CN210990512U

CN210990512U - Closing driving mechanism and medical anastomat comprising same

Info

Publication number: CN210990512U
Application number: CN201921425349.4U
Authority: CN
Inventors: 单腾
Original assignee: Suzhou Tianchen International Medical Technology Co Ltd
Current assignee: Touchstone International Medical Science Co Ltd; Suzhou Tianchen International Medical Technology Co Ltd
Priority date: 2019-08-29
Filing date: 2019-08-29
Publication date: 2020-07-14
Anticipated expiration: 2029-08-29

Abstract

The utility model provides a closed actuating mechanism reaches medical anastomat including it, closed actuating mechanism is including activity handle, first slider, keeper, closed driving piece and actuating lever, the initial position of the at least partial structure of first slider is located the near-end side of keeper, the actuating lever is provided with presses the splenium and the portion of stepping down, the initial position of pressing the splenium and the portion of stepping down of actuating lever all is located the near-end side of keeper when holding movable handle under initial condition, first slider to distal end side motion and with the keeper gomphosis, after the anastomat percussion is accomplished, the keeper breaks away from with first slider is automatic. The utility model discloses a position of closed driving piece when the gomphosis of holder and first slider is closed to the pin fin is injectd, closed pulling-on piece moves to the distal end side direction of anastomat when avoiding the anastomat percussion to after the anastomat percussion is accomplished, the holder no longer restricts the position of closed driving piece, and nail storehouse and nail anvil can be opened automatically.

Description

Closing driving mechanism and medical anastomat comprising same

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to closed actuating mechanism reaches medical anastomat including it.

Background

Digestive tract diseases are one of the high-incidence diseases of human beings, and in the treatment process, a medical anastomat is often used for performing anastomosis on physiological tissues such as the digestive tract and the like instead of manual operation of a doctor. The medical anastomat is a common surgical operation instrument, an axial internal stapling mode is mostly adopted, physiological tissues such as esophagus, stomach and intestinal tract are anastomosed end to end or end to side in an operation, two sections of tissues are contained in the medical anastomat in an inwards converging mode in an anastomosing process, a circular anastomotic stoma is formed on the tissues after the completion of the anastomosis, and a human body channel is rebuilt.

In the prior art, a medical stapler includes a medical stapler body, an operating handle movably connected to the medical stapler body, and a staple head portion engaged with the medical stapler body. The nail head comprises a nail bin and a nail anvil which are oppositely arranged. During operation, the movable handle is held firstly, the closing pull piece of the nail head part is pulled by the closing driving mechanism to move towards the near end side of the anastomat, so that after the nail bin and the nail anvil are closed, the operating handle is held again, the anastomosis nails can be pushed to move towards tissues, the tissues are anastomosed by forming the anastomosis nails in the nail bin at the nail anvil assembly, and meanwhile, the cutter moves from the near end side to the far end side of the anastomat to cut the tissues. The utility model discloses in, distal end side and near-end side are for the operator, and the one end that is nearer apart from the operator is near-end side, and the one end far away apart from the operator, the one end that is more close to the operation position promptly 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 pull sheet may be displaced towards the direction of the far end side 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. In addition, in the existing closing driving mechanism, after the stapler is fired, the nail bin and the nail anvil are still closed, and after a doctor operates the stapler, an additional operation step is required for opening the nail bin and the nail anvil. And after the anastomat is fired, a doctor needs to pull back the push cutter rod, so that the cutter returns to the initial position along the cutter groove, and in the process of pulling back the cutter, if the nail bin and the nail anvil are still closed, the cutter can be subjected to the resistance of the tissue between the nail bin and the nail anvil and cannot smoothly return to the initial position.

SUMMERY OF THE UTILITY MODEL

To the problem among the prior art, an object of the utility model is to provide a closed actuating mechanism and medical anastomat including it, the position of closed driving piece when the gomphosis through holder and first slider is closed the pin fin portion is injectd, closed pulling-on piece is to the distal end side direction motion of anastomat when avoiding the anastomat percussion to after the anastomat percussion is accomplished, the holder no longer restricts the position of closed driving piece, and nail storehouse and nail anvil can open automatically.

The embodiment of the utility model provides a closing drive mechanism for medical anastomat, closing drive mechanism includes activity handle, first slider, keeper, closure driving piece and actuating lever, the initial position of the at least partial structure of first slider is located the near-end side of keeper, the actuating lever is provided with the splenium and abdication portion, the splenium of actuating lever and the initial position of abdication portion all are located the near-end side of keeper;

when the movable handle is held in an initial state, under the action of the movable handle, the first sliding block moves to the direction of the far end side of the anastomat to the position below the holding piece, the closing driving piece is driven to close the nail head part of the anastomat, the pressing part of the actuating rod moves to the direction of the far end side of the anastomat and presses the holding piece downwards, and the holding piece is embedded with the first sliding block;

when the anastomat is completely fired, the abdicating part of the actuating rod moves to the position above the retaining piece, the retaining piece moves upwards to at least partially enter the abdicating part, and the retaining piece is separated from the first sliding block.

Optionally, the upper surface of the first slider is provided with a groove, the groove is located on the proximal end side of the holding member in the initial position, and the holding member at least partially enters the groove of the first slider when the movable handle is held in the initial state; or

The holder is provided with an upwardly recessed groove, and the first slider at least partially enters the groove of the holder when the movable handle is held in an initial state.

Optionally, the pressing portion of the actuating lever is a flange provided at a distal end side of the actuating lever, and the relief portion is recessed upward with respect to the flange.

Optionally, the distal side of the flange is a flange first inclined surface inclined upward from the proximal side edge to the distal side edge thereof, and the proximal side of the holder is a holder first inclined surface cooperating with the flange first inclined surface.

Optionally, the relief is a relief groove formed in the flange.

Optionally, the distal side of the abdicating groove is a flange second inclined surface inclined upward from the distal side to the proximal side thereof, and the distal side of the holder is a holder second inclined surface engaged with the flange second inclined surface.

Optionally, the relief is formed between a proximal side of the flange and the actuating lever.

Optionally, the proximal side of the flange is a flange second inclined surface inclined upward from the distal side edge to the proximal side edge thereof, and the distal side of the holder is a holder second inclined surface cooperating with the flange second inclined surface.

Optionally, a groove is formed in the upper surface of the first slider, the holder includes a second slider and a third slider, an accommodating groove for accommodating the second slider is formed in the third slider, a boss is formed on one side of the second slider, and when the movable handle is held in an initial state, the boss of the second slider moves downward and at least partially enters the groove of the first slider.

Optionally, a first biasing member is disposed below the third slider, and the first biasing member biases the third slider upwards.

Optionally, the upper surface of the first slider is provided with a groove, the retaining member includes a resilient piece, the resilient piece includes a fixed end and a movable end, the fixed end of the resilient piece is located on the distal end side of the movable end, the movable end forms a matching portion matched with the groove of the first slider, and when the pressing portion of the actuating lever presses the resilient piece downwards, the matching portion at least partially enters the groove of the first slider.

The embodiment of the utility model provides a medical anastomat is still provided, include closed actuating mechanism.

The utility model provides a closed actuating mechanism reaches medical anastomat including it has following advantage:

the utility model provides a closed actuating mechanism for medical anastomat, before the anastomat percussion, after through closed driving piece pulling pin nose closure, the gomphosis through keeper and first slider is injectd the position of closed driving piece, closed pulling-on piece is to the distal end side direction motion of anastomat when avoiding the anastomat percussion, and after the anastomat percussion is accomplished, keeper upward movement and break away from first slider, no longer restrict the position of closed driving piece, the initial position can be returned to closed driving piece, thereby make nail storehouse and nail anvil can open automatically, reduce the operating procedure of doctor to the anastomat, and can very smoothly pull back the cutter.

Drawings

Other features, objects and advantages of the invention will become more apparent from a reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.

Fig. 1 is a partial structural schematic view of an anastomat in an initial state according to a first embodiment of the invention;

FIG. 2 is a schematic view of the stapler of FIG. 1 with the stapler housing removed;

fig. 3 is a schematic view of the position of the first slider and the holder in the initial state of the first embodiment of the present invention;

fig. 4 is a schematic structural view of the closing drive mechanism in the initial state according to the first embodiment of the present invention;

FIG. 5 is an enlarged view taken at A1 in FIG. 4;

fig. 6 is a partial structural view of the stapler holding the movable handle once in the initial state according to the first embodiment of the present invention;

fig. 7 is a schematic structural view of the closing drive mechanism after holding the movable handle once in the initial state according to the first embodiment of the present invention;

FIG. 8 is an enlarged view taken at A2 in FIG. 7;

fig. 9 is a schematic view showing the engagement between the first slider and the holder after the movable handle is held once in the initial state according to the first embodiment of the present invention;

fig. 10 is a schematic structural view of a holder according to a first embodiment of the present invention;

FIG. 11 is a schematic view of a portion of the stapler with the first embodiment of the present invention;

FIG. 12 is a schematic view of the closure driving mechanism of the stapler with the first embodiment of the present invention;

FIG. 13 is an enlarged view at A3 of FIG. 12;

FIG. 14 is a schematic view of the first slide and retainer position at the completion of the firing of the stapler according to the first embodiment of the present invention;

figure 15 is a schematic structural view of a closure drive mechanism according to a second embodiment of the present invention;

fig. 16 is a schematic view of the position of the first slider and the holder according to the second embodiment of the present invention.

Reference numerals:

1 stapler body 6 second slide block

11 fixed handle 61 boss

12 pull tab 62 second slider ramp

13 second stop surface of housing 63

2 actuating lever 7 third slide

21 pusher tooth 71 receiving slot

22 rack 72 third slide first slope

23 flange 73 third slider second incline

24 flange first ramp 74 first compression spring

25 second compression spring with second inclined surface 75

26 groove 81 stay cord of stepping down

27 firing member 82 steering support beam

3 Movable handle 83 closing drive

31 jaw 84 third compression spring

4 connecting rod 9 spring plate

5 first slider 91 fixed end

51 first recess 92 free end

52 second groove 93 draw cord passing through groove

53 first slider first inclined plane 94 spring first inclined plane

54 first slider second inclined plane 95 second inclined plane of elastic sheet

55 first stop surface 96 elastic sheet third inclined surface

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different 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 example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.

In order to solve the technical problem in the prior art, the utility model provides a medical anastomat that is used for the closed actuating mechanism of medical anastomat and includes this nail storehouse. The anastomat comprises a nail head and an anastomat body, wherein a closing pull piece used for closing the nail head is arranged in the anastomat body. The closing driving mechanism is used for the medical anastomat and comprises a movable handle, a first sliding block, a retaining piece, a closing driving piece and an actuating rod, the initial position of the first sliding block is located on the proximal end side of the retaining piece, the actuating rod is provided with a pressing portion and a yielding portion, and the initial positions of the pressing portion and the yielding portion of the actuating rod are located on the proximal end side of the retaining piece. When the movable handle is held in an initial state, under the action of the movable handle, the first sliding block moves to the direction of the far end side of the anastomat to the position below the holding piece, the closing driving piece is driven to close the nail head of the anastomat by pulling the closing pull piece of the anastomat, similarly, under the action of the movable handle, the pressing part of the actuating rod moves to the direction of the far end side of the anastomat and presses the holding piece downwards, the holding piece is embedded with the first sliding block to limit the movement of the first sliding block to the near end side of the anastomat, the closing pull piece cannot move to the direction of the far end side of the anastomat in the percussion process of the anastomat, and the stability of closing the nail head is guaranteed.

When the anastomat is fired, the yielding part moves to the upper side of the retaining part along with the actuating rod to the far end side, the retaining part moves upwards and at least partially enters the yielding part, so that the retaining part is separated from the first sliding block, the position of the closing driving part is not limited any more, the closing driving part can return to the initial position, the closing pulling piece is driven to move towards the far end side of the anastomat, the nail bin and the nail anvil can be automatically opened, the operation steps of a doctor on the anastomat are reduced, and the cutter can be pulled back very smoothly.

The utility model discloses still provide one kind and include closed actuating mechanism's medical anastomat through the closed actuating mechanism who adopts this kind of structure, can guarantee the closed stability of anastomat percussion in-process pin fin portion, and after the anastomat percussion is accomplished, the pin fin portion can be opened automatically.

The structure of the closing driving mechanism and the stapler according to the embodiment of the present invention will be described in detail with reference to fig. 1 to 16. Fig. 1 to 14 show the structure of a closing drive mechanism and an anastomat according to a first embodiment of the present invention, and fig. 15 and 16 show the structure of a closing drive mechanism and an anastomat according to a second embodiment of the present invention. Wherein the holder structure of the first and second embodiments is different. It is understood that the specific configurations of the two embodiments herein are merely illustrative of specific embodiments of the present invention, and are not to be construed as limiting the scope of the invention.

As shown in fig. 1-14, in the first embodiment of the present invention, the anastomat includes anastomat body 1 and the nail head (not shown in the figure) that is located the distal end side of anastomat body 1, anastomat body 1 includes casing 13 and fixed handle 11, the inside of anastomat body 1 still is provided with the closed pulling-on piece 12 that is used for closed nail head and opens the nail head, closed pulling-on piece 12 is when initial condition, the nail head is opened, when closed pulling-on piece 12 moves to the anastomat near-end side, the nail head is closed, when closed pulling-on piece 12 moves to the anastomat distal end side again, the nail head can be reopened. The closing driving mechanism comprises a movable handle 3, a first sliding block 5, a retaining piece, a closing driving piece 83 and an actuating rod 2, wherein the closing driving piece 83 is connected with a closing pulling piece 12, and when the closing driving piece 83 moves towards the proximal end side of the anastomat, the closing pulling piece 12 is pulled to move towards the proximal end side of the anastomat so as to close the nail head of the anastomat.

Fig. 1-5 show the structure of the stapler and the closure driving structure in the initial state in this embodiment. In this embodiment, in the initial state, the first slider 5 and the actuating lever 2 are both located at initial positions, the initial position of the first slider 5 is located on the proximal end side of the holder, the actuating lever 2 is provided with a pressing portion, and the initial position of the pressing portion of the actuating lever 2 is located on the proximal end side of the holder. As shown in fig. 3, the holder includes a second slider 6 and a third slider 7, and the third slider 7 is provided with an accommodating groove 71 for accommodating the second slider 6. As shown in fig. 4 and 5, the pressing portion of the actuating lever 2 is a flange 23 provided on the distal end side of the actuating lever 2.

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 closer to the operator. The upward or upward direction is relative to the actuating lever, towards the side facing away from the rack 22, and the downward or downward direction is opposite thereto. For example, in the perspective views of fig. 1 and 2, the distal end side of the stapler body 1 is the left end in the drawing, the proximal end side of the stapler body 1 is the right end in the drawing, and the upward direction refers to the upper end in the drawing. Whereas in the perspective of fig. 4, the distal side of the actuating rod 2 in fig. 4 is the right side of the actuating rod 2 in fig. 4 and the proximal side of the actuating rod 2 is the left side of the actuating rod 2 in fig. 4, since the view is reversed with respect to the perspective of fig. 1 and 2.

When the movable handle 3 is held in the initial state, the rotating motion of the movable handle 3 drives the connecting rod 4 to move towards the distal side direction of the anastomat, and further the connecting rod 4 pushes the first sliding block 5 to move towards the distal side direction of the anastomat to the lower part of the holding part. The first slider 5 is connected with the closing driving member 83 through a turning member, and the turning member converts the movement of the first slider 5 toward the distal side of the stapler into the movement of the closing driving member 83 toward the proximal side of the stapler, and further pulls the pull tab 12 toward the proximal side of the stapler, thereby closing the head of the stapler.

In this embodiment, the steering assembly includes a steering support beam 82 and a pull rope 81, the steering support beam 82 is fixedly arranged on the housing 13, and in a preferred embodiment, the steering support beam 82 is provided as a pulley 82 to reduce resistance when the pull rope 81 moves. The pulley 82 is located at a proximal end side of the first slider 5, the pulling rope 81 is sleeved outside the pulley 82, and the pulling rope 81 is connected between the first slider 5 and the closing driving member 93. In a preferred embodiment, the two ends of the pulling rope 81 are respectively provided with a fixing end. The proximal end side of the first slider 5 may be provided with a second recess 52, and a fixed end of the pulling rope 81 is detachably mounted in the second recess 52. The other fixed end of the pulling rope 81 is detachably connected to the closing driving member 93. By the configuration of the rope 81 and the pulley 82, the movement of the first slider 5 can be converted into a reverse driving force to be transmitted to the closing driving member 93, and the closing driving member 93 can be moved to the proximal side.

Meanwhile, when the movable handle 3 is held in the initial state, the movable handle 3 is held and rotated, the claw 31 on the movable handle 3 is contacted with the pushing tooth 21 on the actuating rod 2, and the pushing tooth 21 is pushed towards the distal direction of the anastomat, so that the actuating rod 2 is also moved towards the distal direction of the anastomat, the pressing part of the actuating rod 2 is moved towards the distal direction of the anastomat to be contacted with the holding part, and then the holding part is pressed downwards, and the holding part is embedded with the first sliding block 5 to block the movement of the first sliding block 5 towards the proximal side of the anastomat, so that the stability when the nail head is closed is maintained.

As shown in figures 6 to 10, the structure of the stapler and the closure driving mechanism is shown after the first grip of the movable handle 3. In this embodiment, the upper surface of the first slider 5 is provided with a first concave groove 51, and after the movable handle 3 is gripped in the initial state, the holder is fitted to the first slider 5 to maintain stability when the nail head is closed. Here, the engagement means that the holding element is at least partially configured to enter the first recess 51 of the first slider 5. In other alternative embodiments, the engagement between the retaining element and the first slider 5 may be: the holder is provided with an upwardly concave recess into which the first slider 5 at least partially enters when the movable handle 3 is held in an initial state.

As shown in fig. 8 to 10, a boss 61 is provided on one side of the second slider 6. In the initial position, the boss 61 is located on the distal end side of the first groove 51, and the boss 61 is higher than the first groove 51. When the movable handle 3 is held in an initial state, the first slider 5 moves towards the far end side, the first groove 51 of the first slider 5 comes under the boss 61, the flange 23 moves towards the far end side of the anastomat to be in contact with the upper end of the third slider 7, downward pressure is given to the third slider 7, and under the pressing action of the flange 23, the third slider 7 drives the second slider 6 to move downwards integrally, so that the boss 61 of the second slider 6 moves downwards and at least partially enters the first groove 51 of the first slider 5.

A first biasing member is disposed below the third slider 7, and the first biasing member biases the third slider 7 upward. In this embodiment, the first biasing member is a first compression spring 74. In the initial state, the third slider 7 is held at the initial position by the first compression spring 74, and when the flange 23 presses the third slider 7 downward, the third slider 7 moves downward and presses the first compression spring 74 to deform.

Further, a second biasing member is further disposed between the inner wall of the accommodating groove 71 and the upper surface of the second slider 6, and the second biasing member provides a downward biasing force to the second slider 6. In this embodiment, the second biasing member is a second compression spring 75. When the third slider 7 moves downwards and drives the second slider 6 to move downwards until the boss 61 enters the first groove 51 of the first slider 5, the second slider 6 has an upward movement tendency relative to the third slider 7, and presses the second pressure spring 75 upwards to deform.

As shown in fig. 8, the distal side surface of the flange 23 is a flange first inclined surface 24 inclined upward from the proximal side edge to the distal side edge thereof, and the proximal side surface of the third slider 7 is a third slider first inclined surface 72 that cooperates with the flange first inclined surface 24. By the guiding interaction of the first inclined surface 24 of the flange and the first inclined surface 72 of the third slider, the flange 23 can contact and press the third slider 7 more smoothly when moving to the distal side of the stapler.

As shown in fig. 9 and 10, the distal end side surface of the first slider 5 is a first slider first inclined surface 53 inclined upward from the distal end side edge to the proximal end side edge thereof, the first slider first inclined surface 53 is an inclined surface inclined downward from the proximal end side edge to the distal end side edge thereof, and the proximal end side surface of the boss 61 of the second slider 6 is a second slider inclined surface 62 engaged with the first slider first inclined surface 53. The projection 61 of the second slider 6 can be better guided into the first recess 51 of the first slider 5 by the interaction of the first slider first ramp 53 and the second slider ramp 62. Further, the first recess 51 has a shape corresponding to the shape of the first projection 61, and the proximal side of the first recess 51 is a first slider second slope 54 that slopes upward from the distal side to the proximal side thereof.

The distal end side of the first groove 51 of the first slider 5 is formed as a first stop surface 55, and correspondingly, the distal end side of the boss 61 of the second slider 6 is formed as a second stop surface 63, and the first stop surface 55 and the second stop surface 63 are both vertical surfaces. In the initial position, the first stop surface 55 is spaced apart from the second stop surface 63. When the boss 61 is located in the first groove 51, the first slider 5 is blocked from moving to the proximal side by the engagement of the two vertical surfaces of the first stop surface 55 and the second stop surface 63.

After closing the nail head, when the movable handle 3 is held again in the state of the stapler shown in fig. 6 to 10, the movable handle 3 is held and rotated, the claws 31 of the movable handle are in contact with the rack 22, and the movable handle 2 is further pushed to move towards the distal direction of the stapler by pushing the rack 22, the movable handle 2 is provided with a firing member 27, and the firing member 27 can fire the stapler during the movement towards the distal direction of the stapler, so that the stapler can be anastomosed and cut tissues. During the firing of the stapler, the boss 61 of the second slider 6 is always kept in the first recess 51 of the first slider 5 by the pressing action of the flange 23, so that the stability of closing the nail head during the firing of the stapler is maintained.

At the completion of the stapler firing, if it is desired to open the staple head, so that the cartridge and the anvil are separated, it is necessary to disengage the retainer from the first slider 5, i.e. in this embodiment, the boss 61 of the second slider 6 from the first recess 51 of the first slider 5.

In this embodiment, the actuating rod 2 is further provided with a relief portion, and when the stapler is fired, the relief portion moves above the holding member, the holding member moves upward and at least partially enters the relief portion, the holding member is disengaged from the first slider 5, so that the first slider 5 can move in the proximal direction of the stapler, and the closure pull-tab 12 can move in the distal direction of the stapler to automatically open the head.

11-14 illustrate the configuration of the stapler and closure drive mechanism upon completion of firing the stapler in this embodiment. In this embodiment, the relieving portion is an upwardly concave relieving groove 26 formed at the proximal end of the flange 23, that is, an upwardly concave groove is formed in the flange 23 to relieve the upward movement of the third slider 7. In this embodiment, during the percussion of the stapler, the first compression spring 74 is deformed by the third slider 7, and when the percussion of the stapler is completed, because the flange 23 no longer presses the third slider 7, under the action of the deformation restoring force of the first compression spring 74, the third slider 7 moves upward, and then the boss 61 of the second slider 6 is driven to move upward to be separated from the first groove 51 of the first slider 5.

In this embodiment, the distal side surface of the receding groove 26 is a flange second inclined surface 25 inclined upward from the distal side edge to the proximal side edge thereof, and the distal side surface of the third slider 7 is a third slider second inclined surface 73 cooperating with the flange second inclined surface 25. Through the guiding function of the second inclined surface 25 of the flange and the second inclined surface 73 of the third slider, the third slider 7 can be more smoothly separated from the pressing function of the flange 23 and enter the abdicating groove 26 when the trigger of the anastomat is completed. In other alternative embodiments, at the completion of the stapling, the flange second inclined surface 25 of the flange 23 may still have a certain pressing effect on the third slider second inclined surface 73, that is, the pressing force of the pressing portion on the holding member is reduced but not zero, as long as the upward movement stroke of the third slider 7 is enough to disengage the first projection 61 of the second slider 6 from the first groove 51 of the first slider 5.

In other alternative embodiments, the length of the flange 23 is set according to the stroke of the actuation rod 2 during the firing of the stapler. The relief is formed between the end of the proximal side of the flange 23 and the actuating rod 2, that is, when the stapler is completely fired, the flange 23 moves to the distal side of the third slider 7, the third slider 7 is not pressed by the flange 23, and the third slider 7 moves upward until the boss 61 of the second slider 6 is disengaged from the first recess 51 of the first slider 5. In this embodiment, the proximal side of the flange 23 is a flange second inclined surface 25 inclined upward from the distal side to the proximal side thereof to guide the third slider second inclined surface 73.

Fig. 15 and 16 are schematic structural views of a closing drive mechanism according to a second embodiment of the present invention. In this embodiment, the upper surface of the first slider 5 is provided with a first groove 51, the holding member includes a spring 9, the spring 9 includes a fixed end 91 and a movable end 92, the fixed end 91 of the spring 9 is located at a distal end side of the movable end 92, the fixed end 91 is fixed to the housing 13 of the stapler, and the movable end 92 is bent downward and toward the distal end side to form a matching portion matching with the first groove 51 of the first slider 5.

In an initial state, the first slider 5 and the pressing portion of the actuating lever 2 are both located at the proximal end side of the elastic sheet 9, and when the movable handle 3 is held in the initial state, the movable handle 3 drives the first slider 5 to move to the direction of the distal end side of the stapler to the position below the matching portion of the elastic sheet 9, so that the pressing portion of the actuating lever 2 moves to the distal end side and contacts with the elastic sheet 9, and then presses the elastic sheet 9 downwards, so that the matching portion at least partially enters the first groove 51 of the first slider 5. The elastic sheet 9 may be made of a thin metal sheet, and when the engaging portion of the elastic sheet 9 is pressed down, the elastic sheet 9 itself is elastically deformed.

When the anastomat is fired, at least part of the matching part of the elastic sheet 9 enters the yielding part of the actuating rod 2, so that the pressure of the pressing part of the actuating rod 2 on the elastic sheet 9 is reduced or even eliminated, the elastic sheet 9 bounces upwards under the action of the restoring force of elastic deformation to enable the matching part to be separated from the first groove 51 of the first sliding block 5, and the nail head can be automatically opened.

In this embodiment, as shown in fig. 15 and 16, a pull rope passing groove 93 for passing the pull rope 81 is formed in the elastic sheet 9, and a proximal end side surface of an upper end of the elastic sheet 9 is formed as an elastic sheet first inclined surface 94 to better guide the pressing portion to press the upper end of the elastic sheet 9 when the pressing portion of the actuating lever 2 contacts with the elastic sheet 9 and to continue to move to a distal end side, and a distal end side surface of the upper end of the elastic sheet 9 is formed as an elastic sheet second inclined surface 95 to better guide the pressing portion to be separated from the elastic sheet 9 when the stapler is completely fired. The proximal end face of the lower end of the spring 9 is formed as a spring third ramp 96 to better guide the mating portion of the spring 9 into the first recess 51 of the first slider 5 when closing the head. The movable end 92 of the elastic sheet 9 is formed with a vertical surface which is matched with the far end side surface of the first groove 51, so as to better keep the elastic sheet 9 from being accidentally separated in the first groove 51.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. A closing driving mechanism is characterized by being used for a medical anastomat and comprising a movable handle, a first sliding block, a retaining piece, a closing driving piece and an actuating rod, wherein the initial position of at least part of the structure of the first sliding block is positioned on the proximal end side of the retaining piece, the actuating rod is provided with a pressing part and a yielding part, and the initial positions of the pressing part and the yielding part of the actuating rod are positioned on the proximal end side of the retaining piece;

2. The closure drive mechanism of claim 1, wherein the upper surface of the first slider is provided with a recess, the recess being located on a proximal side of the retainer in an initial position, the retainer at least partially entering the recess of the first slider when the movable handle is gripped in an initial state; or

3. The closure drive mechanism of claim 1, wherein the pressing portion of the actuation lever is a flange disposed on a distal side of the actuation lever, the relief being upwardly recessed relative to the flange.

4. The closure drive mechanism of claim 3, wherein the distal side of the flange is a flange first ramp that slopes upward from the proximal side edge to the distal side edge of the flange, and the proximal side of the retainer is a retainer first ramp that mates with the flange first ramp.

5. The closure drive mechanism of claim 3, wherein the relief is a relief groove formed in the flange.

6. The closure drive mechanism of claim 5, wherein the distal side of the relief groove is a flange second ramp that slopes upward from the distal side to the proximal side thereof, and the distal side of the retainer is a retainer second ramp that mates with the flange second ramp.

7. The closure drive mechanism of claim 3, wherein the relief is formed between a proximal side of the flange and the actuation rod.

8. The closure drive mechanism of claim 7, wherein the proximal side of the flange is a flange second ramp that slopes upward from the distal side to the proximal side of the flange, and the distal side of the retainer is a retainer second ramp that mates with the flange second ramp.

9. The closure actuating mechanism of claim 1, wherein the upper surface of the first slider is provided with a groove, the retaining member includes a second slider and a third slider, the third slider is provided with an accommodating groove for accommodating the second slider, one side of the second slider is provided with a boss, and when the movable handle is held in an initial state, the boss of the second slider moves downward and at least partially enters the groove of the first slider.

10. The closure drive mechanism of claim 9, wherein a first biasing member is disposed below the third slider, the first biasing member biasing the third slider in an upward direction.

11. The closure actuating mechanism of claim 1, wherein the upper surface of the first slider has a groove, the retaining member includes a resilient plate, the resilient plate includes a fixed end and a movable end, the fixed end of the resilient plate is located at a distal end of the movable end, the movable end forms a mating portion that mates with the groove of the first slider, and the mating portion at least partially enters the groove of the first slider when the pressing portion of the actuating lever presses the resilient plate downward.

12. A medical stapler, characterized in that it comprises a closure driving mechanism according to any one of claims 1 to 11.