Anastomat switch structure and anastomat

Abstract

The utility model relates to the technical field of anastomats and change-over switches, in particular to an anastomat switch structure and an anastomat. A switch structure of an anastomat comprises a mounting frame provided with a guide sliding groove opening; the percussion rack is provided with a second avoiding position; the second trigger switching piece comprises a guide connecting part inserted into the guide sliding groove opening and a second contact part which is integrally formed with the guide connecting part and is accommodated by the second avoiding position; and the second change-over switch is arranged adjacent to the second contact part and is provided with a second change-over contact which is adjacent to the second contact part and is contacted by the second contact part. According to the scheme, the requirements for rack stroke detection, switch triggering, part matching stability and the like are met in a limited space, the device is suitable for achieving precise operation and safety control in the anastomat used at high frequency, and the device has positive significance in improving the performance and reliability of surgical instruments.

Description

Technical Field

[0001] This invention relates to the field of anastomosis devices and switching technology, and particularly to an anastomosis device switch structure and anastomosis device. Background Technology

[0002] In surgical procedures, electric or manual staplers use a rack to drive the staple cartridge assembly to staple and cut tissue. To accurately detect and control the movement of the rack, a switch structure is usually installed within the stapler body, and corresponding guide or clearance areas are provided on the rack or mounting bracket to trigger or release the switch during the rack's forward and backward stroke.

[0003] For example, Chinese invention patent CN111202553B discloses a manual retraction device for an electric stapler and the electric stapler itself. This device uses a rack and pinion mechanism to drive a corresponding structure, thereby enabling manual retraction or switching between other functions. However, in applications requiring a more compact design, there is still room for optimization in how to more tightly integrate components such as the mounting bracket, rack, and switching mechanism to achieve high-precision trigger control within a limited space. Especially in high-frequency use or long-term operation scenarios, ensuring the stability and maintainability of the switching structure is also a challenge faced by existing technologies. Utility Model Content

[0004] The purpose of this invention is to provide a stapler switch structure and stapler that addresses the shortcomings of existing technologies. It aims to achieve more accurate detection and trigger control of the firing rack stroke in a confined space, while ensuring the stability of components under high-frequency use scenarios and simplifying the installation and maintenance process, thereby improving the overall operating efficiency and safety reliability of the stapler.

[0005] The present invention achieves the above-mentioned objective through the following technical solution: a stapler switch structure, comprising: a mounting bracket having a guide groove formed thereon; a firing rack having a second recess; a second trigger switching member, including a guide connecting part inserted into the guide groove, and a second contact part integrally formed with the guide connecting part and accommodated by the second recess; and a second switching switch adjacent to the second contact part, having a second switching contact point adjacent to and contacted by the second contact part.

[0006] Furthermore: the firing rack is provided with a guide surface, a second stop is provided at one end of the guide surface, and a guide ramp is provided between the second stop and the guide surface. The second switching contact is located at the top of the second contact portion, and the guide connection portion is located on one side of the second switching switch. A stop is provided on one side of the second stop, and the second contact portion and the guide connection portion form an L-shaped structure, with the guide connection portion and the stop on the same side. The firing rack is provided with a first groove having a front inner wall and a rear inner wall.

[0007] Furthermore, the anastomosis device toggle switch switching structure also includes: a current-limiting disconnect switch with a current-limiting disconnect contact; a current-limiting disconnect trigger with a current-limiting trigger part adjacent to the current-limiting disconnect contact, and a part extending into the first slide groove and rotating against the front inner wall to make the current-limiting trigger part contact the current-limiting receiving part of the current-limiting disconnect contact; and a current-limiting reset knob, one end of which is connected to the current-limiting disconnect trigger for receiving manual force to rotate the current-limiting disconnect trigger to reset it, so that the current-limiting trigger part separates from the current-limiting disconnect contact.

[0008] A stapler comprising the stapler switching structure described in any one of the foregoing.

[0009] Working process: Before firing, the second contact part of the second trigger switch is placed in the second avoidance position and is separated from the second switching contact of the second switch. When firing, the firing rack moves forward, and the guide slope of the second avoidance position will lift the second contact part and guide it to the top of the firing rack (i.e., the guide surface), so that the second contact part is disengaged from the second avoidance position. At this time, the second contact part makes contact with the second switching contact, realizing the switching of the second switch from the conduction of the common terminal and the normally closed terminal to the conduction of the common terminal and the normally open terminal. When the firing rack retracts to a certain stroke, the second contact part falls back into the second avoidance position, realizing the reset switching.

[0010] The beneficial effects of this invention are as follows: By forming a guide groove on the mounting bracket and setting a second clearance on the firing rack, and inserting a second trigger switching element into the guide groove and arranging the "second contact part" and the "second switching contact" adjacent to each other, the following advantages are achieved during the movement of the rack:

[0011] 1. Compact layout and precise triggering. The "second trigger switching component" inserts its guide connection into the guide slot of the mounting bracket, and cooperates with the second clearance and guide ramp on the firing rack, effectively reducing the gap between components and improving the triggering accuracy, making rack stroke detection more reliable.

[0012] 2. Multi-angle coordination enhances stability. By accommodating the second contact part with the second avoidance position and in conjunction with the guide ramp or stop, the second trigger switching element can be supported at multiple angles when the firing rack moves back and forth, reducing the risk of mechanical loosening or displacement, and maintaining switching sensitivity under frequent start and stop.

[0013] 3. High scalability and applicability. When it needs to work in conjunction with other functional units (such as flow-limiting disconnect switches), the "second switching contact" can provide a clear trigger or disconnect signal, making it easy to combine more safety or control mechanisms.

[0014] Through the above design, this solution takes into account the requirements of rack stroke detection, switch triggering and component coordination stability within a limited space. It is suitable for achieving precise operation and safety control in high-frequency anastomosing devices, and has positive significance for improving the performance and reliability of surgical instruments. Attached Figure Description

[0015] Figure 1 This is a circuit diagram showing the initial state of the motor control circuit.

[0016] Figure 2 This is a circuit diagram showing the firing current-limiting state of the motor control circuit.

[0017] Figure 3 This is a circuit diagram showing the full firing state of the motor control circuit.

[0018] Figure 4 This is a circuit diagram showing the fully fired state of the motor control circuit.

[0019] Figure 5 This is a circuit diagram showing the initial state of the motor control circuit during retraction.

[0020] Figure 6 This is a circuit diagram showing the retraction state of the motor control circuit.

[0021] Figure 7 This is a circuit diagram showing the motor control circuit in its fully retracted state.

[0022] Figure 8 This is a circuit diagram showing the reset state of the motor control circuit.

[0023] Figure 9 This is a circuit diagram of the active retraction state during the firing process of the motor control circuit.

[0024] Figure 10 This is a circuit diagram illustrating the manual retraction of the motor control circuit after opening the safety cover.

[0025] Figure 11 The diagram shows the structural breakdown and enlarged partial structure of the anastomosis device switching device.

[0026] Figure 12 A schematic diagram of the structure of the anastomosis switch under two switching states.

[0027] Figure 13 This is a schematic diagram of the two switching states of the anastomosis device's toggle switch switching structure.

[0028] Figure 14 This is a structural breakdown and enlarged schematic diagram of the toggle switch switching structure of the anastomosis device.

[0029] 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.

[0030] Figure 16 This is a schematic diagram showing the structural breakdown and enlarged partial structure of the first switching trigger and mounting bracket.

[0031] Figure 17 This is a partial structural diagram of the first switching trigger in two states.

[0032] Figure 18 The diagram shows the structure of the flow-limiting disconnect switch in both decomposed and non-decomposed states.

[0033] Figure 19 This is a structural diagram showing a partial structural breakdown of the present invention.

[0034] Figure 20 This is a schematic diagram of the active retraction structure of the anastomosis device in two states.

[0035] 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.

[0036] Figure 22 This is a structural schematic diagram of another part of the present invention.

[0037] Figure 23 This is an enlarged schematic diagram of the overall structure and some parts of the present invention.

[0038] Figure 24 This is a schematic diagram of the connection structure between the active retraction wheel and the circuit board of the present invention.

[0039] Figure 25 This is a schematic diagram of the manual retraction process of the stapler of the present invention.

[0040] Figure 26 This is a schematic diagram of the toggle switch switching structure of the anastomosis device of the present invention.

[0041] Figure 27 for Figure 26 A structural diagram of Figure A from another perspective.

[0042] Figure 28 This is a schematic diagram of the anastomosis device toggle switch switching structure of the present invention after it has been installed in the mounting bracket. Detailed Implementation

[0043] like Figures 1-10As shown, a motor control circuit includes a generator 6, a current limiting protection unit, and multiple switching switches. The switching switches include a first switching switch SW1, a second switching switch SW2, a third switching switch SW3, and a fourth switching switch SW0. 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.

[0044] The current limiting protection unit includes a current limiting element, a thermistor, and a current limiting switch 4 connected in series. The current limiting element is a current limiting resistor R, the thermistor is a thermistor PTC, and the current limiting switch 4 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.

[0045] The third switching switch SW3 has its common terminal connected to the negative terminal of the generator 6, 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.

[0046] The second switching switch SW2 has its common terminal connected to the normally closed terminal of the fourth switching switch SW0, its normally open terminal connected to the normally open terminal of the third switching switch SW3, and its normally closed terminal connected to the first terminal S4-1.

[0047] The first switching switch SW1 has its common terminal connected to the positive terminal of the generator 6, its normally open terminal connected to the normally closed terminal of the fourth switching switch SW0, and its normally closed terminal connected to the negative terminal of the power supply.

[0048] The fourth switch SW0 has its common terminal connected to the positive terminal of the power supply, while its normally open terminal is left unused.

[0049] Furthermore, the motor 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 SW0, and the other end of the indicator light module is connected to the normally closed terminal of the first switch SW1 and / or the negative terminal of the power supply.

[0050] It should be noted that this motor control circuit can be used in the field of anastomosis devices and other fields with motors.

[0051] A type of anastomosis switch construction, such as Figure 11 , Figure 12 As shown, it includes: a firing rack 5, a second switching trigger 22, and a second switching switch SW2. Wherein:

[0052] The firing rack 5 has a first stop 52 at one end;

[0053] The second switching trigger 22 is placed at an angle in the first recess 52, and a second trigger part 221 is provided on one side;

[0054] The second switching switch SW2 is disposed adjacent to the second trigger part 221 and has a second switching contact 21 that is adjacent to and contacted by the second trigger part 221.

[0055] Furthermore, the second switching switch SW2 has a plug interface 201 on one side, and the second switching trigger 22 has a pin 222 that fits tightly into the plug interface 201. The second switching trigger 22 is an elastic component with a certain elastic deformation performance. It is used to generate elastic deformation when the second switching trigger 22 is disengaged from the first stop 52, so that when the bottom of the second switching trigger 22 is close to the first stop 52, it is reset and tilted to the first stop 52, thereby separating the second trigger part 221 and the second switching contact 21 of the second switching switch SW2.

[0056] Furthermore, the contact between the second trigger part 221 of the second switching trigger 22 and the second switching contact 21 of the second switching switch SW2 is achieved by the elastic deformation of the bottom of the second switching trigger 22, ensuring that the second switching switch SW2 is continuously pressed; one side of the firing rack 5 is provided with a guide surface 54 that is contacted by the bottom of the second switching trigger 22 and extends toward the first stop 52. When the second switching trigger 22 is placed in the first stop 52, the second trigger part 221 separates from the second switching contact 21 of the second switching switch SW2; when the bottom of the second switching trigger 22 detaches from the first stop 52 and contacts the guide surface 54, the second trigger part 221 contacts the second switching contact 21 of the second switching switch SW2. Specifically, the pointed end of the included angle formed between the guide surface 54 and the guide slope 53 of the first avoidance 52 will abut the bottom of the second switching trigger 22. Since the mounting wall side of the second switching trigger 22 is tightly fixed to the second switching switch SW2 by the pin 222, the bottom of the second switching trigger 22 will undergo a certain elastic torsion due to the abutment of the pointed end of the included angle, so that the second trigger part 221 of the second switching trigger 22 abuts against the second switching contact 21 of the second switching switch SW2, thereby realizing the switching of the second switching switch SW2, that is, the second switching switch SW2 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.

[0057] A type of anastomosis switch structure, such as Figures 26-28The system includes: a mounting bracket 8, a firing rack 5, a second trigger switching element 23, and a second switching switch SW2. The mounting bracket 8 has a guide groove 87; the firing rack 5 has a second recess 55; the second trigger switching element 23 includes a guide connecting portion 231 inserted into the guide groove 87, and a second contact portion 232 integrally formed with the guide connecting portion 231 and accommodated by the second recess 55; the second switching switch SW2 is adjacent to the second contact portion 232 and has a second switching contact 21 that is adjacent to and contacted by the second contact portion 232. The firing rack 5 has a guide surface 54, the second recess 55 is located at one end of the guide surface 54, and a guide ramp 53 is provided between the second recess 55 and the guide surface 54. See [link / reference] Figure 26 In Figure A, before firing, the second contact portion 232 separates from the second switching contact 21; during firing, the firing rack 5 advances, causing the second contact portion 232 of the second trigger switching member 23 to be lifted, the guide connecting portion 231 rises along the guide slide opening 87, and the second contact portion 232 disengages from the second stop 55 until the second contact portion 232 contacts the second switching contact 21. Figure 26 Figure B shows the switch switching process.

[0058] A toggle switch structure for an anastomosis device, such as Figure 13 , Figure 14 As shown, it includes: a firing rack 5, a first switching switch SW1, and a first switching trigger 12. Wherein:

[0059] The rack 5 is fired, and a first groove 51 having a front inner wall 511 and a rear inner wall 512 is provided.

[0060] The first switching switch SW1 is equipped with a first switching contact 11;

[0061] The first switching trigger 12 is movably connected to the stapler and is provided with a first trigger part 121 adjacent to the first switching contact 11 and a first actuating part 122 inserted into the first slide groove 51.

[0062] One side of the first actuating part 122 is abutted by the front inner wall 511, causing the first switching trigger 12 to deflect towards the first trigger part 121 and closer to the first switching contact 11; the other side of the first actuating part 122 is abutted by the rear inner wall 512, causing the first switching trigger 12 to deflect away from the first trigger part 121 and away from the first switching contact 11. The contact between the first trigger part 121 and the first switching contact 11 is achieved by the front inner wall 511 abutting against the first actuating part 122, causing the first switching trigger 12 to deflect. The disconnection between the first trigger part 121 and the first switching contact 11 is achieved by the rear inner wall 512 abutting against the first actuating part 122, causing the first switching trigger 12 to deflect in the opposite direction. Specifically, the first switching trigger 12 deflects in the first direction by abutting the first actuating part 122 against the front inner wall 511, causing the first trigger part 121 of the first switching trigger 12 to contact the first switching contact 11 of the first switching switch SW1, thereby triggering the first switching switch SW1 to switch from the conduction of the common terminal and normally closed terminal to the conduction of the common terminal and normally open terminal. The first switching trigger 12 deflects in the opposite direction to the first direction by abutting the first actuating part 122 against the rear inner wall 512, causing the first trigger part 121 of the first switching trigger 12 to move away from and disconnect from the first switching contact 11 of the first switching switch SW1.

[0063] Furthermore, the first switching trigger 12 is also provided with a hinge portion 123 for movably mounting the first switching trigger 12 onto the stapler. Specifically, the first switching trigger 12 deflects based on the hinge portion 123 as a pivot. The hinge portion 123 is a hinge hole, which is hinged by the mounting shaft 86 of the mounting bracket 8.

[0064] Furthermore, such as Figure 18 , Figure 19 , Figure 22 As shown, it also includes a current-limiting disconnect switch 4, a current-limiting disconnect trigger 42, and a current-limiting reset switch 43. Wherein:

[0065] The flow-limiting disconnect switch 4 is equipped with a flow-limiting disconnect contact 41;

[0066] The current limiting trigger 42 has a current limiting trigger part 421 adjacent to the current limiting contact 41, and a first slide groove 51 extending into the firing rack 5, and is rotated by the front inner wall 511, so that the current limiting trigger part 421 contacts the current limiting receiving part 422 of the current limiting contact 41.

[0067] The current-limiting reset switch 43 is connected at one end to the current-limiting disconnect trigger 42. It receives manual force to rotate the current-limiting disconnect trigger 42 to reset it, separating the current-limiting trigger part 421 from the current-limiting disconnect contact 41, and causing the current-limiting receiving part 422 to be pushed back into the first slide groove 51. Specifically, the first end S4-1 of the current-limiting disconnect switch 4 is located on the current-limiting disconnect contact 41, and the second end S4-2 is located on the current-limiting trigger part 421; or, the first end S4-1 is located on the current-limiting trigger part 421, and the second end S4-2 is located on the current-limiting disconnect contact 41. In detail, in conjunction with... Figures 1 to 10 In the firing state, the flow-limiting disconnect switch 4 is in the conducting state. After firing, the front inner wall 511 of the firing rack 5 presses against the flow-limiting receiving part 422, causing the flow-limiting disconnect trigger 42 to deflect, thereby disconnecting the connection between the flow-limiting trigger 421 and the flow-limiting disconnect contact 41, and thus disconnecting the flow-limiting disconnect switch 4, causing the current-limiting protection unit to be open-circuited. After firing is completed and the device has fully retracted, the flow-limiting disconnect switch 4 is still in the open state and cannot be automatically reset. Therefore, the stapler cannot be fired again. The current-limiting reset knob 43 must be manually rotated to make the flow-limiting disconnect trigger 42 rotate synchronously to fully reset. In this way, the flow-limiting disconnect switch 4 can effectively prevent accidental firing. At the same time, it can effectively remind the operator that the stapler has been fired and a new staple cartridge assembly 82 must be replaced. The flow-limiting disconnect switch 4 must then be manually reset before the stapler can be fired again. This effectively avoids the situation of cutting and anastomosing with an empty staple cartridge after the staple cartridge assembly 82 has been used, thus increasing the safety factor.

[0068] Furthermore, see Figure 14 In diagram B, the first switching trigger 12 is equipped with a limit protrusion 124. (See diagram B.) Figure 16 The mounting bracket 8 is provided with a limiting protrusion 85 into which the limiting protrusion 124 engages; the mounting bracket 8 is also provided with a mounting shaft 86 hinged to the hinge portion 123 of the first switching trigger member 12. For details, see... Figure 14 , Figure 16 and Figure 17 Two limiting protrusions 124 are provided, namely protrusion 124a and protrusion 124b; three limiting grooves 85 are provided, namely groove 85a, groove 85b and groove 85c. Before the stapler is fired, the first trigger part 121 of the first switching trigger 12 is separated from the first switching contact 11 of the first switching switch SW1. At this time, see Figure 16 and Figure 17 As shown in Figure A, protrusions 124a and 124b respectively engage with grooves 85a and 85b, ensuring the stability of the first switching trigger 12 during firing. This prevents the first trigger part 121 from being displaced and thus avoids poor contact due to misalignment of the first switching trigger 12. Figures 1 to 3In the process, the first switching switch SW1 always maintains the state of 1-3 being on and 1-2 being off. Until the firing rack 5 is fired to the bottom, the front inner wall 511 of the first slide groove 51 moves the first switching trigger 12, causing it to deflect. At this time, we see... Figure 17 In Figure B, protrusions 124a and 124b respectively engage with protrusions 85b and 85c, ensuring that during the subsequent retraction of the firing rack 5, the first trigger part 121 and the first switching contact 11 remain in contact. Figures 4 to 6 In the process, the first switching switch SW1 always maintains the state of 1-2 being on and 1-3 being off, until the rack 5 is triggered to retract to the bottom, causing the rear inner wall 512 of the first slide groove 51 to deflect and reset the first switching trigger 12.

[0069] An active stop structure for a stapler includes the toggle switch switching structure described in any of the preceding embodiments, and further includes an active stop button 67 with a second slide groove 671 for manually pushing a first switching trigger 12 to deflect. The first switching trigger 12 is also provided with a second actuating part 125 that inserts into the second slide groove 671. The second actuating part 125 has a clearance notch 125a on the side near the active stop button 67. Specifically, when the active stop button 67 moves forward or backward, it actuates the second actuating part 125 of the first switching trigger 12, causing the first switching trigger 12 to rotate, thereby switching the first switching switch SW1 on or off.

[0070] An active retraction structure for an anastomosis device, such as Figures 19-23 As shown, the device includes a generator 6, a firing rack 5, and a firing wheel 62 that meshes with both the generator 6 and the firing rack 5; it also includes a driven return wheel 63 and a driven return wheel 64. The driven return wheel 63 is meshed with the firing rack 5. The driven return wheel 64 is meshed with the driven return wheel 63, and the driven return wheel 64 is provided with a first limiting force application part 641 that allows external force to rotate the driven return wheel 64.

[0071] Furthermore, the active retraction structure of the anastomosis device also includes a guide shaft 65, on which the driven retraction wheel 63 and the firing wheel 62 are coaxially connected. The driven retraction wheel 63 and the firing wheel 62 are movably connected to the guide shaft 65 and can slide along the length of the guide shaft 65. It also includes an elastic element 66 sleeved on the guide shaft 65, the elastic element 66 acting with elastic force on the end of the firing wheel 62 away from the driven retraction wheel 63. It also includes a wrench 7 for rotating the active retraction wheel 64, the wrench 7 having a second limiting force-applying part 71 that matches the first limiting force-applying part 641, allowing force to be applied to the active retraction wheel 64 through the wrench 7. The first limiting force-applying part 641 is a force-applying shaft, and the second limiting force-applying part 71 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 7 is provided with a holding part 72, and the top of the driven return wheel 63 is provided with a pressure receiving part 632 that is abutted by the holding part 72; the wrench 7 is also used to press down the driven return wheel 63 and the firing wheel 62 by pressing the pressure receiving part 632 with the holding part 72. The main body of the stapler is provided with a removable safety cover plate 81, which is located on top of the first limiting force application part 641. Opening the safety cover plate 81 exposes the first limiting force application part 641 of the active return wheel 64, allowing the wrench 7 to be connected and manually applied force to rotate the active return wheel 64.

[0072] In addition, such as Figure 24 As shown, the anastomosis device of this solution also includes a circuit board 88. The circuit board 88 has a connecting port 881. The first limiting force application part 641 of the active retraction wheel 64 is inserted into the connecting port 881 of the circuit board 88, allowing the active retraction wheel 64 to be mounted on the circuit board 88 and rotate relative to it. During actual manual retraction, the wrench 7 is threaded to the first limiting force application part 641 until it is fully engaged, slightly tightening the active retraction wheel 64 and the circuit board 88. The active retraction wheel 64 can then be rotated using the wrench 7. Alternatively, the active retraction wheel 64 can be movably inserted into the circuit board 88 by using a bearing. The active retraction steps are described below. Figure 25 See Figure A to open the safety cover 81. See Figure B to screw in the wrench 7 to disengage the generator 6 from the firing rack 5. See Figure C to turn the wrench 7 clockwise to the end and press the reset button to open the jaws.

[0073] A type of unidirectional drive anastomosis device, such as Figures 19-23 As shown, it includes a generator 6, a firing rack 5, and a firing wheel 62; it also includes: a driven return wheel 63, a driving return wheel 64, a wrench 7, a guide shaft 65, and an elastic element 66. Wherein:

[0074] The firing wheel 62 is meshed with the firing generator 6 and the firing rack 5 respectively;

[0075] The driven return wheel 63 is coaxially connected to the firing wheel 62 and is adjacent to the firing wheel 62. A first misaligned joint 631 is provided on one end face near the firing wheel 62.

[0076] The active return wheel 64 is meshed with the driven return wheel 63;

[0077] Wrench 7 is used to rotate the active return wheel 64 and press down the driven return wheel 63;

[0078] The guide shaft 65 is coaxially mounted on the firing wheel 62 and the driven return wheel 63, respectively, so that the firing wheel 62 and the driven return wheel 63 can slide on the guide shaft 65;

[0079] The elastic element 66 is sleeved on the guide shaft 65 and acts on the firing wheel 62, so that the firing wheel 62 is maintained on the guide shaft 65 in a predetermined position that can mesh with the firing rack 5, and provides a restoring force for the firing wheel 62 when the firing wheel 62 is pressed down.

[0080] Among them, the firing wheel 62 is provided with a second misaligned engagement portion 621 on one end face near the driven return wheel 63, which is engaged by the first misaligned engagement portion 631, so that the teeth of the firing wheel 62 are misaligned with the teeth of the driven return wheel 63.

[0081] Furthermore, such as Figure 21 As shown in Figures A and B, the first misaligned joint 631 is a misaligned protrusion 631a, and the second misaligned joint 621 is a misaligned groove 621a. When the misaligned protrusion 631a engages with the misaligned groove 621a, the teeth of the firing wheel 62 and the teeth of the driven return wheel 63 are misaligned. One end of the misaligned protrusion 631a is provided with a first one-way limiting surface 631a1, and the other end is provided with a first one-way guiding inclined surface 631a2. One end of the misaligned groove 621a is provided with a second one-way limiting surface 621a1 abutted by the first one-way limiting surface 631a1, and the other end is provided with a second one-way guiding inclined surface 621a2 abutted by the first one-way guiding inclined surface 631a2. This allows for the following: when the misalignment protrusion 631a engages with the misalignment groove 621a, and the driven return wheel 63 rotates clockwise in the direction of the forward movement of the firing rack 5, the driven return wheel 63 and the firing wheel 62 rotate synchronously; while when the misalignment protrusion 631a engages with the misalignment groove 621a, and the driven return wheel 63 rotates counterclockwise in the direction of the retraction of the firing rack 5, the driven return wheel 63 and the firing wheel 62 can rotate relative to each other. If the firing wheel 62 remains stationary while the driven return wheel 63 rotates, unidirectional transmission is achieved.

[0082] Furthermore, the top of the active retracting wheel 64 is provided with a first limiting force application part 641; the wrench 7 is provided with a second limiting force application part 71 that matches the first limiting force application part 641, so that force can be applied to the active retracting wheel 64 by the wrench 7; a safety cover plate 81 is provided on the top of the active retracting wheel 64. Specifically, the second limiting force application part 71 is a limiting connection port with internal threads, and the first limiting force application part 641 is a force application shaft that is fitted into the limiting connection port, and the force application shaft is provided with external threads that match the internal threads.

[0083] Manual retraction process: Open the safety cover 81 to expose the force shaft at the top of the active retraction wheel 64. Align the limit connection port of the wrench 7 with the force shaft and tighten it until the wrench 7 is pressed down and pre-tightened against the active retraction wheel 64. During the pressing process, the holding part 72 of the wrench 7 presses against the pressure receiving part 632 at the top of the driven retraction wheel 63, so as to press down the driven retraction wheel 63 and the firing wheel 62 by a certain stroke until the firing wheel 62 disengages from the firing rack 5, and the elastic element 66 is compressed to generate a restoring force, and the firing wheel 62 is fired. After the firing wheel 62 disengages from the firing rack 5, continuous rotation of the wrench 7 causes the driven return wheel 63 to rotate, allowing the misalignment protrusion 631a to engage with the misalignment groove 621a. At this point, the teeth between the firing wheel 62 and the driven return wheel 63 are misaligned (i.e., their gears are misaligned). Since the driven return wheel 63 is still engaged with the firing rack 5, the teeth between the firing wheel 62 and the firing rack 5 are also misaligned. Under the action of the elastic element 66, the firing wheel 62 is stuck at the bottom of the firing rack 5. At this time, due to the structural design of the first unidirectional guide ramp 631a2 and the second unidirectional guide ramp 621a2, if the wrench 7 is rotated to make the driven return wheel 63 rotate counterclockwise, the driven return wheel 63 can still continue to rotate counterclockwise, causing the firing rack 5 to drive the firing rod to continue to retract, ensuring the manual retraction function.

[0084] On the other hand, the misaligned protrusion 631a is engaged in the misaligned groove 621a. If the wrench 7 is turned to make the driven return wheel 63 rotate clockwise, due to the structural design of the first one-way limiting surface 631a1 abutting against the second one-way limiting surface 621a1, the driven return wheel 63 and the firing wheel 62 will move synchronously. However, the firing wheel 62 is always engaged with the output wheel 61 on the output shaft of the generator 6, and the generator 6 is not working at this time. Therefore, due to the braking effect of the generator 6, the driven return wheel 63 cannot rotate clockwise. Furthermore, this ensures that the teeth between the driven return wheel 63 and the firing wheel 62 are always misaligned, thus preventing the teeth between the firing rack 5 and the firing wheel 62 from realigning with the teeth of the firing rack 5. This avoids the possibility that the firing wheel 62 could slip and re-engage with the firing rack 5 under the pressure of the elastic element 66. In other words, even if the downward pressure of the wrench 7 is withdrawn, the firing wheel 62 and the firing rack 5 cannot re-engage. Preventing the teeth between the firing wheel 62 and the firing rack 5 from re-engaging and resetting prevents the reuse of a faulty stapler. This ensures that even after manually retracting the firing rack 5, a faulty stapler can still achieve the anti-reuse function and effect, effectively avoiding safety hazards caused by reusing a faulty stapler.

[0085] Because the firing wheel 62 cannot re-engage with the firing rack 5, even if the generator 6 drives the firing wheel 62 to rotate, it cannot smoothly drive the firing rack 5 forward and backward. This avoids the possibility of a jammed stapler being reused after manual retraction.

[0086] like Figure 21 As shown, the first misaligned joint 631 is a right-angled trapezoidal protrusion structure, and the second misaligned joint 621 is a trapezoidal groove structure that matches the right-angled trapezoidal protrusion and is engaged by the right-angled trapezoidal protrusion.

[0087] In detail, such as Figure 21 As shown, the second misaligned joint 621 is a trapezoidal protrusion, and the first misaligned joint 631 is a trapezoidal groove that matches the trapezoidal protrusion and is engaged by the trapezoidal protrusion.

[0088] Anastomosis / clamping process: Engaging the anastomosis handle 83 closes the staple cartridge assembly 82 to clamp the tissue to be cut and stapled.

[0089] Firing process: Squeeze the firing handle 84, one end of the firing handle 84 abuts against one end of the third switching trigger 32, causing the third switching trigger 32 to rotate until the third switching trigger 32 contacts the third switching switch SW3, causing the third switching switch SW3 to switch from the common terminal and normally closed terminal to the common terminal and normally open terminal, thereby triggering the firing generator 6 to rotate forward, driving the firing wheel 62 to rotate clockwise. The firing wheel 62 drives the firing rack 5 forward, the firing rack 5 pushes the firing rod forward, and the forward push of the firing rod drives the closed staple cartridge assembly 82 to perform the cutting and stapleing action, completing the cutting and stapleing of the tissue.

[0090] Automatic retraction process: Release the firing handle 84 to reset the third switching trigger 32 and disconnect it from the third switching switch SW3, so that the third switching switch SW3 switches back to the common terminal and normally closed terminal, thereby triggering the generator 6 to reverse, so as to drive the firing wheel 62 to rotate counterclockwise, thereby driving the firing rack 5 and the firing rod to retract.

[0091] In yet another embodiment, such as Figure 19 and Figure 22 As shown, the generator 6 is equipped with a transmission output wheel 61 mounted on the output shaft of the generator 6, and the firing wheel 62 meshes with the transmission output wheel 61.

[0092] 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:

[0093] Initialization steps: See the circuit section. Figure 1 The first switching switch SW1, the second switching switch SW2, and the third switching switch SW3 are all configured to connect the common terminal and the normally closed terminal (i.e., SW1-SW3 are connected from 1 to 3). The fourth switching switch SW0 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 4 is configured to connect the first terminal S4-1 and the second terminal S4-2. For the corresponding structural parts, see: Figure 11 and Figure 12 In Figure A, the second switching trigger 22 is placed in the first recess 52 of the firing rack 5, and the second trigger part 221 is separated from the second switching contact 21, corresponding to the conduction of the common terminal and normally closed terminal of the second switching switch SW2. See Figure 13 In Figure B, the first trigger part 121 of the first switching trigger 12 is separated from the first switching contact 11, corresponding to the first switching switch SW1 being connected between the common terminal and the normally closed terminal. See Figure 15 In Figure A, the firing handle 84 is moved away from the third switching trigger 32, and the third trigger part 321 is separated from the third switching contact 31, corresponding to the connection between the common terminal and the normally closed terminal of the third switching switch SW3. (See...) Figure 23 Safety cover 81 is installed on the main body of the stapler, corresponding to the conduction of the common terminal and normally closed terminal of the fourth changeover switch SW0. See Figure 18 and Figure 19 The current limiting trigger part 421 of the current limiting interruption trigger 42 contacts the current limiting interruption contact 41 of the current limiting interruption switch 4, corresponding to the conduction between the first terminal S4-1 and the second terminal S4-2 of the current limiting interruption switch 4.

[0094] Anastomosis steps: Pinch the anastomosis handle 83, see Figure 15 From diagram A to diagram B, after squeezing and engaging the engagement handle 83, the firing handle 84 will be adjacent to the first switching trigger 12. Simultaneously, see... Figure 23 Squeezing the anastomosis handle 83 will drive the staple cartridge assembly 82 to perform an anastomosis action (i.e., the staple cartridge assembly 82 will close).

[0095] Firing and current limiting procedure: Pinch the firing lever 84, see Figure 15 From diagram B to diagram C, the third switching trigger 32 is pushed against by the firing handle 84 and rotated, causing the third trigger part 321 to contact the third switching contact 31 to trigger. Figure 2 The third switching switch SW3 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 powered on, the generator 6 rotates forward, and drives the firing rack 5 to push forward.

[0096] Full-power firing steps: see Figure 12 From diagram A to diagram B, as the firing rack 5 is pushed forward, the second switching trigger 22 disengages from the first stop 52 until its bottom contacts the guide surface 54. At this point, the second switching trigger 22 undergoes a certain elastic deformation and twists, causing the second trigger part 221 to contact the second switching contact 21, thus achieving... Figure 3 When the second switching switch SW2 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 6 continues to drive the firing rack 5 forward with full force. The firing rack 5 will drive the firing rod forward, so that the firing rod drives the nail cartridge assembly 82 to perform nail engagement and cutting action.

[0097] Current limiting switch cut-off procedure: After the full-power firing step, see Figure 18 and Figure 19 The firing rack 5 continues to push forward until the front inner wall 511 of the firing rack 5 pushes open the current-limiting receiving part 422 of the current-limiting cut-off trigger 42, causing the current-limiting cut-off trigger 42 to deflect. At the same time, the current-limiting cut-off trigger 42 and the current-limiting reset switch 43 deflect synchronously, and the current-limiting trigger part 421 and the current-limiting cut-off contact 41 separate, thereby realizing... Figure 5 The first terminal S4-1 and the second terminal S4-2 of the medium-limit flow interruptor 4 are disconnected.

[0098] Firing to full extent: After the full-power firing step or the current-limiting switch cut-off step, the firing rack 5 continues to push forward, see... Figure 13 In Figure A, the inner front wall 511 of the first groove 51 of the firing rack 5 will actuate the first actuating part 122 of the first switching trigger 12, causing the first switching trigger 12 to deflect until the first trigger part 121 contacts the first switching contact 11, thereby triggering... Figure 4 The first switching switch SW1 is switched to conduct between the common terminal and the normally open terminal (i.e., switched from 1-3 conduction to 1-2 conduction), which forms an equipotential voltage across the generator 6 to block the current flow and stop the generator 6 from rotating.

[0099] Revert to initial steps: Release the firing lever 84, see Figure 15 From diagram C to diagram B, the third trigger section 321 springs back to its original position and separates from the third switching contact 31 to trigger... Figure 5 The third switching switch SW3 in the middle switches to conduct the common terminal and the normally closed terminal (that is, switches from 1-2 conduction to 1-3 conduction), the generator 6 reverses, and drives the generator rack 5 to retract.

[0100] Retracting steps: Fire rack 5 to retract, see... Figure 12 From diagram B to diagram A, the second switching trigger 22 gradually springs back to its original position and falls back to the first stop 52 until the second trigger part 221 separates from the second switching contact 21, thus achieving triggering. Figure 6 The second switching switch SW2 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 22 has not fully returned to the first avoidance position 52, and the firing rack 5 still has a certain amount of retraction space.

[0101] Steps to retract to the end: Fire rack 5 to continue retracting until you see... Figure 13 From diagram A to diagram B, and Figure 14 When the rack 5 retracts to its final position, the inner rear wall 512 of the first slide groove 51 will actuate the first actuating part 122, causing the first switching trigger 12 to deflect until the first trigger 121 separates from the first switching contact 11 and the contact is broken, thus achieving... Figure 7 The first switching switch SW1 is triggered to switch the common terminal and normally closed terminal to conduct (i.e., switch from 1-2 conduction to 1-3 conduction).

[0102] Warning procedure: Repeat the matching step and / or the current limiting step. If generator 6 does not start and cannot drive the rack forward or backward, it indicates... Figure 23If the staple cartridge assembly 82 has been used or is not installed, the instrument may become stuck during the flow restriction period. In such cases, it is necessary to replace the staple cartridge assembly 82 to avoid safety hazards caused by firing an empty staple cartridge. After completing the anastomosis procedure, the generator 6 cannot be started directly and a reset procedure is required.

[0103] Reset procedure: Manually toggle the current-limiting reset switch 43, see... Figure 22 , Figure 23 ,as well as Figure 18 Figures A and B show that the current-limiting trigger 42 is deflected in the reset direction until the current-limiting trigger 421 re-contacts the current-limiting contact 41, at which point the current-limiting trigger is achieved. Figure 8 The first terminal S4-1 and the second terminal S4-2 of the current limiting disconnect switch 4 are reconnected. After the reset step, the matching step and / or the firing current limiting step must be performed again to start the generator 6 to rotate and drive the firing rack 5 forward and backward.

[0104] Furthermore, the full-power firing step also includes:

[0105] The active retraction step during the firing process is as follows: Push the active stop button 67, push the second toggle part 125 of the first switching trigger 12, causing the first switching trigger 12 to rotate until the first trigger part 121 contacts the first switching contact 11, triggering the first switching switch SW1 to switch to the common terminal and normally open terminal to conduct, forming an equipotential voltage across the generator 6 to block the current flow, and stopping the generator 6 from rotating;

[0106] 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 5 continues to push forward until the first switching switch SW1 is triggered to switch the common terminal and normally open terminal to conduct, forming an equipotential voltage across the generator 6 to block the current flow, and the generator 6 stops rotating.

[0107] Furthermore, after the full-power firing step, the manual retraction step is also included: opening the safety cover 81, switching the fourth switch SW0 to connect the common terminal and the normally open terminal, stopping the generator 6, exposing the first limit force application part 641 of the active retraction wheel 64, connecting the second limit force application part 71 of the wrench 7 to the first limit force application part 641, manually rotating the wrench 7 to drive the active retraction wheel 64 to rotate, and the driven retraction wheel 63 to rotate synchronously and drive the firing rack 5 to retract.

Claims

1. A stapler switch structure, characterized in that, include: Mounting bracket (8) is formed with guide groove (87); The firing rack (5) is equipped with a second avoidance position (55); The second trigger switch (23) includes a guide connection portion (231) inserted into the guide slide opening (87), and a second contact portion (232) integrally formed with the guide connection portion (231) and accommodated by the second recess (55); and The second switching switch (SW2) is disposed adjacent to the second contact portion (232) and has a second switching contact (21) that is adjacent to and contacted by the second contact portion (232).

2. The anastomosis device switch structure according to claim 1, characterized in that, The firing rack (5) is provided with a guide surface (54), and a second stop (55) is provided at one end of the guide surface (54). A guide slope (53) is provided between the second stop (55) and the guide surface (54).

3. The anastomosis device switch structure according to claim 1, characterized in that, The second switching contact (21) is located at the top of the second contact part (232), and the guide connection part (231) is located on one side of the second switching switch (SW2).

4. The anastomosis device switch structure according to claim 1, characterized in that, The second avoidance (55) has a stop (551) on one side, and the second contact part (232) and the guide connection part (231) are in an L-shaped structure, with the guide connection part (231) and the stop (551) on the same side.

5. The anastomosis device switch structure according to claim 1, characterized in that, The firing rack (5) is provided with a first groove (51) having a front inner wall (511) and a rear inner wall (512).

6. The anastomosis device switch structure according to claim 5, characterized in that, The anastomosis device's toggle switch switching structure also includes: A flow-limiting disconnect switch (4) is provided with a flow-limiting disconnect contact (41). The current limiting trigger (42) is provided with a current limiting trigger part (421) adjacent to the current limiting contact (41), and extends into the first slide groove (51) and rotates against the front inner wall (511), so that the current limiting trigger part (421) contacts the current limiting receiving part (422) of the current limiting contact (41); and The current limiting reset switch (43) is connected at one end to the current limiting cut-off trigger (42) and is used to receive manual force to rotate the current limiting cut-off trigger (42) to reset, so that the current limiting trigger part (421) is separated from the current limiting cut-off contact (41).

7. A stapler, characterized in that, Includes the anastomosis switch structure as described in any one of claims 1-5.

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