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 comprises a movable handle, a first slider, a retaining member, a steering assembly and a closing drive member, wherein the steering assembly is connected between the first slider and the closing drive member, and a groove is provided on the first slider. In the initial state, the first slider is located at the proximal side of the retaining member; when the movable handle is held, the movable handle pushes the first slider to move toward the distal side of the stapler, and the steering assembly converts the movement of the first slider toward the distal side of the stapler into the movement of the closing drive member toward the proximal side of the stapler, and the retaining member at least partially enters the groove of the first slider to hinder the movement of the first slider toward the proximal side of the stapler. By adopting the present invention, the position of the closing drive mechanism when the nail head is closed is limited by the retaining member, thereby preventing the closing pull tab from moving toward the distal side of the stapler when the stapler is fired.

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 relatively arranged. 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. 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.

[0004] The existing closing drive mechanism has a relatively complex structure, and during the firing process of the stapler, the closing pull tab may be displaced toward the distal end of the stapler, thereby affecting the closing effect between the staple cartridge and the staple anvil, and having an adverse effect on the surgical effect. Summary of the invention

[0005] In view of the problems in the prior art, the purpose of the present invention is to provide a closing drive mechanism and a medical stapler including the same, which limits the position of the closing drive mechanism when the nail head is closed by a retaining member to prevent the closing pull tab from moving toward the distal side of the stapler when the stapler is fired.

[0006] An embodiment of the present invention provides a closing drive mechanism for a medical stapler, wherein the closing drive mechanism comprises a movable handle, a first slider, a retaining member, a steering assembly and a closing drive member, wherein the steering assembly is connected between the first slider and the closing drive member, and a groove is provided on the first slider. In an initial state, the first slider is located on the proximal side of the retaining member; when the movable handle is held, the movable handle pushes the first slider to move toward the distal side of the stapler, and the steering assembly converts the movement of the first slider toward the distal side of the stapler into the movement of the closing drive member toward the proximal side of the stapler, and the retaining member at least partially enters the groove of the first slider to hinder the movement of the first slider toward the proximal side of the stapler.

[0007] Optionally, the steering assembly includes a steering support beam and a pull rope, the steering support beam is located on the proximal side of the first slider, the pull rope is sleeved on the outside of the steering support beam, and the pull rope is connected between the first slider and the closing drive member.

[0008] Optionally, the steering assembly includes a steering support beam provided with a pulley, and the pull rope is provided on the outer surface of the pulley.

[0009] Optionally, the medical stapler includes a nail head and a closing tab for closing the nail head, the closing drive is sleeved on the outside of the closing tab, and the closing drive is axially fixed to the closing tab.

[0010] Optionally, a sleeve is further sleeved on the outside of the closing pull tab, and the closing drive member is sleeved on the outside of the sleeve. The side of the sleeve is provided with a travel groove extending along the axial direction of the stapler, and a connecting pin is provided in the closing drive member. The connecting pin is inserted into the travel groove, and the connecting pin can move along the extension direction of the travel groove.

[0011] Optionally, a biasing member is provided on the proximal side of the closing drive member, and the biasing member applies a biasing force to the closing drive member toward the distal side of the stapler.

[0012] Optionally, the movable handle is connected to a connecting rod, and when the movable handle is held, the distal end side of the connecting rod pushes the first sliding block to move toward the distal end side direction of the stapler.

[0013] Optionally, the closing drive mechanism also includes an actuating rod. When the movable handle is held, the movable handle pushes the actuating rod to move toward the distal side of the stapler, and the actuating rod presses the retaining member downward so that the retaining member at least partially enters the groove of the first slider.

[0014] Optionally, a firing member is provided on the distal side of the actuating rod, and when the firing member moves toward the distal direction of the stapler, the retaining member is pressed downward so that the retaining member at least partially enters the groove of the first sliding block.

[0015] Optionally, the retaining member includes a second slider, a boss is provided on one side of the second slider, and when the movable handle is held, the boss enters into the groove of the first slider.

[0016] Optionally, the retaining member further includes a third slider, and the third slider is provided with a receiving groove for receiving the second slider.

[0017] Optionally, a fifth inclined surface is provided on the proximal side of the third sliding block, and an inclined table surface is provided on the distal side of the firing member, and the fifth inclined surface and the inclined table surface guide each other.

[0018] Optionally, a first biasing member is disposed in the accommodating groove, and the first biasing member applies a biasing force downward to the second sliding block.

[0019] Optionally, a second biasing member is disposed below the third slider, and the second biasing member applies an upward biasing force to the third slider.

[0020] Optionally, a flange is provided on one side of the actuating rod, and when the movable handle is held, the flange moves toward the distal side of the stapler until it contacts the top surface of the third slider, and presses the third slider to drive the second slider to move downward.

[0021] Optionally, in the proximal side view of the stapler, the flange and the boss of the second slider are respectively located on both sides of the actuating rod.

[0022] Optionally, the distal side surface of the first sliding block is a first inclined surface, the first inclined surface is inclined upward from its distal side to its proximal side, and the proximal side surface of the boss is a second inclined surface matching the first inclined surface.

[0023] Optionally, the proximal side surface of the groove is a third inclined surface that matches the second inclined surface, and the distal side surface of the groove and the distal side surface of the boss are both vertical surfaces.

[0024] Optionally, the retaining member includes a spring sheet, which includes a fixed end, a pressing portion and a movable end, the fixed end is fixed to the stapler, and when the actuating rod presses the pressing portion downward, the movable end enters the groove of the first slider.

[0025] Optionally, the fixed end of the spring sheet is located at the distal end side of the movable end, and the movable end is bent downward and toward the distal end side of the stapler to form a mating portion that cooperates with the groove of the first slider.

[0026] Optionally, the distal side surface of the first sliding block is a first inclined surface, the first inclined surface is inclined upward from its distal side to its proximal side, and the proximal side surface of the matching portion is a fourth inclined surface matching with the first inclined surface.

[0027] Optionally, the proximal side surface of the groove is a third inclined surface that cooperates with the fourth inclined surface, the distal side surface of the groove is a vertical surface, and the movable end of the spring sheet is formed with a vertical surface that cooperates with the distal side surface of the groove.

[0028] An embodiment of the present invention further provides a medical stapler, comprising any one of the closing drive mechanisms described above.

[0029] The closed drive mechanism and the medical stapler including the same provided by the present invention have the following advantages:

[0030] The present invention provides a closing drive mechanism for a medical stapler, which limits the position of the closing drive mechanism when the stapler head is closed by a retaining member, thereby preventing the closing pull tab from moving toward the distal side of the stapler when the stapler is fired, thereby ensuring the stability of the stapler head closure during the stapler firing process and improving the surgical effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] Figure 1 is a schematic diagram of the cooperation between the closing drive mechanism and the housing according to the first embodiment of the present invention;

[0033] Figure 2 It is a schematic structural diagram of the cooperation between the closing drive mechanism and other components of the stapler according to the first embodiment of the present invention;

[0034] Figure 3 is a three-dimensional diagram of the cooperation between the closing drive mechanism and other components of the stapler according to the first embodiment of the present invention;

[0035] Figure 4 is a schematic structural diagram of a closing drive mechanism according to a first embodiment of the present invention;

[0036] Figure 5 is a schematic diagram showing the distal side of the closing drive mechanism of the first embodiment of the present invention;

[0037] Figure 6 is a schematic diagram of the cooperation between the first slider and the retaining member of the first embodiment of the present invention;

[0038] Figure 7 is a schematic structural diagram of a retaining member according to a first embodiment of the present invention;

[0039] Figure 8 is a schematic structural diagram of a first sliding block according to a first embodiment of the present invention;

[0040] Fig. 9 is a rear view of the actuating rod of the first embodiment of the present invention;

[0041] Fig.10 is a schematic diagram of the cooperation between the closing drive mechanism and the housing according to the second embodiment of the present invention;

[0042] Fig.11 is a three-dimensional diagram of the cooperation between the closing drive mechanism and other components of the stapler according to the second embodiment of the present invention;

[0043] Fig.12 is a schematic structural diagram of a closing drive mechanism according to a second embodiment of the present invention;

[0044] Fig.13 It is a schematic diagram of the cooperation between the retaining member and the first sliding block according to the second embodiment of the present invention.

[0045] Reference numerals:

[0046] 1 Stapler body 61 First compression spring

[0047] 11 Fixed handle 62 Second compression spring

[0048] 12 Casing 7 Shrapnel

[0049] 121 Travel slot 71 Fixed end

[0050] 13 pull tab 72 pressing portion

[0051] 2 Shell 73 Rope passing slot

[0052] 3 Movable handle 74 Fourth inclined surface

[0053] 31 claw 75 movable end

[0054] 4 Connecting rod 76 Sixth inclined surface

[0055] 51 first slide block 8 actuating rod

[0056] 511 first groove 81 propulsion tooth

[0057] 512 second groove 82 rack

[0058] 513 first inclined surface 83 firing member

[0059] 514 third slope 831 sloped surface

[0060] 52 second slider 84 flange

[0061] 521 boss 841 flange slope

[0062] 522 Second slope 91 Pull rope

[0063] 53 third slider 92 pulley

[0064] 531 accommodating groove 93 closing driving member

[0065] 532 top surface 94 third compression spring

[0066] 535 fifth inclined surface 95 connecting pin DETAILED DESCRIPTION

[0067] 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.

[0068] 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 includes a movable handle, a first slider, a retainer, a steering assembly and a closing drive member. The steering assembly is connected between the first slider and the closing drive member, and a groove is provided on the first slider. In an initial state, the first slider is located at the proximal side of the retainer; when the movable handle is held, the movable handle pushes the first slider to move toward the distal side of the stapler, and the steering assembly converts the movement of the first slider toward the distal side of the stapler into the movement of the closing drive member toward the proximal side of the stapler, and the closing drive member pulls the closing pull tab to move toward the proximal side of the stapler to close the stapler head, and at this time, the retainer at least partially enters the groove of the first slider to hinder the movement of the first slider toward the proximal side of the stapler. When the surgeon has checked the tissues to be stapled and confirmed that the stapler can be fired, the surgeon switches the stapler to a fireable state. When the surgeon holds the movable handle again, the stapler can be fired. Furthermore, since the first slider does not move toward the proximal end of the stapler and the closing drive does not provide the closing pull tab with a driving force toward the distal end of the stapler, the stapler head can be kept closed.

[0069] Combine the following Figures 1 to 13The structure of a closed drive mechanism and a medical stapler according to an embodiment of the present invention is described. Figures 1 to 9 FIG. 4 shows the structure of the closing drive mechanism and the medical stapler of the first embodiment of the present invention. Figures 10 to 13 The structure of the closing drive mechanism and the medical stapler of the second embodiment of the present invention is shown, wherein the retaining member structure of the first embodiment is different from that of the second embodiment.

[0070] like Figures 1 to 9 As shown, in the first embodiment of the present invention, the stapler includes a stapler body 1 and a stapler head (not shown in the figure) located at the distal end of the stapler body 1, the stapler body 1 includes a housing 2 and a fixed handle 11, and a closing pull tab 13 for closing and opening the stapler head is also provided inside the stapler body 1, and a sleeve 12 is provided outside the closing pull tab 13. The closing drive mechanism includes a movable handle 3 rotatably connected to the stapler body 1, a first slider 51 located inside the stapler body 1, a retainer, a steering assembly, a firing member 83, and a closing drive member 93 connected to the closing pull tab 13, the steering assembly is connected between the first slider 51 and the closing drive member 93, and a first groove 511 is provided on the first slider 51. In the initial state, the first slider 51 is located at the proximal side of the holder; when the movable handle 3 is held, the movable handle 3 pushes the first slider 51 to move toward the distal side of the stapler, and the steering assembly converts the movement of the first slider 51 toward the distal side of the stapler into the movement of the closing drive 93 toward the proximal side of the stapler, and the closing drive 93 pulls the closing pull tab 13 toward the proximal side of the stapler to close the stapler head, and at this time, the holder at least partially enters the first groove 511 of the first slider 51 to hinder the movement of the first slider 51 toward the proximal side of the stapler. When switching to the firing mode, when the movable handle 3 is held again, the stapler can be fired, and since the first slider 51 is hindered by the holder, it will not move toward the proximal side of the stapler, and the closing drive 93 will not give the closing pull tab 13 a driving force toward the distal side of the stapler, so that the stapler head can be kept closed. For a component, its outer side refers to the side away from the axis of the stapler, and its inner side refers to the side close to the axis of the stapler.

[0071] 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. Figure 1 In the perspective of the figure, the distal end of the stapler body 1 is the left end in the figure, and the right end of the stapler body 1 is the right end in the figure. The axial direction of the medical stapler refers to the direction from the proximal end of the medical stapler to the distal end, that is, Figure 1The extending direction of the middle sleeve 12.

[0072] In this embodiment, the steering assembly includes a steering support beam 92 and a pull rope 91. The steering support beam 92 is fixed to the housing 2. In a preferred embodiment, the steering support beam 92 is configured as a pulley 92 to reduce the resistance of the pull rope 91 when it moves. The pulley 92 is located at the proximal side of the first slider 51. The pull rope 91 is sleeved on the outside of the pulley 92, and the pull rope 91 is connected between the first slider 51 and the closed driving member 93. In a preferred embodiment, fixed ends are respectively provided at both ends of the pull rope 91. A second groove 512 may be provided at the proximal side of the first slider 51, and one fixed end of the pull rope 91 may be detachably installed in the second groove 512. The other fixed end of the pull rope 91 may be detachably connected to the closed driving member 93. Through the structure of the pull rope 91 and the pulley 92, the movement of the first slider 51 can be converted into a reverse driving force and transmitted to the closed driving member 93, so that the closed driving member 93 moves toward the proximal section.

[0073] In this embodiment, the closing drive member 93 is a sleeve sleeved on the outside of the closing pull tab 13, and the closing drive member 93 is axially fixed with the closing pull tab 13. Here, axial fixation means that there is no relative movement between the closing drive member 93 and the closing pull tab 13 along the axial direction of the stapler. If the closing drive member 93 moves axially toward the proximal side or the distal side of the stapler, the closing pull tab 13 and the closing drive member 93 are linked. Further, the closing drive member 93 is sleeved on the outside of the sleeve 12, and the side of the sleeve 12 is provided with a travel groove 121 extending along the axial direction of the stapler. The closing drive member 93 is provided with a connecting pin 95, which is inserted into the travel groove 121 and can move along the extension direction of the travel groove 121. The travel groove 121 communicates with the inner side and the outer side of the sleeve 12, and the connecting pin 95 is a through pin. The closing drive member 93 is fixedly connected to the closing pull tab 13 through the connecting pin 95, and the movement of the connecting pin 95 in the travel groove 12 of the sleeve 12 provides a guide for the axial movement of the closing drive member 93. The closing drive member 93 and the sleeve 12 are circumferentially fixed by the connecting pin 95, that is, the closing drive member 93 can rotate with the rotation of the sleeve 12 around the axis.

[0074] A biasing member is provided on the proximal side of the closing drive member 93, and the biasing member gives the closing drive member 93 a biasing force toward the distal side of the stapler. In this embodiment, the biasing member is a third compression spring 94. When the movable handle 3 is held to close the stapler head, the closing drive member 93 moves toward the proximal side of the stapler to compress the third compression spring 94. When the stapler is reset after firing, the deformation recovery force of the third compression spring 94 can push the closing drive member 93 to move toward the distal side of the stapler and return to the initial position, and can open the stapler head.

[0075] In this embodiment, the movable handle 3 is connected to a connecting rod 4. When the movable handle 3 is held, the distal end of the connecting rod 4 pushes the first sliding block 51 to move toward the distal end of the stapler.

[0076] like Figure 2 As shown, the closing drive mechanism also includes an actuating rod 8 for firing the stapler. A propelling tooth 81 is provided at the distal end of the actuating rod 8, and a rack 82 is provided at the proximal end of the propelling tooth 81. A firing piece 83 is movably connected to the distal end of the actuating rod 8. The firing piece 83 can rotate 360° relative to other parts of the actuating rod 8, and the firing piece 83 is sleeved and fixedly connected to the sleeve 12. An inclined table 831 is provided circumferentially at the distal end of the firing piece 83. There is also a claw 31 on the movable handle 3. When the movable handle 3 is held for the first time, the claw 31 of the movable handle 3 pushes the propelling tooth 81 of the actuating rod 8, so that the actuating rod 8 moves toward the distal end of the stapler, and the inclined table 831 of the firing piece 83 gradually approaches and contacts the retainer, and presses the retainer downward, so that the retainer at least partially enters the first groove 511 of the first slider 51. At this time, the claw 31 is located at a position corresponding to the rack 82 and switches to the firing mode. When the movable handle 3 is held again, the claw 31 pushes the rack 82 of the actuating rod 8, so that the actuating rod 8 continues to move toward the distal side of the stapler, and the actuating rod 8 pushes the firing piece 83 on the distal side of the actuating rod 8 to fire the stapler.

[0077] like Figures 4 to 7As shown, in this embodiment, the retaining member includes a second slider 52, and a boss 521 is provided on one side of the second slider 52. When the movable handle 3 is held, the firing member moves toward the distal side to the top of the retaining member, pressing the retaining member downward. At the same time, the first slider 51 moves toward the distal side, at least part of the boss 521 is below, so that the boss 521 enters the first groove 511 of the first slider 51. Further, the retaining member also includes a third slider 53, and the third slider 53 is provided with a receiving groove 531 for accommodating the second slider 52. A first biasing member is provided in the receiving groove 531, and the first biasing member gives the second slider 52 a biasing force toward the bottom. A second biasing member is provided below the third slider 53, and the second biasing member gives the third slider 53 a biasing force toward the top. In this embodiment, the first biasing member is a first compression spring 61, and the second biasing member is a second compression spring 62. Specifically, a first biasing member hole is provided on one side of the second slider 52 close to the first biasing member, and one end of the first biasing member is provided in the first biasing member hole; a second biasing member hole is provided on one end of the third slider 53 close to the second biasing member, and one end of the second biasing member is provided in the second biasing member hole, so as to ensure the stability of the second slider 52 and the third slider 53 in perpendicular to the axial movement.

[0078] like Figure 6 and Figure 7 The figure shows a schematic diagram of the boss 521 entering the first groove 511. When the movable handle 3 is held for the first time, the actuating rod 8 and the first slider 51 both move toward the distal end of the stapler, and the first groove 511 of the first slider 51 moves to the bottom of the boss 521. The firing rod 83 presses the third slider 53 to move downward, and presses the second compression spring 62, and the third slider 53 moves downward. When the first slider 51 lifts the second slider 52 upward, the first compression spring is compressed. After the boss 521 of the second slider 52 moves downward into the first groove 511, the second slider 52 is kept in the first groove 511 under the action of the first compression spring 61. When the stapler is reset after firing, the actuator rod 8 moves toward the proximal side of the stapler and returns to its initial position. The third slider 53 is no longer subjected to the compressive force of the firing member 83. The third slider 53 and the second slider 52 return to their initial positions under the action of the deformation restoring force of the first compression spring 61 and the second compression spring 62. Under the action of the third compression spring, the closing drive member 93 moves toward the distal side under the action of the third compression spring, and the first slider 51 is driven by the pull rope 91 to move toward the proximal side of the stapler and return to its initial position.

[0079] In this embodiment, a flange 84 may be further provided on one side of the actuating rod 8. When the movable handle 3 is held, the flange 84 moves toward the distal side of the stapler until it contacts the top surface 532 of the third slider 53, and presses the third slider 53 to move downward, so that the boss 521 of the second slider 52 enters the first groove 511 of the first slider 51. The flange 84 pressing the third slider 53 and the firing member 83 pressing the third slider 53 described above can be used as two interchangeable implementations. In the proximal side view of the stapler, the flange 84 and the boss 521 of the second slider 52 are respectively located on both sides of the actuating rod 8. That is, Figure 3 In the perspective of looking from the right end surface in the axial direction, the flange 84 is located on the right side of the actuating rod 8, and the boss 521 is located on the left side of the actuating rod 8. Fig. 9 As shown, corresponding to the fifth inclined surface 535 of the third sliding block 53 , the lower end surface of the flange 84 is also provided with a flange inclined surface 841 matching with the fifth inclined surface 535 to guide the third sliding block 53 .

[0080] In this embodiment, the distal side surface of the first slider 51 is a first inclined surface 513, which is inclined upward from the distal side to the proximal side, and the proximal side surface of the boss 521 is a second inclined surface 522 that matches the first inclined surface 513. The cooperation between the first inclined surface 513 and the second inclined surface 522 can better guide the boss 521 to enter the first slider 51.

[0081] In this embodiment, the proximal side surface of the first groove 511 is a third inclined surface 514 that cooperates with the second inclined surface 522, and the distal side surface of the first groove 511 and the distal side surface of the boss 521 are both vertical surfaces. That is, the first groove 511 is a structure that is adapted to the shape of the boss 521. In addition, through the cooperation of the two vertical surfaces of the distal side surface of the first groove 511 and the distal side surface of the boss 521, when the boss 521 is located in the first groove 511, the boss 521 is prevented from being separated from the distal side of the first slider 51.

[0082] like Figures 10 to 13, which is a schematic diagram of the structure of the closing drive mechanism and the stapler of the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the structure of the retainer is different. In this embodiment, the retainer includes a spring sheet 7, and the spring sheet 7 includes a fixed end 71, a pressing portion 72 and a movable end 75. The fixed end 71 is fixed to the stapler. When the movable handle 3 is held for the first time, the firing member 83 moves toward the distal side of the stapler, and the firing member 83 presses the pressing portion 72 downward. The movable end 75 moves downward into the first groove 511 of the first slider 51, and the spring sheet 7 is deformed to hinder the movement of the first slider 51 toward the proximal side of the stapler. After the stapler is fired, the actuating rod 8 moves toward the proximal side of the stapler and returns to the initial position, and the firing member 83 no longer presses the pressing portion 72. Under the action of the deformation recovery force of the spring sheet 7, the movable end 75 moves upward and separates from the first groove 511, and the first slider 51 can move toward the proximal side of the stapler and return to the initial position.

[0083] A pull rope passing slot 73 is also provided at the position where the spring piece 7 cooperates with the pull rope 91 , and the pull rope 91 can pass through the pull rope passing slot 73 and move axially in the pull rope passing slot 73 .

[0084] In this embodiment, the fixed end 71 of the spring piece 7 is located at the distal side of the movable end 75, and the movable end 75 is bent downward and toward the distal side of the stapler to form a matching portion that matches the first groove 511 of the first slider 51. The distal side surface of the first slider 51 is a first inclined surface 513, and the first inclined surface 513 is inclined upward from its distal side to the proximal side, and the proximal side surface of the matching portion is a fourth inclined surface 74 that matches the first inclined surface 513. The cooperation between the first inclined surface 513 and the fourth inclined surface 74 can better guide the matching portion of the spring piece 7 to enter the first groove 511. Corresponding to the inclined surface 831 of the firing member 83, a sixth inclined surface 76 is also formed on the proximal side surface of the spring piece 7, and the sixth inclined surface 76 and the inclined surface 831 of the firing member 83 guide each other. This embodiment can also be used with Fig. 9 The flange 84 shown in the figure cooperates with the sixth inclined surface 76, that is, the flange inclined surface 841 and the sixth inclined surface 76 guide each other.

[0085] In this embodiment, the proximal side surface of the first groove 511 is a third inclined surface that matches the fourth inclined surface 74, the distal side surface of the first groove 511 is a vertical surface, and the movable end 74 of the spring piece 7 is formed with a vertical surface that matches the distal side surface of the first groove 511. Through the cooperation of the two vertical surfaces of the movable end 74 of the spring piece 7 and the distal side surface of the first groove 511, when the movable end 74 enters the first groove 511, it can be prevented from being separated from the distal side of the first groove 511.

[0086] The closed drive mechanism and the medical stapler including the same provided by the present invention have the following advantages:

[0087] The present invention provides a closing drive mechanism for a medical stapler, which limits the position of the closing drive mechanism when the stapler head is closed by a retaining member, thereby preventing the closing pull tab from moving toward the distal side of the stapler when the stapler is fired, thereby ensuring the stability of the stapler head closure during the stapler firing process and improving the surgical effect.

[0088] 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: Used in a medical stapler, the closing drive mechanism comprises a movable handle, a first slider, a retaining member, a steering assembly and a closing drive member, the steering assembly is connected between the first slider and the closing drive member, the steering assembly comprises a pulley and a drawstring, the pulley is located at the proximal side of the first slider, the drawstring is sleeved on the outside of the pulley, and the drawstring is connected between the first slider and the closing drive member, the first slider is provided with a groove, and in an initial state, the first slider is located at the proximal side of the retaining member; When holding the movable handle, the movable handle pushes the first slider to move toward the distal side of the stapler, and the steering assembly converts the movement of the first slider toward the distal side of the stapler into the movement of the closing drive member toward the proximal side of the stapler. The retaining member at least partially enters the groove of the first slider to hinder the movement of the first slider toward the proximal side of the stapler.

2. The closing drive mechanism according to claim 1, characterized in that: The medical stapler comprises a nail head and a closing pull tab for closing the nail head, the closing drive is sleeved on the outside of the closing pull tab, and the closing drive is axially fixed to the closing pull tab.

3. The closing drive mechanism according to claim 2, characterized in that: The outside of the closing pull tab is also sleeved with a sleeve, and the closing drive member is sleeved on the outside of the sleeve. The side of the sleeve is provided with a travel groove extending along the axial direction of the stapler. A connecting pin is provided in the closing drive member, and the connecting pin is inserted into the travel groove, and the connecting pin can move along the extension direction of the travel groove.

4. The closing drive mechanism according to claim 1, characterized in that: A biasing member is disposed on the proximal side of the closing drive member, and the biasing member applies a biasing force to the closing drive member in the direction of the distal side of the stapler.

5. The closing drive mechanism according to claim 1, characterized in that: The movable handle is connected to a connecting rod. When the movable handle is held, the distal end of the connecting rod pushes the first sliding block to move toward the distal end of the stapler.

6. The closing drive mechanism according to claim 1, characterized in that: The closing drive mechanism also includes an actuating rod. When the movable handle is held, the movable handle pushes the actuating rod to move toward the distal side of the stapler, and the actuating rod presses the retaining member downward so that the retaining member at least partially enters the groove of the first slider.

7. The closing drive mechanism according to claim 6, characterized in that: A firing member is provided on the distal end side of the actuating rod. When the firing member moves toward the distal end of the stapler, it presses the retaining member downward so that the retaining member at least partially enters the groove of the first sliding block.

8. The closing drive mechanism according to claim 6, characterized in that: The retaining member comprises a second sliding block, a boss is arranged on one side of the second sliding block, and when the movable handle is held, the boss enters into the groove of the first sliding block.

9. The closing drive mechanism according to claim 8, characterized in that: The retaining member further comprises a third sliding block, and the third sliding block is provided with a receiving groove for receiving the second sliding block.

10. The closing drive mechanism according to claim 9, characterized in that: A firing piece is provided on the distal side of the actuating rod, and when the firing piece moves toward the distal direction of the stapler, the retaining piece is pressed downward so that the retaining piece at least partially enters the groove of the first slider; a fifth inclined surface is provided on the proximal side of the third slider, and an inclined table surface is provided on the distal side of the firing piece, and the fifth inclined surface and the inclined table surface guide each other.

11. The closing drive mechanism according to claim 9, characterized in that: A first biasing member is disposed in the accommodating groove, and the first biasing member applies a biasing force downward to the second sliding block.

12. The closing drive mechanism according to claim 9, characterized in that: A second biasing member is disposed below the third sliding block, and the second biasing member applies a biasing force upward to the third sliding block.

13. The closing drive mechanism according to claim 9, characterized in that: A flange is provided on one side of the actuating rod. When the movable handle is held, the flange moves toward the distal end of the stapler until it contacts the top surface of the third slider and presses the third slider to move downward.

14. The closing drive mechanism according to claim 13, characterized in that: In the proximal side view of the stapler, the flange and the boss of the second slider are respectively located on both sides of the actuating rod.

15. The closing drive mechanism according to claim 8, characterized in that: The distal side surface of the first sliding block is a first inclined surface, and the first inclined surface is inclined upward from the distal side to the proximal side thereof, and the proximal side surface of the boss is a second inclined surface matched with the first inclined surface.

16. The closing drive mechanism according to claim 15, characterized in that: The proximal side surface of the groove is a third inclined surface matched with the second inclined surface, and the distal side surface of the groove and the distal side surface of the boss are both vertical surfaces.

17. The closing drive mechanism according to claim 7, characterized in that: The retaining member includes a spring sheet, which includes a fixed end, a pressing portion and a movable end. The fixed end is fixed to the stapler, and when the actuating rod presses the pressing portion downward, the movable end enters the groove of the first slider.

18. The closing drive mechanism according to claim 17, characterized in that: The fixed end of the spring sheet is located at the distal end side of the movable end, and the movable end is bent downward and toward the distal end side direction of the stapler to form a matching portion that matches with the groove of the first slider.

19. The closing drive mechanism according to claim 18, characterized in that: The distal side surface of the first sliding block is a first inclined surface, and the first inclined surface is inclined upward from the distal side to the proximal side thereof, and the proximal side surface of the matching portion is a fourth inclined surface matching with the first inclined surface.

20. The closing drive mechanism according to claim 19, characterized in that: The proximal side surface of the groove is a third inclined surface matched with the fourth inclined surface, the distal side surface of the groove is a vertical surface, and the movable end of the spring sheet is formed with a vertical surface matched with the distal side surface of the groove.

21. A medical stapler, characterized in that: The invention comprises the closing drive mechanism according to any one of claims 1 to 20.

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