Closing driving mechanism and medical anastomat comprising sameTechnical Field
The invention relates to the technical field of medical instruments, in particular to a closing driving mechanism and a medical anastomat comprising the same.
Background
Digestive tract diseases are one of the diseases of high incidence of human beings, and during the treatment process, a medical anastomat is often used for anastomosing physiological tissues such as digestive tract and the like instead of manual operation of doctors. The medical anastomat is a common surgical instrument, and most of the medical anastomat adopts an axial internal stapling mode, and forms end-to-end or end-to-side anastomosis on physiological tissues such as esophagus, stomach, intestinal canal and the like during operation, two sections of tissues are accommodated in the medical anastomat in a astringing way during anastomosis, and a circular anastomosis opening is formed on the tissues after the completion of percussion, so that a human body channel is reconstructed.
In the prior art, the medical anastomat comprises a medical anastomat body, an operating handle movably connected with the medical anastomat body and a nail head matched with the medical anastomat body. The nail head part comprises a nail bin and a nail anvil which are oppositely arranged. When in operation, the movable handle is held firstly, the closing pulling piece at the head of the staple is pulled to move towards the proximal end side of the anastomat through the closing driving mechanism, so that after the staple cartridge and the anvil assembly are closed, the operation handle is held again, the staples can be pushed to move towards tissues, and the tissues are anastomosed through the forming of the staples in the staple cartridge at the anvil assembly. 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 the existing closing driving mechanism, the structure is complex, and in the process of firing the anastomat, the closing pulling piece can be displaced towards the distal end side direction of the anastomat, so that the closing effect between the nail bin and the nail anvil is influenced, and the operation effect is adversely affected.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a closing driving mechanism and a medical anastomat comprising the same, wherein the position of the closing driving mechanism is limited when a nail head is closed by a retainer, so that a closing pull tab is prevented from moving towards the distal end side of the anastomat when the anastomat is fired.
The embodiment of the invention provides a closing driving mechanism which is used for a medical anastomat and comprises a movable handle, a first sliding block, a retaining piece, a steering assembly and a closing driving piece, wherein the steering assembly is connected between the first sliding block and the closing driving piece, a groove is formed in the first sliding block, the first sliding block is positioned at the proximal end side of the retaining piece in an initial state, when the movable handle is held, the movable handle pushes the first sliding block to move towards the distal end side of the anastomat, the steering assembly converts the movement of the first sliding block towards the distal end side of the anastomat into the movement of the closing driving piece towards the proximal end side of the anastomat, and the retaining piece at least partially enters the groove of the first sliding block to block the movement of the first sliding block towards the proximal end side of the anastomat.
Optionally, the steering assembly includes a steering support beam and a pull rope, the steering support beam is located at a proximal end side of the first slider, the pull rope is sleeved outside the steering support beam, and the pull rope is connected between the first slider and the closing driving member.
Optionally, the steering assembly comprises a steering support beam provided with a pulley, and the stay cord is arranged on the outer surface of the pulley.
Optionally, the medical anastomat comprises a nail head and a closing pulling piece for closing the nail head, the closing driving piece is sleeved outside the closing pulling piece, and the closing driving piece and the closing pulling piece are axially fixed.
Optionally, a sleeve is further sleeved outside the closing pull tab, the closing driving piece is sleeved outside the sleeve, a travel groove extending along the axial direction of the anastomat is formed in the side face of the sleeve, a connecting pin is arranged in the closing driving piece and inserted into the travel groove, and the connecting pin can move along the extending direction of the travel groove.
Optionally, the proximal side of the closure driving member is provided with a biasing member, which biases the closure driving member in a direction towards the distal side of the stapler.
Optionally, the movable handle is connected to a link, and when the movable handle is held, the distal end side of the link pushes the first slider to move toward the distal end side of the stapler.
Optionally, the closing driving mechanism further comprises an actuating rod, when the movable handle is held, the movable handle pushes the actuating rod to move towards the distal side direction of the anastomat, and the actuating rod presses the retainer downwards so that the retainer at least partially enters the groove of the first sliding block.
Optionally, a firing member is provided on the distal side of the actuation bar, and when the firing member is moved in the distal direction of the stapler, the holding member is pressed downward so that the holding member at least partially enters the recess of the first slider.
Optionally, the holding piece comprises a second sliding block, one side of the second sliding block is provided with a boss, and when the movable handle is held, the boss enters the groove of the first sliding block.
Optionally, the retainer further includes a third slider, and the third slider is provided with a receiving groove for receiving the second slider.
Optionally, a fifth inclined plane is arranged at the proximal side of the third slider, an inclined table surface is arranged at the distal side of the firing part, and the fifth inclined plane and the inclined table surface are mutually guided.
Optionally, a first biasing member is disposed in the accommodating groove, and the first biasing member provides a downward biasing force to the second slider.
Optionally, a second biasing member is disposed below the third slider, and the second biasing member provides an upward biasing force to the third slider.
Optionally, a flange is provided on one side of the actuating rod, and when the movable handle is held, the flange moves towards the distal end side direction of the anastomat to contact with the top surface of the third slider, and presses the third slider to drive the second slider to move downwards.
Optionally, in a proximal side view of the stapler, the flange and the boss of the second slider are located on either side of the actuation rod, respectively.
Optionally, the distal side of the first slider is a first inclined surface, the first inclined surface is inclined upwards from the distal side to the proximal side, and the proximal side of the boss is a second inclined surface matched with the first inclined surface.
Optionally, the proximal side of the groove is a third inclined plane matching with the second inclined plane, and the distal side of the groove and the distal side of the boss are vertical planes.
Optionally, the holding piece includes a shrapnel, the shrapnel includes a fixed end, a pressing part and a movable end, the fixed end is fixed on the anastomat, when the actuating rod presses the pressing part downwards, the movable end enters the groove of the first sliding block.
Optionally, the fixed end of the elastic piece is located at the distal end side of the movable end, and the movable end is bent downward and toward the distal end side of the anastomat to form a matching part matched with the groove of the first slider.
Optionally, the distal side of the first slider is a first inclined plane, the first inclined plane is inclined upwards from the distal side to the proximal side, and the proximal side of the mating portion is a fourth inclined plane mated with the first inclined plane.
Optionally, the proximal side of the groove is a third inclined surface matched with the fourth inclined surface, the distal side of the groove is a vertical surface, and the movable end of the spring plate is formed with a vertical surface matched with the distal side of the groove.
The embodiment of the invention also provides a medical anastomat, which comprises any one of the closing driving mechanisms.
The closing driving mechanism and the medical anastomat comprising the same provided by the invention have the following advantages:
the invention provides a closing driving mechanism for a medical anastomat, which limits the position of the closing driving mechanism when a nail head is closed through a retainer, and prevents a closing pulling piece from moving towards the distal side direction of the anastomat when the anastomat is triggered, thereby ensuring the closing stability of the nail head in the triggering process of the anastomat and improving the operation effect.
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 closure drive mechanism of a first embodiment of the present invention mated with a housing;
FIG. 2 is a schematic view of the closure drive mechanism of the first embodiment of the present invention in cooperation with other components of the stapler;
FIG. 3 is a perspective view of a closure drive mechanism according to a first embodiment of the present invention mated with other components of the stapler;
FIG. 4 is a schematic view of the structure of a closure driving mechanism according to a first embodiment of the present invention;
FIG. 5 is a schematic view of a first embodiment of the present invention showing the distal side of a closure drive mechanism;
FIG. 6 is a schematic view of the first slider and keeper engagement of the first embodiment of the present invention;
fig. 7 is a schematic structural view of a holder according to a first embodiment of the present invention;
FIG. 8 is a schematic view of the structure of a first slider according to the first embodiment of the present invention;
FIG. 9 is a rear view of the actuator lever of the first embodiment of the present invention;
FIG. 10 is a schematic view of a closure drive mechanism of a second embodiment of the present invention mated with a housing;
FIG. 11 is a perspective view of a closure drive mechanism of a second embodiment of the present invention mated with other components of the stapler;
FIG. 12 is a schematic view of a closure driving mechanism according to a second embodiment of the present invention;
Fig. 13 is a schematic view of the retainer of the second embodiment of the present invention mated with the first slider.
Reference numerals:
1. first compression spring of anastomat body 61
11. Second compression spring of fixed handle 62
12. Casing 7 spring
121. Fixed end of travel groove 71
13. Push-button portion of pull tab 72
2. Pull rope passing groove of shell 73
3. Fourth incline of movable handle 74
31. Jaw 75 movable end
4. A sixth incline of the connecting rod 76
51. First slider 8 actuating lever
511. First groove 81 advances the tooth
512. Second groove 82 rack
513. First inclined plane 83 firing member
514. Third inclined plane 831 inclined table surface
52. Second slider 84 flange
521. Boss 841 flange inclined plane
522. Second inclined plane 91 pull rope
53. Third slide block 92 pulley
531. Closing driving piece for accommodating groove 93
532. Third compression spring with top surface 94
535. Fifth inclined plane 95 connecting 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 different forms and should not be construed as limited to the embodiments set forth herein, but rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary 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.
In order to solve the technical problems in the prior art, the invention provides a closing driving mechanism for a medical anastomat and the medical anastomat comprising the nail bin. The anastomat comprises a nail head part and an anastomat body, wherein a closing pull piece for closing the nail head part is arranged in the anastomat body. The medical stapler comprises a medical stapler body, a closing driving mechanism and a closing driving mechanism, wherein the closing driving mechanism is used for the medical stapler body and comprises a movable handle, a first sliding block, a retaining piece, a steering assembly and a closing driving piece, the steering assembly is connected between the first sliding block and the closing driving piece, a groove is formed in the first sliding block, the first sliding block is located at the proximal end side of the retaining piece in an initial state, when the movable handle is held, the movable handle pushes the first sliding block to move towards the distal end side of the stapler body, the steering assembly converts the movement of the first sliding block towards the distal end side of the stapler body into the movement of the closing driving piece towards the proximal end side of the stapler body, the closing driving piece pulls the closing pulling piece to move towards the proximal end side of the stapler body, and at the moment, the retaining piece at least partially enters the groove of the first sliding block to block the movement of the first sliding block towards the proximal end side of the stapler body. When the operator checks the tissue to be anastomosed, after confirming that the anastomat can be fired, the state is switched to the triggerable state of the anastomat, and when the movable handle is held again, the anastomat can be fired, and as the first sliding block does not move to the proximal end side of the anastomat, the closing driving piece does not provide driving force for the closing pulling piece to the distal end side of the anastomat, and the closing of the head of the nail can be kept.
The structure of the closing drive mechanism and the medical stapler according to an embodiment of the present invention will be described with reference to fig. 1 to 13. Fig. 1 to 9 show the structure of a closure driving mechanism and a medical stapler according to a first embodiment of the present invention, and fig. 10 to 13 show the structure of a closure driving mechanism and a medical stapler according to a second embodiment of the present invention. Wherein the holder structure of the first embodiment is different from that of the second embodiment.
As shown in fig. 1 to 9, in a first embodiment of the present invention, the anastomat includes an anastomat body 1 and a nail head (not shown) located at a distal end side of the anastomat body 1, the anastomat body 1 includes a housing 2 and a fixed handle 11, a closing pull tab 13 for closing the nail head and opening the nail head is further provided in the interior of the anastomat body 1, and a sleeve 12 is sleeved on the exterior of the closing pull tab 13. The closing drive mechanism comprises a movable handle 3 rotatably connected to the anastomat body 1, a first sliding block 51 positioned in the anastomat body 1, a retaining member, a steering assembly, a firing member 83 and a closing drive member 93 connected with the closing pull tab 13, wherein the steering assembly is connected between the first sliding block 51 and the closing drive member 93, and a first groove 511 is formed in the first sliding block 51. When holding the movable handle 3, the movable handle 3 pushes the first slider 51 to move towards the distal direction of the anastomat, the steering assembly converts the movement of the first slider 51 towards the distal direction of the anastomat into the movement of the closing driving piece 93 towards the proximal direction of the anastomat, and the closing driving piece 93 pulls the closing pulling piece 13 towards the proximal direction of the anastomat so as to enable the nail head to be closed, and at the moment, the retainer at least partially enters the first groove 511 of the first slider 51 so as to block the movement of the first slider 51 towards the proximal direction of the anastomat. When switching to the cockable mode, holding the movable handle 3 again, the stapler can be cocked, and since the first slider 51 is blocked by the retainer, no movement to the proximal side of the stapler occurs, nor does the closure driving member 93 give a driving force to the closure tab 13 to the distal side of the stapler, the closure of the staple head can be maintained. For one part, the outside refers to the side away from the axis of the stapler and the inside refers to the side closer to the axis of the stapler.
In the present invention, the distal side and the proximal side are relative to the operator, wherein the distal side refers to the end farther from the operator and the proximal side refers to the end nearer to the operator. For example, in the view of fig. 1, the distal end side of the stapler body 1 is the left end in the drawing, and the right end of the stapler body 1 is the right end in the drawing. The axial direction of the medical stapler refers to a direction from the proximal side to the distal side of the medical stapler, i.e. the extending direction of the sleeve 12 in fig. 1.
In this embodiment, the steering assembly includes a steering support beam 92 and a pull cord 91, the steering support beam 92 being secured to the housing 2, and in a preferred embodiment, the steering support beam 92 being configured as a pulley 92 to reduce resistance to movement of the pull cord 91. The pulley 92 is located at the proximal end side of the first slider 51, the pull cord 91 is sleeved outside the pulley 92, and the pull cord 91 is connected between the first slider 51 and the closing driver 93. In a preferred embodiment, the two ends of the pull cord 91 are respectively provided with a fixed end. The proximal side of the first slider 51 may be provided with a second groove 512, and a fixed end of the pull cord 91 is detachably mounted in the second groove 512. The other fixed end of the pull cord 91 is detachably connected to the closure driving member 93. By the structure of the pull rope 91 and the pulley 92, the movement of the first slider 51 can be converted into reverse driving force to be transmitted to the closing driving member 93, so that the closing driving member 93 moves proximally.
In this embodiment, the closing driving element 93 is a sleeve sleeved outside the closing tab 13, and the closing driving element 93 is axially fixed to the closing tab 13, where axially fixing means that there is no relative movement between the closing driving element 93 and the closing tab 13 along the axial direction of the stapler, and if the closing driving element 93 moves along the axial direction to the proximal side or to the distal side of the stapler, the closing tab 13 is linked with the closing driving element 93. Further, the closing driving member 93 is sleeved outside the sleeve 12, a travel groove 121 extending along the axial direction of the anastomat is provided on the side surface of the sleeve 12, a connecting pin 95 is provided in the closing driving member 93, the connecting pin 95 is inserted into the travel groove 121, and the connecting pin 95 can move along the extending direction of the travel groove 121. The travel groove 121 communicates with the inner side and the outer side of the sleeve 12, and the connecting pin 95 is a through pin, and the closing driving member 93 is fixedly connected with the closing tab 13 through the connecting pin 95, and simultaneously, a guiding function is provided for the axial movement of the closing driving member 93 through the movement of the connecting pin 95 in the travel groove 12 of the sleeve 12. The closing drive 93 is fixed circumferentially to the sleeve 12 by a connecting pin 95, i.e. the closing drive 93 is rotatable with rotation of the sleeve 12 about its axis.
The proximal side of the closure drive member 93 is provided with a biasing member which biases the closure drive member 93 in a direction towards the distal side of the stapler. In this embodiment, the biasing member is a third compression spring 94, when the movable handle 3 is held to close the stapling head, the closing driving member 93 moves to the proximal end side of the stapler to press the third compression spring 94, and when the stapler is reset after firing is completed, the deformation restoring force of the third compression spring 94 can push the closing driving member 93 to move to the distal end side of the stapler to return to the initial position, and the stapling head can be opened.
In this embodiment, the movable handle 3 is connected to a link 4, and when the movable handle 3 is held, the distal end side of the link 4 pushes the first slider 51 to move in the distal end side direction of the stapler.
As shown in fig. 2, the closure drive mechanism further comprises an actuation lever 8 for firing the stapler. The distal end side of the actuating rod 8 is provided with a pushing tooth 81, the proximal end side of the pushing tooth 81 is provided with a rack 82, the distal end side of the actuating rod 8 is movably connected with a firing member 83, the firing member 83 can rotate 360 degrees relative to other parts of the actuating rod 8, the firing member 83 is sleeved and fixedly connected with the sleeve 12, and an inclined table top 831 is circumferentially arranged on the distal end side of the firing member 83. The movable handle 3 is also provided with a claw 31. When the movable handle 3 is held for the first time, the claw 31 of the movable handle 3 pushes the pushing teeth 81 of the actuating lever 8 so that the actuating lever 8 moves toward the distal side of the stapler, and the inclined surface 831 of the firing member 83 gradually approaches and contacts the holding member and presses the holding member downward so that the holding member at least partially enters the first groove 511 of the first slider 51. At this time, the claw 31 is located at a position corresponding to the rack 82, and is switched to the cocking mode, and when the movable handle 3 is held again, the claw 31 pushes the rack 82 of the actuating lever 8, so that the actuating lever 8 continues to move in the distal direction of the stapler, and the actuating lever 8 pushes the firing piece 83 on the distal side of the actuating lever 8, so as to fire the stapler.
As shown in fig. 4 to 7, in this embodiment, the holding member includes a second slider 52, one side of the second slider 52 is provided with a boss 521, when the movable handle 3 is held, the firing member moves to the distal side above the holding member, and presses the holding member downward, and at the same time, the first slider 51 moves to the distal side, at least part of the lower portion of the boss 521, so that the boss 521 enters the first recess 511 of the first slider 51. Further, the holder further includes a third slider 53, and the third slider 53 is provided with a receiving groove 531 for receiving the second slider 52. The accommodating groove 531 is provided with a first biasing member, and the first biasing member biases the second slider 52 downward. A second biasing member is provided below the third slider 53, and the second biasing member biases the third slider 53 upward. In this embodiment, the first biasing member is a first compression spring 61 and the second biasing member is a second compression spring 62. Specifically, a first biasing member hole is formed in a side, close to the first biasing member, of the second sliding block 52, one end of the first biasing member is disposed in the first biasing member hole, a second biasing member hole is formed in a side, close to the second biasing member, of the third sliding block 53, and one end of the second biasing member is disposed in the second biasing member hole, so that the second sliding block 52 and the third sliding block 53 move in a direction perpendicular to the axial direction.
As shown in fig. 6 and 7, a schematic view of the boss 521 entering the first recess 511 is shown. When the movable handle 3 is held for the first time, the actuating lever 8 and the first slider 51 are both moved in the distal side direction of the stapler, and the first groove 511 of the first slider 51 is moved to below the boss 521. The firing bar 83 presses the third slider 53 downward and presses the second compression spring 62, and the third slider 53 moves downward, and the first compression spring is compressed when the first slider 51 lifts up the second slider 52. After the boss 521 of the second slider 52 moves downward into the first groove 511, the second slider 52 is held in the first groove 511 by the first compression spring 61. When the anastomat is reset after the firing is finished, the actuating rod 8 moves to the proximal end side of the anastomat to return to the initial position, the third sliding block 53 is not pressed by the firing part 83 any more, the third sliding block 53 and the second sliding block 52 return to the initial position under the action of the deformation restoring force of the first pressure spring 61 and the second pressure spring 62, the closing driving part 93 moves to the distal end side under the action of the third pressure spring, and the first sliding block 51 is driven to move to the proximal end side of the anastomat to return to the initial position through the pull rope 91.
In this embodiment, one side of the actuating lever 8 may be further provided with a flange 84, and when the movable handle 3 is held, the flange 84 moves toward the distal end side of the stapler to contact the top surface 532 of the third slider 53 and presses the third slider 53 downward so that the boss 521 of the second slider 52 enters the first groove 511 of the first slider 51. The flange 84 urging the third slider 53 and the firing member 83 urging the third slider 53 described above can be used as two alternative embodiments. In a proximal side view of the stapler, the flange 84 and the boss 521 of the second slider 52 are located on either side of the actuating lever 8. That is, as shown in fig. 3, the flange 84 is located on the right side of the actuating lever 8 and the boss 521 is located on the left side of the actuating lever 8 from the right end face in the axial direction. As shown in fig. 9, the lower end surface of the flange 84 is also provided with a flange inclined surface 841 which cooperates with the fifth inclined surface 535 to guide with each other between the third slider 53, corresponding to the fifth inclined surface 535 of the third slider 53.
In this embodiment, the distal side of the first slider 51 is a first inclined surface 513, the first inclined surface 513 is inclined upward from the distal side to the proximal side thereof, and the proximal side of the boss 521 is a second inclined surface 522 that mates with the first inclined surface 513. The cooperation of the first and second sloped surfaces 513, 522 may better guide the boss 521 into the first slider 51.
In this embodiment, the proximal side of the first groove 511 is a third inclined surface 514 that mates with the second inclined surface 522, and the distal side of the first groove 511 and the distal side of the boss 521 are both vertical surfaces. I.e., the first groove 511 is a structure adapted to the shape of the boss 521. And, by the cooperation of the two perpendicular surfaces of the distal side surface of the first groove 511 and the distal side surface of the boss 521, the boss 521 is blocked from being detached from the distal side of the first slider 51 when the boss 521 is located in the first groove 511.
Fig. 10 to 13 are schematic structural views of a closing driving mechanism and a stapler according to a second embodiment of the present invention. This embodiment differs from the first embodiment in that the structure of the holder is different. In this embodiment, the holding member includes a spring 7, the spring 7 includes a fixed end 71, a pressing portion 72 and a movable end 75, the fixed end 71 is fixed on the stapler, when the movable handle 3 is held for the first time, the firing member 83 moves toward the distal end of the stapler, the firing member 83 presses the pressing portion 72 downward, the movable end 75 moves downward into the first recess 511 of the first slider 51, and the spring 7 deforms to block the movement of the first slider 51 toward the proximal end of the stapler. After the completion of the firing of the stapler, the actuating lever 8 is moved back to the initial position in the proximal direction of the stapler, and the firing member 83 no longer presses the pressing portion 72, and the movable end 75 moves upward to be separated from the first recess 511 by the deformation restoring force of the elastic piece 7, so that the first slider 51 can be moved back to the initial position in the proximal direction of the stapler.
The elastic sheet 7 is also provided with a pull rope penetrating groove 73 at the position matched with the pull rope 91, and the pull rope 91 can penetrate through the pull rope penetrating groove 73 and axially move in the pull rope penetrating groove 73.
In this embodiment, the fixed end 71 of the elastic piece 7 is located at the distal end side of the movable end 75, and the movable end 75 is bent downward and toward the distal end side of the stapler to form an engaging portion that engages with the first groove 511 of the first slider 51. The distal side of the first slider 51 is a first inclined surface 513, the first inclined surface 513 is inclined upward from the distal side to the proximal side thereof, and the proximal side of the engaging portion is a fourth inclined surface 74 engaging with the first inclined surface 513. The engagement of the first inclined surface 513 and the fourth inclined surface 74 can better guide the engagement portion of the elastic piece 7 into the first groove 511. Corresponding to the inclined surface 831 of the firing member 83, a sixth inclined surface 76 is also formed on the proximal end side of the spring 7, and the sixth inclined surface 76 and the inclined surface 831 of the firing member 83 are mutually guided. This embodiment may also cooperate with the flange 84 shown in fig. 9, i.e. the flange ramp 841 and the sixth ramp 76 are mutually guided.
In this embodiment, the proximal side of the first groove 511 is a third inclined surface that mates with the fourth inclined surface 74, the distal side of the first groove 511 is a vertical surface, and the movable end 74 of the spring 7 is formed with a vertical surface that mates with the distal side of the first groove 511. By the cooperation of the two perpendicular surfaces of the movable end 74 of the elastic piece 7 and the distal side surface of the first groove 511, the movable end 74 can be prevented from coming off the distal side of the first groove 511 when the movable end 74 enters the first groove 511.
The closing driving mechanism and the medical anastomat comprising the same provided by the invention have the following advantages:
the invention provides a closing driving mechanism for a medical anastomat, which limits the position of the closing driving mechanism when a nail head is closed through a retainer, and prevents a closing pulling piece from moving towards the distal side direction of the anastomat when the anastomat is triggered, thereby ensuring the closing stability of the nail head in the triggering process of the anastomat and improving the operation effect.
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.