Manual back-up wrench for stapler and manual back-up stapler

Abstract

The utility model relates to medical instrument technical field especially, more particularly to a kind of anastomat manual back-off wrench and manual back-off type anastomat.A kind of anastomat manual back-off wrench, characterized by, including main body and second limit force application part being located on main body;Second limit force application part is matched with the first limit force application part of the active back-off wheel set on anastomat, and second limit force application part is used to force application to active back-off wheel by the wrench.Second limit force application part is the limit connecting hole with internal thread or the force application shaft with external thread.This scheme realizes the reliable limit engagement of wrench and active back-off wheel, one-way torque transmission and nail magazine box disassembly integration, improves the security, reliability and convenience of electric anastomat fault back-off and on-site maintenance.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a manual retraction wrench for a stapler and a manual retraction stapler. Background Technology

[0002] After firing, electric staplers often require manual retraction of the firing rack to its initial position in case of malfunction or an empty staple cartridge, to prevent it from remaining in the body or damaging tissue. Existing technology, such as Chinese Patent CN111202553B (hereinafter referred to as Document 1), discloses a manual retraction device for electric staplers, which achieves manual retraction through the cooperation of components such as an intermediate gear and a retraction drive gear.

[0003] However, the device is still lacking in the connection method between the externally applied components and the active return wheel, as well as in torque control. Utility Model Content

[0004] The purpose of this invention is to provide a manual retraction wrench for a stapler that addresses the shortcomings of existing technologies, aiming to achieve reliable limiting engagement and unidirectional torque transmission between the wrench and the active retraction wheel.

[0005] The present invention achieves the above-mentioned objective through the following technical solution: a manual retraction wrench for a stapler, comprising a main body and a second limiting force-applying part disposed on the main body; the second limiting force-applying part is matched with a first limiting force-applying part disposed on the active retraction wheel of the stapler, and the second limiting force-applying part is used to apply force to the active retraction wheel through the wrench.

[0006] Furthermore, the second limiting force-applying part is a limiting connection hole with internal threads. Correspondingly, the first limiting force-applying part of the active retraction wheel is a force-applying shaft with external threads.

[0007] Furthermore, the second limiting force-applying part is a force-applying shaft with external threads. Correspondingly, the first limiting force-applying part of the active retraction wheel is a limiting connecting hole with internal threads.

[0008] Furthermore, the thread height of the internal thread is less than the depth of the limiting connection hole; specifically, the thread profile height of the internal thread is less than the depth of the limiting connection hole. Preferably, the thread profile height of the internal thread is half or less than half the depth of the limiting connection hole. The purpose of having a thread height less than the hole depth is to facilitate machining and realize the design of the relief groove. Furthermore, this design ensures that when the wrench is connected to the force-applying shaft, after the internal thread is fully screwed in, the external thread still has a reserved portion, preventing the force-applying shaft from being completely screwed into the limit connection hole. This allows the firing rack to retract when the wrench is turned in the forward direction, while the wrench will release when turned in the reverse direction, preventing the wrench from applying force to the force-applying shaft and thus preventing the active retraction wheel from rotating. This achieves a certain degree of unidirectional transmission characteristics, ensuring that the firing rack can only be retracted in the forward direction by the wrench, and cannot be manually advanced in the reverse direction. This further prevents the firing rack from being advanced by the wrench, thereby further enhancing the anti-reuse effect of the faulty stapler.

[0009] Furthermore, the main body includes a force-applying component and a limiting connector; a second limiting force-applying part is provided at one end of the limiting connector, and a third limiting force-applying part is provided at the other end of the limiting connector; the end face of the limiting connector near the second limiting force-applying part is provided as a pressing surface; a fourth limiting force-applying part is provided at the bottom of the force-applying component, which is matched and inserted by the third limiting force-applying part, so that the force-applying component applies force to the limiting connector and rotates the limiting connector.

[0010] Furthermore, the third limiting force-applying part is an external hexagonal part, and the fourth limiting force-applying part is a hexagonal hole into which the external hexagonal part is inserted; the limiting connector is a metal part. Specifically, the limiting connector is a metal part, which can improve the torque limiting strength and the strength of the screw connection, and prevent the thread from stripping due to excessive torque.

[0011] Furthermore, the fourth limiting force-applying part is an external hexagonal part, and the third limiting force-applying part is a hexagonal hole that is matched and inserted by the external hexagonal part; the limiting connector is a metal part.

[0012] Furthermore, the main body is also provided with a staple removal part for removing the staple cartridge from the staple cartridge assembly of the stapler; the staple removal part includes: a receiving position for inserting the top of the staple cartridge, which is recessed with a clearance edge; a top tapping position for pressing against the top of the staple cartridge to apply force to the top of the staple cartridge; and a limiting buckle point, at least one, located on the side of the receiving position away from the top tapping position.

[0013] A manually retractable anastomosis device includes a generator, a firing rack, and a firing wheel that is meshed with the generator and the firing rack respectively; it also includes: a wrench, which is a manual retractable anastomosis device wrench as described in any of the preceding claims; a driven retractable wheel that is meshed with the firing rack; and a driving retractable wheel that is meshed with the driven retractable wheel and has a first limiting force application part that matches a second limiting force application part, such that the first limiting force application part of the driving retractable wheel is rotated by applying force through the wrench.

[0014] A manually retractable stapler includes a generator, a firing rack, and a firing wheel that meshes with the generator and the firing rack respectively; it also includes: a driven retractable wheel that meshes with the firing rack; a driven retractable wheel that meshes with the driven retractable wheel and has a first limiting force application part; a staple cartridge assembly with a staple cartridge box having a latch; and a wrench with a second limiting force application part that matches the first limiting force application part, so that force is applied to the driven retractable wheel by the wrench; It is also provided with a staple removal part for removing the staple cartridge from the staple cartridge assembly; the staple removal part includes: a receiving position for insertion from the top of the staple cartridge and a recessed clearance edge; a top striking position for abutting the top of the staple cartridge to apply force to the top of the staple cartridge; and a limiting buckle for inserting the buckle.

[0015] The beneficial effects of this utility model are: 1. Threaded limit torque transmission: The wrench is equipped with a limit connection hole with internal threads (or a corresponding external thread force-applying shaft), the thread height of which is only half the depth of the limit hole, ensuring that the wrench retains a reserved stroke even after being fully tightened. When rotating in the forward direction, the wrench tightens and pushes the active return wheel; when rotating in the reverse direction, the wrench loosens and does not apply force, eliminating the wrench's misdirection of the firing rack and effectively enhancing the anti-reuse function.

[0016] 2. High torque strength and durability: The limiting connector is made of metal, and the third limiting force application part (external hexagon) and the fourth limiting force application part (hexagonal hole) cooperate to provide higher torque bearing capacity, ensuring that the wrench and return wheel do not slip and the threads do not strip under high resistance conditions, thus improving overall reliability.

[0017] 3. Integrated staple cartridge disassembly function: The wrench body is equipped with a staple disassembly section, including a receiving position, a top tapping position and a limit buckle point, which can complete the disassembly of the staple cartridge in the same operation without changing tools, simplifying the process and improving clinical efficiency.

[0018] Through the above structural innovations, this utility model achieves reliable limiting engagement between the wrench and the active retraction wheel, unidirectional torque transmission, and integrated disassembly of the staple cartridge box, thereby improving the safety, reliability, and convenience of electric stapler retraction during faults and on-site maintenance. Attached Figure Description

[0019] Figure 1A circuit diagram showing the initial state of the anastomosis device firing control circuit.

[0020] Figure 2 This is a circuit diagram showing the firing current-limiting state of the anastomosis device firing control circuit.

[0021] Figure 3 A circuit diagram showing the full firing state of the anastomosis device firing control circuit.

[0022] Figure 4 This is a circuit diagram showing the fully fired state of the anastomosis device firing control circuit.

[0023] Figure 5 A circuit diagram showing the initial retraction state of the anastomosis device firing control circuit.

[0024] Figure 6 A circuit diagram showing the retraction phase of the anastomosis device firing control circuit.

[0025] Figure 7 A circuit diagram showing the fully retracted state of the anastomosis device firing control circuit.

[0026] Figure 8 A circuit diagram showing the reset state of the anastomosis device firing control circuit.

[0027] Figure 9 This is a circuit diagram of the active retraction state during the firing process of the anastomosis device firing control circuit.

[0028] Figure 10 This is a circuit diagram of the anastomosis device firing control circuit for manual retraction after opening the safety cover.

[0029] Figure 11 The diagram shows the structural breakdown and enlarged partial structure of the anastomosis device switching device.

[0030] Figure 12 A schematic diagram of the structure of the anastomosis switch under two switching states.

[0031] Figure 13 This is a schematic diagram showing the two switching states of the anastomosis device switch.

[0032] Figure 14 This is a structural breakdown and enlarged schematic diagram of the anastomosis device switch switching structure.

[0033] Figure 15 This is a schematic diagram showing the structure of the anastomosis device in both the anastomosis and firing states, including the anastomosis handle, the firing handle, and the third switching switch.

[0034] Figure 16 This is a schematic diagram showing the structural breakdown and enlarged partial structure of the first switching trigger and mounting bracket.

[0035] Figure 17 This is a partial structural diagram of the first switching trigger in two states.

[0036] Figure 18 The diagram shows the structure of the flow-limiting disconnect switch in both decomposed and non-decomposed states.

[0037] Figure 19 This is a structural diagram showing a partial structural breakdown of the present invention.

[0038] Figure 20 This is a schematic diagram of the active retraction structure of the anastomosis device in two states.

[0039] Figure 21 These are schematic diagrams and enlarged partial structural diagrams of the firing wheel and driven return wheel of the present invention from two different perspectives.

[0040] Figure 22 This is a structural schematic diagram of another part of the present invention.

[0041] Figure 23 This is an enlarged schematic diagram of the overall structure and some parts of the present invention.

[0042] Figure 24 This is a schematic diagram of the structure of the wrench and the nail cartridge box described in this invention.

[0043] Figure 25 This is a structural diagram illustrating the process of removing the nail cartridge box using the wrench described in this invention. Detailed Implementation

[0044] like Figures 23-25 As shown, this utility model embodiment provides a manual retraction wrench for a stapler, including a main body and a second limiting force application part 71 disposed on the main body; the second limiting force application part 71 is matched with a first limiting force application part 641 disposed on the active retraction wheel 64 of the stapler, and the second limiting force application part 71 is used to apply force to the active retraction wheel 64 through the wrench 7.

[0045] Furthermore, the second limiting force application part 71 is a limiting connection hole with internal threads. Correspondingly, the first limiting force application part 641 of the active retraction wheel 64 is a force application shaft with external threads.

[0046] Furthermore, the second limiting force-applying part 71 is a force-applying shaft with external threads. Correspondingly, the first limiting force-applying part 641 of the active retraction wheel 64 is a limiting connection hole with internal threads.

[0047] Furthermore, the thread height of the internal thread is less than the depth of the limiting connection hole. Specifically, preferably, the thread height of the internal thread is half the depth of the limiting connection hole or less than half the depth of the limiting connection hole. This design ensures that when the wrench 7 is connected to the force-applying shaft, after the internal thread is fully screwed in, the external thread still has a reserved portion, preventing the force-applying shaft 71 from being fully screwed into the limiting connection hole. Thus, when the wrench 7 rotates in the forward direction, the firing rack 5 can be retracted, while when rotated in the reverse direction, the wrench 7 will be released, preventing the wrench 7 from applying force to the force-applying shaft 71. Consequently, the active retraction wheel 64 cannot rotate, and the wrench 7 can only retract the firing rack 5, preventing it from being manually advanced. This further avoids the need to advance the firing rack 5 using the wrench 7, thereby further enhancing the anti-reuse effect on malfunctioning staplers.

[0048] Furthermore, the main body includes a force-applying member 73 and a limiting connector 74; a second limiting force-applying part 71 is provided at one end of the limiting connector 74, and a third limiting force-applying part 741 is provided at the other end of the limiting connector 74; the end face of the limiting connector 74 near the second limiting force-applying part 71 is provided as a pressing surface 72; the bottom of the force-applying member 73 is provided with a fourth limiting force-applying part 731 that is matched and inserted by the third limiting force-applying part 741, so that the force-applying member 73 applies force to the limiting connector 74 and rotates the limiting connector 74.

[0049] Furthermore, the third limiting force-applying part 741 is an external hexagonal part, and the fourth limiting force-applying part 731 is a hexagonal hole into which the external hexagonal part is inserted; the limiting connector 74 is a metal part. Specifically, the limiting connector 74 is a metal part, which can improve the torque limiting strength and the strength of the screw connection, and prevent the thread from stripping due to excessive torque.

[0050] Furthermore, the fourth limiting force application part 731 is an external hexagonal part, and the third limiting force application part 741 is a hexagonal hole that is matched and inserted by the external hexagonal part; the limiting connector 74 is a metal part.

[0051] Furthermore, the main body is also provided with a staple removal part 75 for removing the staple cartridge 821 from the staple cartridge assembly of the stapler; the staple removal part 75 includes: a receiving position 751 for inserting the top of the staple cartridge 821, and a recessed clearance edge 751a; a top tapping position 752 for pressing against the top of the staple cartridge 821 to apply force to the top of the staple cartridge 821; and a limiting buckle 753, at least one, provided on the side of the receiving position 751 away from the top tapping position 752.

[0052] It should also be mentioned that the solution in Reference 1 has two specific drawbacks: 1. The gear needs to be pulled up. When the instrument is stuck, the resistance is extremely high, far exceeding the limit of safe operation. Pulling the gear up will cause the instrument to vibrate severely, which may tear tissue or blood vessels and cause surgical accidents.

[0053] 2. It lacks unidirectional transmission characteristics; the knob can be turned clockwise or counterclockwise to retract the rack, and it can also advance the rack. Repeated forward movement of the rack may cause secondary damage to the tissue.

[0054] The manual retraction wrench and manual retraction stapler of this design do not require pulling the gears up. Simply inserting the wrench 7 into the first limiting force application part 641 on the active retraction wheel 64 rotates the retraction firing rack 5, preventing severe instrument vibration and enhancing safety. Furthermore, the unidirectional transmission characteristic of this design, where rotating the wrench 7 in the forward direction retracts the firing rack 5 while rotating it in the reverse direction prevents the firing rack 5 from advancing, avoids secondary damage to tissue caused by the forward movement of the firing rack 5.

[0055] A manually retractable stapler includes a generator 6, a firing rack 5, and a firing wheel 62 that meshes with the generator 6 and the firing rack 5 respectively; it also includes: a driven retracting wheel 63 that meshes with the firing rack 5; a driving retracting wheel 64 that meshes with the driven retracting wheel 63 and is provided with a first limiting force application part 641; a staple cartridge assembly with a staple cartridge box 821 and a fastener 821a; and a wrench 7 provided with a fastener 821a that meshes with the first limiting force application part 641a. The device is equipped with a second limiting force-applying part 71 that applies force to the active retraction wheel 64 via the wrench 7; it is also provided with a nail removal part 75 for removing the nail cartridge box 821 from the nail cartridge assembly; the nail removal part 75 includes: a receiving position 751, which is inserted from the top of the nail cartridge box 821 and has a recessed clearance edge 751a; a top tapping position 752, which is used to abut against the top of the nail cartridge box 821 to apply force to the top of the nail cartridge box 821; and a limiting buckle 753, which is used to insert the buckle 821a.

[0056] When removing the staple cartridge 821, first bring the staple removal part 75 of the wrench close to the head 821b of the staple cartridge 821. The receiving position 751 should engage with the head 821b of the staple cartridge 821, ensuring that the head 821b is completely embedded in the receiving position 751 and can be held in place by the top tapping position 752. Simultaneously, the limiting hook point 753 should engage with the hook point 821a. Then, apply force to the head 821b of the staple cartridge 821 in the direction of the top tapping position 752, causing the staple cartridge 821 to swing at a certain angle with the tail 821c as the swing fulcrum, thus detaching the staple cartridge 821 from the staple cartridge assembly. Finally, remove the staple cartridge 821.

[0057] like Figures 1-10As shown, a stapler firing control circuit includes a generator, a current limiting protection unit, and multiple switching switches. The switching switches include a first switching switch, a second switching switch, a third switching switch, and a fourth switching switch. Each switching switch has a common terminal, a first switching terminal, and a second switching terminal, wherein the first switching terminal is a normally open terminal and the second switching terminal is a normally closed terminal. The current limiting protection unit includes a current limiting element, a thermistor, and a current limiting disconnect switch connected in series. The current limiting element is a current limiting resistor R, the thermistor is a thermistor PTC, and the current limiting disconnect switch has a first terminal S4-1 and a second terminal S4-2. The first terminal S4-1 and the second terminal S4-2 can be switched on and off. The second terminal S4-2 is electrically connected to one end of the current limiting resistor R, and one end of the thermistor PTC is electrically connected to the other end of the current limiting resistor R. The third switching switch has its common terminal connected to the negative terminal of the generator, its normally open terminal connected to the other end of the thermistor PTC, and its normally closed terminal connected to the negative terminal of the power supply. The second switch has its common terminal connected to the normally closed terminal of the fourth switch, its normally open terminal connected to the normally open terminal of the third switch, and its normally closed terminal connected to the first terminal S4-1. The first switching switch has its common terminal connected to the positive terminal of the generator, its normally open terminal connected to the normally closed terminal of the fourth switching switch, and its normally closed terminal connected to the negative terminal of the power supply. The fourth switch has its common terminal connected to the positive terminal of the power supply, while its normally open terminal is left unused.

[0058] Furthermore, the anastomosis device firing control circuit also includes an indicator light module connected in parallel. Specifically, one end of the indicator light module is electrically connected to the normally closed terminal of the fourth switch, and the other end of the indicator light module is connected to the normally closed terminal of the first switch and / or the negative terminal of the power supply.

[0059] A type of anastomosis switch construction, such as Figure 11 , Figure 12 As shown, it includes: a firing rack, a second switching trigger, and a second switching switch. Wherein: The firing rack has a bevel at one end; The second switching trigger is placed at an angle in the slanted opening, with a second trigger part on one side; The second switching switch is disposed adjacent to the second trigger part and has a second switching contact that is adjacent to and contacted by the second trigger part.

[0060] Furthermore, the second switch has a plug interface on one side, and the second switching trigger has a pin that fits into the plug interface. The second switching trigger is an elastic element with a certain elastic deformation performance. It is used to generate elastic deformation when the second switching trigger is disengaged from the inclined opening, so that when the bottom of the second switching trigger is close to the inclined opening, it is reset and tilted to the inclined opening, thereby separating the second trigger part and the second switching contact of the second switch.

[0061] Furthermore, the contact between the second trigger part of the second switching trigger and the second switching contact of the second switching switch is achieved by the elastic deformation of the bottom of the second switching trigger; one side of the firing rack is provided with a guide surface that is contacted by the bottom of the second switching trigger and extends towards the inclined opening. When the second switching trigger is placed in the inclined opening, the second trigger part separates from the second switching contact of the second switching switch; when the bottom of the second switching trigger detaches from the inclined opening and contacts the guide surface, the second trigger part contacts the second switching contact of the second switching switch. Specifically, the pointed end of the included angle formed between the guide surface and the inclined surface of the inclined opening will abut against the bottom of the second switching trigger. Since one side of the mounting wall of the second switching trigger is tightly fixed to the second switching switch by a pin, the bottom of the second switching trigger will undergo a certain elastic torsion due to the abutment of the pointed end of the included angle, causing the second trigger part of the second switching trigger to abut against the second switching contact of the second switching switch, thereby realizing the switching of the second switching switch, that is, the second switching switch is switched from the conduction of the common terminal and the normally closed terminal to the conduction of the common terminal and the normally open terminal.

[0062] A stapler switch switching structure, such as Figure 13 , Figure 14 As shown, it includes: a firing rack, a first switching switch, and a first switching trigger. Wherein: A rack is fired, and a first groove with a front inner wall and a rear inner wall is provided. The first switch is equipped with a first switching contact; The first switching trigger is movably connected to the stapler and is provided with a first trigger part adjacent to the first switching contact and a first toggle part inserted into the first slide groove; One side of the first actuating part is abutted by the front inner wall, causing the first switching trigger to deflect towards the first switching contact; the other side of the first actuating part is abutted by the rear inner wall, causing the first switching trigger to deflect away from the first switching contact. The contact between the first trigger and the first switching contact is achieved by the front inner wall abutting the first actuating part, causing the first switching trigger to deflect. The disconnection between the first trigger and the first switching contact is achieved by the rear inner wall abutting the first actuating part, causing the first switching trigger to deflect in the opposite direction. Specifically, when the first switching trigger deflects in the first direction from the front inner wall abutting the first actuating part, the first trigger of the first switching trigger contacts the first switching contact of the first changeover switch, thereby triggering the first changeover switch to switch from conduction between the common terminal and normally closed terminal to conduction between the common terminal and normally open terminal. When the first switching trigger deflects in the opposite direction from the rear inner wall abutting the first actuating part, the first trigger of the first switching trigger moves away from and disconnects from the first switching contact of the first changeover switch.

[0063] Furthermore, the first switching trigger is also provided with a hinge portion for movably mounting the first switching trigger to the stapler. Specifically, the first switching trigger deflects based on the hinge portion as a pivot. The hinge portion is a hinge hole, which is hinged by the mounting shaft of the mounting bracket.

[0064] Furthermore, such as Figure 18 , Figure 19 , Figure 22 As shown, it also includes a current-limiting disconnect switch, a current-limiting disconnect trigger, and a current-limiting reset switch. Among them: A current-limiting disconnect switch is equipped with a current-limiting disconnect contact. The current limiting trigger has a current limiting trigger part adjacent to the current limiting contact and a first slide groove extending into the firing rack, which is abutted by the front inner wall and rotates so that the current limiting trigger part contacts the current limiting receiving part of the current limiting contact. The current-limiting reset switch has one end connected to the current-limiting disconnect trigger. It receives manual force to rotate the current-limiting disconnect trigger, resetting it so that the current-limiting trigger part separates from the current-limiting disconnect contact, and the current-limiting trigger part is pushed back into the first slide groove. Specifically, the first end S4-1 of the current-limiting disconnect switch is located on the current-limiting disconnect contact, and the second end S4-2 is located on the current-limiting trigger part; or, the first end S4-1 is located on the current-limiting trigger part, and the second end S4-2 is located on the current-limiting disconnect contact. In detail, combined with... Figures 1 to 10In the firing state, the current-limiting disconnect switch is in the conducting state. After firing, the current-limiting trigger is deflected by the inner wall of the firing rack, breaking the connection between the current-limiting trigger and the current-limiting disconnect contact, thus disconnecting the current-limiting disconnect switch and breaking the current-limiting protection unit. After firing is complete and the device has fully retracted, the current-limiting disconnect switch remains in the open state and cannot automatically reset. Therefore, the stapler cannot fire again; the current-limiting reset knob must be manually rotated to synchronize the rotation of the current-limiting disconnect trigger for complete reset. In this way, the current-limiting disconnect switch effectively prevents accidental firing and effectively reminds the operator that the stapler has been fired and a new staple cartridge assembly must be replaced. The current-limiting disconnect switch must then be manually reset before the stapler can fire again, effectively avoiding the situation of cutting and anastomosing with an empty staple cartridge after a used staple cartridge assembly has been used, thus increasing the safety factor.

[0065] Furthermore, see Figure 14 In diagram B, the first switching trigger has a limit protrusion. See... Figure 16 The mounting bracket is provided with a limiting groove into which a limiting protrusion engages; the mounting bracket is also provided with a mounting shaft hinged to the hinge portion of the first switching trigger. For details, see... Figure 14 , Figure 16 and Figure 17 There are two limiting protrusions, namely protrusion 124a and protrusion 124b; and three limiting grooves, namely groove 85a, groove 85b and groove 85c. Before the stapler is fired, the first trigger part of the first switching trigger element is separated from the first switching contact of the first switching switch. Figure 16 and Figure 17 As shown in Figure A, protrusions 124a and 124b respectively engage with protrusions 85a and 85b, ensuring the stability of the first switching trigger during firing. This prevents the first trigger part from shifting and causing poor contact. Figures 1 to 3 In the process, the first switching switch always remains in the state of 1-3 being on and 1-2 being off. Until the firing rack is fully engaged, the front inner wall of the first slide groove deflects the first switching trigger, at which point... Figure 17 In diagram B, protrusions 124a and 124b respectively engage with protrusions 85b and 85c, ensuring that the first trigger part and the first switching contact remain in contact during the subsequent retraction of the firing rack. Figures 4 to 6 In the process, the first switching switch always maintains the state of 1-2 being on and 1-3 being off, until the rack is retracted to the bottom, causing the rear inner wall of the first slide to deflect and reset the first switching trigger.

[0066] An active stop structure for a stapler includes the stapler switch switching structure described in any one of the preceding embodiments, and further includes an active stop button with a second groove for manually pushing a first switching trigger to deflect; the first switching trigger is also provided with a second actuating part that inserts into the second groove. The second actuating part has a clearance notch on the side near the active stop button. Specifically, moving the active stop button forward or backward actuates the second actuating part of the first switching trigger, causing the first switching trigger to rotate, thereby switching the first switching switch on and off.

[0067] An active retraction structure for an anastomosis device, such as Figures 19-23 As shown, it includes a generator, a firing rack, and a firing wheel that meshes with both the generator and the firing rack; it also includes a driven return wheel and a driven return wheel. The driven return wheel is meshed with the firing rack. The driven return wheel is meshed with the driven return wheel, and the driven return wheel is provided with a first limiting force-applying part that allows external force to rotate the driven return wheel.

[0068] Furthermore, the active retraction structure of the anastomosis device also includes a guide shaft, on which the driven retraction wheel and the firing wheel are coaxially connected. The driven retraction wheel and the firing wheel are movably connected to the guide shaft and can slide along its length. It also includes an elastic element sleeved on the guide shaft, with the elastic force acting on the end of the firing wheel away from the driven retraction wheel. A wrench for rotating the active retraction wheel is also included. The wrench has a second limiting force-applying part that matches the first limiting force-applying part, allowing force to be applied to the active retraction wheel via the wrench. The first limiting force-applying part is a force-applying shaft, and the second limiting force-applying part is a limiting connection port. The force-applying shaft has an external thread, and the limiting connection port has an internal thread that matches the external thread. The wrench has a pressing surface, and the top of the driven retraction wheel has a pressure-receiving part abutted by the pressing surface. The wrench is also used to press down on the driven retraction wheel and the firing wheel by pressing against the pressure-receiving part with the pressing surface. The main body of the stapler is equipped with a removable safety cover plate, which is located on top of the first limiting force application part. Opening the safety cover plate exposes the first limiting force application part of the active return wheel, allowing the wrench to be connected and manually applied to the active return wheel to rotate it.

[0069] A type of anti-reuse stapler, such as Figures 19-23 As shown, it includes a generator, a firing rack, and a firing wheel; it also includes: a driven return wheel, a driving return wheel, a wrench, a guide shaft, and an elastic element. Among them: The firing wheel meshes with the firing generator and the firing rack, respectively. The driven return wheel is coaxially connected to the firing wheel and is adjacent to the firing wheel. A first misaligned joint is provided on the end face near the firing wheel. The driving return wheel is meshed with the driven return wheel; A wrench is used to rotate the drive return wheel and press down the driven return wheel; Guide shafts are coaxially mounted on the firing wheel and the driven return wheel, respectively, so that the firing wheel and the driven return wheel can slide on the guide shafts; The elastic element is sleeved on the guide shaft and acts on the firing wheel to keep the firing wheel on the guide shaft in a predetermined position that can mesh with the firing rack, and to provide a restoring force to the firing wheel when the firing wheel is pressed down. The firing wheel has a second misaligned engagement portion on one end face near the driven return wheel, which is engaged by the first misaligned engagement portion, causing the teeth of the firing wheel to be misaligned with the teeth of the driven return wheel.

[0070] Furthermore, such as Figure 21 As shown in Figures A and B, the first misaligned joint is a misaligned protrusion, and the second misaligned joint is a misaligned groove. When the misaligned protrusion engages with the misaligned groove, the teeth of the firing wheel and the driven return wheel are misaligned. One end of the misaligned protrusion has a first one-way limiting surface, and the other end has a first one-way guiding slope. One end of the misaligned groove has a second one-way limiting surface abutted by the first one-way limiting surface, and the other end has a second one-way guiding slope abutted by the first one-way guiding slope. This allows the following: when the misaligned protrusion engages with the misaligned groove, and the driven return wheel rotates clockwise in the direction of the firing rack's forward movement, the driven return wheel rotates synchronously with the firing wheel; however, when the misaligned protrusion engages with the misaligned groove, and the driven return wheel rotates counterclockwise in the direction of the firing rack's retraction movement, the driven return wheel and the firing wheel can rotate relative to each other, such that the firing wheel remains stationary while the driven return wheel rotates.

[0071] Furthermore, the top of the active retractor wheel is provided with a first limiting force-applying part; the wrench is provided with a second limiting force-applying part that matches the first limiting force-applying part, so that force can be applied to the active retractor wheel by means of the wrench; a safety cover plate is provided on the top of the active retractor wheel. Specifically, the second limiting force-applying part is a limiting connection port with internal threads, and the first limiting force-applying part is a force-applying shaft that is fitted into the limiting connection port, and the force-applying shaft has external threads that match the internal threads.

[0072] Manual retraction process: Open the safety cover to expose the force shaft at the top of the active retraction wheel. Align the wrench's limit connection port with the force shaft and tighten it until the wrench is pressed down and pre-tightened against the active retraction wheel. During the pressing process, the wrench's pressing surface touches the pressure-bearing part at the top of the driven retraction wheel to press down the driven retraction wheel and the firing wheel by a certain stroke until the firing wheel disengages from the firing rack. The elastic element is compressed and generates a restoring force. After the firing wheel disengages from the firing rack, when the wrench is continuously rotated, the driven retraction wheel rotates, which can cause the misalignment protrusion to engage with the misalignment groove. At this time, the teeth between the firing wheel and the driven retraction wheel are misaligned (i.e., the gears of the two are misaligned). Since the driven retraction wheel is still meshed with the firing rack, the teeth between the firing wheel and the firing rack are also misaligned. Under the action of the elastic element, the firing wheel is stuck at the bottom of the firing rack. At this time, due to the structural design of the first and second unidirectional guide ramps, if the wrench is turned to make the driven return wheel rotate counterclockwise, the driven return wheel can still continue to rotate counterclockwise, causing the firing rack to drive the firing lever to continue to return, thus ensuring the manual return function.

[0073] On the other hand, the misaligned protrusion engages with the misaligned groove. If the wrench is turned clockwise to make the driven return wheel move, due to the structural design of the first one-way limiting surface abutting against the second one-way limiting surface, the driven return wheel and the firing wheel will move synchronously. However, the firing wheel is always engaged with the output wheel on the output shaft of the generator, and at this time the generator is not working. Therefore, due to the braking effect of the generator, the driven return wheel cannot rotate clockwise. This ensures that the teeth between the driven return wheel and the firing wheel are always misaligned, which in turn ensures that the teeth between the firing rack and the firing wheel are always misaligned. This avoids the possibility that the teeth of the firing wheel and the teeth of the firing rack will realign, causing the firing wheel to slide back and engage with the firing rack under the pressure of the elastic element. That is, even if the downward pressure of the wrench is withdrawn, the firing wheel and the firing rack cannot reset and re-engage. This prevents the teeth between the firing wheel and the firing rack from being re-engaged and reset, thus avoiding the reuse of malfunctioning staplers. After manually retracting the firing rack, malfunctioning staplers can still achieve the anti-reuse function and effect, effectively avoiding safety hazards caused by reusing malfunctioning staplers.

[0074] Because the firing wheel cannot re-engage with the firing rack, even if the firing generator drives the firing wheel to rotate, it cannot smoothly drive the firing rack forward and backward. This avoids the possibility of a jammed stapler being reused after manual retraction.

[0075] Specifically, such as Figure 21 As shown, the first misaligned joint is a right-angled trapezoidal protrusion structure, and the second misaligned joint is a trapezoidal groove structure that matches the right-angled trapezoidal protrusion and is engaged by the right-angled trapezoidal protrusion.

[0076] In detail, such as Figure 21As shown, the second misaligned joint is a trapezoidal protrusion, and the first misaligned joint is a trapezoidal groove that matches the trapezoidal protrusion and is engaged by the trapezoidal protrusion.

[0077] Anastomosis / clamping process: Engaging the anastomosis handle closes the staple cartridge assembly to clamp the tissue to be cut and stapled.

[0078] Firing process: Squeeze the firing handle, one end of the firing handle abuts against one end of the third switching trigger, causing the third switching trigger to rotate until it contacts the third switching switch, switching the third switching switch from conducting between the common terminal and the normally closed terminal to conducting between the common terminal and the normally open terminal, thereby triggering the firing generator to rotate forward, driving the firing wheel to rotate clockwise. The firing wheel drives the firing rack forward, the firing rack pushes the firing rod forward, and the forward push of the firing rod drives the closed staple cartridge assembly to perform the cutting and stapleping action, completing the cutting and stapleping of the tissue.

[0079] Automatic retraction process: Release the firing handle to reset the third switching trigger and disconnect it from the third switching switch, causing the third switching switch to switch back to the common terminal and normally closed terminal, thereby triggering the firing generator to reverse, so as to drive the firing wheel to rotate counterclockwise, and thus drive the firing rack and firing rod to retract.

[0080] In yet another embodiment, such as Figure 19 and Figure 22 As shown, the generator is equipped with a transmission output wheel mounted on the output shaft of the generator, and the firing wheel meshes with the transmission output wheel.

[0081] A method for controlling the firing of a stapler includes the following steps: initialization step, anastomosis step, firing and current limiting step, full-power firing step, current limiting switch cut-off step, firing to the bottom step, retraction initial step, retraction later stage step, and retraction to the bottom step. Wherein: Initialization steps: See the circuit section. Figure 1 The first, second, and third changeover switches are all configured to connect the common terminal and the normally closed terminal (i.e., SW1-SW3 are connected from 1 to 3), and the fourth changeover switch is also configured to connect the common terminal and the normally closed terminal (i.e., SW0 is connected from 1 to 2). The current-limiting disconnect switch is configured to connect the first terminal S4-1 and the second terminal S4-2. For the corresponding structural details, see: Figure 11 and Figure 12 In Figure A, the second switching trigger is placed at the angle of the firing rack. The second trigger part is separated from the second switching contact, corresponding to the conduction between the common terminal and the normally closed terminal of the second switching switch. See Figure 13 In Figure B, the first trigger part of the first switching trigger is separated from the first switching contact, corresponding to the conduction of the common terminal and the normally closed terminal of the first switching switch. See Figure 15In Figure A, the firing lever is moved away from the third switching trigger, the third trigger part is separated from the third switching contact, and the common terminal and normally closed terminal of the corresponding third switching switch are connected. See Figure 23 The safety cover is installed on the main body of the stapler, corresponding to the conduction between the common terminal and the normally closed terminal of the fourth changeover switch. See Figure 18 and Figure 19 The current limiting trigger part of the current limiting interruption trigger is in contact with the current limiting interruption contact of the current limiting interruption switch, corresponding to the conduction between the first terminal S4-1 and the second terminal S4-2 of the current limiting interruption switch.

[0082] Anastomosis steps: Pinch the anastomosis handle, see... Figure 15 From diagram A to diagram B, after squeezing the engagement handle, the firing handle will be adjacent to the first switching trigger. Simultaneously, see... Figure 23 Squeezing the anastomosis handle will drive the staple cartridge assembly to perform an anastomosis action (i.e., the staple cartridge assembly will close).

[0083] Firing and current limiting procedure: Pinch the firing lever, see Figure 15 From diagram B to diagram C, the third switching trigger is pushed against by the firing handle and rotated, causing the third trigger part to contact the third switching contact to trigger. Figure 2 The third switch is switched to conduction between the common terminal and the normally open terminal (i.e., 1-2 conduction). At this time, the current limiting protection unit is energized, the generator rotates forward, and drives the firing rack forward. Full-power firing steps: see Figure 12 From diagram A to diagram B, as the rack is pushed forward, the second switching trigger disengages from the inclined slot until its bottom contacts the guide surface. At this point, the second switching trigger undergoes a certain elastic deformation and twists, causing the second trigger part to contact the second switching contact, thus achieving... Figure 3 When the second switching switch is triggered, it switches to conduction between the common terminal and the normally open terminal (i.e., switching from 1-3 conduction to 1-2 conduction), the current limiting protection unit is disconnected, and the generator continues to drive the firing rack forward at full power. The firing rack will drive the firing rod forward, so that the firing rod drives the nail cartridge assembly to perform nail engagement and cutting action. Current limiting switch cut-off procedure: After the full-power firing step, see Figure 18 and Figure 19 The firing rack continues to push forward until the front inner wall of the firing rack pushes open the current-limiting receiving part of the current-limiting cut-off trigger, causing the current-limiting cut-off trigger to deflect. Simultaneously, the current-limiting cut-off trigger and the current-limiting reset switch deflect synchronously, and the current-limiting trigger part and the current-limiting cut-off contact separate, thereby achieving... Figure 5 The first terminal S4-1 and the second terminal S4-2 of the medium-limit flow interruptor are disconnected.

[0084] Firing to full extent: After the full-power firing step or the current-limiting switch cut-off step, the firing rack continues to push forward, see... Figure 13In Figure A, the inner wall of the first groove of the firing rack actuates the first actuating part of the first switching trigger, causing the first switching trigger to deflect until the first trigger part contacts the first switching contact, thereby triggering... Figure 4 The first switching switch is switched to conduction of the common terminal and the normally open terminal (i.e., switching from 1-3 conduction to 1-2 conduction), which forms an equipotential voltage across the generator to block the current flow and stops the generator from rotating.

[0085] Revert to initial steps: Release the firing lever, see Figure 15 From diagram C to diagram B, the third trigger section springs back to its original position and separates from the third switching contact to trigger... Figure 5 The third switch in the circuit is switched to conduct between the common terminal and the normally closed terminal (i.e., switched from 1-2 conduction back to 1-3 conduction), which reverses the generator and drives the generator rack to retract.

[0086] Retracting steps: Activate the rack to retract, see... Figure 12 From diagram B to diagram A, the second switching trigger gradually springs back to its original position and falls back to the angled opening until the second trigger part separates from the second switching contact, thus achieving triggering. Figure 6 The second switching switch is switched to conduct between the common terminal and the normally closed terminal (i.e., switching from 1-2 conduction back to 1-3 conduction). At this time, the second switching trigger has not fully returned to the inclined plate, and the firing rack still has a certain amount of retraction space.

[0087] Steps to retract to the end: Activate the rack to continue retracting until you see... Figure 13 From diagram A to diagram B, and Figure 14 When the rack retracts to its final position, the inner rear wall of the first slide groove actuates the first actuating part, causing the first switching trigger to deflect until the first trigger and the first switching contact separate and disconnect, thus achieving... Figure 7 The first switching switch is triggered to switch the common terminal and normally closed terminal to conduct (i.e., switch from 1-2 conduction to 1-3 conduction).

[0088] Warning procedure: Repeat the matching step and / or the current limiting step. If the generator does not start and cannot drive the rack and pinion to move forward or backward, it indicates... Figure 23 If the nail cartridge component has been used and is in an empty nail cartridge state, it is necessary to realize whether to replace it with a new nail cartridge component or nail cartridge to avoid safety hazards caused by the empty nail cartridge being fired.

[0089] Reset procedure: Manually toggle the current-limiting reset switch, see... Figure 22 , Figure 23 ,as well as Figure 18 The diagrams A and B show how the current-limiting trigger deflects in the reset direction until the current-limiting trigger re-engages with the current-limiting contact, thus achieving the desired effect. Figure 8The first terminal S4-1 and the second terminal S4-2 of the current limiting disconnect switch are reconnected. After the reset step, the matching step and / or the current limiting step must be performed again to start the generator to rotate and drive the firing rack forward and backward.

[0090] Furthermore, the full-power firing step also includes: The active retraction step of the firing process: push the active stop button, push the second toggle part of the first switching trigger, so that the first switching trigger rotates until the first trigger part contacts the first switching contact, triggering the first switching switch to switch the common terminal and normally open terminal to conduct, forming an equipotential voltage across the generator to block the current flow, and stopping the generator from rotating. The firing process is as follows: After the current limiting switch is cut off, if the firing process does not actively retract, the firing rack continues to push forward until the first switching switch is triggered to switch the common terminal and normally open terminal to conduct, forming an equipotential voltage across the generator to block the current flow, and the generator stops rotating.

[0091] Furthermore, the full-power firing step also includes: Manual retraction steps: Open the safety cover, switch the fourth switch to connect the common terminal and the normally open terminal, stop the generator, expose the first limit force application part of the active retraction wheel, connect the second limit force application part of the wrench to the first limit force application part, manually turn the wrench to drive the active retraction wheel to rotate, the driven retraction wheel rotates synchronously and drives the firing rack to retract.

[0092] Finally, it should be noted that any cross-referencing or combination of the various embodiments of this solution by those skilled in the art still falls within the original disclosure scope of this solution.

Claims

1. A manual retraction wrench for a stapler, characterized in that, Includes the main body and a second limiting force application part (71) provided on the main body. The second limiting force application part (71) is matched with the first limiting force application part (641) of the active retraction wheel (64) provided on the stapler. The second limiting force application part (71) is used to apply force to the active retraction wheel (64) by the wrench (7). The main body includes a force-applying component (73) and a limiting connector (74). The second limiting force application part (71) is provided at one end of the limiting connector (74), and the other end of the limiting connector (74) is provided with the third limiting force application part (741). The end face of the limiting connector (74) near the second limiting force application part (71) is set as the pressing surface (72); The bottom of the force-applying member (73) is provided with a fourth limit force-applying part (731) that is matched and inserted by the third limit force-applying part (741), so that the force-applying member (73) applies force to the limit connector (74) and rotates the limit connector (74).

2. The manual retraction wrench for the stapler according to claim 1, characterized in that, The second limiting force application part (71) is a limiting connection hole with internal threads.

3. The manual retraction wrench for the stapler according to claim 1, characterized in that, The second limiting force application part (71) is a force application shaft with external threads.

4. The manual retraction wrench for the stapler according to claim 2, characterized in that, The thread height of the internal thread is less than the depth of the limiting connection hole.

5. The manual retraction wrench for the stapler according to claim 1, characterized in that, The third limiting force application part (741) is an external hexagonal part, and the fourth limiting force application part (731) is a hexagonal hole that is matched and inserted by the external hexagonal part; the limiting connector (74) is a metal part.

6. The manual retraction wrench for the stapler according to claim 1, characterized in that, The fourth limiting force application part (731) is an external hexagonal part, and the third limiting force application part (741) is a hexagonal hole that is matched and inserted by the external hexagonal part; the limiting connector (74) is a metal part.

7. The manual retraction wrench for the stapler according to claim 1, characterized in that, The main body is also provided with a staple removal part (75) for removing the staple cartridge (821) from the staple cartridge assembly of the stapler; the staple removal part (75) includes: The receiving position (751) is for insertion into the top of the staple cartridge (821) and is recessed with a clearance edge (751a). Top-button position (752) is used to abut the top of the nail cartridge box (821); At least one limiting stop (753) is provided on the side of the receiving position (751) away from the top tapping position (752).

8. A manually retractable stapler, characterized in that, It includes a generator (6), a rack (5), and a firing wheel (62) that meshes with the generator (6) and the rack (5) respectively; it also includes: The wrench (7) is the manual retraction wrench for the stapler as described in any one of claims 1-7; The driven return wheel (63) is engaged with the firing rack (5); The active return wheel (64) is engaged with the driven return wheel (63) and is provided with a first limit force application part (641) that matches the second limit force application part (71) so that the active return wheel (64) can be rotated by applying force through the wrench (7).

9. A manually retractable stapler, characterized in that, It includes a generator (6), a rack (5), and a firing wheel (62) that meshes with the generator (6) and the rack (5) respectively; it also includes: The driven return wheel (63) is engaged with the firing rack (5); The active return wheel (64) is meshed with the driven return wheel (63) and is provided with a first limiting force application part (641). The staple cartridge assembly includes a staple cartridge box (821), and the staple cartridge box (821) is equipped with a latch (821a); ​​and The wrench (7) is provided with a second limiting force-applying part (71) that matches the first limiting force-applying part (641), so that the wrench (7) applies force to the drive return wheel (64); it is also provided with a nail removal part (75); the nail removal part (75) includes: The receiving position (751) is inserted from the top of the staple cartridge (821) and has a recessed clearance edge (751a). Top-button position (752) for abutting the top of the nail cartridge box (821); and Limiting point (753) is used to insert the locking point (821a).

Images