Firing structure, staple cartridge assembly, and surgical stapler

Abstract

Provided in the present application are a firing structure, a staple cartridge assembly, and a surgical stapler. The firing structure is configured for use in a staple cartridge assembly of a surgical stapler and can be driven to move in an axial direction of the surgical stapler. The firing structure comprises a base portion and a staple pushing portion disposed on the base portion. The staple pushing portion comprises a driving portion and an elastic portion. The driving portion is at least partially located on a distal end side of the elastic portion. When the elastic portion is in an initial state, the height of the highest point of the elastic portion is not greater than the height of the highest point of the body of the staple cartridge, and the elastic portion is configured to elastically deform and become shorter in height when being driven to move in a distal direction. By adopting the firing structure of the present application, the staples can be assisted to be properly formed and separated from staple holes when the stapler is fired.

Description

Firing structure, staple cartridge assembly, and surgical stapler TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a firing structure, a staple cartridge assembly and a surgical stapler. BACKGROUND

[0002] In the prior art, a medical stapler generally comprises a device platform, a firing handle movably connected to the device platform, and a staple head mounted on the device platform. The staple head can pass through a small incision on the body through a puncture device to access the surgical site to perform surgery. The staple head comprises a staple cartridge assembly and an anvil oppositely arranged. The staple cartridge assembly comprises a staple belt, a support for supporting the staple belt, and a staple cartridge cover for accommodating the staple belt and the support, and a firing member is arranged on the proximal end side of the staple cartridge cover. When the stapler is fired, the knife rod pushes the cutting knife to move towards the distal end side, the cutting knife drives the firing member to move towards the distal end side of the stapler, the firing member pushes the anastomosis staples rotatably connected to the staple belt body outward, the cutting knife cuts the tissue between the staple cartridge assembly and the anvil, and the firing of the stapler is realized.

[0003] In the existing stapler, when the firing member pushes the anastomosis staples outward, the anastomosis staples are closed and formed under the action of the anvil. However, in actual use, the anastomosis staples may not be completely closed, resulting in poor suturing effect on the tissue and seriously affecting the surgical effect. SUMMARY

[0004] In view of the problems in the prior art, the purpose of the present application is to provide a firing structure, a staple cartridge assembly and a surgical stapler, which can assist the anastomosis staples to better close and form when the stapler is fired.

[0005] The present application provides a firing structure for a staple cartridge assembly of a surgical stapler and can be driven to move in the axial direction of the surgical stapler. The staple cartridge assembly comprises a staple cartridge body, and the firing structure comprises a base and a staple pushing portion arranged on the base. The staple pushing portion comprises a driving portion and an elastic portion. The driving portion is at least partially located on the distal end side of the elastic portion. When the elastic portion is in an initial state, the highest point of the elastic portion is not higher than the highest point of the staple cartridge body, and the elastic portion is configured to be driven to move in the distal direction and to be elastically deformed to lower the height.

[0006] In some embodiments, the staple cartridge assembly further comprises at least one anastomosis staple, the anastomosis staple is rotatably connected to the staple cartridge body through a staple connecting portion, the anastomosis staples are aligned in the axial direction, and the anastomosis staples are aligned in the axial direction with the staple pushing portion;

[0007] The firing structure is driven to move in the distal direction to make the elastic part abut against the at least one anastomosis nail, and after the elastic part is elastically deformed by the abutting force of the anastomosis nail, the highest point of the elastic part is lower than or equal to the lowest point of the nail connecting part; after the firing structure continues to move in the distal direction and is separated from the anastomosis nail, the elastic part returns to the initial state.

[0008] In some embodiments, when the elastic part is in the initial state, the highest point of the elastic part is higher than the highest point of the driving part.

[0009] In some embodiments, the firing structure is provided with a space for accommodation on the proximal side of the elastic part, so that the elastic part can enter the space for accommodation after deformation. In some embodiments, the base part is further provided with a nail cutting part, which is located on the proximal side of the nail pushing part, and after the elastic part is elastically deformed, the highest point of the elastic part is lower than or equal to the highest point of the nail cutting part.

[0010] In some embodiments, the elastic part is an elastic member, which is installed on the base part.

[0011] In some embodiments, the base part is provided with a mounting groove, and the driving part is at least partially located on the distal side of the mounting groove. The elastic member includes a protruding part and a mounting part, the mounting part is embedded in the mounting groove, and the protruding part is at least partially protruding above the mounting groove.

[0012] In some embodiments, the base part is provided with a first abutting part and a second abutting part on the proximal side of the driving part. The elastic member includes a first mounting part, a protruding part and a second mounting part arranged in sequence. The first mounting part and the second mounting part are arranged on the base part and abut against the first abutting part and the second abutting part respectively. The position opposite to the protruding part of the base part is provided with an accommodation groove.

[0013] In some embodiments, the elastic part is integrally formed with the driving part and / or the base part.

[0014] In some embodiments, the elastic part includes a fixed end, a protruding part and a free end arranged in sequence. The fixed end of the elastic part is fixed to the driving part, and the free end of the elastic part extends in the proximal direction relative to the fixed end.

[0015] In some embodiments, the nail pushing part includes a first nail pushing part and a second nail pushing part. The second nail pushing part is located on the distal side of the base part. The first nail pushing part is connected to the base part through a first assembly part, and the second nail pushing part is located on the outer side of the first nail pushing part.

[0016] In some embodiments, the pushing part is provided with a first assembly part, the base part is provided with a second assembly part, the first assembly part is connected with the second assembly part, so that the pushing part is fixed to the base part.

[0017] In some embodiments, the base part is provided with a third assembly part and a first limiting structure, the cutting part is provided with a fourth assembly part and a second limiting structure, the fourth assembly part is connected with the third assembly part, so that the cutting part is fixed to the base part, the cutting part is at least partially located at the proximal end side of the pushing part, and the first limiting structure and the second limiting structure are embedded, so as to block the transverse movement of the cutting part relative to the base part.

[0018] The second aspect of the present application further provides a staple cartridge assembly comprising the firing structure.

[0019] The third aspect of the present application further provides a surgical stapler comprising the staple cartridge assembly.

[0020] The firing structure, the staple cartridge assembly and the surgical stapler provided by the present application have the following advantages:

[0021] The present application provides a firing structure of a staple cartridge assembly of a surgical stapler. When the stapler is fired, the firing structure moves from the proximal end to the distal end of the staple cartridge assembly. The driving part first abuts against the staple and drives the staple to rotate and gradually close under the action of the anvil, and then the elastic part abuts against the staple. The elastic part can assist the staple to better close and form, and under the abutting force of the staple, the elastic part will elastically deform to avoid other components in the staple cartridge assembly, so that the movement to the distal end can continue more smoothly without affecting the normal firing of the stapler. Moreover, since the highest point of the elastic part is not higher than the highest point of the staple cartridge body, the elastic part will not interfere with other components in the staple cartridge assembly during axial movement. Therefore, the firing structure can further ensure that the staple can be completely closed and formed and smoothly separated from the staple hole during the firing of the stapler without affecting the smoothness of the firing of the stapler. BRIEF DESCRIPTION OF DRAWINGS

[0022] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments with reference to the attached drawings.

[0023] FIG. 1 is a structural schematic view of a staple cartridge assembly according to an embodiment of the present application;

[0024] FIG. 2 is a structural schematic view of the staple cartridge assembly of FIG. 1 after removing a staple cartridge cover;

[0025] FIG. 3 is a schematic view of the cooperation between the firing structure and the staple belt according to the embodiment of the present application;

[0026] FIG. 4(a) is a front view of a firing structure and staple band cooperation of the present application embodiment 1;

[0027] FIG. 4(b) is a left view of a firing structure and staple band cooperation of the present application embodiment 1;

[0028] FIG. 5 is a schematic view of a firing structure of the present application embodiment 2;

[0029] FIG. 6 is a front view of a firing structure of the present application embodiment 2;

[0030] FIG. 7 is a front view of a firing structure of the present application embodiment 3;

[0031] FIG. 8 is a schematic view of a firing structure of the present application embodiment 4;

[0032] FIG. 9 is a front view of a firing structure of the present application embodiment 4;

[0033] FIG. 10 is a schematic view of a firing structure of the present application embodiment 5;

[0034] FIG. 11 is a schematic view of a firing structure of the present application embodiment 6;

[0035] FIG. 12 is a schematic view of a firing structure and staple band cooperation of the present application embodiment 6;

[0036] FIG. 13 is a schematic view of a firing structure of the present application embodiment 7;

[0037] FIG. 14 is an exploded view of a firing structure of the present application embodiment 7;

[0038] FIG. 15 is a schematic view of a firing structure of the present application embodiment 8;

[0039] FIG. 16 is an exploded view of a firing structure of the present application embodiment 8;

[0040] FIG. 17 is a schematic view of a firing structure of the present application embodiment 9;

[0041] FIGS. 18 and 19 are exploded views of a firing structure of the present application embodiment 9;

[0042] FIGS. 20 and 21 are exploded views of a firing structure of the present application embodiment 10.

[0043] Reference: 1 Firing structure (Embodiment 1-4) 331 Second assembly part 11 Pushing nail part 4 Firing structure (Embodiment 8) 111 Driving part 41 Pushing nail part 112 Elastic part 411 Driving part 1121 Mounting part 412 Elastic part 11211 First mounting part 413 First assembly part 11212 Second mounting part 42 Cutting nail part 1122 Protruding part 43 Base part 1123 Free end 431 Second assembly part 12 Cutting nail part 5 Firing structure (Embodiment 9, 10) 13 Base part 51a First pushing nail part 131 Mounting groove 511a First driving part 132 Letting go groove 512a First elastic part 133 First abutting part 513a First assembly part 134 Second abutting part 514a Third assembly part 2 Firing structure (Embodiment 5, 6) 51b Second pushing nail part 21 Pushing nail part 511b Second driving part 211 Driving part 512b Second elastic part 212 Elastic part 2121 Fixed end 521 Sixth assembly part 2122 Protruding part 522 Second limiting structure 2123 Free end 523 Supporting part 2124 Limiting part 53 Base part 22 Cutting nail part 533 Second assembly part 23 Base part 534 Fourth assembly part 231 Letting go space 535 Fifth assembly part 3 Firing structure (Embodiment 7) 536 First limiting structure 31aFirst pushing nail part 100 Nail cartridge cover 311a First driving part 101 Positioning part 312a First elastic part 200 Nail belt 313a First assembly part 201 Nail belt body 31b Second pushing nail part 203 Staple 311b Second driving part 2031 Nail connecting part 312b Second elastic part 2032 Staple leg 32 Cutting nail part 300 Support 33 Base DETAILED DESCRIPTION

[0044] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive aspects of example implementations to those skilled in the art. The term "or" as used herein may be considered inclusive, exclusive, or both, depending on the context in which it is used. Although the terms "first," "second," "third," etc. can be used herein to describe various example features, these terms are used herein only to distinguish one example implementation from another, and do not imply a particular order or importance of the features. The term "coupled" as used herein means the direct or indirect joining of two members together such that some form of electrical, mechanical, or optical relationship exists between the members. The term "connected" as used herein means the joining of two members together such that some form of electrical, mechanical, or optical relationship exists between the members.

[0045] Embodiments of the present application provide a firing structure, a staple cartridge assembly including the firing structure, and a surgical stapler including the staple cartridge assembly. The staple cartridge assembly includes a staple cartridge body. The firing structure is drivable in an axial direction of the surgical stapler. The firing structure includes a base and a pushing nail part provided on the base, the pushing nail part including a driving part and an elastic part, the driving part being at least partially located on a distal side of the elastic part, the elastic part having a maximum height not higher than a maximum height of the staple cartridge body when the elastic part is in an initial state, and the elastic part being configured to have a height reduction when the elastic part is driven to move in a distal direction.

[0046] By adopting the firing structure, when the anastomat is fired, the firing structure moves from the proximal end of the cartridge assembly to the distal end, the driving part first abuts against the anastomosis needle and drives the anastomosis needle to rotate and gradually close under the action of the anvil, then the elastic part abuts against the anastomosis needle, the elastic part can assist the anastomosis needle to better close and form, and under the abutting force of the anastomosis needle, the elastic part will be elastically deformed to reduce the height, thereby avoiding other components in the cartridge assembly, so that the movement to the distal end can be continued more smoothly without affecting the normal firing of the anastomat. Moreover, since the highest point of the elastic part is not higher than the highest point of the cartridge body, the elastic part will not interfere with other components in the cartridge assembly during movement. Therefore, the firing structure can further ensure that the anastomosis needle can be completely closed and formed and smoothly separated from the needle hole during firing of the anastomat without affecting the smoothness of the firing of the anastomat.

[0047] The specific structure of the firing structure in each specific embodiment will be specifically introduced below in combination with the drawings. It can be understood that the drawings and the following description are only examples and do not limit the protection scope of the present application. The same reference numerals in the drawings represent the same or similar structures, and thus repeated description thereof will be omitted. In the present application, the distal end and the proximal end are relative to the operator, the end closer to the operator is the proximal end, the end farther from the operator, i.e., the end closer to the surgical position is the distal end, and the direction along the axis of the anastomat is the axial direction, i.e., the direction from the distal end to the proximal end of the anastomat or the direction from the proximal end to the distal end of the anastomat. As shown in FIG. 1, the S1 direction is the direction from the proximal end to the distal end of the anastomat, and the S1 direction or the direction opposite to the S1 direction is defined as the axial direction of the anastomat. The S2 direction in FIG. 1 is defined as the longitudinal direction of the anastomat. The S3 direction in FIG. 3 is defined as the transverse direction of the anastomat. In the present application, for a component, the inner side and the outer side are relative to the axis of the anastomat, the side close to the axis is the inner side, and the side away from the axis is the outer side.

[0048] In different embodiments, the firing structure can have different component structures, for example, in embodiments 1-4, the elastic part of the firing structure is an elastic piece, in embodiments 5 and 6, the elastic part of the firing structure is integrally formed with the driving part, in embodiments 7 and 8, the firing structure mainly includes a first member and a second member, and in embodiments 9 and 10, the firing structure mainly includes a first member, a second member and a third member.

[0049] FIGS. 1-2 show schematic views of a staple cartridge assembly according to an embodiment of the present application. The staple cartridge assembly includes the firing structure, at least one staple, and a staple cartridge body. As shown in FIGS. 1 and 2, in this embodiment, the staple cartridge assembly includes a firing structure 1, a staple band 200, a support 300 supporting the staple band 200, and a staple cartridge cover 100 containing the staple band 200 and the support 300, the firing structure 1 being movable in the axial direction of the stapler in the staple cartridge cover 100. As shown in FIGS. 2 and 4, the staple band 200 includes a staple band body 201 and staples 203 arranged on the side of the staple band body 201, the staples 203 in the same row being aligned in the axial direction, the staple band body 201 serving as a staple cartridge body and cooperating with the staples 203. The staple 203 includes a staple leg 2032 and a staple connecting portion 2031, the staple 203 being rotatably connected to the staple band body 201 through the staple connecting portion 2031. Here, only the structure of a staple cartridge assembly is exemplarily shown. In another alternative embodiment, the staple cartridge assembly can not be provided with a staple band, but a staple cartridge body having a plurality of staple holes formed therein, each staple being separately installed in each staple hole, which is also within the protection scope of the present application.

[0050] As shown in FIG. 2, FIG. 3 and FIG. 4(a), the firing structure 1 comprises a base 13 and at least one pusher 11 arranged on the base 13, the pusher 11 comprises a driving portion 111 and a resilient portion 112. The resilient portion 112 has the ability to elastically deform under external force and can return to the initial state after the external force is removed. The driving portion 111 is a rigid part without elasticity or the driving portion 111 has elasticity but the elasticity is smaller than that of the resilient portion 112. The driving portion 111 and the base 13 are integrally arranged. The proximal end of the base 13 is matched with a cutter assembly (not shown here), and during the firing of the stapler, the cutter assembly can drive the base 13 to move in the distal direction together with the pusher 11. The driving portion 111 is at least partially located on the distal side of the resilient portion 112, and the driving portion 111 is at least partially located on the distal side of the base 13. The base 13 is provided with a mounting groove 131. The resilient portion 112 comprises a mounting portion 1121 and a protruding portion 1122, the mounting portion 1121 is embedded in the mounting groove 131, and the protruding portion 1122 is at least partially protruding above the mounting groove 131. The resilient portion 112 is realized by, for example, a metal spring or a plastic spring. In this embodiment, the number of the driving portions 111 corresponds to the number of the resilient portions 112, and the number of the driving portions 111 is the same as the number of rows of the staples 203, which are respectively used to drive the corresponding staples 203 to close and form. The top of the base 13 is also provided with a cut portion 12 corresponding to the driving portion 111, and the cut portion 12 is located on the proximal side of the pusher 11. The pusher 11, the cut portion 12 and the corresponding staple 203 are axially aligned, and the staple 203 is located on the path of the pusher 11 moving in the distal direction. As shown in FIG. 4(b), when the resilient portion 112 is in the initial state, the highest point height h1 of the resilient portion 112 is lower than or equal to (not higher than) the highest point height h2 of the staple belt body 201, so that the resilient portion 112 will not protrude above the staple belt body 201 to interfere with the cartridge cover, and the movement of the resilient portion 112 in the distal direction will not be hindered by the cartridge cover, ensuring the smoothness of the firing structure 1 during the advancement in the distal direction. Here, the initial state of the resilient portion 112 refers to the state of the resilient portion 112 when the stapler is not fired, and the resilient portion 112 is located on the proximal end of the cartridge assembly with the base 13. As shown in FIG. 1, the proximal end of the cartridge cover 100 is provided with a positioning portion 101, which is opposite to the initial position of the resilient portion 112. As shown in FIG. 4(b), in the initial state, the highest point height h1 of the resilient portion 112 is higher than the highest point height h3 of the driving portion 111. During the firing of the stapler, the resilient portion 112 at least partially abuts against the staple 203 and is subjected to the abutting force of the staple 203, and the resilient portion 112 can elastically deform and lower in height.In this embodiment, the height of the elastic portion 112, the height of the driving portion 111, and the height of the staple belt body 201 each refers to the height of the component relative to the bottom surface of the pusher portion 11 in the height direction of the pusher portion 11, as shown in FIG. 5, the S4 direction is the height direction of the pusher portion 11, and the height direction S4 of the pusher portion 11 has a certain angle relative to the longitudinal direction of the stapler. Specifically, the height direction S4 of each pusher portion 11 is expanded outward at a certain angle relative to the longitudinal direction of the stapler.

[0051] The specific process of the operation of the firing structure 1 during the firing of the stapler will be described below. During the firing of the stapler, the firing structure 1 is driven to move in the distal direction, the driving portion 111 first contacts the anastomosis staples 203, and then drives the anastomosis staples 203 to rotate (in the R direction in FIG. 4(a)) about the staple connecting portions 2031. During the rotation of the anastomosis staples 203, the staple legs 2032 of the anastomosis staples 203 contact the anvil to gradually close and form the anastomosis staples 203 under the action of the anvil. During the movement of the firing structure 1, since the highest point of the elastic portion 112 is lower than or equal to the highest point of the staple belt body 201, the elastic portion 112 does not interfere with the cartridge cover 100 to affect the smoothness of the firing process. The firing structure 1 continues to move in the distal direction until the elastic portion 112 abuts against the rotating anastomosis staples 203. Since the height of the elastic portion 112 is higher than the height of the driving portion 111, the elastic portion 112 can better assist the closing and forming of the anastomosis staples 203, and ensure that the anastomosis staples 203 can be completely closed. At the same time, under the abutting force of the anastomosis staples 203 on the elastic portion 112 in the proximal direction, the elastic portion 112 will be elastically deformed to bend and deform in the proximal direction (in the D1 direction in FIG. 4), so that the height of the elastic portion 112 is reduced. Specifically, after the elastic portion 112 is elastically deformed under the abutting force of the anastomosis staples 203 in the proximal direction, the highest point of the elastic portion 112 is lower than or equal to the lowest point of the staple connecting portion 2031. When the firing structure 1 continues to move in the distal direction, the elastic portion 112 can avoid the staple connecting portion 2031 and smoothly pass below the staple connecting portion 2031. At the same time, after the elastic portion 112 is elastically deformed under the abutting force in the proximal direction, the highest point of the elastic portion 112 is lower than or equal to the highest point of the cutting portion 12. Then, when the firing structure 1 continues to move in the distal direction until the cutting portion 12 contacts the staple connecting portion 2031, the cutting portion 12 cuts the connection between the staple connecting portion 2031 and the staple belt 200, so that the anastomosis staples 203 are separated from the staple belt 200, pass through the staple holes in the cartridge cover 100, and are sutured on the tissue. When the elastic portion 112 moves past a staple connecting portion 2031 to the distal side of the staple connecting portion 2031, the elastic portion 112 is separated from the anastomosis staples 203, the elastic portion 112 is restored to the initial state under the elastic restoring force, and can continue to be used to drive the closing and forming of the next anastomosis staple 203.

[0052] In this embodiment, the firing structure 1 can be provided with a space for allowing the elastic part 112 to move at the proximal end side of the elastic part 112, for example, the proximal end surface of the mounting groove 131 is provided as a slope, so that when the elastic part 112 is subjected to the proximally directed abutting force of the anastomosis needle, the elastic part 112 is more easily bent in the proximal direction to be elastically deformed, and after the elastic part 112 is elastically deformed, at least part of the elastic part 112 enters the space for allowing movement.

[0053] Figs. 5 and 6 are schematic views of the firing structure 1 of the second embodiment of the present application. In this embodiment, the firing structure 1 comprises a base 13 and at least one needle pushing part 11 provided on the base 13, the needle pushing part 11 comprising a driving part 111 and an elastic part 112. The elastic part 112 is realized by, for example, a metal spring or a plastic spring. This embodiment is different from the first embodiment in the structure and mounting mode of the elastic part 112. As shown in Figs. 5 and 6, the base 13 is provided with a first abutting part 133 and a second abutting part 134 at the proximal end side of the driving part 111, the elastic part 112 comprises a first mounting part 11211, a protruding part 1122 and a second mounting part 11212 arranged in sequence, the first mounting part 11211 and the second mounting part 11212 are provided on the base 13 and abut against the first abutting part 133 and the second abutting part 134 respectively, and the position of the base 13 opposite to the protruding part 1122 is provided with a space for allowing movement 132. During the firing process of the anastomat, after the driving part 111 drives the anastomosis needle to rotate, the elastic part 112 abuts against the anastomosis needle and drives the anastomosis needle to be further closed and formed, under the proximally directed abutting force of the anastomosis needle on the elastic part 112, the protruding part 1122 moves in the direction of the space for allowing movement 132 (in the direction of D2 in Fig. 6) to be elastically deformed, so that the height of the elastic part 112 is reduced to smoothly pass the position of the needle connecting part, and then after the elastic part 112 moves to the distal end side of the needle connecting part, the elastic part 112 is separated from the anastomosis needle, and under the action of the elastic restoring force, the elastic part 112 is popped up again to the initial state for the closed driving of the next anastomosis needle.

[0054] Figure 7 is a schematic view of the firing structure 1 of the third embodiment of the present application. In this embodiment, the firing structure 1 comprises a base 13 and at least one pusher 11 arranged on the base 13, the pusher 11 comprising a driving portion 111 and a resilient portion 112. The resilient portion 112 is implemented by a metal spring or a plastic spring, for example. This embodiment differs from the first embodiment in the structure and mounting manner of the resilient portion 112. The resilient portion 112 comprises a mounting portion 1121 and a protruding portion 1122. The base 13 is provided with a mounting groove 131, the mounting portion 1121 is mounted in the mounting groove 131, and the protruding portion 1122 at least partially protrudes above the mounting groove 131, the protruding portion 1122 being a bent portion with a free end 1123, the free end 1123 extending in a proximal direction relative to the mounting portion 1121. A space is formed between the free end 1123 and the cutting portion 12. The driving portion 111 and the corresponding protruding portion 1122 jointly constitute a pusher 11. When the resilient portion 112 is moved to abut against the anastomosis needle and drive the anastomosis needle to further close and form, under the abutting force of the anastomosis needle on the resilient portion 112 in the proximal direction, the free end 1123 of the protruding portion 1122 moves in the proximal direction to cause the resilient portion 112 to elastically deform, so that the height of the resilient portion 112 is reduced to smoothly pass the position of the needle connecting portion, and then the resilient portion 112 moves to the distal side of the needle connecting portion, the resilient portion 112 is separated from the anastomosis needle, and the resilient portion 112 is popped up to the initial state again under the elastic restoring force, for the closure and driving of the next anastomosis needle.

[0055] Fig. 8 and Fig. 9 are schematic views of the firing structure 1 of the embodiment 4 of the present application. In this embodiment, the firing structure 1 comprises a base 13 and at least one pusher 11 arranged on the base 13, the pusher 11 comprising a driving portion 111 and a resilient portion 112. The resilient portion 112 is implemented by a metal spring or a plastic spring, for example. The difference between this embodiment and the embodiment 1 is that the structure and mounting manner of the resilient portion 112 are different. The resilient portion 112 comprises a mounting portion 1121 and a protruding portion 1122. The base 13 is provided with a mounting groove 131, the mounting portion 1121 is mounted in the mounting groove 131, and the protruding portion 1122 at least partially protrudes above the mounting groove 131, the protruding portion 1122 is a bent portion with a free end 1123, the free end 1123 is also located in the mounting groove 131, and a gap is formed between the free end 1123 and the mounting portion 1121, which serves as a displacement space for the deformation of the protruding portion 1122. When the protruding portion 1122 moves to abut against and drive the anastomosis needle to further close and form, under the abutting force of the anastomosis needle on the resilient portion 112 in the proximal direction, the free end 1123 of the protruding portion 1122 moves downward to cause the resilient portion 112 to elastically deform, so that the height of the resilient portion 112 is reduced to smoothly pass the position of the needle connecting portion, then the resilient portion 112 moves to the distal side of the needle connecting portion, the resilient portion 112 is separated from the anastomosis needle, and the resilient portion 112 is popped up upward to the initial state again under the action of the elastic restoring force, for the closure and driving of the next anastomosis needle.

[0056] Figure 10 is a schematic view of a firing structure according to an embodiment of the present application. The firing structure 2 comprises a base 23 configured to be driven to move in a distal direction by a cutter assembly (not shown) at a proximal end side, and at least one pusher 21 disposed at the base 23 at a distal end side of the base 23. The pusher 21 comprises a driving portion 211 and a resilient portion 212. The base 23 is provided with a cutting portion 22 at a top thereof. The driving portion 211 is disposed at least partially at a distal end side of the resilient portion 212. The resilient portion 212 is disposed at a distal end side of the cutting portion 22. The resilient portion 212 is integrally formed with the base 23. The resilient portion 212 comprises a fixed end 2121, a protruding portion 2122 and a free end 2123 disposed in sequence. The fixed end 2121 of the resilient portion 212 is fixed to a proximal end side of the driving portion 211. The free end 2123 of the resilient portion 212 extends in a proximal direction relative to the fixed end 2121. The protruding portion 2122 is an elastically bent portion. The base 23 is provided with a relief slope at a proximal end side of the resilient portion 212 to form a space 231 at the proximal end side of the resilient portion 212. The space 231 allows the resilient portion 212 to elastically deform in the proximal direction when the resilient portion 212 is subjected to a proximally directed resistance force of an anastomosis needle. The resilient portion 212 elastically deforms at least partially into the space 231.

[0057] When the anastomat is not fired, the firing structure 2 is located at the proximal end of the cartridge assembly, the elastic part 212 is in the initial state, the highest point of the elastic part 212 is lower than or equal to the highest point of the staple belt body, and the highest point of the elastic part 212 is higher than the highest point of the driving part 211. When the anastomat is fired, the firing structure 2 is driven to move in the distal direction, the driving part 211 first contacts the anastomat staple, then drives the anastomat staple to rotate around the staple connecting part, and in the process of rotating the anastomat staple, the staple leg of the anastomat staple contacts the anvil, and the anastomat staple is gradually closed and formed under the action of the anvil. During the movement of the firing structure 2, since the highest point of the elastic part 212 is lower than or equal to the highest point of the staple belt body, the elastic part 212 does not interfere with the cartridge cover to affect the smoothness of the firing process. When the elastic part 212 and the rotating anastomat staple abut, the firing structure 2 continues to move in the distal direction, and since the height of the elastic part 212 is higher than the height of the driving part 211, the elastic part 212 can better assist the closure and formation of the anastomat staple to ensure that the anastomat staple can be completely closed. At the same time, under the abutting force of the anastomat staple towards the proximal direction, the elastic part 212 will elastically deform and bend towards the proximal direction, and the free end 2123 will move towards the proximal direction, so that the height of the elastic part 212 is reduced. Specifically, after the elastic part 212 is elastically deformed by the abutting force of the anastomat staple towards the proximal direction, the highest point of the elastic part 212 (the highest point of the protruding part 2122) is lower than or equal to the lowest point of the staple connecting part, and when the firing structure 2 continues to move distally, the elastic part 212 can avoid the staple connecting part and smoothly pass below the staple connecting part. At the same time, after the elastic part 212 is elastically deformed by the abutting force towards the proximal direction, the highest point of the elastic part 212 is lower than or equal to the highest point of the cutting part 22. Then, when the cutting part 22 contacts the staple connecting part while the firing structure 2 continues to move in the distal direction, the cutting part 22 cuts the connection between the staple connecting part and the staple belt, so that the anastomat staple is separated from the staple belt and passes through the staple hole of the cartridge cover to be sutured on the tissue. When the elastic part 212 moves past a staple connecting part to the distal side of the staple connecting part, the elastic part 212 is separated from the anastomat staple, and the elastic part 212 returns to the initial state under the action of the elastic restoring force, and can continue to be used to drive the closure and formation of the next anastomat staple.

[0058] Fig. 11 and Fig. 12 are schematic diagrams of the firing structure of the embodiment 6. The firing structure 2 comprises a base 23 and at least one pusher 21 arranged on the base 23. The pusher 21 comprises a driving portion 211 and a resilient portion 212, and the top of the base 23 is provided with a cutting portion 22. The resilient portion 212 is integrally formed with the driving portion 211 to form an integrated pusher 21. The resilient portion 212 comprises a fixed end 2121, a protruding portion 2122 and a free end 2123 arranged in sequence, and the protruding portion 2122 is an elastic bending portion. The fixed end 2121 of the resilient portion 212 is integrally connected with the driving portion 211, and the free end 2123 of the resilient portion 212 extends towards the proximal end relative to the fixed end 2121. The base 23 is provided with a relief slope on the proximal side of the resilient portion 212 to form a space 231 on the proximal side of the resilient portion 212, so that the resilient portion 212 has a space for elastic deformation towards the proximal end when subjected to a resisting force towards the proximal end. The number of the pushers 21 is the same as the number of rows of anastomosis needles, and only the pusher 21 on the outer side is exemplarily shown. The cooperation mode of the pusher 21 of this embodiment with the anastomosis needle is similar to that of the embodiment 5. During the firing process of the anastomosis device, after the driving portion 211 drives the anastomosis needle to rotate, the resilient portion 212 abuts against and drives the anastomosis needle to further close and form, under the resisting force of the anastomosis needle towards the proximal end, the free end 2123 of the resilient portion 212 moves towards the proximal end to cause the resilient portion 212 to elastically deform, so that the height of the resilient portion 212 is reduced to smoothly pass through the position of the needle connecting portion, and then the resilient portion 212 moves to the distal side of the needle connecting portion, the resilient portion 212 is separated from the anastomosis needle, and the resilient portion 212 is also elastically restored to the initial state under the action of the elastic restoring force, so as to drive the closure of the next anastomosis needle.

[0059] As shown in Fig. 11 and Fig. 12, the side surface of the resilient portion 212 is provided with a limiting portion 2124, which is a stepped portion arranged on the inner side surface of the resilient portion 212. The upper surface of the limiting portion 2124 abuts against the needle belt body 201 to avoid the height of the resilient portion 212 being too high to interfere with the needle cartridge cover and affect the smoothness of the axial movement of the firing structure 2, and the limiting portion 2124 can keep the stability of the relative position between the needle belt body 201 and the firing structure 2 to avoid the transverse displacement of the firing structure 2 relative to the needle belt body 201. The limiting portion 2124 can also be arranged on the driving portion 211 or the base 23 to keep the stability of the relative position between the needle belt body 201 and the firing structure 2 to avoid the transverse displacement of the firing structure 2 relative to the needle belt body 201. The limiting portion 2124 can also be applied to the firing structures of other embodiments and arranged on the driving portion, the resilient portion or the base of the firing structures of other embodiments, which all belong to the protection scope of the present application.

[0060] Figs. 13 and 14 show schematic diagrams of the firing structure 3 of the embodiment 7 of the present application. In this embodiment, the firing structure 3 comprises a base 33 and at least one pusher portion arranged on the base 33, the base 33 is configured to be driven to move in the distal direction by cooperating with a cutter assembly (not shown in the figures) on the proximal end side, and the pusher portion is at least partially located on the distal end side of the base 33. The pusher portion comprises a first pusher portion 31a and a second pusher portion 31b, and the first pusher portion 31a comprises a first driving portion 311a and a first elastic portion 312a which are integrally formed, and the first driving portion 311a is at least partially located on the distal end side of the first elastic portion 312a. The second pusher portion 31b comprises a second driving portion 311b and a second elastic portion 312b which are integrally formed, and the second driving portion 311b is at least partially located on the distal end side of the second elastic portion 312b. The top of the base 33 is provided with a cutting portion 32, and the cutting portion 32 is located on the proximal end side of the first elastic portion 312a and the second elastic portion 312b. The firing structure 3 is composed of a first member (the first pusher portion 31a) and a second member (the second pusher portion 31b, the base 33 and the cutting portion 32) which are relatively independent and connected to each other. The first pusher portion 31a is provided with a first assembly portion 313a, and the base 33 is provided with a second assembly portion 331. The first member and the second member are connected through the first assembly portion 313a and the second assembly portion 331, the base 33 is connected to the proximal end side of the first pusher portion 31a, and the second pusher portion 31b is located on the outer side of the first pusher portion 31a. In this embodiment, the first assembly portion 313a is a protrusion, and the second assembly portion 331 is a mounting hole, the protrusion is inserted into the mounting hole from top to bottom, in other alternative embodiments, the first assembly portion can be a mounting hole, and the second assembly portion can be a protrusion, or the first assembly portion and the second assembly portion adopt other structures and cooperation modes, which all belong to the protection scope of the present application. The first pusher portion 31a and the second pusher portion 31b are respectively used for pushing the corresponding row of anastomosis staples. When the firing structure 3 moves in the distal direction to the first pusher portion 31a contacts the anastomosis staples, the first driving portion 311a first contacts and drives the anastomosis staples to rotate, then the first elastic portion 312a contacts and drives the anastomosis staples to further close and form, the first elastic portion 312a is elastically deformed and lowered in height by the proximal direction resistance of the anastomosis staples, the first elastic portion 312a passes below the staple connecting portion, the cutting portion 32 cuts the connection between the staple connecting portion and the staple belt body to make the anastomosis staples separate from the staple belt body, after the first elastic portion 312a separates from the anastomosis staples, the first elastic portion 312a returns to the initial state under the elastic restoring force to drive the next anastomosis staple. The working principle of the second pusher portion 31b is the same as that of the first pusher portion 31a, which is not described here.

[0061] FIGS. 15 and 16 are schematic views of the firing structure 4 of the embodiment 8 of the present application. In this embodiment, the firing structure 4 comprises a base 43 and at least one pusher 41 provided on the base 43, the base 43 is configured to be driven to move in the distal direction in cooperation with a cutter assembly (not shown) on the proximal side, and the pusher 41 is at least partially located on the distal side of the base 43. The pusher 41 is provided with a first assembly portion 413, and the pusher 41 comprises an integral driving portion 411 and an elastic portion 412, the driving portion 411 is at least partially located on the distal side of the elastic portion 412. The base 43 is provided with a second assembly portion 431, and the top of the base 43 is provided with a cutting portion 42, the cutting portion 42 is located on the proximal side of the elastic portion 412. Therefore, the firing structure 4 is composed of a first member (the pusher 41) and a second member (the base 43 and the cutting portion 42) which are relatively independent and connected to each other, and the first member and the second member are connected through the first assembly portion 413 and the second assembly portion 431. In this embodiment, the first assembly portion 413 is a mounting hole, and the second assembly portion 431 is a mounting column, and the mounting column is arranged in the mounting hole in the horizontal direction. The present application is not limited thereto, and in other alternative embodiments, the first assembly portion can be a mounting column, and the second assembly portion can be a mounting hole, or the first assembly portion and the second assembly portion can adopt other structures and cooperation modes, which all belong to the protection scope of the present application. The cooperation mode of the firing structure 4 of this embodiment with the anastomosis needle is the same as that of the embodiment 6, and details are not described herein.

[0062] Figs. 17-19 show schematic diagrams of the firing structure 5 of the present application in embodiment 9. In this embodiment, the firing structure 5 comprises a base 53 and at least one pusher portion arranged on the base 53, the base 53 is configured to be driven to move towards the distal end by cooperating with a cutter assembly (not shown) on the proximal end side, and the pusher portion is at least partially located on the distal end side of the base 53. The pusher portion comprises a first pusher portion 51a and a second pusher portion 51b, and the first pusher portion 51a comprises a first driving portion 511a and a first elastic portion 512a which are integrally formed, and the first driving portion 511a is at least partially located on the distal end side of the first elastic portion 512a. The second pusher portion 51b comprises a second driving portion 511b and a second elastic portion 512b which are integrally formed, and the second driving portion 511b is at least partially located on the distal end side of the second elastic portion 512b. The first elastic portion 512a and the second elastic portion 512b are respectively elastic arms which extend towards the proximal end side and are suspended. The top of the base 53 is further provided with a cutting portion 52. The firing structure 5 is composed of a first member (the first pusher portion 511a), a second member (the second pusher portion 51b and the base 53), and a third member (the cutting portion 52) which are relatively independent and connected to each other. The first pusher portion 51a is provided with a first assembly portion 513a and a third assembly portion 514a, and the base 53 is provided with a second assembly portion 533, a fourth assembly portion 534, a fifth assembly portion 535, and a first limiting structure 536. The first assembly portion 513a is a first mounting column, the second assembly portion 533 is a first mounting hole which is fitted with the first mounting column, the third assembly portion 514a is a second mounting hole, and the fourth assembly portion 534 is a second mounting column which is fitted with the third assembly portion 514a. By arranging two pairs of assembly structures, the stability of the connection and cooperation between the first member and the second member can be improved. The cutting portion 52 comprises a sixth assembly portion 521 and a second limiting structure 522. The fifth assembly portion 535 is a third mounting column, and the sixth assembly portion 521 is a mounting hole which is fitted with the third mounting column, so that the third member is mounted on the proximal end side of the second member. The first limiting structure 536 and the second limiting structure 522 are fitted with each other to block the lateral movement of the cutting portion 52 relative to the base 53. In this embodiment, the first limiting structure 536 and the second limiting structure 522 are respectively wave-shaped structures which are staggered and fitted with each other. The first member and the second member can respectively be plastic parts, and the third member can be a metal part, so as to improve the hardness of the cutting portion 52, and when the cutting portion 52 abuts against the connecting portion of the anastomosis needle, the connection between the connecting portion and the body of the anastomosis needle is more easily cut off. The cooperation mode of the firing structure 5 of this embodiment with the anastomosis needle is the same as that of embodiment 7, and details are not described herein.

[0063] FIG. 20 and FIG. 21 show schematic diagrams of the firing structure 5 of the embodiment 10 of the present application. The difference between this embodiment and the embodiment 9 is that the distal end of the cutting portion 52 is provided with a support portion 523. Since the cutting portion 52 is made of a metal material with high hardness, the support portion 523 is abutted against the proximal end side of the first driving portion 511a and the second driving portion 511b, which can further improve the structural stability of the first driving portion 511a and the second driving portion 511b. The first elastic portion 512a and the second elastic portion 512b are elastic arms which extend proximally and are suspended relative to the first driving portion 511a and the second driving portion 511b respectively. When the elastic arms are subjected to the proximally directed abutting force of the anastomosis needle, the elastic arms will move downward to be elastically deformed and reduce the height. The cooperation between the firing structure 5 of this embodiment and the anastomosis needle is the same as that of the embodiment 7, which will not be described here.

[0064] The above further describes the present application in details in combination with specific preferred embodiments, and the specific implementation of the present application should not be limited to these descriptions. For ordinary skilled in the art to which the present application belongs, several simple deductions or replacements can be made without departing from the concept of the present application, which should be regarded as falling within the protection scope of the present application.

Claims

1. A firing structure, characterized by, A staple cartridge assembly for a surgical stapler and can be driven to move along an axial direction of the surgical stapler, the staple cartridge assembly comprising a staple cartridge body, the firing structure comprising a base and a pusher arranged on the base, the pusher comprising a driving portion and an elastic portion, the driving portion being at least partially located on a distal side of the elastic portion, the elastic portion being in an initial state, a highest point of the elastic portion being not higher than a highest point of the staple cartridge body, and the elastic portion being configured to be driven to move in a distal direction and to be elastically deformed to lower the height when the elastic portion is driven to move in the distal direction.

2. The firing structure of claim 1, wherein, The staple cartridge assembly further comprises at least one staple, the staple being rotatably connected to the staple cartridge body through a staple connecting portion, the staple being aligned along an axial direction, and the staple being axially aligned with the pusher. The firing structure is driven to move in the distal direction to make the elastic portion abut against the at least one staple, after the elastic portion is elastically deformed by the abutting force of the staple, a highest point of the elastic portion is lower than or equal to a lowest point of the staple connecting portion, and after the firing structure continues to move in the distal direction to be separated from the staple, the elastic portion returns to the initial state.

3. The firing structure of claim 1, wherein, The elastic portion is in the initial state, and a highest point of the elastic portion is higher than a highest point of the driving portion.

4. The firing structure of claim 1, wherein, The firing structure is provided with a space on a proximal side of the elastic portion, so that the deformed elastic portion can enter the space.

5. The firing structure of claim 1, wherein, The base is further provided with a cutting portion, the cutting portion being located on a proximal side of the pusher, and after the elastic portion is elastically deformed, a highest point of the elastic portion is lower than or equal to a highest point of the cutting portion.

6. The firing structure of claim 1, wherein, The elastic portion is an elastic member, and the elastic member is mounted on the base.

7. The firing structure of claim 6, wherein, The base is provided with a mounting groove, the driving portion is at least partially located on a distal side of the mounting groove, the elastic member comprises a protruding portion and a mounting portion, the mounting portion is embedded in the mounting groove, and the protruding portion is at least partially protruded above the mounting groove.

8. The firing structure of claim 6, wherein, The base is provided with a first abutting portion and a second abutting portion on a proximal side of the driving portion, the elastic member comprises a first mounting portion, a protruding portion and a second mounting portion arranged in sequence, the first mounting portion and the second mounting portion are arranged on the base and abut against the first abutting portion and the second abutting portion respectively, and the base is provided with a space on a position opposite to the protruding portion.

9. The firing structure of claim 1, wherein, The elastic portion is integrally formed with the driving portion and / or the base.

10. The firing structure of claim 9, wherein, The elastic portion comprises a fixed end, a protruding portion and a free end arranged in sequence, the fixed end of the elastic portion is fixed to the driving portion, and the free end of the elastic portion extends in a proximal direction relative to the fixed end.

11. The firing structure of claim 1, wherein, The pusher comprises a first pusher and a second pusher, the second pusher is arranged on a distal side of the base, the first pusher is connected to the base through a first assembly portion, and the second pusher is located on an outer side of the first pusher.

12. The firing structure of claim 1, wherein, The pusher is provided with a first assembly portion, the base is provided with a second assembly portion, the first assembly portion and the second assembly portion are connected to fix the pusher to the base.

13. The firing structure of claim 11 or 12, wherein, The base portion is provided with a third assembly portion and a first limiting structure, and the cutting portion is provided with a fourth assembly portion and a second limiting structure, the fourth assembly portion is connected with the third assembly portion to fix the cutting portion on the base portion, the cutting portion is at least partially located on the proximal end side of the pusher portion, and the first limiting structure and the second limiting structure are embedded to block the transverse movement of the cutting portion relative to the base portion.

14. A staple cartridge assembly comprising: The firing structure of any one of claims 1 to 13.

15. A surgical stapler, comprising: The cartridge assembly of claim 14.

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