CN210990511U

CN210990511U - Closing driving mechanism and medical anastomat comprising same

Info

Publication number: CN210990511U
Application number: CN201921425089.0U
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 driving mechanism and medical anastomat comprising the same, the closed driving mechanism comprises a closed driving piece, a piston part and a cylinder body, the closed driving piece is connected with the piston part, the inner wall of the cylinder body and the piston part which is positioned at the near end side of the cylinder body are enclosed into a cavity part, one side of the cavity part is provided with a one-way valve, when the piston part moves towards the far end side of the anastomat, the volume of the cavity part is reduced, the one-way valve is closed to form a one-way air damping structure, the piston part drives the closed driving piece to move towards the far end side of the anastomat so as to drive the nail head part of the anastomat to be opened, and because the piston part is resisted by the compressed air in the cavity part, the movement speed of the piston part is slowed down, so that the nail bin and the nail anvil of the anastomat are slowly separated, avoiding the damage to the surrounding tissue caused by excessive force for opening the jaws.

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 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.

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.

SUMMERY OF THE UTILITY MODEL

To the problem among the prior art, the utility model aims to provide a closed actuating mechanism reaches medical anastomat including it, through one-way air damping structure, after the anastomat percussion is accomplished, the pin fin portion is slowly opened.

The embodiment of the utility model provides a closing driving mechanism for medical anastomat, closing driving mechanism includes closed driving piece, piston portion and barrel, closed driving piece with the piston portion is connected, the piston portion is located the near-end side of barrel, enclose into a cavity portion between the inner wall of barrel and the piston portion, the cavity portion is provided with the check valve;

when the piston part moves towards the proximal end side of the anastomat, the volume of the cavity part is increased, the one-way valve is opened, and the piston part drives the closing driving piece to move towards the proximal end side of the anastomat so as to drive the nail head part of the anastomat to close;

when the piston part moves towards the far end side of the anastomat, the volume of the cavity part is reduced, the one-way valve is closed, and the piston part drives the closing driving piece to move towards the far end side of the anastomat so as to drive the nail head part of the anastomat to be opened.

Optionally, the cartridge is part of the stapler housing.

Alternatively, the closure drive and the piston portion are integrally provided as one piece.

Optionally, a first sealing ring is arranged between the outer wall of the piston part and the inner wall of the cylinder body.

Optionally, the mechanism further includes a sleeve, the cylinder and the piston portion are both sleeved on the sleeve, and the piston portion can move along the axial direction of the sleeve;

and a second sealing ring is arranged between the outer wall of the sleeve and the cylinder body.

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

Optionally, the outer wall of the cylinder is provided with at least one first fixing portion, and the housing of the anastomat is provided with a second fixing portion matched with the first fixing portion.

Optionally, the outer wall of the cylinder body is provided with at least one fixing groove, and the shell of the anastomat is provided with a fixing beam matched with the fixing groove;

or

The outer wall of the cylinder body is provided with at least one fixed beam, and the shell of the anastomat is provided with a fixed groove matched with the fixed beam.

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

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

when the nail head part of the anastomat is driven to close, the pull rope pulls the piston 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 piston part moves towards the far end side of the anastomat under the deformation restoring force of the biasing piece.

Optionally, the biasing member is a compression spring disposed on a proximal side of the piston portion.

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 piston 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 piston part to move towards the near end side of the anastomat through the pull rope.

Optionally, the closure drive mechanism further comprises a holder and an actuating rod, the actuating rod comprising a pressing portion, the initial positions of the slider and the pressing portion both being located at a proximal side of the holder;

in an initial state, when the movable handle is held, the movable handle drives the actuating rod to move towards the far end side of the anastomat, and the pressing part of the actuating rod downwards presses the retainer to be embedded with the sliding block;

after the stapler is fired, the pressing portion of the actuating lever does not press the retainer any more, the retainer moves upward to be disengaged from the slider, and the piston portion moves toward the distal end side of the stapler by the deformation restoring force of the biasing member.

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 close driving mechanism for a medical anastomat, which is additionally provided with a one-way air damping structure, when the nail head part is closed and driven, a one-way valve is opened to communicate a cavity part with external air, and a piston part drives a close driving piece to move towards the near end side of the anastomat to drive the nail head part to be closed; after the anastomat is fired, the one-way valve is closed, the piston part compresses air in the cavity part by moving to the distal end side of the anastomat, and the piston part slows down movement by the resistance of the compressed air, so that the nail head part can be opened slowly, and the situation that the surrounding tissues are injured by overlarge opening force of the jaw is avoided.

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 structure of FIG. 2 with the cartridge removed;

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 a schematic view showing a positional relationship between the cylinder and the piston portion in an initial state according to the first embodiment of the present invention;

fig. 6 is a plan view of the closure drive mechanism in an initial state of the first embodiment of the present invention;

FIG. 7 is a sectional view taken in the direction A1-A1 of FIG. 6;

FIG. 8 is a schematic view showing the positional relationship between the cylinder and the piston during the percussion operation of the first embodiment of the present invention;

FIG. 9 is a top plan view of the closure drive mechanism during firing of the first embodiment of the present invention;

FIG. 10 is a sectional view taken in the direction A2-A2 of FIG. 9;

FIG. 11 is a schematic view showing the positional relationship between the cylinder and the piston after the first embodiment of the present invention is fired;

fig. 12 is a schematic structural view of a closing drive mechanism in an initial state according to a second embodiment of the present invention;

fig. 13 is a schematic structural view of a closing drive mechanism in an initial state according to a third embodiment of the present invention;

fig. 14 is a schematic structural view of a closing drive mechanism in an initial state according to a fourth embodiment of the present invention;

fig. 15 is a schematic structural view of a closing drive mechanism in an initial state according to a fifth 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

15 fixed beam 61 closing drive

2 actuating rod 62 first seal

21 pressing part 63 first pressure spring

22 firing member 64 piston portion

23 rack 65 connecting rod

3 Movable handle 71 cylinder

31 claw 711 fixing groove

32 link 72 second 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 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 closing driving piece, a piston part and a cylinder body, wherein the closing driving piece is connected with the closing pulling piece and can pull the closing pulling piece to move along the axial direction of the anastomat. The closing driving member and the piston portion may be a single unit or two units separately connected to each other.

The piston part is located on the near end side of the cylinder body, a cavity part is enclosed between the inner wall of the cylinder body and the piston part, and the cavity part is provided with a one-way valve, so that the piston part and the cylinder body jointly form an air damping structure. The one-way valve is opened when being subjected to a force in a first direction, so that the cavity part is communicated with the outside air, and the one-way valve is closed when being subjected to a force in a second direction, so that the cavity part becomes a closed cavity which is not communicated with the outside air.

Prior to the stapler being fired, the operator needs to close the staple cartridge and anvil to clamp the tissue. At this time, when the piston portion moves towards the proximal end side of the anastomat, because the distance between the distal end side wall of the piston portion and the distal end side wall of the cylinder body is increased, the volume of the cavity portion is increased, the one-way valve is opened by the force of the first direction, the piston portion drives the closing driving piece to move towards the proximal end side of the anastomat, so that the closing pulling piece of the anastomat is driven to move towards the proximal end side of the anastomat, and the nail head portion of the anastomat is driven to be closed. Since the one-way valve opens during this process to form an air flow path, air is continuously drawn into the cavity to fill the increased volume as the piston portion moves proximally, thereby not hindering the closing process of the stud portion.

After the anastomat is fired, the piston portion moves towards the far end side of the anastomat, the distance between the far end side wall of the piston portion and the far end side wall of the cylinder body is reduced, at the moment, the volume of the cavity portion is reduced, the one-way valve is closed under the action of force in the second direction, the piston portion drives the closing driving piece to move towards the far end side of the anastomat, and the closing driving piece drives the closing pull piece to move towards the far end side of the anastomat so as to drive the nail head portion of the anastomat to be opened. Therefore, in the process, the one-way valve is closed to enable the cavity portion to be a closed cavity, air in the cavity portion is compressed along with the reduction of the volume of the cavity portion, the movement of the piston portion to the far end side of the anastomat is resisted by the compressed air, the movement speed of the piston portion is reduced, the nail head portion of the anastomat can be opened slowly, and the situation that the surrounding tissues are injured due to the fact that the force for opening the jaws is too large is avoided.

The structure of the closing drive mechanism and the stapler according to an embodiment of the present invention will be further described with reference to fig. 1 to 15. Fig. 1 to 11 show a structure of a closing drive mechanism according to a first embodiment of the present invention. In the first embodiment, the closure drive and the piston portion are one part provided integrally, and thus, in fig. 1-11, the closure drive and the piston portion are both represented by the closure drive 61, i.e. the closure drive 61 acts both as a part driving the closure tab and as a piston portion of the unidirectional air damping structure. Fig. 12, 13, 14 and 15 show the construction of the closure drive mechanism of the second, third, fourth and fifth embodiments, respectively, of the present invention, in which the closure drive and piston portion are two separately provided parts, denoted respectively as closure drive 61 and piston portion 64.

As shown in FIGS. 1 to 7, the structure of the closing drive mechanism in the initial state in the first embodiment is shown. The anastomat comprises an anastomat body 1 and a nail head (not shown in the figure) located on the far-end side of the anastomat body 1, the anastomat body 1 comprises a shell 13 and a fixed handle 11, a closing pull sheet 12 used for closing the nail head and opening the nail head is further arranged inside the anastomat body 1, the nail head is opened when the closing pull sheet 12 is in an initial state, the nail head is closed when the closing pull sheet 12 moves towards the near-end side of the anastomat, and the nail head can be opened again when the closing pull sheet 12 moves towards the far-end side of the anastomat.

As shown in fig. 1 to 4, the closing driving mechanism includes a closing driving member 61 and a cylinder 71, a distal end side of the closing driving member 61 is connected to the closing pull-tab 12, and the closing driving member 61 can drive the closing pull-tab 12 to move along an axial direction of the stapler. The closure drive 61 is located on the proximal side of the barrel 71 and the closure drive 61 is located at least partially inside the barrel 71. A cavity 74 is enclosed between the inner wall of the cylinder 71 and the closing driving member 61, and the cavity 74 is provided with a one-way valve 73. 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 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.

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. As shown in fig. 1 and 5, the closure drive mechanism further includes a sleeve 14, and the closure pull tab 12 is disposed inside the sleeve 14. The sleeve 14 extends in the axial direction of the stapler. The barrel 71 and the closure actuator 61 are both fitted around the outside of the sleeve 14. In this embodiment, as shown in fig. 1 and 2, the outer wall of the cylinder 71 is provided with at least one fixing groove 711, and the housing 13 of the stapler is provided with a fixing beam 15 which is matched with the fixing groove 711, so that the position of the cylinder 71 relative to the housing 13 is kept stable during the operation of the stapler. In other alternative embodiments, at least one fixing beam may be disposed on an outer wall of the cylinder 71, and the housing 13 of the stapler may be provided with a fixing groove engaged with the fixing beam to fix the cylinder 71. In other alternative embodiments, fixing grooves may be provided on the outer wall of the cylinder 71, and the housing 13 of the stapler may be provided with matching fixing beams, or the cylinder 71 and the housing 13 may be fixed relative to each other by using other fixing structures, such as mutually matching bosses and grooves. In addition, in other alternative embodiments, the cylinder 71 may not be fixed to the housing 13, but may be movably disposed in the housing 13 of the stapler, or the cylinder 71 is fixed to the sleeve 14, etc., which all fall within the protection scope of the present invention. The cylinder 71 may also be a part of the housing 13, that is, the cylinder 71 is integrally formed with the housing 13, in this embodiment, the housing 13 is divided into two parts, that is, a first housing 13 and a second housing (not shown in the figure), and accordingly, the cylinder 71 includes a first cylinder disposed on the first housing 13 and a second cylinder disposed on the second housing; when the first housing 13 and the second housing are fastened together, the first cylinder and the second cylinder are fastened to form a corresponding cylinder 71.

As shown in fig. 3, in order to achieve a better sealing effect between the outer wall of the closing driving member 61 and the inner wall of the cylinder 71, a first sealing member 62, specifically a first sealing ring 62, is preferably disposed between the outer wall of the closing driving member 61 and the inner wall of the cylinder 71, and the first sealing ring 62 may be made of a flexible material such as rubber, plastic, and the like. In other alternative embodiments of the present invention, the first sealing ring 62 may not be provided, and one of the closing driving member 61 and the cylinder 71 may be made of a flexible material, so as to realize the sealing attachment between the inner wall of the cylinder 71 and the outer wall of the closing driving member 61. The first sealing ring 62 is arranged, or one of the closing driving piece 61 and the cylinder body 71 is made of flexible material, so that not only can the sealing function be achieved, but also the friction force generated when the closing driving piece 61 and the cylinder body 71 move relatively can be increased, and the opening and closing processes of the jaws are mild and stable.

As shown in fig. 5, in order to better achieve the tightness of the cavity 74, the cylinder 71 is connected to the sleeve 14 in a sealing manner, a second sealing element 72, specifically a second sealing ring 72, is preferably disposed between an outer wall of the sleeve 14 and an inner wall of an opening of the sleeve 14, which is sleeved by the cylinder 71, and the second sealing ring 72 may be made of a flexible material such as rubber, plastic, and the like.

As shown in fig. 5 to 7, 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 provides a biasing force to the closure drive member 61 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 closing driving member 61, but in other alternative embodiments, the biasing member may also be a tension spring, a spring plate, or the like, and is not 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 closing driving member 61, so that the first slider 41 and the closing driving member 61 are linked. After the movement of the first slider 41 is transmitted to the closing driving member 61 through the steering support beam 52, the movement direction of the first slider 41 is opposite to the movement direction of the closing driving member 61.

As shown in fig. 5, 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 FIGS. 8 to 10, the structure of the closing driving mechanism is shown when the nail head of the stapler is driven to close in the first embodiment. In this embodiment, in the initial state, the movable handle 3 is held, the movable handle 3 drives the first slider 41 to move toward the distal end side of the stapler through the link 32, and at the same time, the movable handle 3 drives the actuating lever 2 to move toward the distal end side of the stapler through the claw 31.

When the first slider 41 moves towards the distal end side of the anastomat, the closing driving piece 61 is pulled by the pull rope 51 to move towards the proximal end side of the anastomat, the closing driving piece 61 presses the first pressure spring 63 to generate compression deformation, and the closing driving piece 61 simultaneously drives the closing pull piece 12 to move towards the proximal end side of the anastomat so as to drive the nail head to close.

During the closing process of the nail head, since the distance between the distal end side wall of the closing driver 61 and the distal end side wall of the cylinder 71 gradually increases along with the movement of the closing driver 61 to the distal end side, the volume of the cavity 74 enclosed by the closing driver 61 and the cylinder 71 gradually increases, and the one-way valve 73 is forced to open towards the proximal end side of the stapler to form a communication channel between the cavity 74 and the outside air. Thus, during closure of the head, the one-way air damping structure does not impede the movement of the closure driver 61 and the head can be closed properly to clamp tissue.

As shown in FIG. 8, 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 on the first compression spring 63 by the pulling force of the pull rope 51 on the closing driver 61 in the direction towards the proximal end of the stapler, the closing driver 61 is kept in the position shown in fig. 10 under the pulling of the pull 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. 11 illustrates the configuration 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 closing drive 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 closing driving member 61 moves to the distal end side of the stapler, and drives the closing pull tab 12 to move to the distal end side of the stapler, so as to drive the nail head of the stapler to be opened.

During the process of opening the nail head of the stapler, as the closing driving member 61 moves to the distal side of the stapler, the distance between the distal side wall of the closing driving member 61 and the distal side wall of the cylinder 71 gradually decreases, the volume of the cavity 74 gradually decreases, and the check 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 outside air, the air is gradually compressed as the volume of the cavity 74 is reduced, the movement of the closing driving member 61 to the distal end side of the stapler is resisted by the compressed air, so that the movement speed of the closing driving member 61 is slowed, and the nail head 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, which can only be deflated 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 air compression speed, so that the air still generates resistance to the movement of the closing driving member 61 to the distal side.

In addition, since the first sealing ring 62 is arranged between the outer wall of the closing driving member 61 and the inner wall of the cylinder 71, the contact surface between the first sealing ring 62 and the cylinder 71 also has a certain damping effect on the movement of the closing driving member 61 towards the distal side of the stapler, which is more beneficial to reducing the movement speed of the closing driving member 61.

Fig. 12 to 15 are schematic structural views of the closing drive mechanism according to the second, third, fourth, and fifth embodiments of the present invention, respectively. The four embodiments differ from the first embodiment in that the piston part 64 and the closure drive 61 are provided separately as two interconnected parts. The piston portion 64 is located on the proximal side of the barrel 71, the piston portion 64 is sized to fit within the interior wall of the barrel 71 to form a sealed connection with the barrel 71, and the shape and size of the closure actuator 61 is not limited to that shown in fig. 14, but is sufficient to transmit the motion of the piston portion 64 to the closure tab 12.

As shown in fig. 12, in the second embodiment, the closing driving member 61 is located in the cavity portion of the cylinder 71, and the closing driving member 61 is fixedly connected with the piston portion 64, the closing driving member 61 is connected with the pull tab 12, and the piston portion 64 is connected with the pull cord 51. The closing drive 61 may be dimensioned smaller relative to the piston portion 64, whereby the closing drive 61 does not form a sealing connection with the cylinder 71, whereas a sealing connection is formed between the side wall of the piston portion 64 and the inner wall of the cylinder 71, and a movement of the closing drive 61 in the cavity does not affect a change in the volume of the cavity itself, whereas only a movement of the piston portion 64 towards the distal side and the proximal side of the stapler causes a decrease and an increase in the volume of the cavity. The piston portion 64 may be made of flexible material or the first sealing ring 62 may be disposed between the piston portion 64 and the inner wall of the cylinder 71, which not only can play a sealing role, but also can increase the friction force during the relative movement between the piston portion 64 and the cylinder 71, so as to make the opening and closing processes of the jaws mild and stable.

When the piston portion 64 moves towards the proximal end side of the stapler under the action of the pull rope 51, because the distance between the distal end side wall of the piston portion 64 and the distal end side wall of the cylinder 71 increases, the volume of the cavity portion increases, the check valve 73 is opened by the force towards the proximal end side, the piston portion 64 drives the closing driving member 61 to move towards the proximal end side of the stapler to drive the closing pull tab 12 of the stapler to move towards the proximal end side of the stapler, so that the nail head of the stapler is driven to be closed, and meanwhile, the piston portion 64 compresses the first pressure spring 63 at the proximal end side to deform. When the piston part 64 moves to the distal end side of the stapler under the action of the deformation restoring force of the first pressure spring 63, because the distance between the distal end side wall of the piston part 64 and the distal end side wall of the cylinder 71 is reduced, at this time, the volume of the cavity part is reduced, the check valve 73 is closed by the force towards the distal end side, the piston part 64 drives the closing driving part 61 to move to the distal end side of the stapler, and the closing driving part 61 drives the closing pull piece 12 to move to the distal end side of the stapler, so as to drive the head part of the stapler to be opened. In the process, the air in the cavity part is compressed along with the reduction of the volume of the cavity part, and the movement of the piston part 64 to the distal end side of the anastomat is resisted by the compressed air, so that the movement speed of the piston part is reduced, the nail head part of the anastomat can be opened slowly, and the condition that the opening force of the jaws is too large to hurt the surrounding tissues is avoided.

As shown in fig. 13, in the third embodiment, the difference from the second embodiment is that the closing drive 61 is located at the distal end side of the cylinder 71, and the connection between the closing drive 61 and the piston portion 64 is made by the connecting rod 65, and since the closing drive 61 is outside the cylinder 71, the movement of the closing drive 61 does not affect the volume of the cavity portion. As shown in fig. 14, in the fourth embodiment, the difference from the third embodiment is that the first compression spring 63 is not provided on the proximal end side of the piston portion 64, but is provided between the proximal end side of the closing driver 61 and the cylinder 71, and may be fitted over the connecting rod 65. Similarly, when the piston portion 64 moves to the proximal end side, the closing driver 61 is pulled to move to the proximal end side, and the closing driver 61 compresses the first compression spring 63 to deform. After the pulling force of the pull cord 51 to the proximal side by the piston portion 64 is removed, the closing actuator 61 moves to the distal side by the deformation restoring force of the first compression spring 63, and moves the tab 12 and the piston portion 64 to the distal side.

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 two embodiments shown in fig. 12 to 13 in that the pull tab 12 and the piston portion 64 are not arranged coaxially, and the closure drive 61 may be fixedly connected to the side wall of the piston portion 64. In this embodiment, the working principle of the closing driver 61 and the piston portion 64 is the same as in the embodiment shown in fig. 12 and 13, and will not be described again here. In the fifth embodiment, the cylinder 71 and the piston portion 64 may be provided in at least two sets, the closing actuator 61 may be fixedly connected to the plurality of piston portions 64 at the same time, and the plurality of check valves 73 may be provided in the cavity portion 74 of each cylinder 71.

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 closing driving piece, a piston part and a cylinder body, wherein the closing driving piece is connected with the piston part, the piston part is positioned on the proximal end side of the cylinder body, a cavity part is defined between the inner wall of the cylinder body and the piston part, and a one-way valve is arranged in the cavity part;

2. The closure drive mechanism of claim 1, wherein the cartridge is part of the stapler housing.

3. The closure drive mechanism of claim 1, wherein the closure drive member and the piston portion are integrally provided as one piece.

4. The closure drive mechanism of claim 1, wherein a first seal is disposed between an outer wall of the piston portion and an inner wall of the barrel.

5. The closure actuating mechanism of claim 1, further comprising a sleeve, wherein the cylinder and the piston portion are both disposed on the sleeve, and the piston portion is movable in an axial direction of the sleeve;

and a second sealing element is arranged between the outer wall of the sleeve and the cylinder body.

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

7. The closure driving mechanism according to claim 1, wherein the outer wall of the cartridge body is provided with at least a first fixing portion, and the housing of the stapler is provided with a second fixing portion cooperating with the first fixing portion.

8. The closure driving mechanism as claimed in claim 7, wherein the outer wall of the cylinder is provided with at least one fixing groove, and the housing of the stapler is provided with a fixing beam matched with the fixing groove;

or

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, further comprising a biasing member and a pull cord, the biasing member and the pull cord being respectively coupled to the piston portion;

11. The closure drive mechanism of claim 10, wherein the biasing member is a compression spring disposed on a proximal side of the piston portion.

12. The closure actuating mechanism of claim 10, 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 piston portion;

13. The closure drive mechanism of claim 12, further comprising a holder and an actuation rod, the actuation rod including a pressing portion, the initial positions of the slider and the pressing portion each being located on a proximal side of the holder;

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