Disposable anastomat capable of preventing secondary percussion

Abstract

The disposable anastomat comprises a shell, a nail anvil, a nail bin and a knife pushing assembly, the nail anvil comprises a nail abutting seat, a nail abutting plate and a sliding piece, a knife feeding gap is formed between the nail abutting seat and the nail abutting plate, and the sliding piece is arranged in the knife feeding gap in a sliding mode. The near end of the nail abutting base is provided with a locking part which extends in the direction close to the nail abutting plate and has the elastic deformation capacity, and in the initial state, the sliding piece abuts against the locking part. The sliding part abuts against the locking part, so that the locking part deforms, the push-type broach assembly is not blocked, the push-type broach assembly can be normally triggered, after one-time triggering, due to the fact that the sliding part is pushed by the push-type broach assembly to be separated from the locking part and move to the far end, the locking part recovers and blocks the push-type broach assembly, and the push-type broach assembly can be normally triggered. Under the obstruction of the locking part, the push broach assembly cannot be triggered again, and the locking part and the sliding piece in the anastomat are simple in design, wider in applicability and capable of effectively preventing secondary triggering.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and particularly relates to a disposable stapler for preventing secondary firing. Background Art

[0002] A laparoscopic stapler is a commonly used instrument in laparoscopic surgery. The distal end of the laparoscopic stapler is a clamp that can be opened and closed. After the clamp is closed to clamp the tissue, pulling the firing handle can push the cutting knife and the firing block forward. While the cutting knife cuts the tissue, the firing block pushes the staples upward and staples the corresponding tissue.

[0003] During the operation, it may occur that the operator pushes the cutting knife again after it has been fired. At this time, the tissue will be cut off. Since there are no staples in the staple cartridge, the tissue cannot be sutured, which may cause serious problems such as bleeding and leakage of contents. Therefore, it is necessary to set up a safety mechanism to prevent secondary firing. Almost all the safety structures of existing staplers are designed for components with an outer diameter of 12 mm. When the outer diameter of the component is designed to be smaller, the existing safety structure cannot be installed in the internal space. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a disposable stapler for preventing secondary firing with a simpler structure and a smaller outer diameter.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A disposable stapler for preventing secondary firing, comprising a housing;

[0007] An anvil, the anvil is fixedly installed at the distal end of the housing. The anvil includes a staple base and a staple plate. The staple plate is provided with a cutting groove extending along the axial direction of the housing. There is a cutting gap between the staple base and the staple plate;

[0008] A staple cartridge with staples, the staple cartridge is rotatably installed at the distal end of the housing and has a closed state close to the anvil and an open state away from the anvil;

[0009] A push knife assembly, the push knife assembly is slidably arranged on the housing along the axial direction of the housing and can be fired to push the staples out of the staple cartridge to suture the target tissue. The push knife assembly includes a push knife rod and a cutting knife installed at the distal end of the push knife rod. The cutting knife is arranged in the cutting groove and one end is located in the cutting gap.

[0010] The proximal end of the staple base has a locking part extending towards the staple plate and having the ability of elastic deformation. The anvil further includes a sliding part slidably arranged in the cutting gap.

[0011] In the initial state, the sliding member abuts against the locking portion and deforms the locking portion to allow the push knife assembly to move towards the distal end; when the push knife assembly moves towards the distal end, the cutting knife pushes the sliding member to move towards the distal end together; when the sliding member disengages from the locking portion, the locking portion recovers and at least partially locates within the feed gap to form an obstruction to prevent the push knife assembly from being fired again.

[0012] In some embodiments, the inner end face of the locking portion has a guiding inclined surface that extends obliquely from the distal end towards the direction close to the staple plate. This guiding inclined surface facilitates the locking portion to be deformed by the abutment of the push knife assembly when the push knife assembly retracts, so as to allow the push knife assembly to retract to the initial position.

[0013] In some embodiments, the distal end face of the end portion of the cutting knife located within the feed gap has a guiding inclined surface that extends obliquely from the distal end towards the direction close to the staple plate.

[0014] In some embodiments, both the inner end face of the locking portion and the distal end face of the end portion of the cutting knife located within the feed gap have guiding inclined surfaces that extend obliquely from the distal end towards the direction close to the staple plate.

[0015] In some preferred embodiments, a groove is formed at the proximal end of the staple base, and the side wall of the groove forms the locking portion, and the locking portion extends obliquely from the distal end towards the direction close to the staple plate.

[0016] Further preferably, the locking portion is formed by stamping on the side wall of the groove.

[0017] Even more preferably, the groove is a U-shaped groove.

[0018] Preferably, the locking portion and the staple base are integrally formed.

[0019] Preferably, the sliding member slides axially along the housing.

[0020] In some embodiments, a guiding groove is formed on the outer end face of the staple plate and extends in the same direction as the feed groove, and a guiding block is provided at the end portion of the sliding member close to the staple plate, and the guiding block is slidably disposed within the guiding groove.

[0021] Further, there are two guiding grooves respectively disposed on the left and right sides of the feed groove, and there are two guiding blocks corresponding to the two guiding grooves one by one.

[0022] Preferably, the outer end face of the sliding member is arc-shaped and the bending radian is consistent with the inner wall of the staple base.

[0023] Preferably, the cutting knife includes a first cross beam and a second cross beam which are oppositely arranged, and a cutter body located between the first cross beam and the second cross beam. The first cross beam is located within the feed gap, and the second cross beam is located within the staple cartridge. When the push knife assembly is fired and moves towards the distal end, the second cross beam drives the staple cartridge to rotate so that the staple cartridge closes to clamp the target tissue.

[0024] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0025] In the disposable stapler of the utility model, by pressing the sliding member against the locking portion, the locking portion is deformed, so as not to form an obstruction to the push knife assembly, and the push knife assembly can be fired normally. After one firing, since the sliding member moves away from the locking portion to the distal end under the push of the push knife assembly, the locking portion can be restored and form an obstruction to the push knife assembly. Under the obstruction of the locking portion, the push knife assembly cannot be fired again. The design of the locking portion and the sliding member in this stapler is simple, has a wider applicability, and is conducive to the miniaturization design of the stapler. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of the staple cartridge assembly in Embodiment 1;

[0027] Figure 2 It is a schematic structural diagram of the staple cartridge assembly in Embodiment 1 from another angle;

[0028] Figure 3 For Figure 2 It is a cross-sectional view taken along the A-A plane, wherein the sliding member is in the initial position;

[0029] Figure 4 For Figure 3 It is an enlarged schematic diagram of part B in

[0030] Figure 5 For Figure 2 It is a cross-sectional view taken along the A-A plane, wherein the push knife assembly drives the sliding member to move towards the distal end when fired;

[0031] Figure 6 For Figure 5 It is an enlarged schematic diagram of part C in

[0032] Figure 7 For Figure 2 It is a cross-sectional view taken along the A-A plane, wherein the push knife assembly retreats to the position where the locking portion is located after one firing;

[0033] Figure 8 For Figure 7 It is an enlarged schematic diagram of part D in

[0034] Figure 9 For Figure 2Cross-sectional view taken along plane A-A, in which the pushing blade assembly is secondarily fired and moves towards the distal end;

[0035] Figure 10 is Figure 9 an enlarged schematic view of part E in;

[0036] Figure 11 is an exploded view of the anvil in Embodiment 1;

[0037] Figure 12 is a schematic structural view of the anvil holder in Embodiment 1;

[0038] Figure 13 is a schematic structural view of the anvil holder in Embodiment 1 from another angle;

[0039] Figure 14 is Figure 13 a cross-sectional view taken along plane B-B;

[0040] Figure 15 is a schematic structural view of the sliding member in Embodiment 1;

[0041] Wherein: 1. housing; 2. anvil; 21. anvil holder; 211. locking portion; 212. groove; 22. anvil plate; 221. feed groove; 222. guide groove; 23. feed clearance; 24. eagle beak portion; 3. staple cartridge; 31. staple cartridge seat; 32. staple cartridge body; 41. pushing blade rod; 42. cutting blade; 421. upper cross beam; 422. cutting blade body; 423. lower cross beam; 5. sliding member; 51. guide block; 52. outer end face of the sliding member. Detailed implementation manners

[0042] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary in nature and not restrictive.

[0043] In the description of the embodiments of the present invention, it should be understood that the distal end refers to the end of the instrument or component away from the operator, and the proximal end refers to the end of the instrument or component close to the operator; the axial direction refers to the direction parallel to the center line connecting the distal end and the proximal end of the instrument or component; the inner and outer are positions defined by the distance relative to the center of the instrument or component, where the inner is the position close to the center of the instrument or component, and the outer is the position away from the center of the instrument or component; the upper and lower refer to the orientation of the instrument in the actual use or working state. The description of the above orientation words is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present invention.

[0044] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0045] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0046] The above disclosure provides many different embodiments or examples for implementing different structures of the embodiments of the present utility model. To simplify the disclosure of the embodiments of the present utility model, components and settings of specific examples are described above. Of course, they are merely examples and are not intended to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0047] The present utility model will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0048] Embodiment 1

[0049] A disposable stapler includes an instrument platform (not shown in the drawings), a handle movably connected to the instrument platform (not shown in the drawings), and a staple cartridge assembly detachably connected to the distal end of the instrument platform. Among them, the instrument platform and the handle may adopt the structures commonly used in the prior art and will not be elaborated in this application.

[0050] As Figures 1 to 15 shown, the staple cartridge assembly includes a housing 1, an anvil 2 fixedly installed at the distal end of the housing 1, a staple cartridge 3 rotatably installed at the distal end of the housing 1, and a pusher assembly installed in the housing 1 and capable of moving axially along the housing 1. The staple cartridge 3 of the staple cartridge assembly can cooperate with the anvil 2 to clamp tissue, and it has a closed state close to the anvil 2 (see Figure 2 and Figure 3 ) and an open state away from the anvil 2 (seeFigure 1 )。

[0051] The opening and closing of the staple cartridge 3 can be achieved by the movement of the push knife assembly. Specifically, the anvil 2 includes a staple abutment 21 and a staple plate 22. The staple plate 22 is provided with a cutting groove 221 extending along the axial direction of the housing 1. There is a cutting gap 23 between the staple abutment 21 and the staple plate 22. The staple cartridge 3 includes a staple cartridge seat 31 and a staple cartridge body 32 mounted on the staple cartridge seat 31. The staple cartridge body 32 and the staple cartridge seat 31 are also respectively provided with a cutting groove 221 (not shown in the figure) along the axial direction of the housing 1. The push knife assembly includes a push knife rod 41 and a cutting knife 42. The cutting knife 42 is fixedly connected or formed at the distal end of the push knife rod 41. The cutting knife 42 includes an upper cross beam 421 (i.e., the first cross beam described above), a lower cross beam 423 (i.e., the second cross beam described above), and a cutter body 422 located between the upper cross beam 421 and the lower cross beam 423. The cutting blades for cutting tissue are fixedly provided or formed on the cutter body 422. Among them, the upper cross beam 421 is located in the cutting gap 23 between the staple abutment 21 and the staple plate 22 and cooperates with the surface of the staple plate 22 opposite to the staple abutting surface. The lower cross beam 423 cooperates with the outer side surface of the staple cartridge seat 31. In the initial state, the cutting knife 42 is located at the distal ends of the anvil 2 and the staple cartridge 3. When the push knife assembly receives a firing action from the handle, the push knife assembly moves towards the distal end. At this time, the lower cross beam 423 will drive the staple cartridge seat 31 to drive the staple cartridge 3 to rotate towards the direction close to the anvil 2, so that the staple cartridge 3 is closed to clamp the target tissue. Taking Figure 1 as an example, when the cutting knife 42 is fired and moves towards the distal end, the staple cartridge 3 rotates upward to the closed state.

[0052] In addition to controlling the rotation of the staple cartridge 3, the cutting knife 42 can also push a firing block (not shown in the drawings) provided in the staple cartridge body 32 to move towards the distal end, so as to sequentially push out the anastomosis staples in the staple cartridge body 32 from the staple cartridge 3, and then staple and combine them on the tissue under the cooperation of the staple plate 22. The specific structure of the staple cartridge body 32 can refer to the prior art and will not be elaborated in this application.

[0053] After the push knife assembly is fired once, it is possible that the operator may misoperate and fire again to push out the cutting knife 42. At this time, the tissue will be cut off. Since the anastomosis staples in the staple cartridge body 32 have been pushed out after one firing, there will be no anastomosis staples to suture the tissue after the second firing, which will cause serious problems such as bleeding and leakage of contents. In this application, by providing a locking portion 211 and a sliding member 5 on the anvil 2, through the cooperation of the sliding member 5, the locking portion 211 and the push knife assembly, etc., secondary firing can be prevented, and the specific description is as follows.

[0054] The proximal end of the anvil seat 21 has a locking portion 211 that extends toward the anvil plate 22 and has the ability to elastically deform. The cartridge assembly further includes a slider 5 slidably disposed in the feed gap 23. In the initial state, the slider 5 abuts against the locking portion 211 and deforms the locking portion 211 to allow the pusher assembly to move toward the distal end. When the pusher assembly is fired and moves toward the distal end, the cutting knife 42 pushes the slider 5 to move toward the distal end together. When the slider 5 moves away from the initial position (i.e., when it disengages from the locking portion 211), the locking portion 211 recovers and at least partially lies within the feed gap 23 to form a blockage, thereby preventing the pusher assembly from being fired a second time.

[0055] To facilitate the retraction of the pusher assembly, the locking portion 211 can be abutted and deformed by the pusher assembly to allow the pusher assembly to retract to the initial position. The inner end face of the locking portion 211 and / or the distal end face of the upper cross beam 421 has a guiding inclined surface that extends obliquely from far to near in the direction toward the anvil plate. In this embodiment, a U-shaped groove 212 is formed at the proximal end of the anvil seat 21, and the side wall of the groove 212 forms the locking portion 211 that extends obliquely from far to near in the direction toward the anvil plate 22 by stamping. The locking portion 211 is integrally formed with the anvil seat 21, and it can be directly formed on the anvil seat 211 without additional accessories, making the structure simpler and facilitating the miniaturized design of the stapler.

[0056] The slider 5 slides axially along the housing 1. The outer end face 52 of the slider is arc-shaped and the bending curvature is consistent with the inner wall of the anvil seat 21 so that it fits with the anvil seat 21. A guiding block 51 is provided at the lower end of the slider 5, and a guiding groove 222 extending in the same direction as the feed groove 221 is formed on the outer end face of the anvil plate 22. The guiding block 51 is slidably disposed in the guiding groove 222. Preferably, there are two guiding grooves 222 respectively disposed on the left and right sides of the feed groove 221, and the guiding block 51 has two corresponding to the two guiding grooves 222 one by one.

[0057] To facilitate lifting the tissue, the anvil 2 further includes an eagle beak portion 24 disposed at the distal end of the anvil seat 21.

[0058] Working principle:

[0059] In the initial state, as Figure 3 and Figure 4 shown, the slider 5 abuts against the locking portion 211, pushing the locking portion 211 upward, thus moving away from the feed gap 23.

[0060] When the push knife assembly is fired, since there is no obstruction of the locking portion 211 in the feed gap 23, the cutting knife 42 can smoothly pass through the locking portion 211 and push the sliding member 5 towards the distal end; when the sliding member 5 is taken away from the initial position by the cutting knife 42 (i.e., when it is disengaged from the locking portion 211), the locking portion 211 returns to the state of extending obliquely downward under the action of its own elastic force. At this time, the locking portion 211 obstructs in the feed gap 23, as Figure 5 and Figure 6 shown; when the push knife assembly moves to the farthest end, the push knife assembly retracts, and the sliding member 5 remains at the distal end of the feed gap 23; when the push knife assembly retracts to the position where the locking portion 211 is located, under the action of the retracting force of the push knife assembly, the upper cross beam 421 abuts against the inclined surface of the locking portion 211 and jacks up the locking portion 211 again, as Figure 7 and Figure 8 shown, so as to retract smoothly; when the push knife assembly is accidentally fired a second time, since the locking portion 211 is not abutted by the sliding member 5, it obstructs the push knife assembly from moving towards the distal end, as Figure 9 and Figure 10 shown, and the cutting knife 42 will not be pushed out, so that the tissue will not be cut.

[0061] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A disposable stapler for preventing secondary firing, comprising a housing (1); An anvil (2), the anvil (2) is fixedly installed at the distal end of the housing (1), the anvil (2) includes a staple base (21) and a staple plate (22), a cutting groove (221) extending along the axial direction of the housing (1) is formed in the staple plate (22), and a cutting gap (23) is provided between the staple base (21) and the staple plate (22); A cartridge (3) with staples, the cartridge (3) is rotatably installed at the distal end of the housing (1) and has a closed state close to the anvil (2) and an open state away from the anvil (2); A pusher assembly, the pusher assembly is slidably arranged on the housing (1) along the axial direction of the housing (1) and can be fired to push the staples out of the cartridge (3) to suture the target tissue. The pusher assembly includes a pusher rod (41) and a cutting knife (42) installed at the distal end of the pusher rod (41). The cutting knife (42) is arranged in the cutting groove (221) and one end is located in the cutting gap (23). It is characterized in that: A locking part (211) with the ability of elastic deformation extends towards the staple plate (22) at the proximal end of the staple base (21), and the anvil (2) further includes a sliding part (5) slidably arranged in the cutting gap (23); In the initial state, the sliding part (5) abuts against the locking part (211) and deforms the locking part (211) to allow the pusher assembly to move towards the distal end; when the pusher assembly moves towards the distal end, the cutting knife (42) pushes the sliding part (5) to move towards the distal end together; when the sliding part (5) disengages from the locking part (211), the locking part (211) recovers and at least partially locates in the cutting gap (23) to form a block to prevent the pusher assembly from being fired for the second time.

2. The disposable stapler for preventing secondary firing according to claim 1, wherein: The inner end surface of the locking part (211) has a guiding inclined surface extending obliquely from far to near towards the staple plate (22); and / or, The far end surface of the end of the cutting knife (42) located in the cutting gap (23) has a guiding inclined surface extending obliquely from far to near towards the staple plate (22).

3. The disposable stapler for preventing secondary firing according to claim 1, wherein: A groove (212) is formed at the proximal end of the staple base (21), the side wall of the groove (212) forms the locking part (211), and the locking part (211) extends obliquely from far to near towards the staple plate (22).

4. The disposable stapler for preventing secondary firing according to claim 3, characterized in that: The groove (212) is a U-shaped groove.

5. The disposable stapler for preventing secondary firing according to claim 1, wherein: The locking part (211) is integrally formed with the staple base (21).

6. The disposable stapler for preventing secondary firing according to claim 1, wherein: The sliding part (5) slides along the axial direction of the housing (1).

7. The disposable stapler for preventing secondary firing according to claim 6, wherein: A guiding groove (222) consistent with the extending direction of the cutting groove (221) is formed on the outer end surface of the staple plate (22), a guiding block (51) is arranged at the end of the sliding part (5) close to the staple plate (22), and the guiding block (51) is slidably arranged in the guiding groove (222).

8. The disposable stapler for preventing secondary firing according to claim 7, characterized in that: The guiding grooves (222) are two and are respectively arranged on the left and right sides of the feed groove (221), and the guiding blocks (51) are two and are in one-to-one correspondence with the two guiding grooves (222).

9. The disposable stapler for preventing secondary firing according to claim 1, characterized in that: The outer end surface (52) of the sliding member is arc-shaped and the bending radian is consistent with the inner wall of the anvil (21).

10. The disposable stapler for preventing secondary firing according to claim 1, wherein: The cutting knife (42) includes a first cross beam and a second cross beam which are oppositely arranged and a cutter body (422) located between the first cross beam and the second cross beam. The first cross beam is located in the feed gap (23), and the second cross beam is located in the cartridge (3). When the pushing knife assembly is fired and moves towards the distal end, the second cross beam drives the cartridge (3) to rotate so that the cartridge (3) is closed to clamp the target tissue.

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