is an acute angle. It should be noted that since the first surface 5811 and the fourth side surface 5824 are all curved surfaces, the second angle α is substantially an angle between the cut surfaces of the first surface 5811 and the fourth side surface 5824.

In this embodiment, the connecting portion 3263 of the hook 3261 includes a connecting surface 3264 facing the accommodating space 3267, and the connecting portion 3263 can be adapted to the second angle α formed by the bump 582, that is, when When the bump 582 is received in the hook 3261, the angle between the connecting surface 3264 and the cut surface of the first surface 5811 is equal to the second angle α. When the bump 582 is received in the hook 3261, the third side 5823 contacts the connecting surface 3264. Since the third side 5823 is disposed opposite to the fourth side 5824, the cut surface of the third side 5823 and the cut surface of the first surface 5811 Between the clips The corner essence is also the second angle α. Thus, the third side surface 5823 can be almost completely in contact with the connecting surface 3264, so that the cooperation of the bump 582 and the hook 3261 is more stable. Wherein, when the connecting surface 3264 is disposed to conform to the curved surface of the third side surface 5823, the third side surface 5823 can be in full contact with the connecting surface 3264.

The operation process of the pusher bar 58 and the tool post 326 in this embodiment is as follows:

When the pusher bar 58 drives the blade holder 326 to move toward the distal end of the medical stapler, since the protrusion 582 is received in the accommodating space 3267, the pusher bar 58 is directed toward the knife holder 326 toward the medical stapler. The driving force of the end, that is, the push rod 58 pushes the pusher piece 324 and the cutter 328 on the knife holder 326 toward the tissue, thereby achieving cutting and stitching of the tissue; when the cutting and suturing process of the tissue is completed, pushing the nail The rod 58 needs to drive the knife holder 326 and the cutter 328 toward the proximal end of the medical stapler. When the push rod 58 drives the knife holder 326 to move toward the proximal end of the medical stapler, since the protrusion 582 in the embodiment is partially bent, and the hook 3261 and the protrusion 582 are adapted to each other, the push rod is adjusted. The projection 582 does not disengage from the hook 3261 during movement toward the proximal end of the medical stapler, and the pusher bar 58 smoothly pulls out the blade holder 326.

The push rod 58 and the tool holder 326 of the present invention are mutually matched by the protrusion 582 and the hook 3261. The protrusion 582 and the push rod 58 are not in the same plane, and the structure of the hook 3261 is adapted to the structure of the protrusion 582. The hook 3261 and the protrusion 582 are not separated from each other during the proximal movement of the pusher bar 58 to ensure that the pusher bar 58 smoothly pulls out the blade holder 326 during the proximal movement of the medical stapler.

It should be understood that, although the description is described in terms of embodiments, the embodiments are not intended to be construed as a single. The technical solutions in the embodiments may also be combined as appropriate to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions set forth above are merely illustrative of the possible embodiments of the present invention, and are not intended to limit the scope of the present invention. Changes are intended to be included within the scope of the invention.

Claims

A medical stapler includes a pusher bar and a blade holder, and the blade holder is disposed at a distal end of the pusher bar, wherein the pusher bar has a convex protrusion protruding from the pusher bar Block, the end of the tool holder adjacent to the push rod is provided with a hook protruding from the end surface, and the protrusion and the hook cooperate to make the push rod to the medical anastomosis The bump acts to move the knife holder toward the proximal end of the medical stapler as the proximal end of the device moves.
The medical stapler according to claim 1, wherein the pusher bar comprises an end portion, the end portion includes a first surface and a second surface disposed opposite to each other, and the protrusion protrudes from the first At least one of a surface and the second surface.
The medical stapler according to claim 2, wherein the projection is formed by cutting the end portion and bending.
The medical stapler according to claim 1, wherein an accommodating space is formed between the hook and the end surface, and the protrusion is placed in the accommodating space.
The medical stapler according to claim 4, wherein the hook comprises a connecting portion and a resisting portion, and the connecting portion connects the abutting portion and the end surface to form the receiving space.
The medical stapler of claim 5 wherein said projection includes a first side facing the proximal end of said medical stapler, said abutment portion including abutment toward a distal end of said medical stapler The first side is in contact with the abutting surface and is relatively stationary during movement of the push rod to the proximal end of the medical stapler.
The medical stapler of claim 6 wherein said projection includes a second side facing the distal end of said medical stapler, said second side and said end face remaining in contact.
A medical stapler according to claim 5, wherein said projection includes a third side facing said connecting portion, said third side being in contact with said connecting portion.
The medical stapler according to claim 5, wherein the connecting portion and the abutting portion have a first angle, and the first angle is an acute angle or a right angle.
The medical stapler according to claim 5, wherein the abutting portion is an elastic abutting portion.