CN116269575A - Nail head and medical anastomat - Google Patents

Abstract

The invention provides a nail head and a medical anastomat, wherein the nail head comprises: a first jaw and a connector; the cutter is provided with a first stop part on at least one side wall; and at least one stop arm, the proximal side of the stop arm being connected to the connector, the stop arm comprising a second stop; when the stop arm is not subjected to external force and is in a first state, the stop arm is at least partially positioned close to one side wall of the cutter, the second stop part is at least partially positioned on a path of the first stop part moving towards the distal end side of the first clamp, when the stop arm is driven to at least partially move laterally outwards and is in a second state, the second stop part is separated from the path of the first stop part moving towards the distal end side of the first clamp, and at the moment, the stop arm is far away from one side wall of the cutter relative to the first state. The invention can simply and effectively prevent the secondary firing of the anastomat when the fired nail bin is not replaced.

Description

Nail head and medical anastomat

Technical Field

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

Background

In the prior art, a medical anastomat generally comprises an instrument platform, a firing handle movably connected with the instrument platform and a nail head part arranged on the instrument platform. The cartridge assembly may be passed through a small incision in the body with a penetrator to access the surgical site to perform the procedure. The nail head comprises a nail bin assembly and a nail anvil which are oppositely arranged. The cartridge assembly generally includes a cartridge, a cartridge holder, and a firing block, a cutter, and a push rod disposed in sequence from a distal side to a proximal side of the stapler, the push rod being disposed in a housing. When the anastomat is triggered, the cutter is pushed to move to the far end side by the push knife rod, the nail bin assembly and the nail anvil are closed in the moving process of the cutter, tissues between the nail bin assembly and the nail anvil are cut off, and the triggering block is driven to push out the anastomat outside the nail bin and bind the anastomat on the tissues.

After the operator finishes the suturing and cutting action, the anastomat needs to be reset, and then the nail bin assembly is replaced, so that the medical anastomat can perform the next suturing and cutting operation. However, during the surgical procedure, it may occur that the operator performs a further firing without replacing the fired cartridge, or fires without installing the cartridge, which may have undesirable consequences.

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.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a nail head and a medical anastomat, which simply and effectively prevent the secondary firing of the anastomat when the fired nail bin is not replaced.

The embodiment of the invention provides a nail head part, which is used for a medical anastomat and comprises the following components:

a first jaw and a connector, the first jaw being connected to an instrument platform of the medical stapler by the connector;

a cutter, which is positioned at the proximal end side of the first clamp, and at least one side wall of which is provided with a first stop part;

at least one stop arm, the proximal side of the stop arm being connected to the connector, the stop arm comprising a second stop;

when the stop arm is not subjected to external force and is in a first state, the stop arm is at least partially positioned close to one side wall of the cutter, the second stop part is at least partially positioned on a path of the first stop part moving towards the far end side of the first clamp, when the stop arm is driven to at least partially move laterally outwards and is in a second state, the second stop part is separated from the path of the first stop part moving towards the far end side of the first clamp, and at the moment, the stop arm is far away from one side wall of the cutter relative to the first state.

In some embodiments, the second stop portion forms an embedded fit with the first stop portion when the stop arm is not subjected to an external force.

In some embodiments, the first stop is a boss disposed on a side of the cutter, the second stop includes a stop slot, and the boss at least partially enters the stop slot and stops at a distal end of the stop slot when the stop arm is not subjected to an external force;

or, the second stopping part is a boss, the first stopping part is a stopping groove arranged on the side surface of the cutter, and when the stopping arm is not subjected to external force, the boss at least partially enters the stopping groove and is stopped at the proximal end of the stopping groove.

In some embodiments, the stop slot extends axially and the stop slot has an axial length that is greater than an axial length of the boss, the boss being axially movable in the stop slot.

In some embodiments, a firing block is also included that includes a drive that drives the stop arm at least partially laterally outboard when the firing block is located on the proximal side of the first jaw such that the second stop is out of the way of the first stop moving to the distal side of the first jaw.

In some embodiments, the stop arm is at least partially elastic, and the stop arm is at least partially elastically deformed laterally when the stop arm is driven by the driving part to move laterally at least partially outwards; after the driving part is separated from the stop arm, the stop arm returns to the initial state.

In some embodiments, the drive portion is at least partially interposed between the side wall of the cutter and the inner side wall of the stop arm when the firing block is located on the proximal side of the first jaw.

In some embodiments, the side of the drive portion opposite the stop arm is provided with a first guide surface and/or the distal inner side of the stop arm is provided with a second guide surface.

In some embodiments, the stop arm comprises a mating segment provided with the second stop and a first axially extending connection segment connected between a proximal side of the mating segment and the connection piece.

In some embodiments, when the stop arm is not subjected to an external force, a lateral distance between the mating segment and the side wall of the cutter at the second stop is smaller than a lateral distance between the first connecting segment and the side wall of the cutter.

In some embodiments, the connector includes a connector body and an axially extending securing arm, a proximal side of the securing arm being connected to a distal side of the connector body, the securing arm including a second connecting segment, the second connecting segment being secured to the first connecting segment.

In some embodiments, the shape of the second connection section is adapted to the shape of the first connection section;

the second connecting section is fixed on one side of the first connecting section, or the second connecting section and the first connecting section are fixed through injection molding.

In some embodiments, the stop arm further comprises a first extension located above the mating section, the securing arm further comprising a second extension conforming to the shape of the first extension;

the second extension section is fixed on one side of the first extension section, or the second extension section and the first extension section are fixed through injection molding.

In some embodiments, the stop arm and the fixing arm are made of different materials.

In some embodiments, the stop arm is a metal arm, the fixing arm is a plastic arm, the stop arm and the fixing arm are fixed by injection molding, and the first extension section and the first connection section of the stop arm are respectively provided with at least one through hole.

In some embodiments, the first jaw includes a cartridge housing having a mating aperture formed in a bottom surface thereof, the bottom surface of the securing arm at least partially entering the mating aperture;

a first stop part is arranged on the proximal end side of the fixed arm and is propped against the proximal end surface of the matching hole; and/or, a second stop part is arranged on the distal end side of the fixed arm, and the second stop part abuts against the distal end surface of the matching hole.

In some embodiments, a proximal side of the connector body is provided with a proximal connection secured to a distal side of a magazine housing of the instrument platform;

the interior of the connector body defines an axially extending channel for passing through a closure tab and firing bar of the medical stapler.

In some embodiments, further comprising a second jaw and a secondary opening, the proximal side of the second jaw and the proximal side of the first jaw being connected by a closure pin, the secondary opening being movable in an axial direction, the secondary opening comprising a lifting portion and a pin mating portion;

when the closing pin moves towards the distal end side, the closing pin drives the pin matching part to drive the auxiliary opening piece to move towards the distal end side, and the lifting part drives the second clamping jaw to move towards a direction away from the first clamping jaw.

In some embodiments, the proximal side of the auxiliary opening member is provided with a first mating portion, the proximal side of the fixing arm is provided with a second mating portion, and the first mating portion is stopped at the second mating portion when the auxiliary opening member moves in the distal direction.

In some embodiments, the distal side of the connector body comprises a stop surface, the proximal side of the auxiliary opening being provided with a third stop;

when the closing pin moves towards the proximal side, the closing pin drives the auxiliary opening piece to move towards the proximal side through the pin matching part, and the third stop part is stopped on the stop surface.

In some embodiments, the pin mating portion includes a mating slot and a boss disposed on a sidewall of the mating slot, a distal end of the mating slot being closed, the closure pin at least partially entering the mating slot and being located between the distal end of the mating slot and the boss;

when the closing pin moves towards the proximal direction, the closing pin is matched with the protruding part to drive the auxiliary opening piece to move towards the proximal direction.

The embodiment of the invention also provides a medical anastomat, which comprises the nail head.

The nail head and the medical anastomat provided by the invention have the following advantages:

the invention provides a nail bin assembly for a medical anastomat, wherein a stop arm is arranged at the far end of a connecting piece, when the anastomat is ready to be fired, external force is applied to the stop arm to enable at least part of the stop arm to transversely move outwards and far away from the side wall of a cutter, the cutter is not blocked from moving towards the far end side, and the anastomat can be normally fired at the moment. After the anastomat is completely fired, the cutter returns to the proximal side of the staple head, the stop arm is not subjected to external force and is close to the side wall of the cutter, the cutter is blocked from moving towards the distal side by the cooperation of the second stop part and the first stop part, and the anastomat cannot be fired at the moment, so that the secondary firing of the anastomat when the fired staple bin is not replaced is effectively prevented.

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 the configuration of the engagement of a staple head and a magazine housing in accordance with one embodiment of the present invention;

FIG. 2 is a schematic view of the configuration of the cartridge housing mated with the staple head after removal of the cartridge frame in accordance with one embodiment of the present invention;

FIG. 3 is a schematic view of the structure of the nail head and push rod of the invention after removing the nail bin and the nail bin frame;

FIG. 4 is a schematic view showing the structure of a cutter according to an embodiment of the present invention;

FIG. 5 is a schematic view showing the configuration of the cutter and the connecting assembly according to an embodiment of the present invention;

FIG. 6 is a schematic view of the coupling assembly mated with the magazine housing in accordance with one embodiment of the present invention;

FIGS. 7 and 8 are schematic views of the configuration of a connector assembly mated with a cartridge bay in accordance with an embodiment of the present invention;

FIG. 9 is a bottom view of the coupling assembly mated with the cutter when the stop arm of one embodiment of the present invention is in a first state;

FIGS. 10 and 11 are schematic structural views of a connection assembly according to an embodiment of the present invention;

FIG. 12 is a schematic view of a connector engaging a stop arm according to an embodiment of the present invention;

FIG. 13 is a schematic view of the firing block, cutter and attachment assembly of an embodiment of the present invention;

FIG. 14 is a bottom view of the firing block, knife and attachment assembly engaged with the stop arm in a first state according to one embodiment of the present invention;

FIG. 15 is a schematic view of the structure of a firing block according to one embodiment of the present invention;

fig. 16 and 17 are schematic structural views showing the engagement of the auxiliary opening member with the connection assembly according to an embodiment of the present invention.

Reference numerals:

11. proximal attachment of cartridge 52

12. Stop surface of cartridge rack 53

121. Fitting hole 54 fixing arm

122. Second connecting section of outer sleeve 541

113. Second extension of first pin slot 542

13. First stop portion of anvil 543 (near)

131. Second stop portion (distal) of second pin slot 544

14. Second mating portion of closing pin 545

21. Nail box shell 55 channel

211. Mounting groove 6 stop arm

22. Fitting section of closing tab 61

23. Stop groove of firing bar 611

3. Second guide surface of cutter 612

31. First connecting section of boss 62

32. First extension of blade 63

33. Cutter side wall 64 through hole

4. Auxiliary opening piece of firing block 7

41. Drive part 71 lifting part

411. The first guide surface 72 engages the slot

42. Protruding part of the nail pushing part 73

5. First mating portion of the connecting member 74

51. Third stop portion of the connector body 75

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.

The invention provides a nail bin assembly for a medical anastomat and the medical anastomat comprising the same. The medical anastomat comprises an instrument platform, a firing handle movably connected with the instrument platform and a nail head arranged on the instrument platform, wherein the nail head is positioned at the distal end side of the instrument platform. The nail head includes: a first jaw and a connector, the first jaw being connected to an instrument platform of the medical stapler by the connector; the cutter is provided with a first stop part on at least one side wall; and at least one stop arm, a proximal side of the stop arm being connected to the connector, the stop arm comprising a second stop. The stop arm includes a first state and a second state, the stop arm being closer to a sidewall of the cutter when in the first state than in the second state.

When the anastomat is ready to be fired, external force is applied to the stop arm to enable the stop arm to at least partially transversely move outwards and away from the side wall of the cutter, the second stop part is separated from the path of the first stop part moving towards the distal end side of the first clamp, and the stop arm is in a second state and is far away from the side wall of the cutter compared with the first state. At this time, the stop arm does not block the movement of the cutter in the distal direction, and the stapler can be normally fired by driving the cutter to move in the distal direction. After the anastomat is triggered, the cutter returns to the proximal side of the nail head, the stop arm is not subjected to external force and is close to the side wall of the cutter, the second stop part is positioned on the path of the first stop part moving to the distal side of the first clamp, and the cutter is blocked from moving to the distal side direction through the cooperation of the second stop part and the first stop part, so that the anastomat cannot be triggered at the moment, and the secondary triggering of the anastomat when the triggered nail bin is not replaced is effectively prevented.

The structure of the nail head of each embodiment of the present invention will be described in detail with reference to the accompanying drawings, and it will be understood that each embodiment is not intended as a limitation on the scope of the present invention.

Fig. 1 to 17 show the structure of a nail head according to an embodiment of the present invention. As shown in fig. 1 and 2, the head includes oppositely disposed first and second jaws. The structure of this embodiment will be specifically described below taking the first jaw as a cartridge module and the second jaw as an anvil 13 as an example. The cartridge assembly includes a cartridge 11 containing staples and a cartridge bay 12 containing the cartridge 11. The nail head part further comprises a connecting piece 5, a cutter 3 and at least one stop arm 6, and the connecting piece 5 and the stop arm 6 form a connecting assembly together. The stop arm 6 comprises a first condition close to the cutter 3 and a second condition remote from the cutter 3. The cartridge assembly and the anvil 13 are connected to a magazine housing 21 of the instrument platform by the connector 5. As shown in fig. 3 to 6, in the initial state, the cutter 3 is positioned on the proximal end side of the cartridge 11. The distal side of the cutter 3 is provided with a blade 32 for cutting tissue, and at least one side wall 33 of the cutter 3 is provided with a first stop. The proximal side of the stop arm 6 is connected to the connector 5, the stop arm 6 comprising a second stop.

When the anastomat is ready to be fired, an external force is applied to the stop arm 6 to enable the stop arm 6 to move at least partially outwards transversely and away from the side wall 33 of the cutter 3, the second stop part is separated from the path of the first stop part moving towards the distal end side of the staple cartridge, at the moment, the stop arm 6 is in the second state and does not block the movement of the cutter 3 towards the distal end side, and the anastomat can be fired normally by driving the cutter 3 to move towards the distal end side. After the anastomat is completely fired, the cutter 3 returns to the proximal side of the staple head, the stop arm 6 is not subjected to external force but is close to the side wall 33 of the cutter 3, and is in a first state, the second stop part is positioned on the path of the movement of the first stop part to the distal side of the staple cartridge, and the cutter 3 is blocked from moving to the distal side by the cooperation of the second stop part and the first stop part, so that the anastomat cannot be fired at the moment, and the secondary firing of the anastomat when the fired staple cartridge 11 is not replaced is effectively prevented.

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 cartridge bay 12. The S1 direction in fig. 1 is defined as the direction from the distal side to the proximal side of the stapler. The S1 direction or the direction opposite to the S1 direction is taken as the axial direction of the anastomat. The S2 direction in fig. 1 is defined as the longitudinal direction, i.e. the height direction. The S3 direction in fig. 14 is defined as the lateral direction, i.e., the width direction. In the present invention, the inner side and the outer side of one member are the inner side with respect to the axis of the stapler, and the outer side away from the axis.

As shown in fig. 4 and 5, in this embodiment, the first stopper is a boss 31 provided at a side surface of the cutter 3. The boss 31 may be a cylindrical boss, a cuboid boss, or a boss with a trapezoid, a diamond, an ellipse, or other shapes in cross section. The connector 5 comprises a connector body 51. The stop arm 6 comprises a mating section 61 and an axially extending first connecting section 62, the proximal side of the mating section 61 being connected to the distal side of the connector body 51 by means of the first connecting section 62. The second stop portion includes a stop groove 611, and when the stop arm 6 is not subjected to an external force, the boss 31 at least partially enters the stop groove 611 and is located at the distal end of the stop groove 611. In this embodiment, the stop groove 611 is a kidney-shaped groove, the stop groove 611 extends in the axial direction, and the axial length of the stop groove 611 is greater than the axial length of the boss 31, and the boss 31 is axially movable in the stop groove 611. In another embodiment, the stop groove 611 may also be connected to the lower surface or the upper surface of the mating section 61, as long as the distal end closure of the stop groove 611 is satisfied and the boss 31 may be stopped at the distal end side of the stop groove 611. The stop groove 611 may communicate the inner and outer surfaces of the mating section 61, or the stop groove 61 may be provided only on the inner surface of the mating section 61. In still another embodiment, the second stopping portion may be a boss, the first stopping portion may be a stopping groove disposed on a side surface of the cutter 3, at least a proximal end of the stopping groove is closed, and when the stopping arm is not subjected to an external force, the boss at least partially enters the stopping groove and is stopped at the proximal end of the stopping groove. In still another embodiment, the first stop portion and the second stop portion may be bosses, and when the stop arm 6 is not subjected to an external force, the second stop portion may be located at a distal end side of the first stop portion, and stop movement of the first stop portion in a distal end side direction.

The manner in which the connector 5 is connected to the cartridge assembly and the magazine housing 21 is shown in fig. 6-8. As shown in fig. 6, the proximal side of the connector body 51 is provided with a proximal connection 52, the proximal connection 52 being secured to the distal side of the magazine housing 21 of the instrument platform. Specifically, the proximal end connecting portion 52 includes two fixing posts, and the magazine housing 21 is provided therein with mounting grooves 211 corresponding to the shapes of the fixing posts, and the fixing posts are fixed in the mounting grooves 211. The magazine housing 21 comprises an upper housing and a lower housing, the mounting groove 211 of which is only exemplarily shown in fig. 6, the upper housing being also provided with a mounting groove corresponding to the mounting groove 211 of the lower housing.

As shown in fig. 6, the inside of the connector body 51 defines an axially extending channel for passing through the closing tab 22 and the firing bar 23 of the medical stapler, the firing bar 23 passing through the channel to engage the proximal side of the cutter 3, and the closing tab 22 passing through the channel to engage one of the closing pins 14. The connector 5 further comprises a fixing arm 54, the proximal side of the fixing arm 54 being connected to the distal side of the connector body 51. The bottom surface of the cartridge holder 12 is provided with a mating hole 121, and the bottom surface of the fixing arm 54 at least partially enters the mating hole 121. The proximal end side of the fixing arm 54 is provided with a first stopper 543, the first stopper 543 abuts against the proximal end face of the fitting hole 121, the distal end side of the fixing arm 54 is provided with a second stopper 544, and the second stopper 544 abuts against the distal end face of the fitting hole 121. As shown in fig. 7, the proximal end side of the cartridge holder 12 is provided with a sleeve portion 122, the sleeve portion 122 is sleeved outside the connector body 51, and the outer contour of the connector body 51 and the inner contour of the sleeve portion 122 are non-circular cross sections, so as to prevent the sleeve portion 122 from rotating relative to the connector body 51, and the sleeve portion 122 and the connector body 51 are tightly matched with each other.

The operation of the staple head of this embodiment will now be described in detail with reference to figures 5 and 9 to 15. Fig. 5 and 9 show a state in which the boss 31 is blocked from moving in the distal direction when the stopper arm 6 is not subjected to an external force, hereinafter referred to as a first state, and fig. 13 and 14 show a state in which the stopper arm 6 is subjected to an external force to move laterally outward so that the stopper groove 611 does not block the boss 31 from moving in the distal direction, hereinafter referred to as a second state.

The cartridge assembly further includes a firing block 4, the firing block 4 including a staple pusher 42. When the anastomat is triggered, the cutter 3 can drive the trigger block 4 to move towards the distal end side, so that the staple pushing part 42 pushes staples in the staple cartridge 11 out towards the anvil 13. In this embodiment, the switching of the stop arm 6 between the first state and the second state is effected by the firing block 4. As shown in fig. 15, the firing block 4 further includes a driving portion 41, and the driving portion 41 is an extension arm disposed on the proximal end side of the firing block 4. When the firing block 4 is located at the proximal end side of the staple cartridge 11, the driving portion 41 drives the stop arm 6 to laterally move outward, so that the stop arm 6 enters the second state from the first state, and the stop groove 611 is separated from the boss 31.

In this embodiment, the stop arm 6 is at least partially elastic, for example, the stop arm 6 may be made of a metal sheet, but the present invention is not limited thereto. When the stopper arm 6 is driven to move laterally outward by the driving portion 41, the stopper arm 6 is at least partially elastically deformed laterally; after the driving part 41 is separated from the stop arm 6, the engaging section 61 returns to the original state by the elastic deformation restoring force.

In the initial state, the cutter 3 and the firing block 4 are both positioned at the proximal end side of the cartridge assembly. The driving part 41 of the firing block 4 drives the stop arm 6 to laterally move outwards, so that the stop arm 6 enters the second state, the stop arm 6 is at least partially elastically deformed in the lateral direction, and the stop groove 611 is separated from the boss 31. At this time, the cutter 3 is driven to move in the distal direction by the firing bar 23, the cutter 3 drives the firing block 4 to move in the distal direction to push out staples from the anvil 13, the staples are stapled on the tissue, and the cutter 3 cuts the tissue, so that the firing of the stapler is completed. After the stapler firing is completed, the cutter 3 is returned to the proximal side of the cartridge assembly, while the firing block 4 remains on the distal side of the cartridge assembly. At this time, the stop arm 6 is no longer acted by the firing block 4, the stop arm 6 returns to the first state again under the action of the elastic deformation restoring force, that is, the stop groove 611 forms an embedded fit with the boss 31, and the boss 31 is stopped at the distal end of the stop groove 611, that is, the cutter 3 cannot be driven to move in the distal direction to fire the anastomat.

As shown in fig. 5 and 9, when the stop arm 6 is in the first state, the boss 31 at least partially enters the stop groove 611 and is stopped at the distal end of the stop groove 611. When a force is applied to the cutter 3 in a distal direction by the firing bar 23, the cutter 3 cannot continue to move in the distal direction because the boss 31 is blocked by the distal surface of the blocking groove 611, and thus the stapler cannot be fired. As shown in fig. 9, when the stopper arm 6 is not subjected to an external force, the lateral distance (distance in the S3 direction) between the engaging section 61 and the side wall 33 of the cutter 3 at the stopper groove 611 is smaller than the lateral distance (distance in the S3 direction) between the first connecting section 62 and the side wall 33 of the cutter 3, that is, the stopper groove 611 is closer to the side wall of the cutter 3 than the first connecting section 62. Thereby, when the firing block 4 enters between the mating segment 61 and the side wall 33 of the cutter 3, elastic deformation occurs more easily at the connection position of the mating segment 61 and the first connecting segment 62, so that the mating segment 61 moves laterally toward the outside. In this embodiment, the boss 31 is disposed on both sides of the cutter 3, and one stop arm 6 is disposed on both sides of the cutter 3, and the stop groove 611 of each stop arm 6 is respectively engaged with one boss 31. The lateral distance between the two stop arms 6 at the stop groove 611 is smaller than the lateral distance between the first connecting sections 62 of the two stop arms 6, the stop arms 6 being inclined at the stop groove 611 towards the side wall 33 of the cutter 3.

As shown in fig. 10 to 12, in this embodiment, the stopper arm 6 is fixed to the distal end side of the connector body 51 by the fixing arm 54. The fixing arm 54 includes a second connection section 541, the second connection section 541 is fixed to the first connection section 62, and the structural strength of the first connection section 62 of the stopper arm 6 can be enhanced and the stopper arm 6 can be fixed to the distal end side of the connector body 51 by the connection fit of the second connection section 541 to the first connection section 62. In this embodiment, the shape of the second connection section 541 is adapted to the shape of the first connection section 62. The second connection section 541 is fixed to one side of the first connection section 62, for example, by bonding, welding, or the like, or the second connection section 541 and the first connection section 62 are fixed by injection molding. In order to further enhance the engagement of the stop arm 6 with the fixing arm 54, the stop arm 6 further comprises a first extension 63, wherein the first extension 63 is located above the engagement section 61 and is separated from the engagement section 61, i.e. does not obstruct the lateral movement of the engagement section 61, and the fixing arm 54 further comprises a second extension 542 adapted to the shape of the first extension 63. The second extension section 542 is fixed to one side of the first extension section 63, for example, by bonding, welding, or the like, or the second extension section 542 and the first extension section 63 are fixed by injection molding.

The stop arm 6 and the fixing arm 54 may be made of different materials, and the two may be combined to obtain a better fit. In this embodiment, the stop arm 6 is a metal arm, the fixing arm 54 is a plastic arm, the stop arm 6 and the fixing arm 54 are fixed by injection molding, and the first extension section 63 and the first connection section 62 of the stop arm 6 are respectively provided with at least one through hole 64 to enhance the bonding strength between the stop arm 6 and the fixing arm 54 during the injection molding.

As shown in fig. 13 to 15, when the firing block 4 is located at the proximal end side of the cartridge assembly, the driving portion 41 at least partially enters between the side wall 33 of the cutter 3 and the inner side wall of the mating segment 61, so as to spread the mating segment 61 outward, so that the mating segment 61 moves laterally outward, and the stop groove 611 is separated from the boss 31. In this embodiment, the firing block 4 is provided with two of the driving portions 41 correspondingly. At this time, when the cutter 3 is driven to move in the distal direction by the firing bar 23, the cutter 3 may drive the firing block 4 to move in the distal direction together, the firing block 4 pushes out staples, and the cutter 3 cuts tissue to perform firing of the stapler. In order to better guide the drive part 41 into between the mating section 61 and the side wall 33 of the cutter 3, the side of the drive part 41 opposite the stop arm 6 is provided with an inclined first guide surface 411, and the distal inner side of the mating section 61 is provided with an inclined second guide surface 612.

As shown in fig. 1, the head includes an oppositely disposed anvil 13 and cartridge assembly, the anvil 13 having a third condition open relative to the cartridge assembly and a fourth condition closed relative to the cartridge assembly. The proximal side of the anvil 13 is provided with a first pin slot 123 arranged obliquely, the proximal side of the cartridge assembly is provided with a second pin slot 131 extending along the axial direction, and one closing pin 14 is simultaneously arranged in the first pin slot 123 and the second pin slot 131 in a penetrating manner. The anvil 13 is in the third state when the closing pin 14 is located on the distal side of the second pin slot 131, the anvil 13 enters the fourth state when the closing pin 14 moves from the distal side of the second pin slot 131 to the proximal side, and the anvil 13 and the cartridge assembly clamp tissue. The process of the anvil 13 entering the fourth state from the third state is called the closing process of the staple head. The instrument platform is provided with a closing pull piece 22 for closing the nail head, the distal end side of the closing pull piece 22 is connected with the closing pin 14, and when the closing pull piece 22 moves to the proximal end side, the closing pin 14 can be pulled to move to the proximal end side, so that the nail head is closed.

As shown in fig. 16 and 17, in this embodiment, the head further comprises an auxiliary opening member 7 for auxiliary opening of the head after the completion of the firing of the stapler, the auxiliary opening member 7 being movable in the axial direction. The auxiliary opening 7 comprises a lifting portion 71 and a pin mating portion. As shown in fig. 16, the raised portion 71 is a protruding portion provided toward the second clamp direction. Fig. 16 shows the position of the auxiliary opening member 7 and the closing pin 14 when the nail head is opened, and fig. 17 shows the position of the auxiliary opening member 7 and the closing pin 14 when the nail head is closed. In this embodiment, the pin mating portion includes a mating slot 72 and a boss 73 provided to a side wall of the mating slot 72, the distal end of the mating slot 72 is closed, and the closing pin 14 at least partially enters the mating slot 72 and is located between the distal end of the mating slot 72 and the boss 73. The opening height of the fitting groove 72 at the position of the boss 73 is smaller than the diameter of the closing pin 14, and the closing pin 14 is held in the fitting groove 72 without being separated from the fitting groove 72.

When the closing tab 22 is driven to move in the proximal direction, the closing tab 22 drives the closing pin 14 to move in the proximal direction, and the closing pin 14 cooperates with the protrusion 73 to drive the auxiliary opening member 7 to move in the proximal direction. The distal side of the connector body 51 comprises a stop surface 53 and the proximal side of the auxiliary opening 7 is provided with a third stop 75. When the auxiliary opening member 7 moves in the proximal direction, the third stopper 75 is stopped at the stopper surface 53, thereby limiting the movement range of the auxiliary opening member 7 in the proximal direction. At this time, the closing pin 14 and the auxiliary opening member 7 are located at the position of fig. 17, the nail head is closed, and the lifting portion 71 of the auxiliary opening member 7 does not lift the nail anvil 13, so as to keep the stability of closing the nail head.

In the state of fig. 17, when the nail head needs to be opened after the completion of the firing of the stapler, the closing pin 14 is driven to move in the distal direction by the closing tab 22, and the closing pin 14 abuts against the distal surface of the engagement groove 72 to drive the auxiliary opening 7 to move in the distal direction. At this time, the lifting portion 71 drives the anvil 13 to move in a direction away from the cartridge frame 12 to assist in opening the nail head. After the head is opened, the closing pin 14 and the auxiliary opening member 7 return to the state shown in fig. 16. The proximal end side of the auxiliary opening member 7 is provided with a first engaging portion 74, the proximal end side of the fixing arm 54 is provided with a second engaging portion 545, and when the auxiliary opening member 7 moves in the distal direction, the first engaging portion 74 is stopped at the second engaging portion 545, thereby limiting the movement range of the auxiliary opening member 7 in the distal direction. In this embodiment, the auxiliary opening element 7 is located above the fixed arm 54. The first engaging portion 74 may be a downward protrusion provided on the proximal end side of the auxiliary opening 7, and the second engaging portion 545 may be a downward recess provided on the proximal end of the fixing arm 54, or the first engaging portion 74 may be a recess, and the second engaging portion 545 may be a protrusion.

The above embodiments are described using the first jaw as a cartridge assembly and the second jaw as an anvil. It is understood that in other alternative embodiments, the first jaw may be an anvil and the second jaw a cartridge assembly, while remaining within the scope of the present invention.

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 (22)

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

a first jaw and a connector, the first jaw being connected to an instrument platform of the medical stapler by the connector;

a cutter, which is positioned at the proximal end side of the first clamp, and at least one side wall of which is provided with a first stop part;

at least one stop arm, the proximal side of the stop arm being connected to the connector, the stop arm comprising a second stop;

when the stop arm is not subjected to external force and is in a first state, the stop arm is at least partially positioned close to one side wall of the cutter, the second stop part is at least partially positioned on a path of the first stop part moving towards the far end side of the first clamp, when the stop arm is driven to at least partially move laterally outwards and is in a second state, the second stop part is separated from the path of the first stop part moving towards the far end side of the first clamp, and at the moment, the stop arm is far away from one side wall of the cutter relative to the first state.

2. The staple head of claim 1 wherein the second stop forms a snap fit with the first stop when the stop arm is not subjected to an external force.

3. The stapling head according to claim 2, wherein the first stop is a boss provided on a side surface of the cutter, the second stop comprises a stop groove, and the boss at least partially enters the stop groove and is stopped at a distal end of the stop groove when the stop arm is not subjected to an external force;

or, the second stopping part is a boss, the first stopping part is a stopping groove arranged on the side surface of the cutter, and when the stopping arm is not subjected to external force, the boss at least partially enters the stopping groove and is stopped at the proximal end of the stopping groove.

4. A staple head according to claim 3 wherein the stop groove extends axially and the axial length of the stop groove is greater than the axial length of the boss, the boss being axially movable in the stop groove.

5. The staple head of claim 1 further comprising a firing block comprising a drive that drives the stop arm at least partially laterally outboard to disengage the second stop from a path of movement of the first stop to the distal side of the first jaw when the firing block is positioned on the proximal side of the first jaw.

6. The stapling head according to claim 5, wherein the stop arm is at least partially resilient, and wherein the stop arm is at least partially resiliently deformed laterally when driven by the drive portion to move laterally at least partially laterally outwardly; after the driving part is separated from the stop arm, the stop arm returns to the initial state.

7. The staple head of claim 5 wherein said drive portion is at least partially interposed between a side wall of said cutter and an inner side wall of said stop arm when said firing block is positioned on a proximal side of said first jaw.

8. The stapling head according to claim 7, wherein a side of the driving portion opposite the stop arm is provided with a first guide surface and/or a distal inner side of the stop arm is provided with a second guide surface.

9. The stapling head according to claim 1, wherein the stop arm comprises a mating section provided with the second stop and an axially extending first connecting section connected between a proximal side of the mating section and the connecting piece.

10. The stapling head according to claim 9, wherein the lateral distance between the mating section and the side wall of the cutter at the second stop is smaller than the lateral distance between the first connecting section and the side wall of the cutter when the stop arm is not subjected to an external force.

11. The tack head of claim 9, wherein the connector includes a connector body and an axially extending securing arm, a proximal side of the securing arm being connected to a distal side of the connector body, the securing arm including a second connecting section, the second connecting section being secured to the first connecting section.

12. The tack head of claim 11, wherein the shape of the second connecting section conforms to the shape of the first connecting section;

the second connecting section is fixed on one side of the first connecting section, or the second connecting section and the first connecting section are fixed through injection molding.

13. The tack head of claim 12, wherein the stop arm further comprises a first extension located above the mating section, the securing arm further comprising a second extension conforming to the shape of the first extension;

the second extension section is fixed on one side of the first extension section, or the second extension section and the first extension section are fixed through injection molding.

14. The staple head of claim 13 wherein said stop arm and said securing arm are of different materials.

15. The stapling head according to claim 13, wherein the stop arm is a metal arm, the fixing arm is a plastic arm, the stop arm and the fixing arm are fixed by injection molding, and the first extension section and the first connection section of the stop arm are respectively provided with at least one through hole.

16. The staple head of claim 11 wherein the first jaw comprises a cartridge frame having a mating aperture formed in a bottom surface thereof, the bottom surface of the securing arm at least partially entering the mating aperture;

a first stop part is arranged on the proximal end side of the fixed arm and is propped against the proximal end surface of the matching hole; and/or, a second stop part is arranged on the distal end side of the fixed arm, and the second stop part abuts against the distal end surface of the matching hole.

17. The stapling head according to claim 11, wherein a proximal side of the connector body is provided with a proximal connection portion, the proximal connection portion being secured to a distal side of a staple cartridge housing of the instrument platform;

the interior of the connector body defines an axially extending channel for passing through a closure tab and firing bar of the medical stapler.

18. The stapling head according to claim 11, further comprising a second jaw and a secondary opening member, the proximal side of the second jaw and the proximal side of the first jaw being connected by a closure pin, the secondary opening member being movable in an axial direction, the secondary opening member comprising a lifting portion and a pin mating portion;

when the closing pin moves towards the distal end side, the closing pin drives the pin matching part to drive the auxiliary opening piece to move towards the distal end side, and the lifting part drives the second clamping jaw to move towards a direction away from the first clamping jaw.

19. A head according to claim 18, wherein the proximal side of the auxiliary opening member is provided with a first engagement portion and the proximal side of the securing arm is provided with a second engagement portion, the first engagement portion being stopped at the second engagement portion when the auxiliary opening member is moved in the distal direction.

20. The tack head of claim 18 wherein the distal side of the connector body includes a stop surface, the proximal side of the auxiliary opening being provided with a third stop;

when the closing pin moves towards the proximal side, the closing pin drives the auxiliary opening piece to move towards the proximal side through the pin matching part, and the third stop part is stopped on the stop surface.

21. The tack head of claim 18, wherein the pin mating portion includes a mating slot and a boss disposed on a sidewall of the mating slot, a distal end of the mating slot being closed, the closure pin at least partially entering the mating slot and being located between the distal end of the mating slot and the boss;

when the closing pin moves towards the proximal direction, the closing pin is matched with the protruding part to drive the auxiliary opening piece to move towards the proximal direction.

22. A medical stapler comprising a stapling head according to any one of claims 1 to 21.

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