CN219207107U - Nail head and surgical stapler - Google Patents

Abstract

The application provides a nail head and surgical stapler, the nail head includes: a first jaw and a second jaw disposed opposite each other; a connector connected to proximal sides of the first jaw and the second jaw; a stopper rotatably mounted to the connection member and including a first stopper portion; the firing mechanism can move along the axial direction of the anastomat and comprises a second stop part; when the stop piece is in the first state, the first stop part is positioned on a path of the second stop part moving towards the distal end side direction, so that false firing of the anastomat can be effectively avoided; when the first stop part moves away from the axis direction of the anastomat, the stop part enters a second state, and the first stop part is separated from the path of the second stop part moving towards the far end side direction, so that the anastomat can be normally triggered.

Description

Nail head and surgical stapler

Technical Field

The application relates to the technical field of medical instruments, in particular to a nail head and a surgical anastomat.

Background

In the prior art, a surgical stapler comprises a stapler body, an operating handle movably connected with the stapler body, and a nail head matched with the stapler body. The inside of the anastomat body is provided with a transmission mechanism. The nail head comprises a nail bin assembly, a nail anvil assembly and a cutter capable of moving in the nail head, wherein the nail bin assembly and the nail anvil assembly are oppositely arranged, and a firing block is arranged in the nail bin assembly. In the operation process, tissues are placed between the nail anvil assembly and the nail bin assembly, the distance between the nail anvil assembly and the nail bin assembly is adjusted to gradually clamp the tissues, then the operation handle is held, the cutter is driven to move towards the distal side direction through the transmission mechanism, the cutter drives the firing block to move, so that the anastomat is pushed out and formed on the nail anvil, and meanwhile, the cutter cuts the tissues, and anastomosis and cutting of the tissues are completed.

After one firing, the existing anastomat has all the anastomat nails in the nail bin are nailed on the tissues, and the nail bin needs to be replaced to perform the next firing. Before the staple cartridge is replaced, if the surgeon holds the operating handle again due to unskilled or careless handling, the cutter is driven to move in the distal direction again by the transmission mechanism, and only the tissue is cut without suturing, resulting in failure of the operation. Therefore, it is desirable to provide a structure that avoids a secondary false firing after one firing of the stapler without replacing the staple cartridge.

Disclosure of Invention

Aiming at the problems in the prior art, the purpose of the application is to provide a nail head and a surgical stapler, wherein the stopper can block the movement of a firing mechanism to the distal side direction when entering the first state, so that the false firing of the stapler can be effectively avoided, and the stopper can normally fire the stapler without blocking the movement of the firing mechanism when entering the second state.

The embodiment of the application provides a nail head for surgical anastomat, the nail head includes:

a first jaw and a second jaw disposed opposite each other;

a connector connected to proximal sides of the first jaw and the second jaw;

a stopper rotatably mounted to the connection member and including a first stopper portion;

the firing mechanism can move along the axial direction of the anastomat and comprises a second stop part;

when the stop piece is in a first state, the first stop part is positioned on a path along which the second stop part moves towards the distal end side; when the first stop part moves away from the axis of the anastomat, the stop part enters a second state, and the first stop part is separated from a path of the second stop part moving towards the far end side.

In some embodiments, the distal end of the connecting piece is provided with a mounting part for mounting the stop piece, and the mounting part is at least partially arranged on one side of the second stop part away from the axis of the anastomat when the first jaw and the second jaw are in an open state; the first stop portion and the second stop portion are provided with a first distance in the axial direction.

In some embodiments, the stopper further includes a pivot portion rotatably mounted to the mounting portion through a pin, and when the stopper is in the first state, the first stopper portion protrudes toward an axial direction of the stapler with respect to the pivot portion.

In some embodiments, the stapler further comprises a drive member disposed on the first jaw and movable in an axial direction of the stapler, the first jaw being rotatable relative to the connecting member;

the drive member is located at a proximal side of the first jaw and when the first jaw rotates to be relatively closed with the second jaw, the drive member abuts the stop member and drives the stop member from the first state into the second state.

In some embodiments, the firing mechanism moves a second distance in a distal direction when the stop moves from the first state to the second state, the first distance being greater than or equal to the second distance.

In some embodiments, a first driving part is arranged on the proximal end side of the driving part, and a second driving part matched with the first driving part is arranged on the side, facing the axis of the anastomat, of the stopping part.

In some embodiments, opposite sides of the first and second driving parts are provided with first and second guide surfaces, respectively.

In some embodiments, the first stop portion and the second driving portion are integrally provided, and when the stop member is in the first state, a side of the first stop portion facing the first jaw is the second guide surface.

In some embodiments, the firing mechanism includes a cutter and a pusher bar, the distal end of the cutter is provided with the second stop, and the proximal end of the cutter is connected to the pusher bar.

In some embodiments, the stop is in the second state and is maintained in the second state at least partially against a side of the pusher bar as the firing mechanism is moved in a distal direction.

In some embodiments, the device further comprises a resilient member configured to apply a biasing force to the stop member that causes it to rotate in a second direction, the second direction being opposite the first direction.

In some embodiments, the mounting portion is provided with a mounting groove opening in the axial direction of the stapler, and the stopper at least partially enters the inside of the mounting groove.

In some embodiments, the elastic member is a torsion spring provided at the pin shaft, or a compression spring provided between the stopper and an inner wall of the mounting groove.

In some embodiments, the connecting piece comprises a first limiting part, the mounting groove is provided with a second limiting part, and the first limiting part and the second limiting part are matched to limit the rotation angle of the connecting piece along the second direction; and/or the number of the groups of groups,

the connecting piece further comprises a third limiting part, the stop piece comprises a fourth limiting part, and the third limiting part and the fourth limiting part are matched to limit the rotation angle of the connecting piece along the first direction.

In some embodiments, a compression spring channel is arranged in the mounting groove, the compression spring is movably arranged in the compression spring channel, the compression spring channel is perpendicular to the side wall of the firing mechanism, and the axial width of the compression spring channel is larger than that of the mounting groove.

The embodiment of the application also provides a surgical stapler comprising the nail head.

The nail head and the surgical stapler provided by the application have the following advantages:

through adopting this application, when the anastomat satisfied the firing condition, the backstop piece got into the second state and did not stop the motion of firing mechanism, and firing mechanism can be driven to distal end side direction motion, and normally fire the anastomat, after the anastomat was launched and is accomplished, the backstop piece got into the first state, through the cooperation of first backstop portion and second backstop portion, effectively stopped the firing mechanism to distal end side direction motion, can effectively avoid the secondary mistake of anastomat to fire, effectively promoted the operation effect.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings.

FIGS. 1 and 2 are schematic views of the mating of the staple head and sleeve of a first embodiment of the present application;

FIG. 3 is a schematic illustration of the first embodiment of the present application omitting the cooperation of the anvil housing rear staple head and sleeve;

FIG. 4 is a top view of the staple head of the first embodiment of the present application;

FIG. 5 is a cross-sectional view taken along the direction A-A in FIG. 4;

FIGS. 6 and 7 are schematic views of the coupling and stop engagement of the first embodiment of the present application;

FIG. 8 is a schematic structural view of a stopper according to a first embodiment of the present application;

fig. 9 is a schematic structural view of a connector according to a first embodiment of the present application;

FIG. 10 is a schematic view of the stop cooperating with the firing mechanism in a first state of the first embodiment of the present application;

FIG. 11 is a schematic view of the stop of the first embodiment of the present application in a first state engaged with a cutter;

FIG. 12 is a schematic view of the stop cooperating with the firing mechanism after the stapler of the first embodiment of the present application is closed;

fig. 13 is a schematic structural view of a driving member of the first embodiment of the present application;

FIG. 14 is a schematic view of the drive and stop cooperation of the first embodiment of the present application;

figure 15 is a schematic view of the stop of the first embodiment of the present application in a second state mated with the cutter;

FIG. 16 is a schematic view of a stop cooperating with a firing mechanism during firing of the stapler of the first embodiment of the present application;

FIG. 17 is a schematic view of the stop cooperating with the firing mechanism after firing of the stapler of the first embodiment of the present application is completed;

FIG. 18 is a schematic view of a stop member and connector engagement of a second embodiment of the present application;

FIG. 19 is a schematic view of the structure of a connector according to a second embodiment of the present application;

fig. 20 is a sectional view in the direction B-B of fig. 18.

Reference numerals:

1. first guide surface of cartridge assembly 411

11. Staple cartridge 5 stop

12. First stop portion of cartridge rack 51

121. Second limit part of second feed slot 52

2. Fourth limit part of nail anvil component 53

21. Pivoting portion of anvil body 54

211. First feed groove 55 second drive part

22. Second guide surface of anvil housing 551

3. Connecting piece 6 cutter

30. First cross member of mounting portion 61

31. Attachment groove 62 connection portion

32. A first stop portion 621 and a second stop portion

33. Third limit part 63 second beam

34. Mounting hole 7 push rod

35. Compression spring channel 81 torsion spring

36. Pin 82 pressure spring

4. Drive 9 sleeve

41. A first driving part

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted. "or", "or" in the specification may each mean "and" or ". Although the terms "upper", "lower", "between", etc. may be used in this specification to describe various example features and elements of the present application, these terms are used herein for convenience only, e.g., in terms of the orientation of the examples depicted in the drawings. Nothing in this specification should be construed as requiring a particular three-dimensional orientation of the structure to fall within the scope of this application. Although the terms "first" or "second" etc. may be used herein to describe certain features, these features should be interpreted in a descriptive sense only and not for purposes of limitation as to the number and importance of the particular features.

The application provides a nail head for a surgical anastomat and the surgical anastomat comprising the same. The surgical anastomat comprises an anastomat body, an operation handle and a nail head part arranged at the far end of the anastomat body, when the firing condition of the anastomat is met, the operation handle is held, and the actuating force can be transmitted to the nail head part through a transmission mechanism in the anastomat body, so that the nail head part can finish tissue suturing and cutting actions. The nail head part comprises a first clamp, a second clamp, a connecting piece, a stop piece and a firing mechanism which are oppositely arranged. Wherein the connector is connected to proximal sides of the first jaw and the second jaw. The stop is rotatably mounted to the connector and includes a first stop. The firing mechanism is movable in an axial direction of the stapler and includes a second stop.

When the stop piece is in the first state, the first stop piece is positioned on a path of the second stop piece moving towards the distal end side direction, so that the movement of the firing mechanism towards the distal end side direction is blocked, the anastomat cannot be fired, and the false firing of the anastomat is effectively avoided. When the first stop part moves away from the axis direction of the anastomat, the stop part enters a second state, the first stop part is separated from the path of the second stop part moving towards the distal direction, and at the moment, the firing mechanism can be driven to move towards the distal direction, so that the anastomat is normally fired.

The structure of the nail head of various embodiments of the present application will be described in detail below with reference to the accompanying drawings, with the understanding that the various embodiments are not intended as limitations on the scope of the present application.

Fig. 1 to 17 show the structure of a nail head according to a first embodiment of the present application. As shown in fig. 1 to 5, the nail head comprises a first jaw, a second jaw and a connecting piece 3 which are oppositely arranged, and the nail head is arranged at the distal end of a sleeve 9 of the anastomat body. The first and second jaws form a jaw therebetween, one of which is typically in a fixed state and the other of which is relatively open and relatively closed with respect to the fixed jaw. In this embodiment, the second jaw is taken as a fixed jaw, the first jaw is movable, and the first jaw is provided with a cartridge assembly 1, and the second jaw is taken as an anvil assembly 2 for illustration. The cartridge assembly 1 includes a cartridge housing 12 and a cartridge 11 containing staples therein. The anvil assembly 2 includes an anvil housing 22 and an anvil body 21. The proximal sides of the cartridge assembly 1 and the anvil assembly 2 are connected to the connector 3, and the cartridge assembly 1 is rotatable with respect to the connector 3 such that the cartridge assembly 1 has an open state and a closed state with respect to the anvil assembly 2, i.e. the head has an open state and a closed state of the jaws.

In the present application, the distal side and the proximal side are the proximal side with respect to the operator, the side closer to the operator, the side farther from the operator, i.e. the side closer to the surgical site, the distal side, the direction along the axis of the stapler being the axial direction, i.e. the direction from the distal side to the proximal side of the stapler, or the direction from the proximal side to the distal side of the stapler. The direction S1 in fig. 1 is defined as the direction from the distal end side to the proximal end side of the stapler, and the direction S1 or the direction opposite to the direction S1 is defined as the axial direction. The S3 direction in fig. 5 is the longitudinal direction, i.e., the height direction. The S2 direction in fig. 11 is the lateral direction, i.e., the width direction. In fig. 1, the S0 direction is the axial direction of the stapler. For one part, the side of the part, which is close to the axis of the anastomat, is the inner side, and the side, which is far away from the axis of the anastomat, is the outer side.

The nail head part further comprises a firing mechanism, the firing mechanism comprises a cutter 6 and a push knife rod 7, the distal end of the push knife rod 7 is connected to the proximal end side of the cutter 6, and the push knife rod 7 can be driven to drive the cutter 6 to move along the axial direction of the anastomat. The cutter 6 comprises a first beam 61, a connecting part 62 and a second beam 63 which are sequentially arranged from top to bottom, and the upper distal end of the connecting part 62 is a cutting edge for cutting tissues. The connecting part 62 enters the first feeding groove 211 of the anvil body 21 and the second feeding groove 121 of the cartridge frame 12, respectively, and the first beam 61 and the second beam 63 cooperate with the anvil body 21 and the cartridge frame 12, respectively. As shown in fig. 5, the cutter 6 has three positions 6a, 6b and 6c when it is located at the proximal side. The cutter 6 is located at a proximal position 6a of the cartridge assembly 1 when the cartridge assembly 1 is opened relative to the anvil assembly 2. The operating handle is held to drive the cutter blade 6 to move in the distal direction by the push rod 7 to the position 6b, and the cartridge assembly 1 is gradually closed relative to the anvil assembly 2. After the jaw of the nail head is closed, the cutter 6 is driven by the push knife rod 7 to move to the far end of the nail bin assembly 1 in the far end side direction continuously, and the firing of the anastomat is completed.

As shown in fig. 6 to 11, the nail head further includes a stopper 5, the stopper 5 includes a first stopper 51, and a second stopper 621 is correspondingly disposed at the distal end of the cutter 6. The distal end of the connector 3 is provided with a mounting portion 30 for mounting the stopper 5. When the cartridge assembly 1 is opened relative to the anvil assembly 2, the mounting portion 30 is at least partially located on a side of the second stop portion 621 away from the axis of the stapler, and the mounting portion 30 is at least partially located on a lateral side of the second stop portion 621. The mounting portion 30 is provided with a mounting groove 31 which is opened toward the axial direction of the stapler, and the stopper 5 is at least partially inserted into the mounting groove 31. The mounting portion 30 has a mounting hole 34 therein, and the stopper 5 has a pivot portion 54, and the pivot portion 54 is rotatably mounted to the mounting hole 34 of the mounting portion 30 through a pin 36.

The stopper 5 has a first state and a second state, fig. 10 and 11 show the cooperation of the stopper 5 and the cutter 6 in the first state, and fig. 15 shows the cooperation of the stopper 5 and the cutter 6 in the second state. As shown in fig. 10 and 11, when the stop member 5 is in the first state, the first stop portion 51 is located on the path along which the second stop portion 621 moves in the distal direction, so as to block the movement of the cutter 6 in the distal direction, and thus the stapler cannot be fired, and false firing of the stapler is effectively avoided. As shown in fig. 15, when the stopper 5 is rotated relative to the connector 3 by an external force in a first direction, so that the first stopper 51 moves away from the axis of the stapler, the stopper 5 enters a second state, the first stopper 51 is separated from the path of the second stopper 621 moving in the distal direction, and at this time, the cutter 6 can be driven to move in the distal direction, and normally fire the stapler. In the view of fig. 11, the first direction is clockwise.

The mounting groove 31 is provided therein with an elastic member configured to apply a biasing force to the stopper 5 to rotate in a second direction opposite to the first direction, which is counterclockwise in the view of fig. 11. Therefore, when the stopper 5 is not subjected to an external force driving it to rotate in the first direction, the stopper 5 is held in the first state by the elastic member. In this embodiment, as shown in fig. 6, the elastic member is a torsion spring 81 sleeved on the pin 36. When the stopper 5 is driven to rotate in the first direction by an external force to enter the second state, the torsion spring 81 is driven to elastically deform, and after the external force applied to the stopper 5 is eliminated, the stopper 5 rotates in the second direction under the action of the elastic deformation restoring force of the torsion spring 81 to restore to the first state from the second state.

As shown in fig. 7 to 10, the connector 3 includes a first limit portion 32 and a third limit portion 33, and the stopper 5 is provided with a second limit portion 52 and a fourth limit portion 53. The positions of the second limiting portion 52 and the fourth limiting portion 53 are respectively adapted to the first limiting portion 32 and the second limiting portion 33. The second limiting portion 52 and the fourth limiting portion 53 are located on both sides of the pivoting portion 54 in the longitudinal direction, that is, above and below the pivoting portion 54, respectively. The second stopper 52 protrudes in a direction away from the axis of the stapler than the pivot 54. The second limiting portion 52 may also serve to strengthen the overall structural strength of the stopper 5. The first limiting portion 32 is a step portion corresponding to the shape of the second limiting portion 52, and the extending direction of the upper surface of the step portion is crossed with the extending direction of the third limiting portion 33. The first limiting portion 32 and the second limiting portion 52 cooperate to limit the rotation angle of the connecting piece 3 along the second direction. When the stopper 5 rotates in the second direction under the action of the torsion spring 81, the first limiting portion 32 limits the rotation travel of the second limiting portion 52, so as to avoid an excessive rotation angle of the stopper 5. The fourth limiting portion 53 is a side wall of the stopper 5, which is far away from an axial side of the anastomat, and the third limiting portion 33 is an inner wall of the mounting groove 31, which is far away from the axial side of the anastomat. In this embodiment, the surface of the first stopper 32 opposite to the second stopper 52 is substantially perpendicular to the longitudinal direction, and the extending direction of the third stopper 33 is substantially parallel to the longitudinal direction. The third limiting portion 33 and the fourth limiting portion 53 cooperate to limit the rotation angle of the stopper 5 in the first direction. When the stopper 5 is rotated in the first direction by the external force, the third limiting portion 33 limits the rotation stroke of the fourth limiting portion 53, so as to avoid an excessive rotation angle of the stopper 5. In another alternative embodiment, the mounting portion 30 of the connector 3 may not be provided with the mounting groove 31, but the stopper 5 may be directly rotatably mounted on the side or distal end surface of the mounting portion 30, which is also within the scope of the present application.

In this embodiment, the switching of the stop 5 from the first state to the second state is driven by the drive 4. The driving piece 4 is a firing block arranged on the nail bin assembly 1. The proximal end side of the driving member 4 is provided with a first driving portion 41, and the side of the stopper 5 facing the axis of the stapler is provided with a second driving portion 55 cooperating with the first driving portion 41. The opposite sides of the first driving part 41 and the second driving part 55 are respectively provided with a first guiding surface 411 and a second guiding surface 551. The first guide surface 411 is an inclined surface located above the first driving portion 41. In this embodiment, the first stopper 51 and the second driving part 55 are integrally provided, that is, as shown in fig. 11, a projection protruding toward the cutter 6 serves as the first stopper 51 and the first driving part 41. When the stopper 5 is in the first state, the side of the first stopper 51 facing the cartridge assembly 1 is the second guide surface 551, and the second guide surface 551 is inclined with respect to both the longitudinal direction and the axial direction.

As shown in fig. 5 and 12-15, when the cartridge assembly 1 is opened relative to the anvil assembly 2, the driver 4 is located on the proximal side of the cartridge assembly 1, but since the cartridge assembly 1 is located away from the anvil assembly 2, the driver 4 is located at position 4a in fig. 5 without contacting the stopper 5, the stopper 5 being in the first state under the influence of the torsion spring 81. The cutter 6 is located at a position 4a on the proximal end side of the stopper 5, and the second stopper 621 has a first distance in the axial direction from the first stopper 51 of the stopper 5. When the cutter 6 moves a second distance in the distal direction to the position 6b, the cartridge assembly 1 gradually approaches the anvil assembly 2, closing the jaws, and the driver 4 moves with the cartridge assembly 1 to the position 4b. Since the first distance is greater than the second distance, the distance between the proximal side of the driver 4 and the distal side of the cutter 6 has an axial third distance, i.e. the distance between the position 4b and the position 6b, which is substantially equal to the first distance-the second distance. In another embodiment, the second distance may be equal to the first distance, when the proximal side of the driving member 4 abuts against the distal side of the cutter 6. When the driver 4 moves from the position 4a to the position 4b, the first driving part 41 of the driver 4 moves to the stop 5 to abut against the second driving part 55, and drives the stop 5 to rotate in the first direction, and the first stop part 51 moves away from the axis of the stapler, so that the stop 5 enters the second state.

The working principle of the stop 5 in the different states is described in more detail below with reference to fig. 5 and 10 to 17.

When the cartridge assembly 1 is opened relative to the anvil assembly 2, the driver 4 is located at a position 4a on the proximal side of the cartridge assembly 1, without contacting the stopper 5. The cutter 6 is located at a position 6a on the proximal side of the cartridge assembly 1. As shown in fig. 10 and 11, the stopper 5 is not biased by the driving member 4, the stopper 5 is held in the first state by the torsion spring 81, and the first stopper 51 is located on the distal path of the second stopper 621. The cutter 6 is located at the proximal end side of the stopper 5 with a first distance in the axial direction between the second stopper 621 and the first stopper 51 of the stopper 5.

When the head is placed in the surgical site, the jaws need to be closed to clamp tissue. At this time, when the operating handle is held and the pusher bar 7 and the cutter 6 are driven to move in the distal direction by the transmission mechanism for a second distance to the position 6b, the cartridge assembly 1 gradually approaches the anvil assembly 2 to close the jaw, the driving member 4 moves to the position 4b along with the cartridge assembly 1, and at this time, a third distance is provided between the proximal side of the driving member 4 and the distal side of the cutter 6. As shown in fig. 12 and 14, during the closing process of the jaws, the first driving portion 41 of the driving member 4 abuts against the second driving portion 55 of the stopping member 5, the stopping member 5 is driven to rotate in the first direction, the first stopping portion 51 moves in a direction away from the axis of the anastomat, that is, moves to the outside of the cutter 6, the stopping member 5 moves to the second state shown in fig. 15, the torsion spring 81 is compressed to generate elastic deformation, and the first stopping portion 51 is separated from the path of the movement of the second stopping portion 621 in the distal direction.

When the closing of the nail head is completed and the stop piece 5 enters the second state, the operation handle is held again, the pushing cutter bar 7 and the cutter 6 are driven by the transmission mechanism to move continuously in the distal direction, the cutter 6 moves to the position 6c to be abutted against the proximal side of the driving piece 4 at first, the driving piece 4 at the position 4b is driven to move in the distal direction to the position 4c, staples are pushed out of the suture tissue, and meanwhile, the cutter 6 cuts the tissue, so that the normal firing of the anastomat is realized. During the firing process of the anastomat, the driving member 4 moves in the distal direction, so that the first driving portion 41 is separated from the second driving portion 55, the first stopping portion 51 of the stopping member 5 is abutted against the side wall of the connecting portion 62 of the cutting knife 6 to be kept in the second state, and after the cutting knife 6 is completely moved to the distal side of the stopping member 5, as shown in fig. 16, the first stopping portion 51 of the stopping member 5 is abutted against the side surface of the push rod 7 to keep the stopping member 5 in the second state, and the torsion spring 81 is kept in the state with elastic deformation.

After the firing of the stapler is completed, under the holding action of the push rod 7, the stop member 5 is still in the second state, and at this time, the cutter 6 and the push rod 7 are driven to reset in the proximal direction by the reset mechanism, while the driving member 4 is still left at the position 4c and is not reset to the proximal side of the cartridge assembly 1. In the process of resetting the cutter 6 from the distal end to the proximal end, the first stop part 51 of the stop member 5 still abuts against the side wall of the push rod 7, and when the cutter 6 moves to the position of the stop member 5, the first stop part 51 abuts against the side wall of the connecting part 62 of the cutter 6 until the cutter 6 is completely reset to the proximal end side of the first stop part 51. At this time, the first stopper 51 is not abutted against the cutter 6 and the push rod 7 any more, and there is no abutment driving force of the driving member 4, the stopper 5 rotates in the second direction by the elastic deformation restoring force of the torsion spring 81, the first stopper 51 moves toward the axial direction of the stapler, that is, moves inward, and the first stopper 51 enters the path along which the second stopper 621 moves toward the distal end side again, and the stopper 5 enters the first state. At this time, if the handle is held, the cutter 6 moves to the distal direction to a position where the nail head is closed, since the driving member 4 is not provided at the proximal side of the cartridge assembly 1, the stopper 5 is still in the first state, and if the handle is held, the cutter 6 is driven to the distal direction, as shown in fig. 17, the second stopper 621 of the cutter 6 is blocked by the first stopper 51 of the stopper 5, so that the cutter 6 cannot move to the distal direction continuously, and the stapler cannot be fired, thereby effectively avoiding the secondary false firing when the cartridge 11 is not replaced.

Fig. 18 to 20 show the structure in which the stopper 5 and the connector 3 of the second embodiment of the present application are engaged. This embodiment differs from the first embodiment in that the structure of the coupling member 3 mated with the stopper 5 is different, and in that the structure of the elastic member mated with the stopper 5 is different. In this embodiment, the elastic member is a compression spring 82, and the inside of the installation groove 31 is provided with a compression spring channel 35 for accommodating the compression spring 82. The compression spring 82 is movably arranged in the compression spring channel 35, the compression spring channel 35 is perpendicular to the side wall of the cutter 6, and the axial width of the compression spring channel 35 is greater than that of the mounting groove 31, so that the compression spring 82 cannot fall out from the lower part of the mounting groove 31. Both ends of the compression spring 82 respectively abut against the bottom wall of the compression spring channel 35 and the outer side surface of the stop member 5. The second limiting portion 52 is a protruding portion located above the pivoting portion 54 and protruding toward the inner side with respect to the pivoting portion 54, the first limiting portion 32 is a step portion located on the bottom wall of the mounting groove 31 and having a shape corresponding to the second limiting portion 52, the rotation angle of the stopper 5 in the second direction is limited, and the upper surface of the step portion is substantially perpendicular to the longitudinal direction and intersects with the extending direction of the third limiting portion 33. The second limiting portion 52 may further enhance the overall structural strength of the stopper 5. The third limiting portion 33 is an inner wall located below the compression spring channel 35, and the fourth limiting portion 53 is a side wall of the mounting groove 31 located below the pivot portion 54 and outside the stop member 5. When the stopper 5 is rotated in the first direction by the external force to enter the second state, the stopper 5 compresses the compression spring 82 to elastically deform, and the third limiting portion 33 and the fourth limiting portion 53 cooperate to limit the rotation angle in the first direction. After the external force applied to the stopper 5 is removed, the stopper 5 rotates in the second direction under the elastic deformation restoring force of the compression spring 82 to enter the first state. Other structures in the second embodiment are the same as corresponding structures in the first embodiment, and are not described here again. The structure of the second embodiment may also be combined with the first embodiment, for example, the torsion spring 81 provided in the mounting groove 31 in the first embodiment is directly replaced with the compression spring 82 while the structure of the stopper 5 is maintained, or the mating structure of the mounting groove 31 and the stopper 5 in the first embodiment is replaced with the structure of the second embodiment while the retaining elastic member is the torsion spring 81. In this embodiment, the torsion spring 81 of the first embodiment is replaced by the compression spring 82, the gap between the stopper 5 and the connecting piece 3 is reduced, and the connection strength is increased, so that the stopper 5 is prevented from deflecting during use.

In the above embodiment, the first jaw is a cartridge assembly, the second jaw is an anvil assembly, the anvil assembly is fixed relative to the connecting member, the cartridge assembly is rotatable relative to the connecting member, and the driving member is disposed on the cartridge assembly. In other alternative embodiments, the first jaw may be an anvil assembly and the second jaw may be a cartridge assembly, the driver may be disposed on the anvil assembly and the cartridge assembly may be fixed relative to the connector and the anvil assembly may be rotatable relative to the connector. The driving piece in the nail anvil assembly is far away from the stop piece and does not abut against the second driving part before the nail head is closed, and the driving piece can abut against the second driving part to drive the stop piece to enter the second state after the nail head is closed and the driving piece is positioned on the proximal end side of the nail anvil assembly.

In the above embodiments, the first stopper portion and the second driving portion are integrally provided as an example. In other alternative embodiments, the first stop and the second drive may also be two parts, for example two cams on the inner side of the stop, the second drive being located below the first stop. When the nail cartridge assembly rotates to gradually close the jaws, the first driving part is abutted with the second driving part to drive the stop piece to rotate along the first direction.

Two embodiments of the elastic element are exemplarily given in the above examples: torsion springs and compression springs. In other alternative embodiments, the elastic member may take other configurations. For example, the compression spring in the second embodiment is replaced by a spring piece, an elastic pad, or the like, or the elastic piece may be a tension spring connected between the inner side of the stop piece and a position of the cartridge frame close to the second feed groove, and in the first state, the biasing force of the tension spring to the stop piece is a pulling force pulling the first stop portion inwards.

The foregoing is a further detailed description of the present application in connection with the specific preferred embodiments, and it is not intended that the practice of the present application be limited to such description. It should be understood that those skilled in the art to which the present application pertains may make several simple deductions or substitutions without departing from the spirit of the present application, and all such deductions or substitutions should be considered to be within the scope of the present application.

Claims (16)

1. A head for a surgical stapler, the head comprising:

a first jaw and a second jaw disposed opposite each other;

a connector connected to proximal sides of the first jaw and the second jaw;

a stopper rotatably mounted to the connection member and including a first stopper portion;

the firing mechanism can move along the axial direction of the anastomat and comprises a second stop part;

when the stop piece is in a first state, the first stop part is positioned on a path along which the second stop part moves towards the distal end side; when the first stop part moves away from the axis of the anastomat, the stop part enters a second state, and the first stop part is separated from a path of the second stop part moving towards the far end side.

2. The stapling head according to claim 1, wherein a distal end of the connecting member is provided with a mounting portion for mounting the stopper, and the mounting portion is at least partially provided on a side of the second stopper away from an axial center of the stapler when the first jaw and the second jaw are in an open state; the first stop portion and the second stop portion are provided with a first distance in the axial direction.

3. The stapling head according to claim 2, wherein the stopper further comprises a pivot portion rotatably mounted to the mounting portion via a pin, the first stopper portion protruding toward an axial direction of the stapler with respect to the pivot portion when the stopper is in the first state.

4. The stapling head of claim 2, further comprising a drive member disposed on said first jaw and movable in an axial direction of said stapler, said first jaw being rotatable relative to said connecting member;

the drive member is located at a proximal side of the first jaw and when the first jaw rotates to be relatively closed with the second jaw, the drive member abuts the stop member and drives the stop member from the first state into the second state.

5. The stapling head of claim 4, wherein said firing mechanism moves a second distance in a distal direction when said stop moves from said first state to said second state, said first distance being greater than or equal to said second distance.

6. The stapling head according to claim 4, wherein a first driving portion is provided on a proximal end side of the driving member, and a second driving portion which is engaged with the first driving portion is provided on a side of the stopper facing the shaft center of the stapler.

7. The stapling head according to claim 6, wherein opposite sides of the first and second driving portions are provided with a first and a second guiding surface, respectively.

8. The stapling head according to claim 7, wherein the first stop portion and the second drive portion are integrally provided, and a side of the first stop portion facing the first jaw is the second guide surface when the stop member is in the first state.

9. The stapling head of claim 1, wherein the firing mechanism comprises a cutter and a pusher bar, the distal end of the cutter being provided with the second stop, the proximal end of the cutter being coupled to the pusher bar.

10. The stapling head of claim 9, wherein said stop is in said second state and said stop is at least partially held against a side of said pusher bar in said second state upon movement of said firing mechanism in a distal direction.

11. A stapling head according to claim 3, further comprising a resilient member configured to apply a biasing force to the stop member that causes it to rotate in a second direction, the second direction being opposite the first direction.

12. The stapling head according to claim 11, wherein the mounting portion is provided with a mounting groove opening in an axial direction of the stapler, and the stopper is at least partially entered into an inside of the mounting groove.

13. The stapling head according to claim 12, wherein the elastic member is a torsion spring provided at the pin shaft or a compression spring provided between the stopper and an inner wall of the mounting groove.

14. The tack head of claim 12, wherein the connector includes a first limit feature, the mounting slot has a second limit feature, the first limit feature and the second limit feature cooperate to limit the rotational angle of the connector in a second direction; and/or the number of the groups of groups,

the connecting piece further comprises a third limiting part, the stop piece comprises a fourth limiting part, and the third limiting part and the fourth limiting part are matched to limit the rotation angle of the connecting piece along the first direction.

15. The stapling head according to claim 13, wherein a compression spring channel is provided in the mounting groove, the compression spring is movably provided in the compression spring channel, the compression spring channel is perpendicular to a side wall of the firing mechanism, and an axial width of the compression spring channel is greater than an axial width of the mounting groove.

16. A surgical stapler comprising the stapling head of any one of claims 1 to 15.

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