Closed driving mechanism and medical stapler including the same

Abstract

The present invention provides a closing drive mechanism and a medical stapler including the same, wherein the closing drive mechanism includes a first slider, a retaining member, a closing drive member and a push block, wherein the first slider is connected to the closing drive member, the first slider includes a first interlocking portion, the retaining member includes a second interlocking portion and a first lifting portion connected thereto, and the push block includes a second lifting portion located below the first lifting portion. When the stapler head of the stapler is closed, the first interlocking portion of the first slider is located below the second interlocking portion of the retaining member, and the first interlocking portion is interlocked with the second interlocking portion, and under the action of the retaining member, the closing drive member is maintained in a closed position, and after the stapler is fired, the push block is lifted upward, and the second lifting portion of the push block lifts the first lifting portion of the retaining member upward, and the second interlocking portion is lifted upward and disengaged from the first interlocking portion, and the closing drive member loses the holding function of the retaining member and can move toward the distal side, thereby opening the stapler head.

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 firing of the stapler, the closing pull tab may be displaced toward the distal end 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, 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 cannot smoothly return 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 slider, and after the stapler is fired, the retaining member is disengaged from the first slider by the lifting action of the push block, and the closing drive member can move to open the nail head.

[0006] An embodiment of the present invention provides a closing drive mechanism for a medical stapler, the closing drive mechanism comprising a first slider, a retaining member, a closing drive member and a push block, the first slider being connected to the closing drive member, the first slider comprising a first engaging portion, the retaining member comprising a second engaging portion and a first lifting portion connected thereto, the push block comprising a second lifting portion located below the first lifting portion;

[0007] When the stapler's nail head is closed, the first engaging portion of the first slider is located below the second engaging portion of the retaining member, and the first engaging portion engages with the second engaging portion. In this state, when the push block is lifted upward, the second lifting portion of the push block lifts the first lifting portion of the retaining member upward, and the second engaging portion is lifted upward and disengaged from the first engaging portion.

[0008] Optionally, in an initial state, the second lifting portion of the push block does not contact the first lifting portion of the retaining member.

[0009] Optionally, the initial position of the first engaging portion is located at the proximal side of the second engaging portion, and the closing drive mechanism further comprises a movable handle and a pressing member, and the initial position of the pressing member is located at the proximal side of the retaining member;

[0010] When the movable handle is held in the initial state, the first slider moves toward the distal side of the stapler, so that the first engaging portion moves to below the second engaging portion, and the pressing member moves toward the distal side of the stapler and presses the retaining member downward, so that the second engaging portion moves downward and engages with the first engaging portion, and the first slider drives the closing drive member to move toward the proximal side of the stapler to close the nail head.

[0011] Optionally, the closing drive mechanism further comprises an actuating rod, the pressing member is arranged at the distal end side of the actuating rod, and when the movable handle is held in an initial state, the movable handle drives the actuating rod to move toward the distal end side of the stapler.

[0012] Optionally, the retaining member includes a second slider and a third slider, the second slider includes the second engaging portion and the first lifting portion, and when the movable handle is held in an initial state, the pressing member presses the third slider downward, so that the third slider drives the second slider to move downward.

[0013] Optionally, a first biasing member is provided between the second slider and the third slider, and the first biasing member applies a biasing force downward to the second slider;

[0014] When the push block is lifted upward in a state where the first engaging portion and the second engaging portion are engaged, the second slider moves upward relative to the third slider, and the first biasing member is deformed.

[0015] Optionally, when the stapler's stapler head is closed, the second lifting portion of the push block does not contact the first lifting portion of the second sliding block; or,

[0016] When the stapler's nail head is closed, the second lifting portion of the push block contacts the first lifting portion of the retaining member, but the force exerted by the second lifting portion on the second sliding block is insufficient to drive the first biasing member to deform.

[0017] Optionally, a receiving groove is provided inside the third sliding block, and the second sliding block is disposed in the receiving groove.

[0018] Optionally, a second biasing member is provided between the push block and the housing of the stapler, and the second biasing member applies a biasing force downward to the push block;

[0019] When the push block is lifted upward, the second biasing member is deformed.

[0020] Optionally, a third biasing member is provided on the proximal side of the closing drive member, and the third biasing member applies a biasing force to the closing drive member toward the distal side of the stapler.

[0021] Optionally, the push block further includes an operating portion, and a first side of the operating portion of the push block protrudes from the outside of the housing of the stapler.

[0022] Optionally, the second lifting portion of the push block is a lifting arm protruding from the second side of the operating portion.

[0023] Optionally, a fourth biasing member is provided between the retaining member and the housing of the stapler, and the fourth biasing member applies an upward biasing force to the retaining member.

[0024] Optionally, the first engaging portion is a boss, and the second engaging portion is a groove; or

[0025] The first engaging portion is a groove, and the second engaging portion is a boss.

[0026] An embodiment of the present invention further provides a medical stapler, comprising the above-mentioned closing drive mechanism.

[0027] The closed drive mechanism and the medical stapler including the same provided by the present invention have the following advantages:

[0028] The present invention provides a closing drive mechanism for a medical stapler, which limits the position of the closing drive member by engaging a retaining member and a first slider after the stapler head is pulled closed by the closing drive member before the stapler is fired, thereby preventing the closing pull tab from moving toward the distal end side of the stapler when the stapler is fired, and when the stapler head needs to be opened after the stapler has been fired, the push block is lifted upward, and the retaining member is disengaged from the first slider through the lifting action of the push block, and the position of the closing drive member is no longer restricted, and the closing drive member can return to the initial position, so that the staple magazine and the staple anvil can be opened, and the cutter can be pulled back very smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] 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;

[0031] Figure 2 yes Figure 1 A schematic diagram of the structure in which the stapler housing is removed;

[0032] 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;

[0033] Figure 4 A three-dimensional diagram of a first sliding block and a retaining member in an initial state of a first embodiment of the present invention;

[0034] Figure 5 It is a schematic diagram of the structure of the cooperation between the retaining member and the push block in the initial state of the first embodiment of the present invention;

[0035] Figure 6 It is a schematic diagram of the partial structure of the stapler when the staple head is closed according to the first embodiment of the present invention;

[0036] Figure 7 It is a schematic structural diagram of the retaining member of the first sliding block when the nail head is closed according to the first embodiment of the present invention;

[0037] Figure 8 A three-dimensional diagram of the closing drive mechanism when the nail head is closed according to the first embodiment of the present invention;

[0038] Fig. 9 It is a schematic structural diagram of the retaining member when the nail head is closed according to the first embodiment of the present invention;

[0039] Fig.10 It is a schematic structural diagram of the cooperation between the retaining member, the push block and the first sliding block when the nail head is closed according to the first embodiment of the present invention;

[0040] Fig.11 It is a structural schematic diagram of the push block when the nail head is closed according to the first embodiment of the present invention;

[0041] Fig.12 A three-dimensional diagram of the cooperation between the retaining member and the first sliding block when the push block is lifted according to the first embodiment of the present invention;

[0042] Fig.13 It is a schematic structural diagram of the cooperation between the retaining member and the first sliding block when the push block is lifted according to the first embodiment of the present invention.

[0043] Reference numerals:

[0044] 1 Stapler body 51 First groove

[0045] 11 Fixed handle 52 Second groove

[0046] 12 pull tab 53 first slider first inclined surface

[0047] 13 housing 54 first slider second inclined surface

[0048] 2 Actuating rod 55 First stop surface

[0049] 21 Propulsion tooth 6 Second slide

[0050] 22 rack 61 boss

[0051] 23 flange 62 boss slope

[0052] 24 flange first inclined surface 63 second stop surface

[0053] 25 firing member 64 first lifting portion

[0054] 3 Movable handle 7 Third slide

[0055] 31 claw 71 receiving groove

[0056] 32 connecting rod 72 third slider first inclined surface

[0057] 4 Push block 74 first compression spring

[0058] 41 second lifting portion 75 second compression spring

[0059] 42 operating part 81 pull cord

[0060] 43 Third compression spring 82 Steering support beam

[0061] 44 First guide portion 83 Closed drive member

[0062] 5 First slider 84 Third compression spring DETAILED DESCRIPTION

[0063] 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.

[0064] 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 first slider, a retainer, a closing drive member and a push block, and the closing drive member is connected to the closing pull tab and can drive the stapler head to open and close. Specifically, the closing drive member is defined as having a closed position and an open position, and when the closing drive member is in the closed position, the stapler head is closed, and when the closing drive member is in the open position, the stapler head is opened. The first slider is connected to the closing drive member, and the first slider includes a first interlocking portion, and the retainer includes a second interlocking portion and a first lifting portion connected thereto, and the push block includes a second lifting portion located below the first lifting portion.

[0065] When the stapler's nail head is closed, the first engaging portion of the first slider is located below the second engaging portion of the retainer, and the first engaging portion engages with the second engaging portion. Under the action of the retainer, the closing drive is maintained in the closed position, and the nail head is maintained in a closed state and will not open accidentally. After the stapler is fired, when the nail head needs to be opened, the operator lifts the push block upward, and the second lifting portion of the push block lifts the first lifting portion of the retainer upward, and the first lifting portion drives the second engaging portion connected thereto to lift upward and disengage from the first locking portion, whereby the retainer no longer limits the position of the first slider, and will not limit the position of the closing drive connected to the first slider. The closing drive loses the holding function of the retainer and can move to the open position, thereby opening the nail head, and the cutter can be pulled back very smoothly at this time.

[0066] Combine the following Figures 1 to 13 The structures of the closing drive mechanism and the stapler in the specific implementation manner of the present invention are specifically introduced.

[0067] like Figures 1 to 5As 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, and 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, and 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 first slider 5, a retainer, a closing drive 83 and a push block 4, the first slider 5 is connected to the closing drive 83, the first slider 5 includes a first interlocking portion, the retainer includes a second interlocking portion and a first lifting portion 64 connected thereto, and the push block 4 includes a second lifting portion 41 located below the first lifting portion 64.

[0068] In the present invention, the distal side and the proximal side are relative to the operator, wherein the distal side refers to the end farther from the operator, and the proximal side refers to the end closer to the operator. Figure 1 and Figure 2 In the perspective of FIG. 1 , the distal end of the stapler body 1 is the left end in the figure, the right end of the stapler body 1 is the right end in the figure, the distal end of the actuating rod 2 is the left end in the figure, and the proximal end of the actuating rod 2 is the right end in the figure. In addition, in the present invention, the upper and upward directions refer to the side of the actuating rod 2 that is away from the rack 22, and the lower and downward directions are opposite to this. For example, in FIG. Figure 2 In the perspective of , the upward direction refers to the upper end of the figure.

[0069] In this embodiment, the first engaging portion of the first slider 5 is a first groove 51, and the second engaging portion of the retainer is a boss 61. In other alternative embodiments, the first engaging portion may be a boss, and the second engaging portion may be a groove. The structure of the first engaging portion and the second engaging portion of this embodiment is described below as an example.

[0070] like Figure 3 and Figure 4As shown, in this embodiment, the retaining member includes a second slider 6 and a third slider 7, and a receiving groove 71 is provided inside the third slider 7, and the second slider 6 is provided in the receiving groove 71. The second slider 6 includes the boss 61 and the first lifting portion 64. A first biasing member is provided between the second slider 6 and the third slider 7, and the first biasing member gives the second slider 6 a biasing force toward the bottom. The third slider 7 and the housing of the stapler are directly provided with a fourth biasing member, and the fourth biasing member gives the third slider 7 a biasing force toward the top. In this embodiment, the first biasing member is a first compression spring 74 provided between the inner wall of the receiving groove 71 and the second slider 6, and the fourth biasing member is a second compression spring 75 provided at the bottom of the third slider 7. However, the present invention is not limited thereto. In other alternative embodiments, the first biasing member and the fourth biasing member may also respectively adopt other elastic structures such as tension springs and metal springs.

[0071] like Figure 5 As shown, the push block 4 also includes an operating part 42, and the second lifting part 41 of the push block 4 is a lifting arm protruding from the second side of the operating part 42. The first side of the operating part 42 of the push block 4 protrudes from the outside of the shell of the stapler, and the doctor can directly operate the operating part 42 of the push block 4 on the outside of the instrument. A second biasing member is arranged between the push block 4 and the shell of the stapler, and the second biasing member gives the push block 4 a biasing force toward the bottom. In this embodiment, the second biasing member is a third compression spring 43 arranged above the push block 4. However, the present invention is not limited to this. In other alternative embodiments, the second biasing member may also adopt other elastic structures such as compression springs and metal springs. Fig.10 and Fig.11 As shown, the push block 4 is provided with a first guide portion 44, the housing 13 (the housing 13 is shown in Figure 1 The first guide portion 44 and the second guide portion are mutually boss and groove structures, and the push block 4 is arranged along the direction of the third compression spring 43. Fig.10 As shown, due to the guiding effect of the first guide portion 44 and the second guide portion, the push block 4 can move along the direction A in the figure or in the direction opposite to the direction A. The bottom of the push block 4, that is, the side away from the third compression spring 43, is abutted against the housing 13, so that the push block 4 does not separate from the housing.

[0072] Furthermore, a third biasing member is provided on the proximal side of the closing drive member 83, and the third biasing member gives the closing drive member 83 a biasing force toward the distal side of the stapler. In this embodiment, the third biasing member is a third compression spring 84 provided on the proximal side of the closing drive member 83. In other alternative embodiments, the third biasing member may also be a tension spring, a metal spring, or other elastic structures.

[0073] The first slider 5 is connected to the closed driving member 83 through a steering assembly. 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. Preferably, the steering support beam 82 is set as a pulley to reduce the resistance of the pull rope 81 when it moves. The pulley 82 is located on 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. Preferably, fixed ends are respectively provided at both ends of the pull rope 81. The proximal side of the first slider 5 can be provided with a second groove 52, and one fixed end of the pull rope 81 can be detachably installed in the second groove 52. The other fixed end of the pull rope 81 is 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.

[0074] In this embodiment, the closing drive mechanism further includes a movable handle 3 and a pressing member, and the pressing member is a flange 23 provided on the distal side of the actuating rod 2. In the initial state, the initial position of the first groove 51 of the first slider 5 is located on the proximal side of the boss 61 of the retaining member, and the initial position of the pressing member is located on the proximal side of the retaining member.

[0075] like Figures 6 to 11 As shown, when the movable handle 3 is held in the initial state, the rotation of the movable handle 3 drives the connecting rod 32 to move toward the distal side of the stapler, thereby causing the connecting rod 32 to push the first slider 5 to move toward the distal side of the stapler, so that the first groove 51 moves to the bottom of the boss 61. The steering assembly converts the movement of the first slider 5 toward the distal side of the stapler into the movement of the closing drive 83 toward the proximal side of the stapler, so that the closing drive 83 moves from the open position to the closed position, thereby pulling the closing pull tab 12 to move toward the proximal side of the stapler, thereby closing the stapler head. Figure 6 As shown, at this time, the third compression spring 84 is compressed and deformed by the force of the closing drive member 83.

[0076] At the same time, in the initial state, when the movable handle 3 is held and rotated, 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 of the stapler. The actuating rod 2 drives the flange 23 to move toward the distal end of the stapler until it contacts the third slider 7, and then presses the third slider 7 downward. The third slider 7 drives the second slider 6 to move downward. The boss 61 of the second slider 6 is engaged with the first groove 51 of the first slider 5 to hinder the movement of the first slider 5 toward the proximal end of the stapler, keeping the closing drive 83 in the closed position and maintaining the stability of the stapler head when closed. Figure 6 and Figure 7 As shown, at this time, due to the downward pressure of the flange 23 on the third slider 7, the third slider 7 compresses the second compression spring 75 downward, so that the second compression spring 75 is compressed and deformed. Preferably, in the initial state, a certain distance is set between the first lifting portion 64 of the second slider 6 and the second lifting portion 41 of the push block 4, that is, the first lifting portion 64 of the second slider 6 does not contact the second lifting portion 41 of the push block 4; Fig.10 and Fig.11 As shown, when the movable handle 3 is held so that the nail head remains in a closed state, the boss 61 of the second slider 6 is engaged with the first groove 51 of the first slider 5, and at this time, a slight distance is provided between the first lifting portion 64 of the second slider 6 and the second lifting portion 41 of the push block 4, that is, the first lifting portion 64 and the second lifting portion 41 do not contact each other, but it is necessary to ensure that when the push block 4 is lifted upward, the push block 4 will contact and lift the first lifting portion 64 during the upward movement, or the first lifting portion 64 of the second slider 6 is slightly in contact with the second lifting portion 41 of the push block 4, but the force exerted by the second lifting portion 41 on the first lifting portion 64 is not enough to compress the first compression spring 74 to deform. In this way, when no thrust is applied to the push block 4, the setting of the second lifting portion 41 does not hinder the boss 61 of the second slider 6 from engaging with the first groove 51 of the first slider 5, thereby ensuring stable closure.

[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 Figure 4 and Fig. 9As shown, the distal side surface of the first slider 5 is a first slider first inclined surface 53 that is inclined upward from its distal side to its proximal side, the first slider first inclined surface 53 is an inclined surface that is inclined downward from its proximal side to its distal side, and the proximal side surface of the boss 61 of the second slider 6 is a boss 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 boss 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 of the first slider 5 has a shape that is adapted to the shape of the first boss 61, that is, the proximal side surface of the first groove 51 is a first slider second inclined surface 54 that is inclined upward from its distal side to its proximal side.

[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, Figure 6 In the state of the stapler shown in FIG. 1 , 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 25, and the firing member 25 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] exist Fig.10 When the nail head is closed, the doctor moves along the Fig.10 The operating portion 42 of the push block 4 is lifted in the direction indicated by the arrow A, so that when the push block 4 moves upward, the second lifting portion 41 of the push block 4 lifts the first lifting portion 64 of the second slide block 6 upward, so that the second slide block 6 moves upward. Fig.12 and Fig.13As shown, when the second slider 6 is lifted upward by the push block 4, since the height of the first slider 7 remains unchanged under the pressure of the flange 23, the second slider 6 has a tendency to move upward relative to the first slider 7 and compresses the first compression spring 74 to deform, and the boss 61 of the second slider 6 moves upward and separates from the first groove 51 of the first slider 5. At the same time, during the lifting process of the push block 4, the push block 4 compresses the third compression spring 43 to generate compression deformation, and the second slider 6 is lifted upward by the push block 4 to separate the boss 61 of the second slider 6 and the first groove 51 of the first slider 5. Fig.13 As shown, after the second slider 6 no longer limits the position of the first slider 5, under the deformation recovery force of the third compression spring 84 toward the distal end of the stapler, the closing drive 83 pulls the pull rope 81 to move toward the distal end of the stapler, and under the steering action of the steering support beam 82, the movement of the closing drive 83 drives the second slider 6 to move toward the proximal end of the stapler. At this time, the closing drive 83 drives the closing pull tab 12 to move toward the distal end of the stapler, the stapler head of the stapler can be opened, the anvil and the staple magazine are separated, the tissue between the anvil and the staple magazine can be released, and the cutter can be pulled back more smoothly.

[0083] Figures 1 to 13 Only the specific structure of the closing drive mechanism of a specific embodiment of the present invention is shown, and it is not intended to limit the protection scope of the present invention. In other alternative embodiments, the various components therein can be deformed in various ways, all of which are within the protection scope of the present invention. For example, the positional relationship between the second slider 6 and the third slider 7 is not limited to the method of using a receiving groove. A guide groove can be provided on the third slider 7, and the second slider 6 can be embedded in the guide groove, and an elastic member can be provided in the guide groove, so that when the first slider 7 moves downward, it drives the second slider 6 to move downward, and when the first slider 7 is fixed, the second slider 6 can also have an upward movement trend relative to the first slider 7. The structure of the second lifting portion of the push block 4 is not limited to the lifting arm, and other structures such as a convex block and a round table can also be used. The pressing member is not limited to the flange structure on the actuating rod 2, and the firing member 25 can also be used to press the third slider 7, or other boss structures that move toward the distal side when the movable handle 3 is held are added as pressing members, etc.

[0084] The closed drive mechanism and the medical stapler including the same provided by the present invention have the following advantages:

[0085] The present invention provides a closing drive mechanism for a medical stapler, which limits the position of the closing drive member by engaging a retaining member and a first slider after the stapler head is pulled closed by the closing drive member before the stapler is fired, thereby preventing the closing pull tab from moving toward the distal end side of the stapler when the stapler is fired, and when the stapler head needs to be opened after the stapler has been fired, the push block is lifted upward, and the retaining member is disengaged from the first slider through the lifting action of the push block, and the position of the closing drive member is no longer restricted, and the closing drive member can return to the initial position, so that the staple magazine and the staple anvil can be opened, and the cutter can be pulled back very smoothly.

[0086] 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 scope of protection of the present invention.

Claims

1. A closed drive mechanism, characterized in that: For a medical stapler, the closing drive mechanism comprises a first slider, a retaining member, a closing drive member and a push block, the first slider is connected to the closing drive member, the first slider comprises a first engaging portion, the retaining member comprises a second engaging portion and a first lifting portion connected thereto, and the push block comprises a second lifting portion located below the first lifting portion; When the stapler's nail head is closed, the first engaging portion of the first slider is located below the second engaging portion of the retaining member, and the first engaging portion engages with the second engaging portion. In this state, when the push block is lifted upward, the second lifting portion of the push block lifts the first lifting portion of the retaining member upward, and the second engaging portion is lifted upward and disengaged from the first engaging portion.

2. The closing drive mechanism according to claim 1, characterized in that: In an initial state, the second lifting portion of the push block does not contact the first lifting portion of the retaining member.

3. The closing drive mechanism according to claim 1, characterized in that: The initial position of the first engaging portion is located at the proximal side of the second engaging portion, and the closing drive mechanism further comprises a movable handle and a pressing member, and the initial position of the pressing member is located at the proximal side of the retaining member; When the movable handle is held in the initial state, the first slider moves toward the distal side of the stapler, so that the first engaging portion moves to below the second engaging portion, and the pressing member moves toward the distal side of the stapler and presses the retaining member downward, so that the second engaging portion moves downward and engages with the first engaging portion, and the first slider drives the closing drive member to move toward the proximal side of the stapler to close the nail head.

4. The closing drive mechanism according to claim 3, characterized in that: The closing drive mechanism further comprises an actuating rod, the pressing member is arranged at the distal end side of the actuating rod, and when the movable handle is held in the initial state, the movable handle drives the actuating rod to move toward the distal end side of the stapler.

5. The closing drive mechanism according to claim 3, characterized in that: The retaining member includes a second slider and a third slider, the second slider includes the second engaging portion and the first lifting portion, and when the movable handle is held in an initial state, the pressing member presses the third slider downward, so that the third slider drives the second slider to move downward.

6. The closing drive mechanism according to claim 5, characterized in that: A first biasing member is disposed between the second slider and the third slider, and the first biasing member applies a biasing force downward to the second slider; When the push block is lifted upward in a state where the first engaging portion and the second engaging portion are engaged, the second slider moves upward relative to the third slider, and the first biasing member is deformed.

7. The closing drive mechanism according to claim 6, characterized in that: When the stapler's stapler head is closed, the second lifting portion of the push block does not contact the first lifting portion of the second sliding block; or, When the stapler's nail head is closed, the second lifting portion of the push block contacts the first lifting portion of the retaining member, but the force exerted by the second lifting portion on the second sliding block is insufficient to drive the first biasing member to deform.

8. The closing drive mechanism according to claim 5, characterized in that: The third sliding block is provided with a receiving groove inside, and the second sliding block is arranged in the receiving groove.

9. The closing drive mechanism according to claim 3, characterized in that: A second biasing member is provided between the push block and the housing of the stapler, and the second biasing member applies a biasing force downward to the push block; When the push block is lifted upward, the second biasing member is deformed.

10. The closing drive mechanism according to claim 3, characterized in that: A third biasing member is disposed on the proximal side of the closing drive member, and the third biasing member applies a biasing force to the closing drive member in the direction of the distal side of the stapler.

11. The closing drive mechanism according to claim 1, characterized in that: The push block further includes an operating portion, and a first side of the operating portion of the push block protrudes from the outside of the housing of the stapler.

12. The closing drive mechanism according to claim 11, characterized in that: The second lifting portion of the push block is a lifting arm protruding from the second side of the operating portion.

13. The closing drive mechanism according to claim 1, characterized in that: A fourth biasing member is provided between the retaining member and the housing of the stapler, and the fourth biasing member applies an upward biasing force to the retaining member.

14. The closing drive mechanism according to claim 1, characterized in that: The first fitting portion is a boss, and the second fitting portion is a groove; or The first engaging portion is a groove, and the second engaging portion is a boss.

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

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