Closed driving mechanism and medical stapler including the same

Abstract

The present invention provides a closing drive mechanism and a medical stapler including the same, wherein the closing drive mechanism includes a driving part and a barrel, wherein the driving part is connected to a closing pull tab of the stapler, wherein the driving part is connected to the proximal side of the barrel, wherein a cavity is formed inside the barrel, and wherein a one-way valve is provided in the cavity. When the stapler head is closed, the driving part moves toward the distal side of the stapler, driving the axial length of the barrel to shorten, and the volume of the compressed cavity to become smaller, wherein the one-way valve is closed to prevent the air in the cavity from being connected to the external air, wherein the air in the cavity is compressed to form resistance to the movement of the driving part, slowing down the movement speed of the piston part, so that the stapler magazine and the staple anvil of the stapler are slowly separated, thereby preventing the jaws from opening with excessive force and damaging surrounding tissues.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a closing drive mechanism and a medical stapler comprising the same. Background Art

[0002] Digestive tract diseases are one of the most common diseases in humans. During the treatment process, medical staplers are often used to replace the doctor's manual operation to anastomose physiological tissues such as the digestive tract. Medical staplers are a common surgical instrument, most of which use axial internal stapling to form end-to-end or end-to-side anastomosis of physiological tissues such as the esophagus, stomach, and intestines during surgery. During the anastomosis, the two sections of tissue are contained in the medical stapler. After the firing is completed, a circular anastomosis is formed on the tissue, reconstructing the human body channel.

[0003] 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 that cooperates with the body. The staple head includes a staple magazine and a staple anvil that are arranged relatively to each other. During surgery, the movable handle is first held, and the closing pull tab of the staple head is pulled toward the proximal side of the stapler through the closing drive mechanism, so that the staple magazine and the staple anvil assembly are closed. Then, the operating handle is held again to push the staples toward the tissue, and the tissue is stapled by the staples in the staple magazine being formed at the staple anvil assembly. After the stapler is fired, the staple head needs to be opened to separate the staple magazine and the staple anvil. However, in the existing stapler structure, after the stapler is fired, the staple magazine and the staple anvil will be separated relatively suddenly and quickly, and the suddenly opened jaws may damage other tissues.

[0004] In the present invention, the distal side and the proximal side are relative to the operator, the end closer to the operator is the proximal side, and the end farther from the operator, that is, the end closer to the surgical site is the distal side. Summary of the invention

[0005] In view of the problems in the prior art, the object of the present invention is to provide a closed drive mechanism and a medical stapler including the same, through which the stapler head slowly opens after the stapler is fired through a one-way air damping structure.

[0006] An embodiment of the present invention provides a closing drive mechanism for a medical stapler, the closing drive mechanism comprising a driving part and a barrel, the driving part being connected to a closing pull tab of the stapler, the driving part being connected to a proximal end of the barrel, a cavity being formed inside the barrel, and a one-way valve being provided in the cavity;

[0007] When the driving part moves toward the proximal side of the stapler, the closing pull tab and the proximal side of the cylinder are driven to move toward the proximal side of the stapler respectively, the length of the cylinder along the axial direction of the stapler is extended, the volume of the cavity is increased, and the one-way valve is opened;

[0008] When the driving portion moves toward the distal end of the stapler, it drives the closing pull tab and the proximal end of the cylinder to move toward the distal end of the stapler, the length of the cylinder along the axial direction of the stapler is shortened, the volume of the cavity is reduced, and the one-way valve is closed.

[0009] 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 the proximal side of the cylinder.

[0010] Optionally, the driving portion is at least partially located inside the cylinder, and the inner wall of the cylinder and the driving portion form the cavity.

[0011] Optionally, the side wall of the cylinder is a flexible side wall. In an initial state, the flexible side wall of the cylinder has a bending deformation amount. When the driving part moves toward the proximal side of the stapler, the bending deformation amount of the flexible side wall decreases.

[0012] Optionally, the side wall of the cylinder is an elastic side wall, and when the driving portion drives the proximal side of the cylinder to move toward the proximal side of the stapler, the elastic side wall of the cylinder is pulled to undergo elastic deformation.

[0013] Optionally, the cylinder is a bellows extending along the axial direction of the stapler, and in an initial state, the bellows has a compressive deformation amount, and when the driving portion moves toward the proximal side of the stapler, the compressive deformation amount of the bellows decreases.

[0014] Optionally, the mechanism further comprises a sleeve, the cylinder and the driving part are both sleeved on the sleeve, and the driving part can move along the axial direction of the sleeve;

[0015] A sealing member is arranged between the outer wall of the sleeve and the cylinder.

[0016] Optionally, the one-way valve is arranged on the distal side of the cylinder.

[0017] Optionally, the cavity portion is further provided with an air hole communicating with the air.

[0018] Optionally, the distal end side of the cylinder is fixed to the housing of the stapler.

[0019] Optionally, it further comprises a biasing member and a pull rope, wherein the biasing member and the pull rope are respectively connected to the driving part;

[0020] When the stapler head is driven to close, the pull rope pulls the driving part to move toward the proximal end of the stapler, and the biasing member is deformed;

[0021] When the stapler head portion is driven to open, the driving portion moves toward the distal end side of the stapler under the deformation restoring force of the biasing member.

[0022] Optionally, the closing drive 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;

[0023] In the initial state, when the movable handle is held, the movable handle drives the slider to move toward the distal end of the stapler, and the slider pulls the driving part to move toward the proximal end of the stapler through the pull rope.

[0024] An embodiment of the present invention further provides a medical stapler, comprising the above-mentioned closing drive mechanism.

[0025] The closed drive mechanism and the medical stapler including the same provided by the present invention have the following advantages:

[0026] The present invention provides a closing drive mechanism for a medical stapler, which adds a cylinder to cooperate with a driving part. The side wall of the cylinder is made of a flexible or elastic material, and can be extended or shortened under the drive of the driving part, thereby causing a volume change of a cavity part inside the cylinder, and the opening and closing of a communication channel between the cavity part and the external air is controlled by a one-way valve; when the nail head is driven to close, the side wall of the cylinder is extended in the axial direction to increase the volume of the cavity part, the one-way valve is opened and air is inflated into the cavity part, and the driving part drives the pull tab to move toward the proximal side of the stapler to drive the nail head to close; after the stapler is fired, the side wall of the cylinder is shortened in the axial direction to reduce the volume of the cavity part, the one-way valve is closed, the air in the cavity part is compressed, and the driving part is subjected to the resistance of the compressed air and slows down the movement toward the distal side of the stapler, so that the nail head can be slowly opened to avoid excessive force of opening the jaws and damage to surrounding tissues. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0028] Figure 1 It is a schematic structural diagram of the cooperation between the closing drive mechanism and the housing of the stapler according to the first embodiment of the present invention;

[0029] Figure 2 yes Figure 1 A schematic diagram of the structure after removing the stapler housing;

[0030] Figure 3 yes Figure 2 Schematic diagram of the structure after removing the cylinder;

[0031] Figure 4 is a structural schematic diagram of the closing drive mechanism in the initial state of the first embodiment of the present invention;

[0032] Figure 5 is a top view of the closing drive mechanism in the initial state of the first embodiment of the present invention;

[0033] Figure 6 yes Figure 5 A1-A1 cross-sectional view;

[0034] Figure 7 2 is a schematic structural diagram of a closing drive mechanism after the nail head is closed according to the first embodiment of the present invention;

[0035] Figure 8 is a top view of the closing drive mechanism after the nail head is closed in the first embodiment of the present invention;

[0036] Fig. 9 yes Figure 8 A cross-sectional view along the A2-A2 direction;

[0037] Fig.10 is a structural schematic diagram of the closing drive mechanism of the stapler of the first embodiment of the present invention after firing is completed;

[0038] Fig.11 is a structural schematic diagram of a closing drive mechanism in an initial state of a second embodiment of the present invention;

[0039] Fig.12 2 is a schematic structural diagram of a closing drive mechanism after the nail head is closed according to a second embodiment of the present invention;

[0040] Fig.13 is a schematic structural diagram of a closing drive mechanism according to a third embodiment of the present invention;

[0041] Fig.14 is a schematic structural diagram of a closing drive mechanism according to a fourth embodiment of the present invention;

[0042] Fig.15 is a schematic structural diagram of a closing drive mechanism according to a fifth embodiment of the present invention;

[0043] Fig.16 2 is a schematic structural diagram of a closing drive mechanism according to a sixth embodiment of the present invention.

[0044] Reference numerals:

[0045] 1 stapler body 42 second slider

[0046] 11 Fixed handle 43 Third slide

[0047] 12 Closing pull tab 44 Second compression spring

[0048] 13 housing 51 pull rope

[0049] 14 bushing 52 steering support beam

[0050] 2 Actuating rod 61 Driving part

[0051] 21 Pressing portion 62 First driving member

[0052] 22 firing member 63 first compression spring

[0053] 23 rack 64 second drive member

[0054] 3 Movable handle 65 Connecting rod

[0055] 31 claw 71 cylinder

[0056] 32 Connecting rod 72 Seal

[0057] 41 first slider 73 one-way valve

[0058] 411 first groove 74 cavity portion

[0059] 412 Second groove DETAILED DESCRIPTION

[0060] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0061] In order to solve the technical problems in the prior art, the present invention provides a closing drive mechanism for a medical stapler and a medical stapler including the stapler. The stapler includes a stapler head and a stapler body, and a closing pull tab for closing the stapler head is provided in the stapler body. The closing drive mechanism is used for a medical stapler, and the closing drive mechanism includes a driving part and a cylinder, the driving part is connected to the closing pull tab of the stapler, and can pull the closing pull tab to move along the axial direction of the stapler, the driving part is connected to the proximal side of the cylinder, and can pull the proximal side of the cylinder to move along the axial direction of the stapler, so that the length of the side wall of the cylinder in the axial direction is extended or shortened, and a cavity is formed inside the cylinder, and as the length of the side wall of the cylinder changes, the volume of the cavity also changes.

[0062] The cavity is provided with a one-way valve. The one-way valve opens when subjected to a force in a first direction, so that the cavity is connected to the outside air. At this time, if the volume of the cavity increases, air can be inflated into the cavity through the opening of the one-way valve. When subjected to a force in a second direction, the one-way valve closes, so that the cavity becomes a closed cavity that is not connected to the outside air. At this time, if the volume of the cavity decreases, the air in the cavity is compressed.

[0063] Before the stapler is fired, the operator needs to close the stapler magazine and the stapler anvil to clamp the tissue. At this time, the driving unit moves toward the proximal side of the stapler, driving the closing pull tab to move toward the proximal end of the stapler to close the stapler head. At the same time, the driving unit drives the proximal side of the cylinder to move toward the proximal side of the stapler, and the cylinder is extended along the axial direction of the stapler. The volume of the cavity increases, and the one-way valve opens to inflate the cavity. As the volume of the cavity continues to increase, air continues to enter the cavity to fill the increased volume, thereby not hindering the closing process of the stapler head.

[0064] After the stapler is fired, when the driving unit moves toward the distal side of the stapler, it drives the closing pull tab to move toward the distal side of the stapler to open the nail head. At this time, the driving unit drives the proximal side of the cylinder to move toward the distal side of the stapler, the length of the cylinder along the axial direction of the stapler is shortened, the volume of the cavity is reduced, and the one-way valve is closed to make the cavity a closed cavity. The air in the cavity is compressed as the volume of the cavity continues to decrease. The compressed air forms a certain resistance to the movement of the driving unit toward the distal direction of the stapler, thereby slowing down the movement speed of the driving unit, so that the anvil and the nail magazine can be slowly separated, thereby avoiding excessive force to open the jaws and damage surrounding tissues.

[0065] Combine the following Figures 1 to 16 The structure of the closed drive mechanism and the stapler in the specific embodiment of the present invention is further described. Figures 1 to 10 The structure of the closing drive mechanism and the stapler according to the first embodiment of the present invention is shown.

[0066] like Figures 1 to 6 FIG. 1 shows the structure of the closing drive mechanism and the stapler in the initial state of the first embodiment. In this embodiment, the stapler includes a stapler body 1 and a nail head (not shown in the figure) located at the distal end of the stapler body 1. The stapler body 1 includes a housing 13 and a fixed handle 11. The stapler body 1 is further provided with a sleeve 14 extending along the axial direction of the stapler. The sleeve 14 is provided with a closing tab 12 for closing and opening the nail head. When the closing tab 12 is in the initial state, the nail anvil and the nail magazine are separated. When the closing tab 12 moves toward the proximal end of the stapler, the nail anvil and the nail magazine are closed. When the closing tab 12 moves toward the distal end of the stapler again, the nail head can be reopened.

[0067] like Figures 1 to 4 As shown, the closing drive mechanism includes a driving part 61 and a cylinder 71, and the driving part 61 and the cylinder 71 are both sleeved on the outside of the sleeve 14. The driving part 61 is connected to the closing pull tab 12 of the stapler to form a linkage between the driving part 61 and the closing pull tab 12, and the driving part 61 is fixedly connected to the proximal side of the cylinder 71 to form a linkage between the driving part 61 and the proximal side of the cylinder 71. A cavity 74 is formed inside the cylinder 71, and a one-way valve 73 is provided in the cavity 74.

[0068] 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 upper or upward direction is relative to the actuating rod 2, toward the side away from the rack 23, and the lower or downward direction is opposite to it. For example, in Figure 1 In the perspective of FIG. 1 , the distal end of the stapler body 1 is the left end in the figure, and the proximal end of the stapler body 1 is the right end in the figure. Figure 1 and Figure 2 In the perspective of , the upward direction refers to the upper end of the figure.

[0069] In this embodiment, the one-way valve 73 is disposed at the distal end of the barrel 71. When the one-way valve 73 is subjected to a force from the distal end to the proximal end of the stapler, the one-way valve 73 opens, and at this time the cavity 74 is connected to the external air. When the one-way valve 73 is subjected to a force from the proximal end to the distal end of the stapler, the one-way valve 73 closes, and at this time the cavity 74 is a closed cavity. Figures 4 to 6As shown, in order to better achieve the airtightness of the cavity portion 74, the cylinder 71 and the sleeve 14 are sealed and connected, and a seal 72 is preferably provided between the outer wall of the sleeve 14 and the inner wall of the opening on which the cylinder 71 is sleeved on the sleeve 14. The seal 72 can be a sealing ring, but the present invention is not limited thereto. The seal 62 can be made of flexible materials such as rubber and plastic.

[0070] In this embodiment, the side wall of the barrel 71 is a flexible side wall, for example, the side wall is made of plastic, textile material and the like. In a preferred embodiment, the distal end and the proximal end of the barrel 71 can be set to be rigid, and only the side wall of the barrel 71 is a deformable side wall. In an alternative embodiment, the entire barrel 71 can also be made of a flexible material, for example, the entire barrel 71 can be made of plastic, rubber and the like. Figures 4 to 6 As shown, in the initial state, the flexible side wall of the cylinder 71 has a predetermined bending deformation.

[0071] In this embodiment, the distal end of the barrel 71 is fixed to the housing 13 of the stapler, thereby maintaining a relatively stable position of the distal end of the barrel 71. When the proximal end of the barrel 71 moves along the axial direction of the stapler, the distance between the distal end of the barrel 71 and the proximal end of the barrel 71 changes accordingly.

[0072] like Figures 3 to 6 As shown, the closing drive mechanism also includes a movable handle 3, a biasing member, a pull rope 51, a steering support beam 52 and a first slider 41. In order to reduce the resistance of the pull rope 51 during movement, the steering support beam 52 preferably adopts a pulley structure. The biasing member gives the driving part 61 a biasing force toward the distal end of the stapler. In this embodiment, the biasing member is a first compression spring 63 provided on the proximal side of the driving part 61. In other replaceable embodiments, the biasing member may also adopt a tension spring, a spring sheet or other structures, but is not limited thereto.

[0073] A second groove 412 is provided on the side of the first slider 41, one end of the pull rope 51 is provided in the second groove 412, and the other end of the pull rope 51 is fixed to the driving part 61, so as to realize the linkage between the first slider 41 and the driving part 61. In addition, after the movement of the first slider 41 is transmitted to the driving part 61 through the steering support beam 52, the movement direction of the first slider 41 is opposite to the movement direction of the driving part 61.

[0074] like Figure 3As shown, the closing drive mechanism further includes a retaining member and an actuating rod 2, and the actuating rod 2 extends along the axial direction of the stapler. The retaining member includes 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 includes a pressing portion 21 and a firing member 22. In the initial state, the initial positions of the first slider 41 and the pressing portion 21 are both located at the proximal side of the retaining member.

[0075] like Figures 7 to 9 As shown, the structure of the closing drive mechanism when driving the stapler's nail head to close in the first embodiment is shown. Holding the movable handle 3, the movable handle 3 drives the first slider 41 to move toward the distal side of the stapler through the connecting rod 32. At the same time, the movable handle 3 drives the actuating rod 2 to move toward the distal side of the stapler through the claw 31. When the first slider 41 moves toward the distal side of the stapler, the driving part 61 is pulled by the pull rope 51 to compress the first compression spring 63 to produce compression deformation. The driving part 61 simultaneously drives the closing pull tab 12 to move toward the proximal side of the stapler to drive the nail anvil and the nail magazine to close and close the nail head.

[0076] During the closing process of the nail head, the driving part 61 simultaneously drives the proximal side of the cylinder 71 to move toward the proximal side of the stapler, the distance between the proximal side of the cylinder 71 and the distal side of the cylinder 71 increases, the bending deformation of the cylinder 71 decreases, the length of the cylinder 71 along the axial direction of the stapler is extended, the volume of the cavity 74 increases, and the one-way valve 73 is opened by the force toward the proximal side of the stapler, forming a communication channel between the cavity 74 and the external air. Therefore, during the closing process of the nail head, the one-way air damping structure does not hinder the movement of the driving part 61, and the nail head can be closed normally to clamp the tissue.

[0077] like Figure 7 As shown, when the nail head is closed, the first slider 41 moves to the bottom of the retaining member, and at the same time, the pressing portion 21 (not shown in the figure) of the actuating rod 2 contacts the top of the third slider 43 in the retaining member and presses the third slider 43 downward, so that the second slider 42 in the third slider 43 partially enters the first groove 411 on the upper surface of the first slider 41 to maintain the stability of the position of the first slider 41 during the firing process of the stapler. At this time, under the action of the third slider 43, the second compression spring 44 is compressed and deformed. In this process, due to the pulling force applied by the first slider 41 to the driving portion 61 toward the proximal side of the stapler through the pull rope 51 for the deformation restoring force of the first compression spring 63, the driving portion 61 is kept in the proximal side of the stapler under the pull of the pull rope 51. Figure 7 The stapler is positioned in the middle position, thereby maintaining the stability of the staple head closure during the stapler firing process.

[0078] The cooperation between the first slider 41 and the retaining member here is only one embodiment. In other alternative embodiments, an upwardly recessed groove may be provided on the lower surface of the retaining member. When the pressing portion 21 of the actuating rod 2 presses the retaining member downward, the retaining member moves downward so that the upper end of the first slider 41 enters into the groove of the retaining member, thereby achieving the engagement between the retaining member and the first slider 41.

[0079] like Fig.10 As shown, the structure of the closing drive mechanism after the stapler is fired in the first embodiment is shown. At this time, the pressing portion 21 (not shown in the figure) of the actuating rod 2 no longer presses the third slider 43 downward, and the third slider 43 moves upward under the deformation recovery force of the second compression spring 44, and drives the second slider 42 to move upward to disengage from the first groove 411 of the first slider 41. The first slider 41 loses the holding effect of the retaining member and can move freely, and no longer applies a pulling force toward the proximal side of the stapler to the driving portion 61. At this time, under the deformation recovery force of the first compression spring 63, the driving portion 61 moves toward the distal side of the stapler, driving the closing pull tab 12 to move toward the distal side of the stapler, so that the stapler anvil and the stapler magazine of the stapler are separated and the stapler head is opened.

[0080] During the process of opening the stapler's nail head, as the drive unit 61 moves toward the distal side of the stapler, the distance between the proximal side wall of the barrel 71 and the distal side wall of the barrel 71 gradually decreases, the length of the barrel 71 along 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 connected to the external air, and the air is gradually compressed as the volume of the cavity 74 decreases. The movement of the drive unit 61 toward the distal side of the stapler will be subject to the resistance of the compressed air, thereby slowing down the movement speed of the drive unit 61, and the stapler's nail head slowly opens. In other alternative embodiments, a small air hole connected to the air may be further provided on the side wall of the cavity 74, and the small air hole can only release air to the outside very slowly when the volume of the cavity 74 decreases, but the air release speed of the small air hole is not as fast as the speed at which the air is compressed, so the air still creates resistance to the movement of the driving part 62 toward the distal end. The opening of the small air hole is preferably smaller than the opening of the one-way valve 73 when it is opened, but the present invention is not limited thereto.

[0081] In an alternative embodiment, the side wall of the barrel 71 may also be an elastic side wall, for example, a rubber material that can produce tensile deformation and can recover to its original shape after tensile deformation. In the initial state, the side wall of the barrel 71 is not deformed. When the driving part 61 drives the proximal side of the barrel 71 to move toward the proximal side of the stapler, the elastic side wall of the barrel 71 is pulled to undergo elastic tensile deformation. When the driving part 61 drives the proximal side of the barrel 71 to move toward the distal side of the stapler, the elastic tensile deformation of the barrel 71 gradually decreases, thereby shortening the length of the barrel 71 along the axial direction of the stapler.

[0082] like Fig.11 and 12 FIG. 1 is a schematic diagram of the structure of the closed drive mechanism of the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that: in the first embodiment, the drive part 61 is located inside the cylinder 71, and the inner wall of the cylinder 71 and the drive part 61 form the cavity 74; while in the second embodiment, the drive part 61 is located outside the cylinder 71, and the inner wall of the cylinder 71 forms the cavity. In an alternative embodiment, the drive part 61 may be only partially located inside the cylinder 71 and partially located outside the cylinder 71, all of which are within the protection scope of the present invention.

[0083] like Fig.13 FIG. 1 is a schematic diagram of the structure of the closed drive mechanism of the third embodiment of the present invention. The difference between this embodiment and the first embodiment is that: in this embodiment, the cylinder 71 is a bellows extending in the axial direction of the stapler, and in the initial state, the bellows has a compression deformation amount. When the drive unit 61 moves toward the proximal 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. When the drive unit 61 moves toward the distal 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.

[0084] like Fig.14 , which is a schematic diagram of the structure of the closing drive mechanism of the fourth embodiment of the present invention. The difference between this embodiment and the third embodiment is that in this embodiment, the driving part 61 is located outside the cylinder 71, and the inner wall of the cylinder 71 forms the cavity.

[0085] like Fig.15, which is a schematic diagram of the structure of the closing drive mechanism of the fifth embodiment of the present invention. The difference between this embodiment and the first embodiment is that the drive part 61 includes a first drive member 62 and a second drive member 64 connected to each other, the first drive member 62 is connected to the closing pull tab 12, and the second drive member 64 is connected to the proximal side of the cylinder 71. The first drive member 62 is located at the distal side of the cylinder 71, and the first drive member 62 and the second drive member 64 are connected by a connecting rod 65. The first compression spring 63 is arranged between the proximal side of the first drive member 62 and the cylinder 71, and can be sleeved on the connecting rod 65. When the second drive member 64 moves toward the proximal side of the stapler, the first drive member 62 is pulled to move toward the proximal side of the stapler, and the first drive member 62 compresses the first compression spring 63 to deform. After the pulling force of the pull rope 51 on the second driving member 64 toward the proximal side is eliminated, the first driving member 62 moves toward the distal side under the deformation recovery 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. Based on the fifth embodiment, the cylinder 71 and the second driving member 64 can be arranged in at least two groups, the first driving member 61 is fixedly connected to a plurality of the second driving members 64 at the same time, and a plurality of the one-way valves 73 are respectively arranged in the cavity 74 of each of the cylinders 71.

[0086] In other optional embodiments, the second driving member 64 may also be located outside the cylinder 71. In another optional embodiment, the first driving member 62 may also be located inside the cylinder 71, and the first compression spring 63 is arranged on the proximal side of the second driving member 64, all of which are within the protection scope of the present invention.

[0087] like Fig.16 , which is a schematic diagram of the structure of the closing drive mechanism of the sixth embodiment of the present invention. The difference between this embodiment and the fifth embodiment is that the pull tab 12 and the second drive member 64 are not coaxially arranged, and the first drive member 62 can be fixedly connected to the side wall of the second drive member 64. In this embodiment, the working principle of the first drive member 62 and the second drive member 64 is the same as that of the fifth embodiment. Fig.15 The embodiments shown in FIG. 1 are the same as those shown in FIG. 1 and will not be described in detail here.

[0088] The closed drive mechanism and the medical stapler including the same provided by the present invention have the following advantages:

[0089] The present invention provides a closing drive mechanism for a medical stapler, which adds a cylinder to cooperate with a driving part. The side wall of the cylinder is made of a flexible or elastic material, and can be extended or shortened under the drive of the driving part, thereby causing a volume change of a cavity part inside the cylinder, and the opening and closing of a communication channel between the cavity part and the external air is controlled by a one-way valve; when the nail head is driven to close, the side wall of the cylinder is extended in the axial direction to increase the volume of the cavity part, the one-way valve is opened and air is inflated into the cavity part, and the driving part drives the pull tab to move toward the proximal side of the stapler to drive the nail head to close; after the stapler is fired, the side wall of the cylinder is shortened in the axial direction to reduce the volume of the cavity part, the one-way valve is closed, the air in the cavity part is compressed, and the driving part is subjected to the resistance of the compressed air and slows down the movement toward the distal side of the stapler, so that the nail head can be slowly opened to avoid excessive force of opening the jaws and damage to surrounding tissues.

[0090] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A closed drive mechanism, characterized in that: For a medical stapler, the closing drive mechanism comprises a driving part and a barrel, the driving part is connected to the closing pull tab of the stapler, the driving part is connected to the proximal end side of the barrel, a cavity is formed inside the barrel, and a one-way valve is provided in the cavity; When the driving part moves toward the proximal side of the stapler, the closing pull tab and the proximal side of the cylinder are driven to move toward the proximal side of the stapler respectively, the length of the cylinder along the axial direction of the stapler is extended, the volume of the cavity is increased, and the one-way valve is opened; When the driving portion moves toward the distal end of the stapler, it drives the closing pull tab and the proximal end of the cylinder to move toward the distal end of the stapler, the length of the cylinder along the axial direction of the stapler is shortened, the volume of the cavity is reduced, and the one-way valve is closed.

2. The closing drive mechanism according to claim 1, characterized in that: The driving portion includes a first driving member and a second driving member connected to each other, wherein the first driving member is connected to the closing pull tab, and the second driving member is connected to the proximal end side of the cylinder.

3. The closing drive mechanism according to claim 1, characterized in that: The driving part is at least partially located inside the cylinder, and the inner wall of the cylinder and the driving part form the cavity.

4. The closing drive mechanism according to claim 1, characterized in that: The side wall of the cylinder is a flexible side wall. In an initial state, the flexible side wall of the cylinder has a bending deformation amount. When the driving part moves toward the proximal side of the stapler, the bending deformation amount of the flexible side wall decreases.

5. The closing drive mechanism according to claim 1, characterized in that: The side wall of the cylinder is an elastic side wall. When the driving part drives the proximal side of the cylinder to move toward the proximal side of the stapler, the elastic side wall of the cylinder is pulled to undergo elastic deformation.

6. The closing drive mechanism according to claim 1, characterized in that: The cylinder is a bellows extending in the axial direction of the stapler. In an initial state, the bellows has a compressive deformation amount. When the driving part moves toward the proximal end side of the stapler, the compressive deformation amount of the bellows decreases.

7. The closing drive mechanism according to claim 1, characterized in that: The mechanism further comprises a sleeve, the cylinder and the driving part are both sleeved on the sleeve, and the driving part can move along the axial direction of the sleeve; A sealing member is arranged between the outer wall of the sleeve and the cylinder.

8. The closing drive mechanism according to claim 1, characterized in that: The one-way valve is arranged on the distal end side of the cylinder.

9. The closing drive mechanism according to claim 1, characterized in that: The cavity portion is also provided with air holes communicated with the air.

10. The closing drive mechanism according to claim 1, characterized in that: The distal end side of the cylinder is fixed to the housing of the stapler.

11. The closing drive mechanism according to claim 1, characterized in that: It also includes a biasing member and a pull rope, wherein the biasing member and the pull rope are respectively connected to the driving part; When the stapler head is driven to close, the pull rope pulls the driving part to move toward the proximal end of the stapler, and the biasing member is deformed; When the stapler head portion is driven to open, the driving portion moves toward the distal end side of the stapler under the deformation restoring force of the biasing member.

12. The closing drive mechanism according to claim 11, characterized in that: The closing drive 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 the initial state, when the movable handle is held, the movable handle drives the slider to move toward the distal end of the stapler, and the slider pulls the driving part to move toward the proximal end of the stapler through the pull rope.

13. A medical stapler, characterized in that: The invention comprises the closing drive mechanism according to any one of claims 1 to 12.

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