CN112438766A - Closing driving mechanism and medical anastomat comprising same - Google Patents

Abstract

The invention provides a closing driving mechanism and a medical anastomat comprising the same, wherein the closing driving mechanism comprises a driving part and a cylinder body, the driving part is connected with a closing pull piece of the anastomat, the driving part is connected with the near end side of the cylinder body, a cavity part is formed in the cylinder body, and a one-way valve is arranged in the cavity part. When the nail head part is closed, the driving part moves towards the far end side of the anastomat to drive the axial length of the cylinder body to be shortened, the volume of the compression cavity part is reduced, the one-way valve is closed to prevent the air of the cavity part from being communicated with the external air, the air in the cavity part is compressed to form resistance to the movement of the driving part, the movement speed of the piston part is reduced, the nail bin and the nail anvil of the anastomat are separated slowly, and the situation that the surrounding tissues are injured due to overlarge opening force of the jaw is avoided.

Description

Closing driving mechanism and medical anastomat comprising same

Technical 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 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 firstly held, 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 assembly are closed, the operation handle is held again, the anastomosis nails can be pushed to move towards tissues, and the tissues are anastomosed by forming the anastomosis nails in the nail bin at the nail anvil assembly. After the anastomat is fired, the nail head needs to be opened, and the nail bin and the nail anvil need to be separated. However, in the existing stapler structure, after the stapler is fired, the staple cartridge and the anvil are suddenly separated quickly, and the suddenly opened jaws may damage other tissues.

In the present invention, the distal side and the proximal side are relative to the operator, and the end closer to the operator is the proximal side, and the end farther from the operator, i.e., the end closer to the surgical site is the distal side.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a closing driving mechanism and a medical anastomat comprising the same.

The embodiment of the invention provides a closing driving mechanism for a medical anastomat, which comprises a driving part and a cylinder body, wherein the driving part is connected with a closing pull sheet of the anastomat, the driving part is connected with the near end side of the cylinder body, a cavity part is formed in the cylinder body, and a one-way valve is arranged in the cavity part;

when the driving part moves towards the proximal end side of the anastomat, the driving part respectively drives the closing pull piece and the proximal end side of the cylinder body to move towards the proximal end side of the anastomat, the length of the cylinder body along the axial direction of the anastomat is extended, the volume of the cavity part is increased, and the one-way valve is opened;

when the driving part moves towards the far end side of the anastomat, the driving part drives the closing pull piece and the near end side of the cylinder body to move towards the far end side of the anastomat respectively, the length of the cylinder body in the axial direction of the anastomat is shortened, the volume of the cavity part is reduced, and the one-way valve is closed.

Optionally, the driving portion includes a first driving member and a second driving member connected to each other, the first driving member is connected to the closing pull tab, and the second driving member is connected to a proximal end side of the barrel.

Optionally, the driving part is at least partially located inside the cylinder, and the inner wall of the cylinder and the driving part enclose the cavity.

Optionally, the side wall of the cylinder is a flexible side wall, and in an initial state, the flexible side wall of the cylinder has a bending deformation amount, and the bending deformation amount of the flexible side wall is reduced when the driving part moves to the proximal end side of the anastomat.

Optionally, the side wall of the cylinder is an elastic side wall, and when the driving portion drives the proximal end side of the cylinder to move towards the proximal end side of the anastomat, the elastic side wall of the cylinder is pulled to elastically deform.

Optionally, the cylinder is a bellows extending in an axial direction of the stapler, the bellows has a compressive deformation amount in an initial state, and the compressive deformation amount of the bellows decreases when the driving portion moves to a proximal end side of the stapler.

Optionally, the mechanism further comprises a sleeve, the cylinder and the driving part are sleeved on the sleeve, and the driving part can move along the axial direction of the sleeve;

and a sealing element is arranged between the outer wall of the sleeve and the barrel.

Optionally, the one-way valve is provided at the distal side of the barrel.

Optionally, the cavity portion is further provided with an air hole communicated with air.

Optionally, the distal side of the barrel is secured to the housing of the stapler.

Optionally, the device further comprises a biasing member and a pulling rope, wherein the biasing member and the pulling rope are respectively connected with the driving part;

when the nail head part of the anastomat is driven to close, the pull rope pulls the driving part to move towards the proximal end side of the anastomat, and the biasing piece deforms;

when the nail head of the anastomat is driven to be opened, the driving part moves towards the far end side of the anastomat under the action of the deformation restoring force of the biasing piece.

Optionally, the closing driving mechanism further comprises a movable handle, a slider and a steering support beam, the pull rope is sleeved on the steering support beam, and two ends of the pull rope are respectively connected to the slider and the driving part;

in an initial state, when the movable handle is held, the movable handle drives the sliding block to move towards the far end side of the anastomat, and the sliding block pulls the driving part to move towards the near end side of the anastomat through the pull rope.

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

The closing driving mechanism and the medical anastomat comprising the same have the following advantages that:

the invention provides a closing driving mechanism for a medical anastomat, which is additionally provided with a cylinder body matched with a driving part, wherein the side wall of the cylinder body is made of flexible or elastic materials, the cylinder body can be extended or shortened under the driving of the driving part to cause the volume change of a cavity part in the cylinder body, and the opening and closing of a communication channel between the cavity part and the external air are controlled by a one-way valve; when the nail head part is driven to be closed, the side wall of the cylinder body extends along the axial direction to increase the volume of the cavity part, the one-way valve is opened to inflate the cavity part, and the driving part drives the pull piece to move towards the near end side of the anastomat so as to drive the nail head part to be closed; after the anastomat is fired, the side wall of the cylinder body is shortened along the axial direction to reduce the volume of the cavity, the one-way valve is closed, air in the cavity is compressed, the driving part is subjected to the resistance of the compressed air to slow down the movement to the far end side of the anastomat, so that the nail head can be slowly opened, and the phenomenon that the surrounding tissues are injured due to overlarge force for opening the jaw is avoided.

Drawings

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

FIG. 1 is a schematic view of a first embodiment of a closure actuation mechanism of the present invention in cooperation with a housing of a stapler;

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 cartridge of FIG. 2 with the cartridge removed;

FIG. 4 is a schematic structural view of the closure driving mechanism in an initial state of the first embodiment of the present invention;

FIG. 5 is a top plan view of the closure drive mechanism in an initial state of the first embodiment of the present invention;

FIG. 6 is a sectional view taken in the direction A1-A1 of FIG. 5;

FIG. 7 is a schematic structural view of the closure drive mechanism after closure of the stud in accordance with the first embodiment of the invention;

FIG. 8 is a top plan view of the closure drive mechanism after closure of the head of the first embodiment of the invention;

FIG. 9 is a sectional view taken in the direction A2-A2 of FIG. 8;

FIG. 10 is a schematic structural view of the closure drive mechanism after completion of firing of the stapler according to the first embodiment of the present invention;

FIG. 11 is a schematic view of the closure drive mechanism in an initial state of the second embodiment of the present invention;

FIG. 12 is a schematic structural view of a closure drive mechanism after closure of the head of a second embodiment of the invention;

FIG. 13 is a schematic structural view of a closure drive mechanism of a third embodiment of the present invention;

FIG. 14 is a schematic structural view of a closure drive mechanism of a fourth embodiment of the present invention;

FIG. 15 is a schematic structural view of a closure drive mechanism of a fifth embodiment of the present invention;

fig. 16 is a schematic configuration diagram of a closure drive mechanism according to a sixth embodiment of the present invention.

Reference numerals:

1 stapler body 42 second slide

11 third slide block for fixing handle 43

12 closure of the pull tab 44 second compression spring

13 case 51 pull cord

14 casing 52 steering brace beam

2 actuating lever 61 drive

21 pressing part 62 first driving part

22 firing member 63 first compression spring

23 rack 64 second drive

3 movable handle 65 connecting rod

31 claw 71 cylinder

32 link 72 seal

41 first slider 73 one-way valve

411 first recess 74 cavity portion

412 second groove

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 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 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 a medical anastomat and comprises a driving portion and a cylinder body, the driving portion is connected with a closing pulling piece of the anastomat and can pull the closing pulling piece to move along the axial direction of the anastomat, the driving portion is connected with the near end side of the cylinder body and can pull the near end side of the cylinder body to move along the axial direction of the anastomat, so that the length of the side wall of the cylinder body along the axial direction is extended or shortened, a cavity portion is formed inside the cylinder body, and the volume of the cavity portion changes along with the length change of the side wall of the cylinder body.

The cavity part is provided with a one-way valve. The check valve is opened when receiving a force in a first direction to make the cavity part communicated with the outside air, at the moment, if the volume of the cavity part is increased, the cavity part can be inflated through the opening degree of the check valve, and the check valve is closed when receiving a force in a second direction to make the cavity part become a closed cavity which is not communicated with the outside air, at the moment, if the volume of the cavity part is reduced, the air in the cavity part is compressed.

Prior to the stapler being fired, the operator needs to close the staple cartridge and anvil to clamp the tissue. At this time, the driving portion moves towards the proximal end side of the anastomat to drive the closing pull piece to move towards the proximal end of the anastomat so as to close the nail head portion, meanwhile, the driving portion drives the proximal end side of the cylinder body to move towards the proximal end side of the anastomat, the cylinder body extends along the axial direction of the anastomat, the volume of the cavity portion is increased, and the one-way valve is opened to inflate the cavity portion. With the increasing volume of the cavity, air is continuously introduced into the cavity to fill the increasing volume, thereby not hindering the closing process of the stud.

After the anastomat is fired, when the driving part moves towards the far end side of the anastomat, the closing pull piece is driven to move towards the far end side of the anastomat so as to open the nail head. At this time, the driving part drives the proximal end side of the cylinder body to move towards the distal end side of the anastomat, the length of the cylinder body along the axial direction of the anastomat is shortened, the volume of the cavity part is reduced, and the one-way valve is closed, so that the cavity part becomes a closed cavity. The air in the cavity part is compressed along with the continuous reduction of the volume of the cavity part, and the compressed air forms certain resistance to the movement of the driving part towards the far end direction of the anastomat, so that the movement speed of the driving part is reduced, the nail anvil and the nail bin can be slowly separated, and the situation that the surrounding tissues are injured due to the overlarge opening force of the jaw is avoided.

The structure of the closure driving mechanism and stapler according to an embodiment of the present invention will be further described with reference to fig. 1 to 16. In which figures 1 to 10 show the construction of a closure actuation mechanism and stapler according to a first embodiment of the invention.

As shown in FIGS. 1 to 6, the configuration of the closure driving mechanism and the stapler in the initial state in the first embodiment is shown. In this embodiment, the stapler includes a stapler body 1 and a staple head (not shown in the figure) located at the distal end side of the stapler body 1, the stapler body 1 includes a housing 13 and a fixing handle 11, a sleeve 14 extending along the axial direction of the stapler is further provided inside the stapler body 1, a closing pull tab 12 for closing and opening the staple head is provided inside the sleeve 14, the anvil and the staple cartridge are separated when the closing pull tab 12 is in an initial state, the anvil and the staple cartridge are closed when the closing pull tab 12 moves to the proximal end side of the stapler, and the staple head can be reopened when the closing pull tab 12 moves to the distal end side of the stapler.

As shown in fig. 1 to 4, the closing driving mechanism includes a driving portion 61 and a cylinder 71, and both the driving portion 61 and the cylinder 71 are sleeved outside the casing 14. The driving part 61 is connected with the closing pull tab 12 of the anastomat to form linkage of the driving part 61 and the closing pull tab 12, and the driving part 61 is fixedly connected with the near end side of the cylinder body 71 to form linkage of the driving part 61 and the near end side of the cylinder body 71. The inside of the cylinder 71 forms a cavity 74, and the cavity 74 is provided with a check valve 73.

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 towards the side facing away from the toothed rack 23 with respect to the actuating rod 2, the downward or downward direction being opposite thereto. For example, in the perspective of fig. 1, 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 in the perspective of fig. 1 and 2, the upward direction refers to the upper end in the drawing.

In this embodiment, the one-way valve 73 is provided on the distal end side of the cylinder 71. When the one-way valve 73 is subjected to a force from the distal side to the proximal side of the stapler, the one-way valve 73 is opened, and the cavity portion 74 is communicated with the outside air, and when the one-way valve 73 is subjected to a force from the proximal side to the distal side of the stapler, the one-way valve 73 is closed, and the cavity portion 74 is a closed cavity. As shown in fig. 4 to 6, in order to better achieve the tightness of the cavity 74, the cylinder 71 and the sleeve 14 are connected in a sealing manner, a sealing member 72 is preferably disposed between the outer wall of the sleeve 14 and the inner wall of the opening of the sleeve 14, which is sleeved by the cylinder 71, and the sealing member 72 may be a sealing ring, but the present invention is not limited thereto, and the sealing member 62 may be made of a flexible material such as rubber, plastic, etc.

In this embodiment, the side wall of the cylinder 71 is a flexible side wall, for example, the side wall is made of plastic, textile material, etc. In a preferred embodiment, the distal and proximal sides of the barrel 71 may be provided as rigid, while only the sidewall of the barrel 71 is a deformable sidewall. In an alternative embodiment, the entire body of the cylinder 71 may be made of a flexible material, for example, the entire body of the cylinder 71 may be made of plastic, rubber, etc. As shown in FIGS. 4-6, in the initial state, the flexible sidewall of the cylinder 71 has a predetermined amount of bending deformation.

In this embodiment, the distal side of the cylinder 71 is fixed to the housing 13 of the stapler, thereby keeping the position of the distal side of the cylinder 71 relatively stable. When the proximal side of the cylinder 71 moves in the axial direction of the stapler, the distance between the distal side of the cylinder 71 and the proximal side of the cylinder 71 changes.

As shown in fig. 3 to 6, the closing drive mechanism further includes the movable handle 3, a biasing member, a pull rope 51, a steering support beam 52 and a first slider 41, and in order to reduce resistance to movement of the pull rope 51, the steering support beam 52 is preferably in a pulley structure. The biasing member gives the driving portion 61 a biasing force towards the distal side of the stapler. In this embodiment, the biasing member is a first compression spring 63 disposed on the proximal end side of the driving portion 61, but in other alternative embodiments, the biasing member may be configured by a tension spring, a spring plate, or the like, without being limited thereto.

A second groove 412 is formed in a side surface of the first slider 41, one end of the pull rope 51 is disposed in the second groove 412, and the other end of the pull rope 51 is fixed to the driving part 61, so that the first slider 41 and the driving part 61 are linked. Further, after the movement of the first slider 41 is transmitted to the driving portion 61 by the steering support beam 52, the movement direction of the first slider 41 is opposite to the movement direction of the driving portion 61.

As shown in fig. 3, the closure drive mechanism further comprises a holding member and an actuation rod 2, the actuation rod 2 extending in the axial direction of the stapler. The holder comprises a second slider 42 and a third slider 43, and a second compression spring 44 is arranged below the third slider 43. The actuating rod 2 comprises a pressing part 21 and a firing part 22, and in the initial state, the initial positions of the first slider 41 and the pressing part 21 are both located at the proximal side of the holding part.

As shown in fig. 7 to 9, the structure of the closing driving mechanism is shown when the nail head of the stapler is driven to close in the first embodiment. The movable handle 3 is held, the movable handle 3 drives the first slider 41 to move towards the distal end side of the stapler through the connecting rod 32, and simultaneously, the movable handle 3 drives the actuating rod 2 to move towards the distal end side of the stapler through the claw 31. When the first slider 41 moves towards the distal end side of the stapler, the driving part 61 is pulled by the pull rope 51 to press the first compression spring 63 to generate compression deformation, and the driving part 61 simultaneously drives the closing pull tab 12 to move towards the proximal end side of the stapler so as to drive the anvil and the staple cartridge to close and close the head part of the staple cartridge.

In the closing process of the nail head, the driving part 61 simultaneously drives the proximal end side of the cylinder 71 to move to the proximal end side of the stapler, the distance between the proximal end side of the cylinder 71 and the distal end side of the cylinder 71 is increased, the bending deformation amount of the cylinder 71 is reduced, the length of the cylinder 71 along the axial direction of the stapler is elongated, the volume of the cavity 74 is increased, and the one-way valve 73 is opened by a force towards the proximal end side of the stapler to form a communication channel between the cavity 74 and the outside air. Therefore, during the closing of the head, the unidirectional air damping structure does not hinder the movement of the driver 61, and the head can be closed normally to clamp the tissue.

As shown in FIG. 7, when the head is closed, the first slider 41 moves to below the holder, while the pressing portion 21 (not shown in this figure) of the actuating rod 2 contacts the upper side of the third slider 43 in the holder and presses the third slider 43 downward, so that the second slider 42 in the third slider 43 partially enters the first recess 411 on the upper surface of the first slider 41 to maintain the stability of the position of the first slider 41 during the stapler firing process. At this time, the second compression spring 44 is compressively deformed by the third slider 43. In this process, due to the deformation restoring force of the first slider 41 to the first compression spring 63 by the pulling force of the pulling rope 51 applied to the driving part 61 in the direction toward the proximal end of the stapler, the driving part 61 is kept at the position in fig. 7 by the pulling of the pulling rope 51, thereby keeping the stability of closing the nail head during the firing of the stapler.

Here, the manner of matching the first slider 41 and the holder is only one embodiment, and in other alternative embodiments, an upwardly concave groove may be provided on the lower surface of the holder, and when the pressing portion 21 of the actuating lever 2 presses the holder downward, the holder moves downward so that the upper end of the first slider 41 enters into the groove of the holder, thereby achieving the engagement between the holder and the first slider 41.

FIG. 10 illustrates the structure of the closure driving mechanism after the stapler has been fired in a first embodiment. At this time, the pressing portion 21 (not shown in the figure) of the actuating lever 2 no longer presses the third slider 43 downward, and the third slider 43 moves upward by the deformation restoring force of the second compression spring 44, so that the second slider 42 is moved upward to be disengaged from the first recess 411 of the first slider 41. The first slider 41 loses the retaining action of the retaining member and is free to move without exerting any pulling force on the driving portion 61 towards the proximal side of the stapler. At this time, under the action of the deformation restoring force of the first pressure spring 63, the driving portion 61 moves towards the distal end side of the stapler, and drives the closing pull tab 12 to move towards the distal end side of the stapler, so that the anvil and the staple cartridge of the stapler are separated to open the staple head.

In the process of opening the nail head of the stapler, as the driving portion 61 moves toward the distal side of the stapler, the distance between the proximal side wall of the cylinder 71 and the distal side wall of the cylinder 71 gradually decreases, the length of the cylinder 71 in the axial direction of the stapler gradually decreases, the volume of the cavity 74 gradually decreases, and the one-way valve 73 is closed by the force toward the distal side of the stapler. At this time, the cavity 74 is not communicated with the external air, the air is gradually compressed along with the reduction of the volume of the cavity 74, the movement of the driving part 61 to the distal end side of the stapler is resisted by the compressed air, so that the movement speed of the driving part 61 is reduced, and the nail head part of the stapler is slowly opened. In other alternative embodiments, the side wall of the cavity 74 may be further opened with a small air hole communicated with the air, and the small air hole can only be deflated to the outside very slowly when the volume of the cavity 74 is reduced, however, the deflation speed of the small air hole is not higher than the compression speed of the air, so that the air still generates resistance to the movement of the driving portion 62 to the distal side. The opening degree of the small pneumatic is preferably smaller than that when the check valve 73 is opened, but the present invention is not limited thereto.

In an alternative embodiment, the side wall of the cylinder 71 may also be an elastic side wall, for example, a rubber material capable of generating tensile deformation and recovering the original shape after the tensile deformation is adopted. In an initial state, the sidewall of the cylinder 71 is not deformed, and when the driving portion 61 drives the proximal end side of the cylinder 71 to move toward the proximal end side of the stapler, the elastic sidewall of the cylinder 71 is pulled to be elastically deformed. When the driving part 61 drives the proximal end side of the cylinder 71 to move towards the distal end side of the anastomat, the elastic tensile deformation of the cylinder 71 is gradually reduced, so that the length of the cylinder 71 along the axial direction of the anastomat is shortened.

Fig. 11 and 12 are schematic views showing the structure of a closing drive mechanism according to a second embodiment of the present invention. This embodiment differs from the first embodiment in that: in the first embodiment, the driving part 61 is located inside the cylinder 71, and the inner wall of the cylinder 71 and the driving part 61 enclose the cavity 74; in the second embodiment, the driving part 61 is located outside the cylinder 71, and the inner wall of the cylinder 71 surrounds the cavity. In an alternative embodiment, the driving portion 61 may be only partially located inside the cylinder 71, and partially located outside the cylinder 71, which is within the protection scope of the present invention.

Fig. 13 is a schematic structural view of a closing drive mechanism according to a third embodiment of the present invention. This embodiment differs from the first embodiment in that: in this embodiment, the tubular body 71 is a bellows extending in the axial direction of the stapler, and in an initial state, the bellows has a compression deformation amount, and when the driving portion 61 moves toward the proximal end side of the stapler, the compression deformation amount of the bellows decreases, the axial length of the bellows increases, and the volume of the cavity inside the bellows increases, and when the driving portion 61 moves toward the distal end side of the stapler, the compression deformation amount of the bellows increases, the axial length of the bellows decreases, and the volume of the cavity inside the bellows decreases.

Fig. 14 is a schematic structural view of a closing drive mechanism according to a fourth embodiment of the present invention. This embodiment differs from the third embodiment in that: in this embodiment, the driving portion 61 is located outside the cylinder 71, and the inner wall of the cylinder 71 surrounds the cavity.

Fig. 15 is a schematic structural view of a closing drive mechanism according to a fifth embodiment of the present invention. This embodiment differs from the first embodiment in that: the drive portion 61 comprises a first drive 62 and a second drive 64 connected, the first drive 62 being connected to the closure tab 12, the second drive 64 being connected to the proximal side of the barrel 71. The first driving member 62 is located at the distal end side of the cylinder 71, and the first driving member 62 and the second driving member 64 are connected by a connecting rod 65. The first pressure spring 63 is disposed between the proximal end side of the first driving member 62 and the cylinder 71, and may be fitted over the connecting rod 65. When the second driving member 64 moves toward the proximal end side of the stapler, the first driving member 62 is pulled to move toward the proximal end side of the stapler, and the first pressing spring 63 is compressed and deformed by the first driving member 62. After the pulling force of the pulling rope 51 on the second driving member 64 toward the proximal side is removed, the first driving member 62 moves toward the distal side by the deformation restoring force of the first compression spring 63, and drives the pull tab 12 and the second driving member 64 to move toward the distal side of the stapler. In the fifth embodiment, at least two sets of the cylinder 71 and the second driver 64 may be provided, the first driver 61 is fixedly connected to the plurality of second drivers 64 at the same time, and the plurality of check valves 73 are provided in the cavity 74 of each cylinder 71.

In other alternative embodiments, the second driving member 64 may be located outside the cylinder 71, and in another alternative embodiment, the first driving member 62 may be located inside the cylinder 71, and the first compression spring 63 is disposed on the proximal side of the second driving member 64, all falling within the scope of the present invention.

Fig. 16 is a schematic structural view of a closing drive mechanism according to a sixth embodiment of the present invention. This embodiment differs from the fifth embodiment in that: the pull tab 12 and the second actuator 64 are not coaxially disposed and the first actuator 62 may be fixedly attached to a side wall of the second actuator 64. In this embodiment, the operation principle of the first driving member 62 and the second driving member 64 is the same as that of the embodiment shown in fig. 15, and the description thereof is omitted.

The closing driving mechanism and the medical anastomat comprising the same have the following advantages that:

the invention provides a closing driving mechanism for a medical anastomat, which is additionally provided with a cylinder body matched with a driving part, wherein the side wall of the cylinder body is made of flexible or elastic materials, the cylinder body can be extended or shortened under the driving of the driving part to cause the volume change of a cavity part in the cylinder body, and the opening and closing of a communication channel between the cavity part and the external air are controlled by a one-way valve; when the nail head part is driven to be closed, the side wall of the cylinder body extends along the axial direction to increase the volume of the cavity part, the one-way valve is opened to inflate the cavity part, and the driving part drives the pull piece to move towards the near end side of the anastomat so as to drive the nail head part to be closed; after the anastomat is fired, the side wall of the cylinder body is shortened along the axial direction to reduce the volume of the cavity, the one-way valve is closed, air in the cavity is compressed, the driving part is subjected to the resistance of the compressed air to slow down the movement to the far end side of the anastomat, so that the nail head can be slowly opened, and the phenomenon that the surrounding tissues are injured due to overlarge force for opening the jaw is avoided.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (13)

1. A closing driving mechanism is characterized by being used for a medical anastomat and comprising a driving part and a cylinder body, wherein the driving part is connected with a closing pulling piece of the anastomat and connected with the proximal end side of the cylinder body, a cavity part is formed in the cylinder body, and a one-way valve is arranged in the cavity part;

when the driving part moves towards the proximal end side of the anastomat, the driving part respectively drives the closing pull piece and the proximal end side of the cylinder body to move towards the proximal end side of the anastomat, the length of the cylinder body along the axial direction of the anastomat is extended, the volume of the cavity part is increased, and the one-way valve is opened;

when the driving part moves towards the far end side of the anastomat, the driving part drives the closing pull piece and the near end side of the cylinder body to move towards the far end side of the anastomat respectively, the length of the cylinder body in the axial direction of the anastomat is shortened, the volume of the cavity part is reduced, and the one-way valve is closed.

2. The closure drive mechanism of claim 1, wherein the drive portion comprises a first drive member and a second drive member connected, the first drive member being connected with the closure pull tab, the second drive member being connected with the proximal side of the barrel.

3. The closure drive mechanism of claim 1, wherein the drive portion is at least partially located inside the barrel, an inner wall of the barrel and the drive portion enclosing the cavity.

4. The closure drive mechanism according to claim 1, wherein the side wall of the cylinder is a flexible side wall, and wherein in the initial state, the flexible side wall of the cylinder has a bending deformation amount, and wherein the bending deformation amount of the flexible side wall is reduced when the driving portion moves to the proximal side of the stapler.

5. The closure driving mechanism as claimed in claim 1, wherein the side wall of the cylinder is an elastic side wall, and the driving portion pulls the elastic side wall of the cylinder to deform elastically when the driving portion moves the proximal end side of the cylinder to the proximal end side of the stapler.

6. The closure driving mechanism according to claim 1, wherein the cylinder is a bellows extending in an axial direction of the stapler, the bellows having a compression deformation amount in an initial state, and the compression deformation amount of the bellows is reduced when the driving portion moves to a proximal side of the stapler.

7. The closure drive mechanism of claim 1, further comprising a sleeve, wherein the barrel and the drive portion are both sleeved on the sleeve, and the drive portion is movable in an axial direction of the sleeve;

and a sealing element is arranged between the outer wall of the sleeve and the barrel.

8. The closure drive mechanism of claim 1, wherein the one-way valve is disposed on a distal side of the barrel.

9. The closure driving mechanism as claimed in claim 1, wherein the cavity is further opened with an air hole communicating with air.

10. The closure drive mechanism of claim 1, wherein the distal side of the barrel is secured to a housing of the stapler.

11. The closure drive mechanism of claim 1, further comprising a biasing member and a pull cord, the biasing member and the pull cord being respectively connected to the drive portion;

when the nail head part of the anastomat is driven to close, the pull rope pulls the driving part to move towards the proximal end side of the anastomat, and the biasing piece deforms;

when the nail head of the anastomat is driven to be opened, the driving part moves towards the far end side of the anastomat under the action of the deformation restoring force of the biasing piece.

12. The closure drive mechanism according to claim 11, further comprising a movable handle, a slider and a steering support beam, wherein the pull rope is sleeved on the steering support beam, and two ends of the pull rope are respectively connected to the slider and the driving portion;

in an initial state, when the movable handle is held, the movable handle drives the sliding block to move towards the far end side of the anastomat, and the sliding block pulls the driving part to move towards the near end side of the anastomat through the pull rope.

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

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