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 closing drive member and an actuating rod, wherein the initial position of at least part of the structure of the first slider is located on the proximal side of the retaining member, and the actuating rod is provided with a pressing portion and a yielding portion, wherein the initial positions of the pressing portion and the yielding portion of the actuating rod are both located on the proximal side of the retaining member, and when the movable handle is held in the initial state, the first slider moves toward the distal side and engages with the retaining member, and after the stapler is fired, the retaining member automatically disengages from the first slider. The present invention limits the position of the closing drive member when the nail head is closed by engaging the retaining member and the first slider, thereby preventing the closing pull tab from moving toward the distal side of the stapler when the stapler is fired, and after the stapler is fired, the retaining member no longer limits the position of the closing drive member, and the nail magazine and the nail anvil can be automatically opened.

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 stapler magazine and a staple anvil that are arranged opposite to each other. During surgery, the movable handle is first held, and the closing pull tab of the stapler head is pulled toward the proximal side of the stapler through the closing drive mechanism, so that the stapler magazine and the staple anvil 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 stapler magazine being formed at the stapler anvil assembly. At the same time, the cutter moves from the proximal side of the stapler to the distal side to cut the tissue. 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 closed drive mechanism has a relatively complex structure, and during the process of firing the stapler, the closing pull tab may be displaced toward the distal side of the stapler, which affects the closing effect between the stapler magazine and the anvil, and has an adverse effect on the surgical effect. In addition, in the existing closed drive mechanism, after the stapler is fired, the stapler magazine and the anvil remain closed. After the doctor has completed the operation of the stapler, an additional operation step is required to open the stapler magazine and the anvil. Moreover, after the stapler is fired, the doctor needs to pull back the pusher rod so that the cutter returns to the initial position along the cutter groove. During the process of pulling back the cutter, if the stapler magazine and the anvil remain closed, the cutter will be subject to the resistance of the tissue between the stapler magazine and the anvil and will not be able to return smoothly to the initial position. 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, wherein the position of the closing drive member when the nail head is closed is limited by the engagement of the retaining member and the first sliding block, thereby preventing the closing pull tab from moving toward the distal side of the stapler when the stapler is fired, and after the stapler is fired, the retaining member no longer limits the position of the closing drive member, and the staple magazine and the staple anvil can be automatically opened.

[0006] An embodiment of the present invention provides a closing drive mechanism for a medical stapler, the closing drive mechanism comprising a movable handle, a first slider, a retaining member, a closing drive member and an actuating rod, the initial position of at least a part of the structure of the first slider is located at the proximal side of the retaining member, the actuating rod is provided with a pressing portion and a yielding portion, and the initial positions of the pressing portion and the yielding portion of the actuating rod are both located at the proximal side of the retaining member;

[0007] When the movable handle is held in the initial state, under the action of the movable handle, the first slider moves toward the distal end of the stapler to below the retaining member, and drives the closing drive member to close the stapler head of the stapler, and the pressing portion of the actuating rod moves toward the distal end of the stapler and presses the retaining member downward, and the retaining member is engaged with the first slider;

[0008] When the stapler is fired, the yielding portion of the actuating rod moves to above the retaining member, the retaining member moves upward and at least partially enters the yielding portion, and the retaining member is disengaged from the first sliding block.

[0009] Optionally, a groove is provided on the upper surface of the first slider, and in the initial position, the groove is located at the proximal side of the retaining member, and when the movable handle is held in the initial state, the retaining member at least partially enters the groove of the first slider; or

[0010] The retaining member is provided with an upwardly recessed groove, and when the movable handle is held in an initial state, the first sliding block at least partially enters the recess of the retaining member.

[0011] Optionally, the pressing portion of the actuating rod is a flange arranged on the distal end side of the actuating rod, and the yielding portion is recessed upward relative to the flange.

[0012] Optionally, the distal side surface of the flange is a first slope of the flange that slopes upward from its proximal side edge to the distal side edge, and the proximal side surface of the retaining member is a first slope of the retaining member that matches the first slope of the flange.

[0013] Optionally, the evacuation portion is a evacuation groove formed in the flange.

[0014] Optionally, the distal side surface of the clearance groove is a second inclined surface of the flange that is inclined upward from its distal side edge to the proximal side edge, and the distal side surface of the retaining member is a second inclined surface of the retaining member that matches the second inclined surface of the flange.

[0015] Optionally, the relief portion is formed between the proximal end side of the flange and the actuating rod.

[0016] Optionally, the proximal side surface of the flange is a second inclined surface of the flange that is inclined upward from its distal side edge to the proximal side edge, and the distal side surface of the retaining member is a second inclined surface of the retaining member that matches the second inclined surface of the flange.

[0017] Optionally, a groove is provided on the upper surface of the first slider, and the retaining member includes a second slider and a third slider, the third slider is provided with a receiving groove for accommodating the second slider, and a boss is provided on one side of the second slider, and when the movable handle is held in the initial state, the boss of the second slider moves downward and at least partially enters the groove of the first slider.

[0018] Optionally, a first biasing member is disposed below the third slider, and the first biasing member applies an upward biasing force to the third slider.

[0019] Optionally, a groove is provided on the upper surface of the first slider, and the retaining member includes a spring sheet, which includes a fixed end and a movable end. The fixed end of the spring sheet is located on the distal side of the movable end, and the movable end forms a mating portion that cooperates with the groove of the first slider. When the pressing portion of the actuating rod presses the spring sheet downward, the mating portion at least partially enters the groove of the first slider.

[0020] An embodiment of the present invention further provides a medical stapler, comprising the above-mentioned closing drive mechanism.

[0021] The closed drive mechanism and the medical stapler including the same provided by the present invention have the following advantages:

[0022] The present invention provides a closing drive mechanism for a medical stapler. Before the stapler is fired, after the stapler head is closed by the closing drive, the position of the closing drive is limited by the engagement of a retaining member and a first slider, so as to prevent the closing pull tab from moving toward the distal end side of the stapler when the stapler is fired. After the stapler is fired, the retaining member moves upward and disengages from the first slider, and no longer limits the position of the closing drive, so that the closing drive can return to the initial position, so that the stapler magazine and the stapler anvil can be automatically opened, thereby reducing the doctor's operating steps for the stapler, and the cutter can be pulled back very smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] 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;

[0025] Figure 2 yes Figure 1 A schematic diagram of the structure in which the stapler housing is removed;

[0026] Figure 3 is a schematic diagram of the positions of the first slider and the retaining member in the initial state of the first embodiment of the present invention;

[0027] Figure 4 is a structural schematic diagram of the closing drive mechanism in the initial state of the first embodiment of the present invention;

[0028] Figure 5 yes Figure 4 A1 in the middle is an enlarged view;

[0029] Figure 6 is a schematic diagram of a partial structure of the stapler after the movable handle is grasped once in the initial state of the first embodiment of the present invention;

[0030] Figure 7 is a structural schematic diagram of the closing drive mechanism after the movable handle is gripped once in the initial state of the first embodiment of the present invention;

[0031] Figure 8 yes Figure 7 A2 in the middle is an enlarged view;

[0032] Fig. 9 is a schematic diagram of the cooperation between the first sliding block and the retaining member after the movable handle is gripped once in the initial state of the first embodiment of the present invention;

[0033] Fig.10 is a schematic structural diagram of a retaining member according to a first embodiment of the present invention;

[0034] Fig.11 is a schematic diagram of a partial structure of the stapler when the stapler of the first embodiment of the present invention is fired;

[0035] Fig.12 is a schematic structural diagram of the closing drive mechanism of the stapler of the first embodiment of the present invention when firing is completed;

[0036] Fig.13 yes Fig.12 A3 in the middle is an enlarged view;

[0037] Fig.14is a structural schematic diagram of the positions of the first slider and the retaining member when the stapler of the first embodiment of the present invention is fired;

[0038] Fig.15 is a schematic structural diagram of a closing drive mechanism according to a second embodiment of the present invention;

[0039] Fig.16 Schematic diagram of the structure of the first slider and the retaining member positions of the second embodiment of the present invention.

[0040] Reference numerals:

[0041] 1 Stapler body 6 Second slider

[0042] 11 Fixed handle 61 Boss

[0043] 12 pull tab 62 second slider slope

[0044] 13 Shell 63 Second stop surface

[0045] 2 Actuating rod 7 Third slide block

[0046] 21 Propelling tooth 71 Accommodating groove

[0047] 22 rack 72 third slider first inclined surface

[0048] 23 flange 73 third slider second inclined surface

[0049] 24 flange first inclined surface 74 first compression spring

[0050] 25 flange second inclined surface 75 second compression spring

[0051] 26 clearance slot 81 pull rope

[0052] 27 Firing piece 82 Steering support beam

[0053] 3 Movable handle 83 Closing drive

[0054] 31 claw 84 third compression spring

[0055] 4 Connecting rod 9 Shrapnel

[0056] 5 First slider 91 Fixed end

[0057] 51 first groove 92 movable end

[0058] 52 Second groove 93 Pull rope passes through groove

[0059] 53 first inclined surface of first sliding block 94 first inclined surface of spring piece

[0060] 54 first slider second inclined surface 95 spring sheet second inclined surface

[0061] 55 first stop surface 96 spring sheet third inclined surface DETAILED DESCRIPTION

[0062] 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.

[0063] 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 movable handle, a first slider, a retaining member, a closing drive member and an actuating rod, the initial position of the first slider is located at the proximal side of the retaining member, and the actuating rod is provided with a pressing portion and a yielding portion, and the initial positions of the pressing portion and the yielding portion of the actuating rod are both located at the proximal side of the retaining member. When the movable handle is held in the initial state, under the action of the movable handle, the first slider moves toward the distal side of the stapler to the bottom of the retaining member, and drives the closing drive member to close the stapler's nail head by pulling the closing pull tab of the stapler. Similarly, under the action of the movable handle, the pressing portion of the actuating rod moves toward the distal side of the stapler and presses the retaining member downward, and the retaining member is engaged with the first slider to limit the movement of the first slider toward the proximal side of the stapler, thereby ensuring that the closing pull tab will not move toward the distal side of the stapler during the firing process of the stapler, thereby ensuring the stability of the closure of the stapler head.

[0064] When the stapler is fired, the yielding portion moves toward the distal end along with the actuating rod to above the retaining member, and the retaining member moves upward and at least partially enters the yielding portion, so that the retaining member is disengaged from the first slider to no longer restrict the position of the closing drive member. The closing drive member can return to the initial position, and then drive the closing pull tab to move toward the distal end of the stapler, so that the stapler magazine and the stapler anvil can be automatically opened, reducing the doctor's operating steps for the stapler, and the cutter can be pulled back very smoothly.

[0065] The present invention also provides a medical stapler including the closed drive mechanism. By adopting the closed drive mechanism of this structure, the stability of the closure of the stapler head during the firing process of the stapler can be ensured, and the stapler head can be automatically opened after the firing of the stapler is completed.

[0066] Combine the following Figures 1 to 16 The structures of the closing drive mechanism and the stapler in the specific implementation manner of the present invention are specifically introduced. Figures 1 to 14 The structure of the closing drive mechanism and the stapler of the first embodiment of the present invention is shown. Fig.15 and Fig.16 The structure of the closed drive mechanism and the stapler of the second embodiment of the present invention is shown. The retainer structure of the first embodiment is different from that of the second embodiment. It is understandable that the specific structures of the two embodiments here are only for illustrating the specific implementation of the present invention, and are not intended to limit the protection scope of the present invention.

[0067] like Figures 1 to 14 As shown, in the first embodiment of the present invention, 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 shell 13 and a fixed handle 11. The stapler body 1 is also provided with a closing pull tab 12 for closing and opening the nail head. 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. The closing drive mechanism includes a movable handle 3, a first slider 5, a retainer, a closing drive member 83 and an actuating rod 2. The closing drive member 83 is connected to the closing pull tab 12. When the closing drive member 83 moves toward the proximal end of the stapler, the closing pull tab 12 is pulled toward the proximal end of the stapler to close the nail head of the stapler.

[0068] like Figures 1 to 5 The structure of the stapler and the closed driving structure in the initial state of this embodiment is shown. In this embodiment, in the initial state, the first slider 5 and the actuating rod 2 are both located at the initial position, the initial position of the first slider 5 is located at the proximal side of the retaining member, and the actuating rod 2 is provided with a pressing portion, and the initial position of the pressing portion of the actuating rod 2 is located at the proximal side of the retaining member. Figure 3 As shown, the retaining member includes a second slider 6 and a third slider 7, and the third slider 7 is provided with a receiving groove 71 for receiving the second slider 6. Figure 4 and Figure 5 As shown, the pressing portion of the actuating rod 2 is a flange 23 disposed on the distal end side of the actuating rod 2 .

[0069] 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, toward the side away from the rack 22, and the lower or downward direction is opposite to it. For example, in Figure 1 and Figure 2 In the perspective of FIG, the distal end of the stapler body 1 is the left end in the figure, the proximal end of the stapler body 1 is the right end in the figure, and the upward direction refers to the upper end in the figure. Figure 4 In the perspective of Figure 1 and Figure 2 The perspective reversal, in Figure 4 In the embodiment, the distal end side of the actuating rod 2 is Figure 4 The right side of the actuating rod 2, the proximal side of the actuating rod 2 is Figure 4 The left side of the middle actuating rod 2.

[0070] When the movable handle 3 is held in the initial state, the rotation of the movable handle 3 drives the connecting rod 4 to move toward the distal side of the stapler, thereby causing the connecting rod 4 to push the first slider 5 to move toward the distal side of the stapler to below the retaining member. The first slider 5 is connected to the closing drive member 83 via a steering assembly, which converts the movement of the first slider 5 toward the distal side of the stapler into the movement of the closing drive member 83 toward the proximal side of the stapler, thereby pulling the pull tab 12 to move toward the proximal side of the stapler, thereby closing the stapler head of the stapler.

[0071] In this embodiment, the steering assembly includes a steering support beam 82 and a pull rope 81. The steering support beam 82 is fixed to the housing 13. In a preferred embodiment, the steering support beam 82 is configured as a pulley 82 to reduce the resistance of the pull rope 81 when it moves. The pulley 82 is located at the proximal side of the first slider 5. The pull rope 81 is sleeved on the outside of the pulley 82, and the pull rope 81 is connected between the first slider 5 and the closed driving member 83. In a preferred embodiment, fixed ends are provided at both ends of the pull rope 81. The proximal side of the first slider 5 may be provided with a second groove 52, and one fixed end of the pull rope 81 may be detachably installed in the second groove 52. The other fixed end of the pull rope 81 may be detachably connected to the closed driving member 83. Through the structure of the pull rope 81 and the pulley 82, the movement of the first slider 5 can be converted into a reverse driving force and transmitted to the closed driving member 83, so that the closed driving member 83 moves toward the proximal side.

[0072] At the same time, when the movable handle 3 is held in the initial state, the movable handle 3 rotates while being held, and the claw 31 on the movable handle 3 contacts the pushing tooth 21 on the actuating rod 2 and pushes the pushing tooth 21 toward the distal end of the stapler, so that the actuating rod 2 also moves toward the distal end side of the stapler. After the pressing portion of the actuating rod 2 moves toward the distal end side of the stapler until it contacts the retaining member, the retaining member is pressed downward, and the retaining member is engaged with the first slider 5 to hinder the movement of the first slider 5 toward the proximal end side of the stapler, thereby maintaining the stability of the nail head when closed.

[0073] like Figures 6 to 10 , which shows the structure of the stapler and the closing drive mechanism after the movable handle 3 is gripped for the first time. In this embodiment, a first groove 51 is provided on the upper surface of the first slider 5. After the movable handle 3 is gripped in the initial state, the retainer is engaged with the first slider 5 to maintain the stability of the nail head when closed. The engagement here means that at least part of the structure of the retainer enters the first groove 51 of the first slider 5. In other alternative embodiments, the engagement between the retainer and the first slider 5 may also be: the retainer is provided with an upwardly concave groove. When the movable handle 3 is gripped in the initial state, the first slider 5 at least partially enters the groove of the retainer.

[0074] like Figures 8 to 10 As shown, a boss 61 is provided on one side of the second slider 6. In the initial position, the boss 61 is located at the distal side of the first groove 51, and the height of the boss 61 is higher than the first groove 51. When the movable handle 3 is held in the initial state, the first slider 5 moves toward the distal side, the first groove 51 of the first slider 5 comes under the boss 61, and the flange 23 moves toward the distal side of the stapler until it contacts the upper end of the third slider 7, applying downward pressure to the third slider 7. Under the pressing action of the flange 23, the third slider 7 drives the second slider 6 to move downward as a whole, so that the boss 61 of the second slider 6 moves downward and at least partially enters the first groove 51 of the first slider 5.

[0075] A first biasing member is disposed below the third slider 7, and the first biasing member applies a biasing force upward to the third slider 7. In this embodiment, the first biasing member is a first compression spring 74. In the initial state, the third slider 7 is kept in the initial position under the action of the first compression spring 74, and when the flange 23 presses the third slider 7 downward, the third slider 7 moves downward and compresses the first compression spring 74 to deform.

[0076] Furthermore, a second biasing member is provided between the inner wall of the receiving groove 71 and the upper surface of the second slider 6, and the second biasing member applies a downward biasing force to the second slider 6. In this embodiment, the second biasing member is a second compression spring 75. When the third slider 7 moves downward and drives the second slider 6 to move downward until the boss 61 enters the first groove 51 of the first slider 5, the second slider 6 has an upward movement tendency relative to the third slider 7, and presses the second compression spring 75 upward to deform.

[0077] like Figure 8 As shown, the distal side surface of the flange 23 is a flange first slope 24 that is inclined upward from the proximal side edge to the distal side edge, and the proximal side surface of the third slider 7 is a third slider first slope 72 that matches the flange first slope 24. Through the mutual guiding effect of the flange first slope 24 and the third slider first slope 72, the flange 23 can contact and press the third slider 7 more smoothly when moving toward the distal side of the stapler.

[0078] like Fig. 9 and Fig.10 As shown, the distal side surface of the first slider 5 is a first slider first inclined surface 53 that tilts upward from its distal side edge to its proximal side edge, the first slider first inclined surface 53 is an inclined surface that tilts downward from its proximal side edge to its distal side edge, and the proximal side surface of the boss 61 of the second slider 6 is a second slider inclined surface 62 that matches the first slider first inclined surface 53. Through the mutual guiding effect of the first slider first inclined surface 53 and the second slider inclined surface 62, the boss 61 of the second slider 6 can be better guided to enter the first groove 51 of the first slider 5. Further, the first groove 51 has a shape that is adapted to the shape of the first boss 61, and the proximal side surface of the first groove 51 is a first slider second inclined surface 54 that tilts upward from its distal side edge to its proximal side edge.

[0079] The distal side surface of the first groove 51 of the first slider 5 is formed as a first stop surface 55, and correspondingly, the distal side surface of the boss 61 of the second slider 6 is formed as a second stop surface 63, and both the first stop surface 55 and the second stop surface 63 are vertical surfaces. In the initial position, the first stop surface 55 and the second stop surface 63 are spaced apart. Through the cooperation of the first stop surface 55 and the second stop surface 63, the first slider 5 is blocked from moving toward the proximal side when the boss 61 is located in the first groove 51.

[0080] After the nail head is closed, Figures 6 to 10In the state of the stapler, when the movable handle 3 is held again, the movable handle 3 is held and rotated, and its claw 31 contacts the rack 22, and continues to push the actuating rod 2 to move toward the distal end of the stapler by pushing the rack 22. The actuating rod 2 is provided with a firing member 27, and the firing member 27 can fire the stapler during the movement toward the distal end of the stapler, so that the stapler staples and cuts tissues. During the firing process of the stapler, under the pressing action of the flange 23, the boss 61 of the second slider 6 is always kept in the first groove 51 of the first slider 5, thereby maintaining the stability of the stapler head closure during the firing process.

[0081] When the stapler is fired, if it is necessary to open the nail head to separate the nail magazine and the anvil, the retaining member needs to be disengaged from the first slider 5, that is, in this embodiment, the boss 61 of the second slider 6 is disengaged from the first groove 51 of the first slider 5.

[0082] In this embodiment, a yielding portion is further provided on the actuating rod 2. When the stapler is fired, the yielding portion moves to the top of the retaining member, and the retaining member moves upward and at least partially enters the yielding portion. The retaining member is disengaged from the first slider 5, so that the first slider 5 can move toward the proximal side of the stapler, and the closing pull tab 12 can move toward the distal side of the stapler to automatically open the nail head.

[0083] Figures 11 to 14 The structure of the stapler and the closing drive mechanism when the stapler is fired in this embodiment is shown. In this embodiment, the yielding portion is an upwardly concave yielding groove 26 formed at the proximal end of the flange 23, that is, an upwardly concave groove is provided in the flange 23 to yield to the upward movement of the third slider 7. In this embodiment, during the firing of the stapler, the first compression spring 74 is deformed by the action of the third slider 7. When the stapler is fired, the flange 23 no longer presses the third slider 7. Under the action of the deformation recovery force of the first compression spring 74, the third slider 7 moves upward, thereby driving the boss 61 of the second slider 6 to move upward and disengage from the first groove 51 of the first slider 5.

[0084] In this embodiment, the distal side surface of the said giving way groove 26 is the flange second slope 25 which is inclined upward from the distal side edge to the proximal side edge, and the distal side surface of the said third slider 7 is the third slider second slope 73 which matches the said flange second slope 25. Through the mutual guiding action of the flange second slope 25 and the third slider second slope 73, when the stapler is fired, the third slider 7 can be more smoothly separated from the pressing action of the flange 23 and enter the giving way groove 26. In other alternative embodiments, when the stapler is fired, the flange second slope 25 of the flange 23 can still have a certain pressing action on the third slider second slope 73, that is, the pressure of the pressing part on the retainer is reduced but not zero, as long as the upward movement stroke of the third slider 7 can meet the separation of the first boss 61 of the second slider 6 and the first groove 51 of the first slider 5.

[0085] In other alternative embodiments, the length of the flange 23 is set according to the stroke of the actuating rod 2 during the firing of the stapler. The yielding portion is formed between the proximal end of the flange 23 and the actuating rod 2, that is, when the stapler is fired, the flange 23 moves to the distal end of the third slider 7, and the third slider 7 is no longer pressed by the flange 23, and the third slider 7 moves upward until the boss 61 of the second slider 6 is disengaged from the first groove 51 of the first slider 5. In this embodiment, the proximal side surface of the flange 23 is a flange second inclined surface 25 that is inclined upward from its distal side edge to the proximal side edge, so as to guide each other with the second inclined surface 73 of the third slider.

[0086] like Fig.15 and Fig.16 , which is a schematic diagram of the structure of the closing drive mechanism of the second embodiment of the present invention. In this embodiment, the upper surface of the first slider 5 is provided with a first groove 51, the retaining member includes a spring sheet 9, the spring sheet 9 includes a fixed end 91 and a movable end 92, the fixed end 91 of the spring sheet 9 is located at the distal end side of the movable end 92, the fixed end 91 is fixed to the housing 13 of the stapler, and the movable end 92 is bent downward and toward the distal end to form a matching portion that matches the first groove 51 of the first slider 5.

[0087] In the initial state, the pressing parts of the first slider 5 and the actuating rod 2 are both located at the proximal side of the spring sheet 9. When the movable handle 3 is held in the initial state, the movable handle 3 drives the first slider 5 to move toward the distal side of the stapler to below the matching part of the spring sheet 9, so that the pressing part of the actuating rod 2 moves toward the distal side to contact the spring sheet 9, and then presses the spring sheet 9 downward, so that the matching part at least partially enters the first groove 51 of the first slider 5. The spring sheet 9 can be made of a thin metal sheet or other material, and when the matching part of the spring sheet 9 is pressed down, the spring sheet 9 itself generates elastic deformation.

[0088] When the stapler is fired, the mating portion of the spring sheet 9 at least partially enters the yielding portion of the actuating rod 2, so that the pressure of the pressing portion of the actuating rod 2 on the spring sheet 9 is reduced or even eliminated. The spring sheet 9 bounces upward under the restoring force of elastic deformation, so that its mating portion is disengaged from the first groove 51 of the first slider 5, thereby automatically opening the nail head.

[0089] In this embodiment, if Fig.15 and Fig.16 As shown, the spring sheet 9 is provided with a drawstring passing groove 93 for the drawstring 81 to pass through, and the proximal side surface of the upper end of the spring sheet 9 is formed as a first spring sheet slope 94, so as to better guide the pressing part of the actuating rod 2 to press the upper end of the spring sheet 9 when the pressing part contacts the spring sheet 9 and continues to move toward the distal side, and the distal side surface of the upper end of the spring sheet 9 is formed as a second spring sheet slope 95, so as to better guide the pressing part to separate from the spring sheet 9 when the stapler is fired. The proximal end surface of the lower end of the spring sheet 9 is formed as a third spring sheet slope 96, so as to better guide the matching part of the spring sheet 9 to enter the first groove 51 of the first slider 5 when the staple head is closed. The movable end 92 of the spring sheet 9 is formed with a vertical surface matched with the distal side surface of the first groove 51, so as to better keep the spring sheet 9 from accidentally separating from the first groove 51.

[0090] The closed drive mechanism and the medical stapler including the same provided by the present invention have the following advantages:

[0091] The present invention provides a closing drive mechanism for a medical stapler. Before the stapler is fired, after the stapler head is closed by the closing drive, the position of the closing drive is limited by the engagement of a retaining member and a first slider, so as to prevent the closing pull tab from moving toward the distal end side of the stapler when the stapler is fired. After the stapler is fired, the retaining member moves upward and disengages from the first slider, and no longer limits the position of the closing drive, so that the closing drive can return to the initial position, so that the stapler magazine and the stapler anvil can be automatically opened, thereby reducing the doctor's operating steps for the stapler, and the cutter can be pulled back very smoothly.

[0092] 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 closing drive member and an actuating rod, the initial position of at least a part of the structure of the first slider is located at the proximal side of the retaining member, the actuating rod is provided with a pressing portion and a yielding portion, and the initial positions of the pressing portion and the yielding portion of the actuating rod are both located at the proximal side of the retaining member; When the movable handle is held in the initial state, under the action of the movable handle, the first slider moves toward the distal end of the stapler to below the retaining member, and drives the closing drive member to close the stapler head of the stapler, and the pressing portion of the actuating rod moves toward the distal end of the stapler and presses the retaining member downward, and the retaining member is engaged with the first slider; When the stapler is fired, the yielding portion of the actuating rod moves to above the retaining member, the retaining member moves upward and at least partially enters the yielding portion, and the retaining member is disengaged from the first sliding block.

2. The closing drive mechanism according to claim 1, characterized in that: The upper surface of the first slider is provided with a groove, and in the initial position, the groove is located at the proximal side of the retaining member, and when the movable handle is held in the initial state, the retaining member at least partially enters the groove of the first slider; or The retaining member is provided with an upwardly recessed groove, and when the movable handle is held in an initial state, the first sliding block at least partially enters the recess of the retaining member.

3. The closing drive mechanism according to claim 1, characterized in that: The pressing portion of the actuating rod is a flange arranged on the distal end side of the actuating rod, and the giving way portion is recessed upward relative to the flange.

4. The closing drive mechanism according to claim 3, characterized in that: The distal side surface of the flange is a first inclined surface of the flange which is inclined upward from the proximal side edge to the distal side edge, and the proximal side surface of the retainer is a first inclined surface of the retainer which matches the first inclined surface of the flange.

5. The closing drive mechanism according to claim 3, characterized in that: The evacuation portion is a evacuation groove formed in the flange.

6. The closing drive mechanism according to claim 5, characterized in that: The distal side surface of the clearance groove is a second inclined surface of the flange which is inclined upward from the distal side edge to the proximal side edge, and the distal side surface of the retaining member is a second inclined surface of the retaining member which matches the second inclined surface of the flange.

7. The closing drive mechanism according to claim 3, characterized in that: The relief portion is formed between the proximal end side of the flange and the actuating rod.

8. The closing drive mechanism according to claim 7, characterized in that: The proximal side surface of the flange is a flange second slope that tilts upward from its distal side edge to the proximal side edge, and the distal side surface of the retainer is a retainer second slope that matches the flange second slope.

9. The closing drive mechanism according to claim 1, characterized in that: A groove is provided on the upper surface of the first slider, and the retaining member includes a second slider and a third slider. The third slider is provided with a receiving groove for accommodating the second slider, and a boss is provided on one side of the second slider. When the movable handle is held in the initial state, the boss of the second slider moves downward and at least partially enters the groove of the first slider.

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

11. The closing drive mechanism according to claim 1, characterized in that: A groove is provided on the upper surface of the first slider, and the retaining member includes a spring sheet, which includes a fixed end and a movable end. The fixed end of the spring sheet is located on the distal side of the movable end, and the movable end forms a matching portion that matches the groove of the first slider. When the pressing portion of the actuating rod presses the spring sheet downward, the matching portion at least partially enters the groove of the first slider.

12. A medical stapler, characterized in that: The invention comprises the closing drive mechanism according to any one of claims 1 to 11.

Images