CN117442278A - Closing driving mechanism and medical anastomat - Google Patents

Abstract

The invention provides a closing driving mechanism and a medical anastomat, wherein the closing driving mechanism comprises: an actuating lever provided with a closing drive portion and a first stopper portion; a lock member including a second stopper portion located on a proximal end side of the first stopper portion when the actuation lever is in the first position region; a closure tab assembly at least partially located on a proximal side of the closure drive portion; when the actuating rod moves from the first position area to the second position area in the proximal direction, the closing driving part drives the closing pull piece assembly to move in the proximal direction, and the first stopping part moves to be aligned with the second stopping part in the longitudinal direction so as to enable the first stopping part and the second stopping part to be embedded. The invention can drive the closing pull piece assembly to move towards the proximal side by the actuating rod to close the nail head to the required degree, and the nail head is kept stable in the current state by the locking piece.

Description

Closing driving mechanism and medical anastomat

Technical Field

The invention relates to the technical field of medical instruments, in particular to a closing driving mechanism and a medical anastomat.

Background

The medical anastomat comprises a medical anastomat body, a firing handle movably connected with the medical anastomat body and a nail head matched with the medical anastomat body. The nail head comprises a nail bin assembly and a nail anvil which are oppositely arranged. During operation, the trigger handle is held firstly, the closing pulling piece is pulled to move towards the proximal end side of the anastomat through the closing driving mechanism, so that after the nail bin assembly and the nail anvil are closed, the trigger handle is held again, the anastomat can be pushed to move towards tissues, the tissues are anastomosed through the forming of the anastomat in the nail bin assembly at the nail anvil, and meanwhile, the cutter moves towards the distal end side to cut the tissues. In the present invention, the distal end side and the proximal end side are the proximal end side with respect to the operator, and the end closer to the operator, that is, the end closer to the surgical site is the distal end side.

In practical applications, it is sometimes necessary to partially close the head, and to properly reduce the diameter of the head so that it can smoothly enter the surgical channel, and then open the head to continue the subsequent full closure and firing operations. The prior art closure drive mechanism can only switch the staple head of the stapler between the fully open and fully closed states, but cannot maintain the staple head in a partially closed state between the open and closed states.

Disclosure of Invention

In view of the problems in the prior art, an object of the present invention is to provide a closing driving mechanism and a medical stapler, wherein an actuating rod can drive a closing pull-tab assembly to move in a proximal direction to close a nail head to a required extent, and a locking piece keeps the nail head stable in a current state.

The embodiment of the invention provides a closing driving mechanism for a medical anastomat, which comprises the following components:

an actuating lever provided with a closing drive portion and a first stopper portion;

a lock member including a second stopper portion located on a proximal end side of the first stopper portion when the actuation lever is in the first position region;

A closure tab assembly at least partially located on a proximal side of the closure drive portion;

when the actuating rod moves from the first position area to the second position area in the proximal direction, the closing driving part drives the closing tab assembly to move in the proximal direction, the first stopping part moves to be aligned with the second stopping part in the longitudinal direction, and the second stopping part is embedded with the first stopping part to stop the actuating rod from moving in the distal direction.

In some embodiments, the actuator rod is at least partially located inside the housing, the locking member is movably connected to the housing, and the locking member has axial movement and rotational movement relative to the housing;

when the actuating rod is positioned in the first position area, the second stop part is abutted against the surface of the actuating rod, on which the first stop part is arranged, of the side surface;

when the actuating rod moves from the first position area to the second position area in the proximal direction, the locking piece rotates to enable the second stopping part to move to be embedded with the first stopping part in the direction of approaching the actuating rod.

In some embodiments, the locking member includes a body portion and a pivot portion secured to a proximal end of the body portion, the second stop portion is secured to a distal end of the body portion, the housing is provided with a first slot portion, and the pivot portion at least partially enters the first slot portion and is axially and rotationally movable relative to the first slot portion such that the second stop portion is movable in a direction toward and away from the actuator lever.

In some embodiments, the pivot is axially movable in a first direction and a second direction, the first and second directions being opposite one another; and can perform rotational movement in a third direction and a fourth direction, the third direction and the fourth direction being opposite to each other;

when the pivot portion rotates in the third direction, the second stop portion is engaged with the first stop portion.

In some embodiments, the locking member further comprises a guide portion provided on the body portion, the second stop portion is provided on a side of the guide portion facing the actuating lever, the housing is provided with a second groove portion, the second groove portion is located at a distal end of the first groove portion, and the guide portion is movably provided in the second groove portion;

the guide portion is movable in a direction approaching the actuating lever and a direction separating from the actuating lever, and is axially movable in the first direction and the second direction.

In some embodiments, the second stop is configured to be biased toward the actuator rod by a first spring.

In some embodiments, the first elastic member is disposed on a side of the body portion away from the actuating lever, and the first elastic member is fixedly connected with the locking member.

In some embodiments, the first groove portion is an axially extending groove, the second groove portion has a protrusion disposed therein, the second groove portion is a communication channel surrounding the protrusion, the communication channel includes a first channel extending from a1 position to a2 position, a second channel extending from a2 position to a3 position, and a third channel extending from a3 position to a1 position;

the a1 position is located on the distal side of the bump with a first distance between the a1 position and the actuation rod, the a2 position is located on the distal side of the bump with a second distance between the a2 position and the actuation rod, the a3 position is located on the proximal side of the bump with a third distance between the a3 position and the actuation rod, and the a2 position is located with a fourth distance between the a3 position;

the first distance is greater than the second distance, and the second distance is greater than or equal to the third distance.

In some embodiments, the bump includes a first surface, a second surface, and a third surface that are parallel to the first channel, the second channel, and the third channel, respectively.

In some embodiments, the guide portion moves from the a1 position to the a2 position when the actuating lever moves from the first position region to the second position region in the proximal direction, so that the second stopper portion is engaged with the first stopper portion.

In some embodiments, when the actuation lever moves proximally from the second position region to a third position region, the guide moves from the a2 position to the a3 position, the pivot moves in the first direction, and then the guide returns from the a2 position to the a1 position, the pivot moves in the second direction, disengaging the second stop from the first stop.

In some embodiments, the first groove portion has a fifth distance in the axial direction, the fifth distance being greater than the fourth distance.

In some embodiments, a second resilient member is included that provides a biasing force to the second stop portion toward the distal side and in a direction away from the actuation rod.

In some embodiments, the first elastic element is disposed on a side of the body portion away from the actuating lever, and the housing is further provided with a yielding groove, and when the guide portion moves to the a3 position, the first elastic element at least partially enters the yielding groove.

In some embodiments, the first stop portion is a slot, and the second stop portion at least partially enters the first stop portion when the second stop portion is engaged with the first stop portion.

In some embodiments, the distal side of the second stop includes a perpendicular stop surface.

In some embodiments, the proximal side of the second stop includes an angled guide surface that forms an acute included angle with the stop surface.

In some embodiments, the closure driving portion is a boss disposed at one side of the actuating lever.

In some embodiments, the closure tab assembly includes a closure tab, a closure pull rod, a proximal side of the closure tab being secured to the closure pull rod, and a closure return spring that imparts a distally directed biasing force to the closure pull rod.

The embodiment of the invention also provides a medical anastomat, which comprises the closing driving mechanism.

The closing driving mechanism and the medical anastomat provided by the invention have the following advantages:

according to the invention, the closing pull piece assembly can be driven to move towards the proximal side by the actuating rod to close the nail head to a required degree, and the nail head is kept stable in the current state by the locking piece, so that the partial closing state of the nail head can be realized, and the closing drive mechanism is suitable for application requirements of different scenes and is simple in structure and convenient to use.

Drawings

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

FIG. 1 is a schematic view of a medical stapler according to an embodiment of the present invention;

FIG. 2 is a schematic view of a stapler of an embodiment of the invention with the staple head and one side housing omitted, wherein the locking member is in a first state and the rack is in a first location area;

FIG. 3 is an enlarged view at A in FIG. 2;

FIG. 4 is a schematic view of a side housing according to an embodiment of the present invention;

FIG. 5 is an enlarged view at B in FIG. 4;

FIGS. 6 and 7 are schematic views of the structure of a second pin slot according to an embodiment of the present invention;

FIG. 8 is a schematic view of a closure drive mechanism according to an embodiment of the present invention, wherein the linkage assembly is in a third state;

FIG. 9 is a schematic illustration of the engagement of a rack with a closure tie assembly and a locking member in accordance with an embodiment of the present invention;

FIG. 10 is a schematic view of a locking element according to an embodiment of the present invention;

FIG. 11 is a schematic view of a portion of a stapler according to an embodiment of the invention, wherein the locking member is in a second state and the rack is located in a second position area;

FIG. 12 is a schematic view of the engagement of a rack and a latch according to an embodiment of the present invention, wherein the latch is in a second state and the rack is in a second location area;

FIG. 13 is an enlarged view of FIG. 12 at C;

FIG. 14 is a schematic view of the structure of the pin slot on the housing according to one embodiment of the present invention;

FIG. 15 is a schematic view of a locking element according to an embodiment of the present invention;

FIG. 16 is a schematic view of a portion of a stapler according to an embodiment of the invention, wherein the locking member is in the second state and the rack is in the third position area;

FIG. 17 is a schematic view of the structure of the pin slot on the housing according to an embodiment of the present invention;

FIG. 18 is a schematic view of a closure drive mechanism according to an embodiment of the present invention, wherein the linkage assembly is in a fourth state;

FIG. 19 is a schematic view showing a partial structure of a stapler according to an embodiment of the invention, wherein the locking member is in the first state and the rack is located in the third position area;

fig. 20 is a schematic view showing the structure of the pin slot on the housing according to an embodiment of the present invention.

Reference numerals:

1. first pivoting portion of stapler body 412

11. Second pivot part of fixed handle 413

13. Second rod of the housing 42

15. Third pivot portion of the yielding groove 421

16. Fourth pivot portion of the first slot portion 422

17. The second groove 51 closes the pull rod

171. The first passage 52 closes the return spring

172. Second channel 53 closure tab

173. Third channel 6 rollback pull rod

174. Bump 7 locking piece

1741. First surface 71 pivot

1742. Second surface 711 adaptation groove

1743. Third surface 72 guide

175. Second stop of axial extension 73

18. Stop surface of connecting rod 731

19. Guide surface of handle return spring 732

2. Fitting portion of rack 74 elastic member

21. Drive tooth 75 body portion

22. First elastic piece of stop groove 81

23. Second elastic member of the closing driving part 82

3. Nail head of firing handle 9

31. Claw 91 nail anvil

32. First mating groove of driving rod 911

4. Link assembly 92 cartridge assembly

41. First rod 921 second mating groove

411. Drive 93 closure pin

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 exemplary features and elements of the invention, 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 in order to fall within the scope of the invention. Although the terms "first" or "second" etc. may be used herein to describe certain features, these terms are merely intended to describe the same as used herein.

The invention provides a closing driving mechanism for a medical anastomat and the medical anastomat comprising the same. The closure driving mechanism includes: an actuating lever provided with a closing drive portion and a first stopper portion; the locking piece comprises a second stop part; a closure tab assembly is at least partially located on a proximal side of the closure actuation portion. The second stop is located on a proximal side of the first stop when the actuation rod is in the first position region, and the lock does not block axial movement of the actuation rod. When the actuating rod moves from the first position area to the second position area in the proximal side direction, the closing driving part drives the closing pulling-on piece assembly to move in the proximal side direction and drives the nail head of the anastomat to be closed to a certain extent, so that the partial closing state is achieved, at the moment, the first stop part moves to be aligned with the second stop part in the longitudinal direction, the second stop part is embedded with the first stop part, and the nail head can be kept in the partial closing state, so that the requirements of different scenes are met. In the present invention, the movement of the first stopper portion into longitudinal alignment with the second stopper portion means that a first projection of the first stopper portion on a plane perpendicular to the longitudinal direction at least partially coincides with a second projection of the second stopper portion on a plane perpendicular to the longitudinal direction.

The following describes the structure of the closure driving mechanism of various embodiments of the present invention in detail with reference to the accompanying drawings, and it is to be understood that the various embodiments are not limiting of the scope of the present invention.

As shown in fig. 1 and 2, the medical stapler comprises a staple head 9, a stapler body 1 and a firing handle 3 rotatably connected to the stapler body 1. The stapler body 1 comprises a connecting rod 18 and a fixed handle 11. The closing drive mechanism is at least partially arranged in the stapler body 1. The nail head 9 is arranged on the distal end side of the connecting rod 18 of the anastomat body 1. As shown in fig. 1, the head 9 includes an oppositely disposed anvil 91 and a cartridge assembly 92, the anvil 91 having an open condition relative to the cartridge assembly 92 and a closed condition relative to the cartridge assembly 92. The proximal side of the anvil 91 is provided with an inclined first mating groove 911, the proximal side of the cartridge assembly 92 is provided with an axially extending second mating groove 921, and a closure pin 93 is simultaneously threaded into the first mating groove 911 and the second mating groove 921. The closing drive mechanism comprises a housing 13 of the stapler body 1 and a closing tab 53 (shown in fig. 8) for closing the head 9, the closing tab 53 being arranged through the interior of the connecting rod 18. The distal side of the closure tab 53 is connected to the closure pin 93. In the initial state, the closing pin 93 is located at the distal end side of the second fitting groove 921, and the anvil 91 is in the open state. The closing tab 53 pulls the closing pin 93 from the distal side to the proximal side of the second mating slot 921, and the anvil 91 enters the closed state, at which time the anvil 91 and the cartridge assembly 92 clamp tissue. The process of bringing the anvil 91 from the open state into the closed state is called the closing process of the head 9, i.e. the closing process of the stapler. During firing of the stapler, it is necessary to keep the head 9 closed. After the stapler has been fired, the closing pin 93 and the closing tab 53 can be moved in distal direction to open the head 9.

In the present invention, the distal end side and the proximal end side are the proximal end side with respect to the operator, the end closer to the operator, the end farther from the operator, i.e., the end closer to the operation position, are the distal end sides, and the direction along the axis of the stapler is the axial direction, i.e., the direction from the distal end side to the proximal end side of the stapler, or the direction from the proximal end side to the distal end side of the stapler. For example, in the view of fig. 1, the distal side is the left side and the proximal side is the right side for the stapler. The direction S1 in fig. 1 is the direction from the distal end side to the proximal end side of the stapler. The direction S1 or the direction opposite to the direction S1 is defined as the axial direction of the anastomat. The S2 direction in fig. 2 is defined as the longitudinal direction, i.e., the height direction.

As shown in fig. 1-6, the closure driving mechanism further comprises an actuating lever, a closure tab assembly and a latch 7. In this embodiment, the actuating rod is a rack 2, a driving tooth 21 is arranged on one side of the rack 2 facing the firing handle 3, when the anastomat is fired, the firing handle 3 is held, and the rack 2 can be driven to move towards the distal side by matching the claw 31 on the firing handle 3 with the driving tooth 21, so that the distal push rod is driven to fire the anastomat. The anastomat also comprises a rollback pull rod 6, the rollback pull rod 6 is fixedly connected with the rack 2, and the axial movement of the rollback pull rod 6 can drive the axial movement of the rack 2. The rack 2 is provided with a closing drive portion 23 and a first stop portion, the closing drive portion 23 is a protruding portion provided on one side of the rack 2, and the first stop portion is a stop groove 22 provided on one side of the rack 2 facing the lock 7. The locking piece 7 is located at one side of the rack 2 and is movably connected to the housing 13, and the locking piece can move axially and rotationally relative to the housing 13. The locking element 7 comprises a second stop 73. The closing tab assembly comprises a closing tab 53, a closing pull rod 51 and a closing return spring 52, wherein the closing pull rod 51 is sleeved outside the connecting rod 18 and is at least partially positioned at the proximal end side of the closing driving part 23. The proximal end side of the closing tab 53 is fixed to the closing lever 51. The closing return spring 52 applies a biasing force to the closing rod 51 toward the distal end side, and the closing return spring 52 may be selected to be a compression spring, but the present invention is not limited thereto, and in other embodiments, the closing return spring 52 may be a tension spring or other type of elastic member.

As shown in fig. 2 and 3, in the initial state, when the rack 2 is in the first position area, the second stop portion 73 is located at the proximal end side of the stop groove 22, the locking member 7 does not block the axial movement of the rack 2, at this time, the closing tie rod 51 is in its initial position, and the head is in the fully opened state. As shown in fig. 11, when the rack 2 moves from the first position area to the second position area in the proximal direction, the closing driving part 23 drives the closing pull rod 51 to move in the proximal direction, and the closing pull rod 51 drives the closing pull piece 53 to move in the proximal direction to drive the nail head of the stapler to close to a certain extent, so as to achieve a partially closed state. In the state shown in fig. 11, the first stopper portion moves to be aligned with the second stopper portion 73 in the longitudinal direction, the locking member 7 rotates to move the second stopper portion 73 in the direction approaching the rack 2 until the second stopper portion 73 at least partially enters the stopper groove 22 to engage with the stopper groove 22, thereby maintaining the current position of the rack 2 unchanged, that is, maintaining the current positions of the closing tie bar 51 and the closing tab 53 unchanged, and maintaining the head in a partially closed state. Alignment here means that the first projection of the stop groove 22 on a plane perpendicular to the longitudinal direction and the second projection of the first stop on a plane perpendicular to the longitudinal direction at least partially coincide.

As shown in fig. 2 to 4, in this embodiment, the rack 2 is at least partially located inside the housing 13, the locking member 7 further includes a body portion 75, a pivot portion 71 and a guide portion 72, the pivot portion 71 is fixed to a proximal end of the body portion, the guide portion 72 is fixed to a distal end of the body portion 75, and the second locking portion 73 is disposed on a side of the guide portion 72 facing the rack 2. The locking element 7 may be integrally formed as one piece or one or more of the elements may be separately formed and secured together. The housing 13 is provided with a first slot portion 16 and a second slot portion 17, the pivot portion 71 at least partially enters the first slot portion 16 and is axially and rotationally movable relative to the first slot portion 16, and the guide portion 72 is provided in the second slot portion 17.

The pivot portion 71 is axially movable in a first direction from the distal end side toward the proximal end side and a second direction from the proximal end side toward the distal end side. The pivot is rotatably movable in a third direction, which is counterclockwise in fig. 11, and a fourth direction, which is clockwise in the drawing. When the pivot portion 71 rotates in the third direction relative to the housing 13, the guide portion 72 may drive the second stop portion 73 to move in a direction approaching the rack 2, and when the pivot portion 71 rotates in the fourth direction, the second stop portion 73 moves in a direction separating from the rack 2. Thus, the locking member 7 has a first state and a second state, the first state being a state in which the body portion 75 extends in the axial direction as shown in fig. 3, and at this time, the second stopper portion 73 is separated from the stopper groove 22. The second state is a state in which the body portion 75 is inclined with respect to the axial direction, as shown in fig. 11, and the second stopper 73 moves toward the rack 2 to enter at least partially into the stopper groove 22. At the same time, the guide portion 72 is axially movable in the first direction and the second direction.

As shown in fig. 3, 9 and 10, the closing drive mechanism further includes a first elastic member 81, and the first elastic member 81 applies a biasing force to the second stopper 73 in a direction toward the rack gear 2. In this embodiment, the first elastic member 81 is located on a side of the body 75 away from the rack 2, and the first elastic member 81 and the locking member 7 are fixedly connected. In this embodiment, the first elastic member 91 is a spring plate, and the first elastic member 81 and the locking member 7 are integrally formed. However, the present invention is not limited thereto, and in other embodiments, the first elastic member 81 may be a single elastic piece, one end of which is fixed to the upper surface of the main body 75, and in other embodiments, the first elastic member 81 may be another elastic member such as a compression spring, a tension spring, or a torsion spring. The closure driving mechanism further comprises a second elastic member 82, wherein the second elastic member 82 gives the second stopper 73 a biasing force toward the distal end side and in a direction away from the rack 2, i.e., in the view of fig. 3, the second elastic member 82 gives the second stopper 73 a biasing force toward the upper left. In this embodiment, the second elastic member 82 is a tension spring, one end of the second elastic member 82 is fixed to the housing 13, and the other end of the second elastic member 82 is fixed to the elastic member engaging portion 74 on the locking member 7. However, the present invention is not limited thereto, and in other embodiments, the second elastic member 82 may be another elastic member such as a compression spring, a tension spring, or a spring plate.

As shown in fig. 5, the first groove portion 16 is a groove extending in the axial direction, so that the pivot portion 71 does not move longitudinally in the first groove portion 16, only in the rotational movement and the axial movement. As shown in fig. 6, a bump 174 is disposed in the second groove 17, and the second groove 17 is a communication channel surrounding the bump 174, and the communication channel includes a first channel 171, a second channel 172, and a third channel 173, wherein the first channel 171 extends from a1 position to a2 position, the second channel 172 extends from a2 position to a3 position, and the third channel 173 extends from a3 position to a1 position. Wherein the a1 position is located on the distal end side of the bump 174 with a larger first distance between the a1 position and the rack 2, i.e., the a1 position is located on the upper left of the bump 174; the a2 position is located on the distal end side of the bump 174 with a smaller second distance from the rack 2, i.e., the a2 position is located below the bump 174 to the left, the first distance being greater than the second distance. The a3 position is located on the proximal end side of the bump 174 with a third distance between the a3 position and the rack 2, i.e., the a3 position is located right below the bump 174. The second distance is equal to or greater than the third distance, i.e., the a2 position is axially aligned with the a3 position, or the a3 position is offset upward compared to the a2 position. A fourth distance is provided between the a2 position and the a3 position, and the second groove portion 17 has a fifth distance in the axial direction, and the fifth distance is greater than the fourth distance. The guide part 72 can move in the direction indicated by the arrow in the second groove part 17, the movement path is similar to a triangle, and the second stop part 73 moves along with the guide part 72 along the movement path similar to the triangle. Further, the second groove 17 further includes an axial extension 175 located at a proximal end side of the third channel 173, and provides a certain buffer space for the guide 72 when the guide 72 moves from the a3 position to the a1 position, so that the guide 72 is not caught at the a3 position. As shown in fig. 7, in this embodiment, the tab 174 includes first, second and third surfaces 1741, 1742, 1743 parallel to the first, second and third channels 171, 172, 173, respectively, to better guide the movement of the guide 72.

The operation of the closure driving mechanism in the different states will be described in more detail below with reference to fig. 2 to 14.

As shown in fig. 2 to 9, in the initial state, the rack 2 is located in the first position region, the second stopper 73 is located on the proximal end side of the stopper groove 22, the stopper 7 is in the second state, and the second stopper 73 abuts against a surface of the rack 2 facing the stopper 7. The second yielding portion is in a stable state under the biasing force of the second elastic member 82 and the abutting force of the surface of the rack 2, the guide portion 72 is kept at the position a1 above the left of the projection 174, and the pivot portion 71 is located at the distal end side of the first groove portion 16. As shown in fig. 10, the distal side of the second relief includes a vertical stop surface 731. As shown in fig. 9, the distal side of the detent groove 22 may also be a vertical stop surface.

As shown in fig. 11 to 14, when the rack 2 is driven to move in the proximal direction by the retraction lever 6, the rack 2 moves from the first position region to the second position region in the proximal direction. The closing driving part 23 of the rack 2 drives the closing pull rod 51 to move towards the proximal direction and drives the closing pull piece 53 to move towards the proximal direction to partially close the head part, namely, the head part is partially closed, and at the moment, the closing return spring 52 is compressed to generate a first deformation amount. In the present invention, the partially closed state refers to a state between the fully opened and fully closed state, and not particularly to a state of an intermediate point, and the closing drive mechanism can define the degree of closure of the head of the nail in the partially closed state by designing the locking position of the locking groove 22 of the rack 2 and the locking piece 7.

After the movement of the rack 2 into the second position region, the detent groove 22 moves below the first detent, i.e. the detent groove 22 is aligned in the longitudinal direction with the first detent. When the abutting force of the surface of the rack 2 is lost, the biasing force of the second elastic member 82 is insufficient to overcome the downward biasing force of the first elastic member 81, the guide portion 72 moves toward the rack 2 along the first channel 171 of the second groove portion 17, that is, from the a1 position to the a2 position, under the action of the first elastic member 81, the second stopper portion 73 rotates about the pivot portion 71 in the third direction, so that the second stopper portion 73 at least partially enters the stopper groove 22, the body portion 75 is inclined with respect to the axial direction, and the stopper lock 7 enters the second state. The rack 2 is locked in the current second position area, so that the positions of the closing pull rod 51 and the closing pull piece 53 are kept still, and the nail head is kept in a partially closed state. Thus, by driving the rack 2 to move from the first position region to the second position region in the proximal-end-side direction, switching of the head portion from the closed state to the partially closed state is achieved, and the head portion can be held in the partially closed state.

As shown in fig. 15, in this embodiment, the proximal side of the second stopper 73 includes an inclined guide surface 732, and the guide surface 732 forms an acute angle with the stopper surface 731. In a state where the nail head is partially closed, if the rack 2 is driven to move from the second position area to the first position area for resetting, the proximal side wall of the stopper groove 22 gives an upward component force to the guide surface 732 by the guide surface 732, the second stopper 73 can move upward to be separated from the stopper groove 22 against the downward biasing force of the first elastic member 81, without blocking the movement of the rack 2 in the distal direction. The proximal side surface of the stopper groove 22 may be provided as a guide surface 732, and the second stopper 73 may be disengaged from the stopper groove 22 when the rack 2 moves in the distal direction in the same direction as the inclination direction of the guide surface 732 of the second stopper 73. The pivoting part 71 includes an adaptation groove 711 adapted to the shape of the upper surface of the rack 2, and may define that the pivoting part 71 does not move laterally with respect to the rack 2, but only moves axially and rotates.

As shown in fig. 16 and 17, when the rack 2 continues to move from the second position area to the third position area in the proximal direction, the rack 2 continues to drive the closing rod 51 to move in the proximal direction, and the closing tab 53 drives the nail head to further close. With the engagement of the stop surface 731 of the second stop portion 73 and the distal side surface of the stop groove 22, the rack 2 drives the second stop portion 73 to move in the proximal direction, driving the pivot portion 71 to move in the first direction from the distal side to the proximal side of the first groove portion 16, and the guide portion 72 moves from the a2 position to the a3 position. When the guide 72 is moved between the a2 position and the a3 position, the second stop 73 remains engaged with the stop slot 22 to keep the staple head closed to different degrees as the rack 2 is moved proximally to different positions due to the longitudinal restriction of the guide 72 by the second surface 1742 of the tab. The housing 13 is further provided with a relief groove 15 between the first groove portion 16 and the second groove portion 17. When the guide portion 72 moves to the a3 position, the first elastic member 81 at least partially enters the relief groove 15, so that the downward biasing force of the first elastic member 81 to the second stopper 73 is reduced. At this time, the upward force of the second elastic member 82 to the second stopper 73 is greater than the downward force of the first elastic member 81 to the second stopper 73. Under the biasing force of the second elastic member 82 to the upper left, the guide portion 72 returns from the a3 position to the a1 position again, so that the second stopper 73 is disengaged from the first stopper, the pivot portion 71 rotates in the fourth direction, and moves from the proximal end side to the distal end side of the first groove portion 16 in the second direction, so that the closing drive mechanism reaches the state shown in fig. 18 to 20. As shown in fig. 18 to 20, the stopper groove 22 moves to the proximal end side of the second stopper 73, and the second stopper 73 abuts against the surface of the rack 2 on the distal end side of the stopper groove 22. When the rack 2 moves to the distal direction and the stop groove 22 is aligned with the second stop portion 73 again in the longitudinal direction during the firing of the stapler, the second stop portion 73 may fall into the stop groove 22 under the action of the guide surface 732 of the second stop portion 73, but may quickly separate from the stop groove 22 again and be located at the proximal side of the stop groove 22, so that the movement of the rack 2 to the distal direction is not blocked, and the normal firing of the stapler is not hindered.

The closure driving mechanism of the present invention can achieve a switchover of the stapling head from a fully open state to a partially closed state. The closure driving mechanism can also be matched with other closure switching mechanisms to drive the axial movement of the closure pulling piece 53 by the other closure switching mechanisms so as to realize the switching of the nail head between the fully opened state and the fully closed state. And the switching of the stapling head between the fully open state and the partially closed state is achieved by the closure driving mechanism of the present invention. The switching of the staple head from the fully open state to the partially closed state will be described below by taking the form of a link assembly as an example of the closure switching mechanism. However, the present invention is not limited thereto, and the closing drive mechanism may be engaged with other closing switching mechanisms as long as the head of the staple can be driven from the fully opened state to the fully closed state.

As shown in fig. 8, in this embodiment, the link assembly 4 includes a first lever 41 and a second lever 42, the first lever 41 includes a driving portion 411, a first pivot portion 412, and a second pivot portion 413, and the second lever 42 includes a third pivot portion 421 and a fourth pivot portion 422. The driving portion 411 is matched with the driving rod 32 of the firing handle 3, the first pivoting portion 412 is pivotally connected to the housing 13 through a pin shaft, so that the first pivoting portion 412 only has a rotation motion relative to the housing 13, the second pivoting portion 413 is pivotally connected to the third pivoting portion 421 through a pin shaft, and the fourth pivoting portion 422 is pivotally connected to the closing pull rod 51 through a pin shaft, so that an axial motion of the fourth pivoting portion 422 can drive an axial motion of the closing pull rod 51. The link assembly 4 includes a third state and a fourth state which are self-stable, and the third state of the link assembly 4 is shown in fig. 8, the second pivot portion 413 and the third pivot portion 421 are located at positions far from the rack 2, the driving rod 32 abuts against the driving portion 411 of the first rod 41, and at this time, the nail head is in a fully opened state. When the head of the nail needs to be closed, the firing handle 3 is held, so that the firing handle 3 rotates anticlockwise, the handle return spring 19 is elastically deformed, the driving rod 32 drives the first rod 41 to rotate anticlockwise, the second pivot portion 413 and the third pivot portion 421 move towards the direction close to the rack 2, and at the moment, the third pivot portion 421 drives the closing pull rod 51 to move towards the proximal direction, so that the closing pull piece 53 drives the nail head to be closed. After the link assembly 4 moves to the state shown in fig. 18, the link assembly 4 enters a stable fourth state, holding the closing link 51 in the position shown in fig. 18, when the nail head is completely closed, and when the closing return spring 52 has a second deformation amount, which is larger than the first deformation amount of the closing return spring 52 when it is partially closed. Since the link assembly 4 is in the stable fourth state, even if the firing handle 3 is released, the firing handle 3 is rotated and reset clockwise by the handle reset spring 19, the state of the link assembly 4 and the closing lever 51 is not changed, and the stable closed state of the head of the nail is maintained. Thus, the linkage assembly 4, through cooperation with the firing handle 3, can effect a switching of the staple head between the fully open and fully closed conditions.

The matching mode between the closing driving mechanism and the connecting rod assembly 4 of the invention can be as follows: in the initial state, the rack 2 is located in a first position area, the locking piece 7 is located in a first state, the connecting rod assembly 4 is located in a third state, when the nail head of the anastomat needs to pass through a preset channel, the nail head needs to be partially closed, at the moment, the rack 2 is driven to move to a second position area in the proximal direction through the retraction pull rod 6, the closing pull rod 51 is driven to move to the proximal direction, the nail head is partially closed, the closing return spring 52 has a first deformation, and the locking piece 7 enters a second state and is locked relative to the rack 2. At this time, the closing lever 51 drives the link assembly 4 to an intermediate state between the third state and the fourth state, that is, the second pivot 413 and the third pivot 421 move toward the rack 2 but do not move to the highest point, and the link assembly 4 is in an unstable state. And the head can be kept in a partially closed state by the relative locking of the rack 2 and the locking member 7. The staple head may be reopened as the staple head passes through the predetermined channel into the surgical field. At this time, the rack 2 may be driven in the distal direction to return to the first position region so that the locking piece 7 is disengaged from the rack 2, the closing lever 51 moves in the distal direction to open the head of the nail, and the link assembly 4 is restored to the third state by the driving of the closing lever 51. After the head reaches the operative position, it is necessary to fully close the head, causing the anvil and cartridge assembly to clamp the tissue. At this time, there are two ways: one way is to hold the firing handle 3 and drive the linkage assembly 4 from the third state to the fourth state, i.e., to the state shown in fig. 18, via the drive rod 32, the closure pull rod 51 assembly moves in the proximal direction to effect complete closure of the staple head, at which time the closure return spring 52 has a second amount of deflection. Alternatively, the rack 2 may be driven proximally from the first position region to the third position region, and the rack 2 may drive the closure pull rod 51 assembly proximally to fully close the staple head, with the closure return spring 52 having a second amount of deflection. Meanwhile, since the closing lever 51 assembly is pivotally connected to the fourth pivot portion 422 of the second lever 42, the closing lever 51 assembly drives the link assembly 4 from the third state to the fourth state. The link assembly 4 is in a stable fourth state, which keeps the head in a fully closed state. At this time, when the stapler is fired by holding the firing handle 3 again, the rack 2 moves in the distal direction, and the closing drive unit 23 is separated from the closing rod 51. However, under the holding action of the connecting rod assembly 4, the position of the closing pull rod 51 is not changed, so that the closing stability of the nail head part in the firing process of the anastomat is ensured.

The closure driving mechanism of the present invention may also be used in conjunction with other closure switching mechanisms. The switching of the head part of the nail from the complete opening to the partial closing is realized through the closing driving mechanism, and when the head part of the nail is completely closed, the closing state of the head part of the nail is kept through the closing switching mechanism, so that the rack 2 can normally fire the anastomat.

The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.

Claims (20)

1. A closure drive mechanism for a medical stapler, the closure drive mechanism comprising:

an actuating lever provided with a closing drive portion and a first stopper portion;

a lock member including a second stopper portion located on a proximal end side of the first stopper portion when the actuation lever is in the first position region;

a closure tab assembly at least partially located on a proximal side of the closure drive portion;

When the actuating rod moves from the first position area to the second position area in the proximal direction, the closing driving part drives the closing tab assembly to move in the proximal direction, the first stopping part moves to be aligned with the second stopping part in the longitudinal direction, and the second stopping part is embedded with the first stopping part.

2. The closure drive mechanism of claim 1, further comprising a housing, the actuation rod being at least partially inside the housing, the latch being movably coupled to the housing, the latch having an axial movement and a rotational movement relative to the housing;

when the actuating rod is positioned in the first position area, the second stop part is abutted against the surface of the actuating rod, on which the first stop part is arranged, of the side surface;

when the actuating rod moves from the first position area to the second position area in the proximal direction, the locking piece rotates to enable the second stopping part to move to be embedded with the first stopping part in the direction of approaching the actuating rod.

3. The closure drive mechanism of claim 2, wherein the locking member comprises a body portion and a pivot portion secured to a proximal end of the body portion, the second locking portion is secured to a distal end of the body portion, the housing is provided with a first slot portion, and the pivot portion at least partially enters the first slot portion and is axially and rotationally movable relative to the first slot portion such that the second locking portion is movable in a direction toward and away from the actuator lever.

4. A closure drive mechanism as claimed in claim 3, wherein the pivot is axially movable in a first direction and a second direction, the first and second directions being opposite one another; and can perform rotational movement in a third direction and a fourth direction, the third direction and the fourth direction being opposite to each other;

when the pivot portion rotates in the third direction, the second stop portion is engaged with the first stop portion.

5. The closure drive mechanism of claim 4, wherein the lock further comprises a guide portion provided to the body portion, the second stop portion is provided to a side of the guide portion toward the actuation lever, the housing is provided with a second groove portion located at a distal end of the first groove portion, and the guide portion is movably provided in the second groove portion;

the guide portion is movable in a direction approaching the actuating lever and a direction separating from the actuating lever, and is axially movable in the first direction and the second direction.

6. The closure drive mechanism of claim 5, further comprising a first resilient member that applies a biasing force to the second stop in a direction toward the actuation rod.

7. The closure driving mechanism according to claim 6, wherein the first elastic member is disposed on a side of the body portion away from the actuating lever, and the first elastic member is fixedly connected with the locking member.

8. The closure drive mechanism of claim 6, wherein the first slot portion is an axially extending slot, the second slot portion has a tab disposed therein, the second slot portion is a communication channel around the tab, the communication channel includes a first channel extending from a1 position to a2 position, a second channel extending from a2 position to a3 position, and a third channel extending from a3 position to a1 position;

the a1 position is located on the distal side of the bump with a first distance between the a1 position and the actuation rod, the a2 position is located on the distal side of the bump with a second distance between the a2 position and the actuation rod, the a3 position is located on the proximal side of the bump with a third distance between the a3 position and the actuation rod, and the a2 position is located with a fourth distance between the a3 position;

the first distance is greater than the second distance, and the second distance is greater than or equal to the third distance.

9. The closure drive mechanism of claim 8, wherein the tab includes first, second, and third surfaces that are parallel to the first, second, and third channels, respectively.

10. The closure drive mechanism according to claim 8, wherein when the actuation lever moves from the first position region to the second position region in the proximal direction, the guide portion moves from the a1 position to the a2 position such that the second stopper portion is engaged with the first stopper portion.

11. The closure drive mechanism of claim 10, wherein when the actuation lever moves proximally from the second position region to a third position region, the guide moves from the a2 position to the a3 position, the pivot moves in the first direction, and then the guide returns from the a3 position to the a1 position, the pivot moves in the second direction, such that the second stop disengages from the first stop.

12. The closure drive mechanism of claim 11, wherein the first slot portion has a fifth distance in the axial direction, the fifth distance being greater than the fourth distance.

13. The closure drive mechanism of claim 11, further comprising a second resilient member that imparts a biasing force to the second stop portion toward the distal side and in a direction away from the actuation rod.

14. The closure drive mechanism of claim 8, wherein the first resilient member is disposed on a side of the body portion remote from the actuator lever, the housing further being provided with a relief groove into which the first resilient member at least partially enters when the guide portion moves to the a3 position.

15. The closure drive mechanism of claim 1, wherein the first stop portion is a slot, and wherein the second stop portion at least partially enters the first stop portion when the second stop portion is engaged with the first stop portion.

16. The closure drive mechanism of claim 15, wherein the distal side of the second stop comprises a perpendicular stop surface.

17. The closure drive mechanism of claim 16, wherein the proximal side of the second stop includes an angled guide surface that forms an acute included angle with the stop surface.

18. The closure drive mechanism of claim 1, wherein the closure drive portion is a boss disposed on one side of the actuation lever.

19. The closure drive mechanism of claim 1, wherein the closure tab assembly comprises a closure tab, a closure pull rod, and a closure return spring, the closure pull rod being secured to the closure pull rod on a proximal side thereof, the closure return spring imparting a distally directed biasing force to the closure pull rod.

20. A medical stapler comprising a closure drive mechanism according to any one of claims 1 to 19.