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. The closing drive mechanism comprises a closing drive member, a piston part and a cylinder body. The closing drive member is connected to the piston part. A cavity part is formed between the inner wall of the cylinder body and the piston part located on the proximal side of the cylinder body. A one-way valve is provided on one side of the cavity part. When the piston part moves toward the distal side of the stapler, the volume of the cavity part decreases, and the one-way valve is closed to form a one-way air damping structure. The piston part drives the closing drive member to move toward the distal side of the stapler to drive the stapler head to open. Since the piston part is subjected to the resistance of the compressed air in the cavity part, the movement speed of the piston part is slowed down, so that the stapler magazine and the stapler anvil of the stapler are slowly separated, thereby avoiding excessive force of opening the jaws to damage 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 closing drive member, a piston portion and a cylinder, the closing drive member is connected to the piston portion, the piston portion is located at the proximal end side of the cylinder, a cavity portion is formed between the inner wall of the cylinder and the piston portion, and the cavity portion is provided with a one-way valve;

[0007] When the piston moves toward the proximal end of the stapler, the volume of the cavity increases, the one-way valve opens, and the piston drives the closing drive member to move toward the proximal end of the stapler to drive the stapler's nail head to close;

[0008] When the piston moves toward the distal end of the stapler, the volume of the cavity decreases, the one-way valve closes, and the piston drives the closing drive member to move toward the distal end of the stapler to drive the stapler's nail head to open.

[0009] Optionally, the barrel is part of the stapler housing.

[0010] Optionally, the closing drive member and the piston portion are integrally formed into one component.

[0011] Optionally, a first sealing ring is provided between the outer wall of the piston portion and the inner wall of the cylinder.

[0012] Optionally, the mechanism further comprises 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;

[0013] A second sealing ring is arranged between the outer wall of the sleeve and the cylinder.

[0014] Optionally, the one-way valve is arranged on the distal side of the cylinder.

[0015] Optionally, the outer wall of the cylinder is provided with at least one first fixing portion, and the shell of the stapler is provided with a second fixing portion matching with the first fixing portion.

[0016] Optionally, 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;

[0017] or

[0018] The outer wall of the cylinder is provided with at least one fixing beam, and the shell of the stapler is provided with a fixing groove matched with the fixing beam.

[0019] Optionally, the cavity portion is further provided with an air hole communicating with the air.

[0020] Optionally, it further comprises a biasing member and a pull rope, wherein the biasing member and the pull rope are respectively connected to the piston part;

[0021] When the stapler head is driven to close, the pull rope pulls the piston part to move toward the proximal end of the stapler, and the biasing member is deformed;

[0022] When the stapler's nail head is driven to open, the piston moves toward the distal end of the stapler under the deformation restoring force of the biasing member.

[0023] Optionally, the biasing member is a compression spring disposed on the proximal side of the piston portion.

[0024] 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 piston part;

[0025] 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 piston part to move toward the proximal end of the stapler through the pull rope.

[0026] Optionally, the closing drive mechanism further comprises a retaining member and an actuating rod, the actuating rod comprises a pressing portion, and the initial positions of the slider and the pressing portion are both located at the proximal side of the retaining member;

[0027] In the initial state, when the movable handle is held, the movable handle drives the actuating rod to move toward the distal end of the stapler, and the pressing portion of the actuating rod presses the retaining member downward to engage with the slider;

[0028] After the stapler is fired, the pressing portion of the actuating rod no longer presses the retaining member, the retaining member moves upward to disengage from the slider, and the piston portion moves toward the distal end side of the stapler under the deformation restoring force of the biasing member.

[0029] An embodiment of the present invention further provides a medical stapler, comprising the above-mentioned closing drive mechanism.

[0030] The closed drive mechanism and the medical stapler including the same provided by the present invention have the following advantages:

[0031] The present invention provides a closing drive mechanism for a medical stapler, which is additionally provided with a one-way air damping structure. When the nail head is driven to close, the one-way valve opens to connect the cavity portion with the external air, and the piston portion drives the closing drive member to move toward the proximal side of the stapler to drive the nail head to close; after the stapler is fired, the one-way valve is closed, and the movement of the piston portion toward the distal side of the stapler compresses the air in the cavity portion. The piston portion is slowed down by the resistance of the compressed air, so that the nail head can be slowly opened, thereby preventing the jaws from opening with excessive force and damaging surrounding tissues. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 is a schematic diagram of a partial structure of the stapler in the initial state of the first embodiment of the present invention;

[0034] Figure 2 yes Figure 1 A schematic diagram of the structure in which the stapler housing is removed;

[0035] Figure 3 yes Figure 2 Schematic diagram of the structure after removing the cylinder;

[0036] Figure 4 is a structural schematic diagram of the closing drive mechanism in the initial state of the first embodiment of the present invention;

[0037] Figure 5 is a schematic diagram of the positional relationship between the cylinder and the piston portion in the initial state of the first embodiment of the present invention;

[0038] Figure 6 is a top view of the closing drive mechanism in the initial state of the first embodiment of the present invention;

[0039] Figure 7 yes Figure 6 A1-A1 cross-sectional view;

[0040] Figure 8 is a schematic diagram of the positional relationship between the cylinder and the piston during the firing process of the first embodiment of the present invention;

[0041] Fig. 9 is a top view of the closed drive mechanism during the firing process of the first embodiment of the present invention;

[0042] Fig.10 yes Fig. 9 A cross-sectional view along the A2-A2 direction;

[0043] Fig.11 is a schematic diagram of the positional relationship between the cylinder and the piston portion after the firing is completed in the first embodiment of the present invention;

[0044] Fig.12 is a structural schematic diagram of a closing drive mechanism in an initial state of a second embodiment of the present invention;

[0045] Fig.13 is a schematic structural diagram of a closing drive mechanism in an initial state of a third embodiment of the present invention;

[0046] Fig.14 is a structural schematic diagram of a closing drive mechanism in an initial state of a fourth embodiment of the present invention;

[0047] Fig.15It is a structural schematic diagram of the closing drive mechanism in the initial state of the fifth embodiment of the present invention.

[0048] Reference numerals:

[0049] 1 stapler body 42 second slider

[0050] 11 Fixed handle 43 Third slide

[0051] 12 Closing pull tab 44 Second compression spring

[0052] 13 housing 51 pull rope

[0053] 14 Casing 52 Steering support beam

[0054] 15 Fixed beam 61 Closed drive member

[0055] 2 Actuating rod 62 First seal

[0056] 21 Pressing portion 63 First compression spring

[0057] 22 firing member 64 piston part

[0058] 23 rack 65 connecting rod

[0059] 3 Movable handle 71 Cylinder

[0060] 31 Claw 711 Fixing slot

[0061] 32 connecting rod 72 second sealing element

[0062] 41 first slider 73 one-way valve

[0063] 411 first groove 74 cavity portion

[0064] 412 Second groove DETAILED DESCRIPTION

[0065] 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.

[0066] 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 closing drive member, a piston portion and a cylinder body, and the closing drive member is connected to the closing pull tab and can pull the closing pull tab to move along the axial direction of the stapler. The closing drive member and the piston portion can be an integrally arranged component, or can be two components that are separately arranged but connected to each other.

[0067] The piston part is located at the proximal end of the cylinder, and a cavity part is formed between the inner wall of the cylinder and the piston part. The cavity part is provided with a one-way valve, so that the piston part and the cylinder together form an air damping structure. The one-way valve will open when subjected to a force in a first direction, so that the cavity part is connected to the external air, and the one-way valve will close when subjected to a force in a second direction, so that the cavity part becomes a closed cavity that is not connected to the external air.

[0068] Before the stapler is fired, the operator needs to close the stapler magazine and the stapler anvil to clamp the tissue. At this time, when the piston moves toward the proximal side of the stapler, the distance between the distal side wall of the piston and the distal side wall of the cylinder increases, the volume of the cavity increases, the one-way valve is opened by the force in the first direction, and the piston drives the closing drive to move toward the proximal side of the stapler to drive the closing pull tab of the stapler to move toward the proximal side of the stapler, thereby driving the stapler head to close. Since in this process, the one-way valve opens to form an air circulation channel, as the piston moves toward the proximal side, air continuously enters the cavity to fill the increased volume, thereby not hindering the closing process of the stapler head.

[0069] After the stapler is fired, the piston moves toward the distal side of the stapler. Since the distance between the distal side wall of the piston and the distal side wall of the cylinder is reduced, the volume of the cavity is reduced, and the one-way valve is closed by the force in the second direction. The piston drives the closing drive to move toward the distal side of the stapler, and the closing drive drives the closing pull tab to move toward the distal side of the stapler to drive the stapler's nail head to open. In this process, 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 decreases. The movement of the piston toward the distal side of the stapler is subject to the resistance of the compressed air, thereby slowing down the movement speed of the piston, so that the stapler's nail head can be opened slowly, thereby avoiding excessive force to open the jaws and damage surrounding tissues.

[0070] Combine the following Figure 1 to Figure 15 The structure of the closed drive mechanism and the stapler in the specific embodiment of the present invention is further described. Figures 1 to 11 FIG. 2 shows the structure of the closing drive mechanism of the first embodiment of the present invention. In the first embodiment, the closing drive member and the piston portion are an integrally arranged component. Figures 1 to 11 In the figure, both the closing drive member and the piston part are represented by the closing drive member 61, that is, the closing drive member 61 serves as a component for driving the closing pull tab and a piston part of the one-way air damping structure. Fig.12 , Fig.13 , Fig.14 and Fig.15 The structures of the closing drive mechanisms of the second embodiment, the third embodiment, the fourth embodiment and the fifth embodiment of the present invention are respectively shown. In these four embodiments, the closing drive member and the piston portion are two separately arranged components, respectively represented as the closing drive member 61 and the piston portion 64.

[0071] like Figures 1 to 7 The figure shows the structure of the closing drive mechanism in the initial state in the first embodiment. The stapler comprises 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 comprises a housing 13 and a fixed handle 11. A closing pull tab 12 for closing and opening the nail head is also provided inside the stapler body 1. When the closing pull tab 12 is in the initial state, the nail head is open. When the closing pull tab 12 moves toward the proximal end of the stapler, the nail head is closed. When the closing pull tab 12 moves toward the distal end of the stapler again, the nail head can be reopened.

[0072] like Figures 1 to 4 As shown, the closing drive mechanism includes a closing drive member 61 and a cylinder 71, the distal end of the closing drive member 61 is connected to the closing pull tab 12, and the closing drive member 61 can drive the closing pull tab 12 to move along the axial direction of the stapler. The closing drive member 61 is located at the proximal end of the cylinder 71, and the closing drive member 61 is at least partially located inside the cylinder 71. A cavity 74 is formed between the inner wall of the cylinder 71 and the closing drive member 61, and a one-way valve 73 is provided in the cavity 74. In this embodiment, the one-way valve 73 is provided at the distal end of the cylinder 71. When the one-way valve 73 is subjected to a force from the distal end side to the proximal end 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 end side to the distal end side of the stapler, the one-way valve 73 is closed.

[0073] 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. Figure 1 and Figure 5 As shown, the closing drive mechanism further includes a sleeve 14, and the closing pull tab 12 is disposed inside the sleeve 14. The sleeve 14 extends along the axial direction of the stapler. The cylinder 71 and the closing drive member 61 are both sleeved outside the sleeve 14. Figure 1 and Figure 2 As shown, in this embodiment, 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 matched with the fixing groove 711, so as to keep the position of the cylinder 71 relative to the housing 13 stable during the operation of the stapler. In other alternative embodiments, the outer wall of the cylinder 71 can also be provided with at least one fixing beam, and the housing 13 of the stapler is provided with a fixing groove matched with the fixing beam, so as to fix the cylinder 71. In other alternative embodiments, a fixing groove can also be provided on the outer wall of the cylinder 71, and the housing 13 of the stapler can be provided with a matching fixing beam, or the cylinder 71 and the housing 13 can also be relatively fixed by other fixing structures, such as mutually matching bosses and grooves. In addition, in other alternative embodiments, the cylinder 71 can also be not fixed to the housing 13, but movably arranged in the housing 13 of the stapler, or the cylinder 71 is fixed on the sleeve 14, etc., all of which belong to the protection scope of the present invention. The cylinder 71 can also be a part of the shell 13 itself, that is, the cylinder 71 is integrally formed with the shell 13. In the present embodiment, the shell 13 is divided into two parts, namely a first shell 13 and a second shell (not shown in the figure). Accordingly, the cylinder 71 includes a first cylinder arranged on the first shell 13 and a second cylinder arranged on the second shell; when the first shell 13 and the second shell are buckled together, the first cylinder and the second cylinder are buckled into a corresponding cylinder 71.

[0074] like Figure 3As shown, in order to achieve a better sealing effect between the outer wall of the closed driving member 61 and the inner wall of the cylinder 71, it is preferred to set a first sealing member 62 between the outer wall of the closed driving member 61 and the inner wall of the cylinder 71, specifically a first sealing ring 62, and the first sealing ring 62 can be made of flexible materials such as rubber and plastic. In other optional embodiments of the present invention, the first sealing ring 62 may not be set, and one of the closed driving member 61 or the cylinder 71 may be made of a flexible material to achieve a sealed fit between the inner wall of the cylinder 71 and the outer wall of the closed driving member 61. The first sealing ring 62 is provided, or one of the closed driving member 61 or the cylinder 71 is made of a flexible material, which can not only play a sealing role, but also increase the friction force during the relative movement between the closed driving member 61 and the cylinder 71, so that the jaw opening and closing process is relaxed and stable.

[0075] like Figure 5 As shown, further, in order to better achieve the airtightness of the cavity portion 74, the cylinder 71 is sealed and connected to the sleeve 14, and a second sealing member 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, specifically a second sealing ring 72, which can be made of flexible materials such as rubber and plastic.

[0076] like Figures 5 to 7 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 closing drive member 61 a biasing force toward the distal end of the stapler. In this embodiment, the biasing member is a first compression spring 63 disposed on the proximal side of the closing drive member 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.

[0077] A second groove 412 is provided on the side 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 drive member 61, thereby realizing the linkage between the first slider 41 and the closing drive member 61. In addition, after the movement of the first slider 41 is transmitted to the closing drive 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 drive member 61.

[0078] like Figure 5As 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.

[0079] like Figures 8 to 10 FIG. 2 shows the structure of the closing drive mechanism when the stapler head is driven to close in the first embodiment. In this embodiment, in the initial state, the movable handle 3 is held, and the movable handle 3 drives the first slider 41 to move toward the distal end 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 end of the stapler through the claw 31.

[0080] When the first slider 41 moves toward the distal side of the stapler, the closing drive 61 is pulled toward the proximal side of the stapler by the pull rope 51, and the closing drive 61 compresses the first compression spring 63 to produce compression deformation. At the same time, the closing drive 61 drives the closing pull tab 12 to move toward the proximal side of the stapler to drive the nail head to close.

[0081] During the closing process of the nail head, as the distance between the distal side wall of the closing drive 61 and the distal side wall of the cylinder 71 gradually increases as the closing drive 61 moves toward the distal side, the volume of the cavity 74 surrounded by the closing drive 61 and the cylinder 71 gradually 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 closing drive 61, and the nail head can be closed normally to clamp the tissue.

[0082] like Figure 8 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 closing drive 61 through the pull rope 51 toward the proximal side of the stapler for the deformation restoring force of the first compression spring 63, the closing drive 61 is kept under the pull of the pull rope 51. Fig.10The stapler is positioned in the middle position, thereby maintaining the stability of the staple head closure during the stapler firing process.

[0083] 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.

[0084] like Fig.11 FIG. 2 shows the structure of the closing drive mechanism after the stapler is fired in the first embodiment. 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, driving 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 function of the retaining member and can move freely, and no longer applies a pulling force toward the proximal side of the stapler to the closing drive member 61. At this time, under the deformation recovery force of the first compression spring 63, the closing drive member 61 moves toward the distal side of the stapler, driving the closing pull tab 12 to move toward the distal side of the stapler to drive the stapler's nail head to open.

[0085] In the process of the stapler's nail head opening, as the closing drive 61 moves toward the distal side of the stapler, the distance between the distal side wall of the closing drive 61 and the distal side wall of the barrel 71 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 closing drive 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 closing drive 61, and the stapler's nail head slowly opens. In other alternative embodiments, the side wall of the cavity 74 can also be provided with a small air hole connected to the air, and the small air hole can only be very slowly deflated to the outside when the volume of the cavity 74 decreases, but the deflation speed of the small air hole is not as fast as the speed at which the air is compressed, so the air still produces resistance to the movement of the closing drive 61 toward the distal side.

[0086] In addition, since a first sealing ring 62 is provided between the outer wall of the closing drive 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 drive 61 toward the distal end of the anastomosis device, which is more conducive to slowing down the movement speed of the closing drive 61.

[0087] Figure 12 to Figure 15 The following are schematic diagrams of the structure of the closing drive mechanism of the second embodiment, the third embodiment, the fourth embodiment and the fifth embodiment of the present invention. The difference between these four embodiments and the first embodiment is that the piston portion 64 and the closing drive member 61 are separately provided as two interconnected parts. The piston portion 64 is located at the proximal side of the cylinder 71. The size of the piston portion 64 matches the size of the inner wall of the cylinder 71 to form a sealed connection with the cylinder 71. The shape and size of the closing drive member 61 are not limited to Fig.14 The shape and size shown in FIG. 1 only need to be sufficient to transmit the movement of the piston portion 64 to the closing pull tab 12.

[0088] like Fig.12 As shown, in the second embodiment, the closing drive member 61 is located in the cavity of the cylinder 71, and the closing drive member 61 is fixedly connected to the piston portion 64, the closing drive member 61 is connected to the pull tab 12, and the piston portion 64 is connected to the drawstring 51. The size of the closing drive member 61 can be smaller than that of the piston portion 64, so that the closing drive member 61 and the cylinder 71 are not sealed, and the side wall of the piston portion 64 and the inner wall of the cylinder 71 are sealed. The movement of the closing drive member 61 in the cavity will not affect the volume change of the cavity itself, and only the movement of the piston portion 64 toward the distal end and the proximal end of the stapler will cause the volume of the cavity to decrease and increase. The piston portion 64 can preferably be made of a flexible material or a first sealing ring 62 can be set between the piston portion 64 and the inner wall of the cylinder 71, which can not only play a sealing role, but also increase the friction force when the piston portion 64 and the cylinder 71 move relative to each other, so that the jaw opening and closing process is smooth and stable.

[0089] When the piston portion 64 moves toward the proximal side of the stapler under the action of the pull rope 51, the distance between the distal side wall of the piston portion 64 and the distal side wall of the cylinder 71 increases, the volume of the cavity portion increases, and the one-way valve 73 is opened by the force toward the proximal side. The piston portion 64 drives the closing drive member 61 to move toward the proximal side of the stapler, so as to drive the closing pull tab 12 of the stapler to move toward the proximal side of the stapler, thereby driving the stapler's nail head to close. At the same time, the piston portion 64 compresses the first compression spring 63 on the proximal side to cause deformation. When the piston portion 64 moves toward the distal end of the stapler under the deformation restoring force of the first compression spring 63, the distance between the distal side wall of the piston portion 64 and the distal side wall of the cylinder 71 decreases, and the volume of the cavity portion decreases. The one-way valve 73 is closed by the force toward the distal end, and the piston portion 64 drives the closing drive 61 to move toward the distal end of the stapler, and the closing drive 61 drives the closing pull tab 12 to move toward the distal end of the stapler to drive the stapler's nail head to open. In this process, the air in the cavity portion is compressed as the volume of the cavity portion decreases, and the movement of the piston portion 64 toward the distal end of the stapler is subject to the resistance of the compressed air, thereby slowing down the movement speed of the piston portion, so that the stapler's nail head can be slowly opened, thereby avoiding excessive force to open the jaws and damage surrounding tissues.

[0090] like Fig.13 As shown, in the third embodiment, the difference from the second embodiment is that the closing drive member 61 is located at the distal end of the cylinder 71, and the closing drive member 61 and the piston portion 64 are connected by a connecting rod 65. Since the closing drive member 61 is outside the cylinder 71, the movement of the closing drive member 61 will not affect the volume of the cavity portion. Fig.14 As shown, in the fourth embodiment, the difference from the third embodiment is that the first compression spring 63 is not arranged on the proximal side of the piston portion 64, but is arranged between the proximal side of the closing drive member 61 and the cylinder 71, and can be sleeved on the connecting rod 65. Similarly, when the piston portion 64 moves toward the proximal side, the closing drive member 61 is pulled to move toward the proximal side, and the closing drive member 61 compresses the first compression spring 63 to deform. After the pulling force of the pull rope 51 on the piston portion 64 toward the proximal side is eliminated, the closing drive member 61 moves toward the distal side under the deformation recovery force of the first compression spring 63, and drives the pull tab 12 and the piston portion 64 to move toward the distal side.

[0091] like Fig.15 FIG. 5 is a schematic diagram of the structure of the closing drive mechanism of the fifth embodiment of the present invention. Figures 12-13The difference between the two embodiments shown is that the pull tab 12 and the piston portion 64 are not coaxially arranged, and the closing drive member 61 can be fixedly connected to the side wall of the piston portion 64. In this embodiment, the working principle of the closing drive member 61 and the piston portion 64 is the same as Fig.12 and Fig.13 Based on the fifth embodiment, the cylinder 71 and the piston portion 64 can be arranged in at least two groups, the closing drive member 61 is fixedly connected to a plurality of the piston portions 64 at the same time, and a plurality of the one-way valves 73 are respectively arranged in the cavity portion 74 of each cylinder 71.

[0092] The closed drive mechanism and the medical stapler including the same provided by the present invention have the following advantages:

[0093] The present invention provides a closing drive mechanism for a medical stapler, which is additionally provided with a one-way air damping structure. When the nail head is driven to close, the one-way valve opens to connect the cavity portion with the external air, and the piston portion drives the closing drive member to move toward the proximal side of the stapler to drive the nail head to close; after the stapler is fired, the one-way valve is closed, and the movement of the piston portion toward the distal side of the stapler compresses the air in the cavity portion. The piston portion is slowed down by the resistance of the compressed air, so that the nail head can be slowly opened, thereby preventing the jaws from opening with excessive force and damaging surrounding tissues.

[0094] 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 closing drive member, a piston portion and a cylinder, the closing drive member is connected to the piston portion, the piston portion is located at the proximal end side of the cylinder, a cavity portion is formed between the inner wall of the cylinder and the piston portion, and the cavity portion is provided with a one-way valve; When the piston moves toward the proximal end of the stapler, the volume of the cavity increases, the one-way valve opens, and the piston drives the closing drive member to move toward the proximal end of the stapler to drive the stapler's nail head to close; When the piston moves toward the distal end of the stapler, the volume of the cavity decreases, the one-way valve closes, and the piston drives the closing drive member to move toward the distal end of the stapler to drive the stapler's nail head to open.

2. The closing drive mechanism according to claim 1, characterized in that: The barrel is a part of the stapler housing.

3. The closing drive mechanism according to claim 1, characterized in that: The closing drive member and the piston portion are integrally provided as a component.

4. The closing drive mechanism according to claim 1, characterized in that: A first sealing member is arranged between the outer wall of the piston portion and the inner wall of the cylinder.

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

6. 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.

7. The closing drive mechanism according to claim 1, characterized in that: The outer wall of the cylinder is provided with at least one first fixing portion, and the housing of the stapler is provided with a second fixing portion matched with the first fixing portion.

8. The closing drive mechanism according to claim 7, characterized in that: 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 The outer wall of the cylinder is provided with at least one fixing beam, and the shell of the stapler is provided with a fixing groove matched with the fixing beam.

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: Also included is a biasing member and a pull rope, wherein the biasing member and the pull rope are respectively connected to the piston portion; When the stapler head is driven to close, the pull rope pulls the piston part to move toward the proximal end of the stapler, and the biasing member is deformed; When the stapler's nail head is driven to open, the piston moves toward the distal end of the stapler under the deformation restoring force of the biasing member.

11. The closing drive mechanism according to claim 10, characterized in that: The biasing member is a compression spring disposed on the proximal end side of the piston portion.

12. The closing drive mechanism according to claim 10, 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 piston 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 piston part to move toward the proximal end of the stapler through the pull rope.

13. The closing drive mechanism according to claim 12, characterized in that: The closing drive mechanism further comprises a retaining member and an actuating rod, wherein the actuating rod comprises a pressing portion, and the initial positions of the slider and the pressing portion are both located at the proximal end side of the retaining member; In the initial state, when the movable handle is held, the movable handle drives the actuating rod to move toward the distal end of the stapler, and the pressing portion of the actuating rod presses the retaining member downward to engage with the slider; After the stapler is fired, the pressing portion of the actuating rod no longer presses the retaining member, the retaining member moves upward to disengage from the slider, and the piston portion moves toward the distal end side of the stapler under the deformation restoring force of the biasing member.

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

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