Active rollback structure of anastomat and active rollback type anastomat

Abstract

The utility model relates to the technical field of anastomats, in particular to an active rollback structure of an anastomat and an active rollback type anastomat. The utility model relates to an anastomat active rollback structure, which comprises a percussion generator, a percussion rack and a percussion wheel, wherein the percussion wheel is respectively meshed and connected with the percussion generator and the percussion rack; the driven rollback wheel is in meshed connection with the percussion rack; and the driving rollback wheel is in meshed connection with the driven rollback wheel and is provided with a first limiting force application part which applies force from the outside to rotate the driving rollback wheel. According to the scheme, the driven rollback wheel and the driving rollback wheel are additionally arranged in the anastomat structure, the driving rollback wheel is driven by external force to achieve rapid rollback of the percussion rack, and the problem that a traditional electric anastomat is inconvenient to rollback in a fault or emergency scene is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to anastomat technical field especially, it relates to anastomat initiative retreat structure and initiative retreat type anastomat. BACKGROUND

[0002] With the continuous development of minimally invasive surgical technology, the application of electric anastomat in surgery is increasingly widespread. The electric anastomat generally drives the firing rack through the motor to realize the stapling, cutting and subsequent retreat operation of the tissue. However, in clinical use, if only rely on the motor to retreat, the following situations may be insufficient:

[0003] 1. Motor or transmission failure. When the motor fails or the transmission structure (such as rack and pinion) is stuck, simply relying on the motor to reverse often fails to complete the retreat operation in time, and even may exacerbate the stuck situation.

[0004] 2. Manual retreat demand in emergency. In the surgical environment, if the doctor needs to retreat the firing rack (for example, the instrument is positioned incorrectly or encounters unexpected resistance), and the motor cannot respond quickly, the lack of a convenient manual retreat mechanism will pose a safety hazard to the operation.

[0005] For example, Chinese patent CN106821437B discloses an anastomat control circuit and an electric anastomat, which realizes automatic control of the firing action through motor drive and gear transmission. Although this patent can complete the firing and a certain degree of retreat, the operation is still limited when the motor fails or needs to be quickly manually retreated, and it is difficult to meet the flexible demand for rack retreat in emergency situations. Therefore, how to add a set of initiative retreat structure on the basis of the motor and the rack transmission, so as to quickly drive the rack to retreat by external force in case of failure or emergency, has become a technical problem to be solved in the field. UTILITY MODEL CONTENTS

[0006] The utility model aims at the deficiency of prior art to provide anastomat initiative retreat structure and initiative retreat type anastomat, and aims at solving the problem of inconvenient retreat of traditional electric anastomat in failure or emergency scene.

[0007] The utility model realizes the above-mentioned purpose through the following technical scheme: anastomat initiative retreat structure, including firing motor, firing rack, and firing wheel meshing connection with firing motor and firing rack respectively; further including:

[0008] Driven retreat wheel, meshing connection with firing rack;

[0009] Active retreat wheel, meshing connection in driven retreat wheel, be equipped with by external force to rotate active retreat wheel first limit force part.

[0010] Further, the anastomat active back-off structure further comprises a guide shaft, the driven back-off wheel and the firing wheel are coaxially connected to the guide shaft.

[0011] Further, the driven back-off wheel and the firing wheel are movably connected to the guide shaft and can slide along the length direction of the guide shaft; the anastomat active back-off structure further comprises an elastic member sleeved on the guide shaft, and the elastic member acts on the end of the firing wheel away from the driven back-off wheel.

[0012] Further, the anastomat active back-off structure further comprises a wrench for rotating the active back-off wheel, the wrench is provided with a second limiting force applying part matched with the first limiting force applying part, so that the active back-off wheel is forced by the wrench through the second limiting force applying part. The first limiting force applying part is a force applying shaft, and the second limiting force applying part is a limiting connecting port. The force applying shaft is provided with an external thread, and the limiting connecting port is provided with an internal thread matched with the external thread. The wrench is provided with a pressing part, and the top of the driven back-off wheel is provided with a pressure receiving part abutted by the pressing part; the wrench is further used for pressing the driven back-off wheel and the firing wheel below the pressure receiving part by abutting the pressure receiving part.

[0013] An active back-off type anastomat comprises a main body and the anastomat active back-off structure according to any one of the preceding embodiments arranged on the main body.

[0014] Further, the active back-off type anastomat further comprises a safety cover plate which is detachably arranged on the main body and located at the top of the first limiting force applying part.

[0015] By arranging the driven back-off wheel and the active back-off wheel in addition to the firing motor, the firing rack and the firing wheel, and configuring the active back-off wheel with the first limiting force applying part driven by external force, the active back-off function of the anastomat is realized. Specifically, the main beneficial effects brought by the anastomat include:

[0016] 1. Fast manual back-off, getting rid of the dependence on the motor. Since the active back-off wheel is engaged with the driven back-off wheel, external force (such as through a wrench or other force applying device) can directly drive the driven back-off wheel to reversely drive the firing rack, no longer depending on the motor reverse rotation. This is particularly crucial when the motor fails or is seriously stuck, which can effectively shorten the fault handling time and reduce the risk of surgery.

[0017] 2. Compact structure, high space utilization. The driven back-off wheel is kept engaged with the firing rack and arranged coaxially or adjacently with the firing wheel; the active back-off wheel is engaged with the driven back-off wheel. This arrangement occupies a smaller space in the limited internal space of the anastomat, has high integration degree, and is convenient for installation and maintenance.

[0018] 3. Flexible external force interface. The active back-off wheel is provided with a first limiting force part, which can be matched with an external tool (such as a wrench) or a manual lever. Once back-off is needed, medical staff only need to connect the external force part to quickly rotate or push the active back-off wheel, complete the back-off action of the firing rack, and the operation is simple and convenient.

[0019] 4. Normal firing and emergency back-off. Under normal circumstances, the motor drives the firing rack through the firing wheel to realize stapling and cutting; only in the case of motor failure or emergency, the active back-off wheel and the driven back-off wheel intervene in the back-off process, which will not interfere with the daily firing function. This design ensures the multi-scene applicability of the device.

[0020] 5. Reduce the risk of failure and complications. With the active back-off function, doctors can quickly remove the device jam or remove the anastomat, reduce additional damage to the patient's tissue, and improve surgical safety.

[0021] In summary, the present scheme adds a driven back-off wheel and an active back-off wheel to the anastomat structure, and drives the active back-off wheel by an external force to realize the rapid back-off of the firing rack, effectively solving the problem of inconvenience in back-off of traditional electric anastomosers in the case of failure or emergency. It has simple structure, small space occupation, and meets the needs of normal firing and manual back-off, significantly improves the operability and safety of the anastomat in emergency situations, and has good application value and promotion prospect. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a circuit diagram of the initial state of the motor control circuit.

[0023] Figure 2 It is a circuit diagram of the firing current limiting state of the motor control circuit.

[0024] Figure 3 It is a circuit diagram of the full force firing state of the motor control circuit.

[0025] Figure 4 It is a circuit diagram of the firing to the bottom state of the motor control circuit.

[0026] Figure 5 It is a circuit diagram of the back-off initial state of the motor control circuit.

[0027] Figure 6 It is a circuit diagram of the back-off late stage state of the motor control circuit.

[0028] Figure 7 It is a circuit diagram of the back-off to the bottom state of the motor control circuit.

[0029] Figure 8 It is a circuit diagram of the reset state of the motor control circuit.

[0030] Figure 9 The circuit schematic diagram of the active back-off state in the firing process of the motor control circuit.

[0031] Figure 10 The circuit schematic diagram of the motor control circuit in the manual back-off process of opening the safety cover plate.

[0032] Figure 11 The structure exploded view and the local structure enlarged view of the switching structure of the anastomat.

[0033] Figure 12 The structure schematic diagram of the switching structure of the anastomat in two switching states.

[0034] Figure 13 The structure schematic diagram of the switching structure of the anastomat in two switching states.

[0035] Figure 14 The structure exploded view and the local structure enlarged view of the switching structure of the anastomat.

[0036] Figure 15 The structure schematic diagram of the anastomat in the anastomosis and firing states, between the anastomosis handle, the firing handle and the third switching switch.

[0037] Figure 16 The structure exploded view and the local structure enlarged view of the first switching trigger and the mounting frame.

[0038] Figure 17 The local structure schematic diagram of the first switching trigger in two states.

[0039] Figure 18 The structure exploded view and the structure schematic diagram of the current-limiting on-off switch in the non-disassembled state.

[0040] Figure 19 The structure schematic diagram of a part of the structure of the application.

[0041] Figure 20 The structure schematic diagram of the active back-off structure of the anastomat in two states.

[0042] Figure 21 The structure schematic diagram and the local structure enlarged view of the firing wheel and the driven back-off wheel of the application in two different views.

[0043] Figure 22 The structure schematic diagram of another part of the structure of the application.

[0044] Figure 23 The overall structure and the local structure enlarged view of the application.

[0045] Figure 24 Figure 1 is a schematic diagram of the connection structure between the active back-off wheel and the circuit board of the present application.

[0046] Figure 25 Figure 2 is a schematic diagram of the manual back-off process of the anastomat of the present application.

[0047] Figure 26 Figure 3 is a schematic diagram of the toggle switch switching structure of the anastomat of the present application.

[0048] Figure 27 Figure 4 is a schematic diagram of the structure of the anastomat of the present application. Figure 26 Figure 5 is a schematic diagram of the structure of the anastomat of the present application.

[0049] Figure 28 Figure 6 is a schematic diagram of the structure of the anastomat of the present application. DETAILED DESCRIPTION

[0050] The present application will be described in detail below with reference to the accompanying drawings of the embodiments of the present application.

[0051] As shown in Figure 1, a motor control circuit includes a firing motor 6, a current-limiting protection unit, and a plurality of switching switches, the switching switches including a first switching switch SW1, a second switching switch SW2, a third switching switch SW3, and a fourth switching switch SW0, and the switching switches each having 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. Figures 1-10 The current-limiting protection unit includes a current-limiting element, a thermal element, and a current-limiting on-off switch 4 connected in series, the current-limiting element being a current-limiting resistor R, the thermal element being a thermistor PTC, the current-limiting on-off switch 4 having a first terminal S4-1 and a second terminal S4-2, the first terminal S4-1 and the second terminal S4-2 being capable of being turned on and off, the second terminal S4-2 being electrically connected to one end of the current-limiting resistor R, and one end of the thermistor PTC being electrically connected to the other end of the current-limiting resistor R.

[0052] The third switching switch SW3 has its common terminal connected to the negative electrode of the firing motor 6, its normally open terminal connected to the other end of the thermistor PTC, and its normally closed terminal connected to the negative electrode of the power supply.

[0053] 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.

[0054] The first switching switch SW1 has its common terminal connected to the positive electrode of the firing motor 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 electrode of the power supply.

[0055]

[0056] ​The fourth switch SW0 has a common terminal connected to the positive terminal of the power supply and a normally open terminal.

[0057] Further, the motor control circuit is also connected in parallel with an indicator module. Specifically, one end of the indicator module is electrically connected to the normally closed terminal of the fourth switch SW0, and the other end of the indicator module is connected to the normally closed terminal of the first switch SW1 and / or the negative terminal of the power supply.

[0058] It should be noted that the motor control circuit can be used in the field of anastomat and other fields with motors.

[0059] An anastomat switch structure, as shown in Figure 11 , Figure 12 includes a firing rack 5, a second switch trigger 22, and a second switch SW2. Wherein:

[0060] The firing rack 5 has a first avoidance position 52 at one end;

[0061] The second switch trigger 22 is obliquely placed in the first avoidance position 52 and has a second trigger portion 221 on one side;

[0062] The second switch SW2 is adjacent to the second trigger portion 221 and has a second switch contact 21 adjacent to the second trigger portion 221 and contacted by the second trigger portion 221.

[0063] Further, the second switch SW2 has a plug-in interface 201 on one side, the second switch trigger 22 has a plug 222 that is tightly fitted into the plug-in interface 201, and the second switch trigger 22 is a resilient component with certain elastic deformation performance, which is used to produce elastic deformation when the second switch trigger 22 is separated from the first avoidance position 52, so that the bottom of the second switch trigger 22 is reset to be obliquely placed in the first avoidance position 52 when it is adjacent to the first avoidance position 52, and further separates the second trigger portion 221 and the second switch contact 21 of the second switch SW2.

[0064] Further, the second trigger part 221 of the second switch trigger 22 is in contact with the second switch contact 21 of the second switch SW2 by the elastic deformation of the bottom of the second switch trigger 22, which ensures that the second switch SW2 is always pressed. One side of the firing rack 5 is provided with a guide surface 54 which is in contact with the bottom of the second switch trigger 22 and extends to the first avoiding position 52. When the second switch trigger 22 is placed in the first avoiding position 52, the second trigger part 221 is separated from the second switch contact 21 of the second switch SW2. When the bottom of the second switch trigger 22 is separated from the first avoiding position 52 and in contact with the guide surface 54, the second trigger part 221 is in contact with the second switch contact 21 of the second switch SW2. Specifically, the sharp corner formed between the guide surface 54 and the guide slope 53 of the first avoiding position 52 abuts against the bottom of the second switch trigger 22. Since the installation wall of the second switch trigger 22 is tightly fitted and fixed to the second switch SW2 by the latch 222, the bottom of the second switch trigger 22 is elastically twisted by the abutment of the sharp corner, so that the second trigger part 221 of the second switch trigger 22 abuts against the second switch contact 21 of the second switch SW2, realizing the switching of the second switch SW2, i.e. switching the conduction of the second switch SW2 from the common terminal and the normally closed terminal to the common terminal and the normally open terminal.

[0065] A switch switching structure of an anastomat, comprising: Figures 26-28 an installation frame 8, a firing rack 5, a second trigger switch 23, and a second switch SW2. The installation frame 8 is formed with a guide sliding groove 87. The firing rack 5 is provided with a second avoiding position 55. The second trigger switch 23 comprises a guide connecting part 231 inserted into the guide sliding groove 87 and a second contact part 232 integrally formed with the guide connecting part 231 and accommodated by the second avoiding position 55. The second switch SW2 is arranged adjacent to the second contact part 232 and provided with a second switch contact 21 which is close to the second contact part 232 and in contact with the second contact part 232. The firing rack 5 is provided with a guide surface 54. The second avoiding position 55 is arranged at one end of the guide surface 54. A guide slope 53 is arranged between the second avoiding position 55 and the guide surface 54. Figure 26 Before firing, the second contact part 232 is separated from the second switch contact 21. During firing, the firing rack 5 advances, the second contact part 232 of the second trigger switch 23 is lifted, the guide connecting part 231 rises along the guide sliding groove 87, the second contact part 232 is separated from the second avoiding position 55, and the second contact part 232 is in contact with the second switch contact 21, as shown in FIG. B of Figure 26 , realizing the switching of the switch.

[0066] A switch switching structure of an anastomat, comprising:Figure 13 、 Figure 14 The first switching trigger 12 is movably connected to the anastomat, and is provided with a first trigger portion 121 adjacent to the first switching contact 11 and a first actuating portion 122 inserted into the first sliding slot 51.

[0067] The firing rack 5 is provided with a first sliding slot 51 having a front inner wall 511 and a rear inner wall 512.

[0068] The first switching switch SW1 is provided with the first switching contact 11.

[0069] The first switching trigger 12 is movably connected to the anastomat, and is provided with a first trigger portion 121 adjacent to the first switching contact 11 and a first actuating portion 122 inserted into the first sliding slot 51.

[0070] One side of the first actuating portion 122 is abutted by the front inner wall 511 to deflect the first switching trigger 12 towards the first trigger portion 121 to the direction close to the first switching contact 11, and the other side of the first actuating portion 122 is abutted by the rear inner wall 512 to deflect the first switching trigger 12 towards the first trigger portion 121 to the direction away from the first switching contact 11. The contact between the first trigger portion 121 and the first switching contact 11 is realized by abutting the first actuating portion 122 by the front inner wall 511 to deflect the first switching trigger 12. The disconnection between the first trigger portion 121 and the first switching contact 11 is realized by abutting the first actuating portion 122 by the rear inner wall 512 to deflect the first switching trigger 12 in the opposite direction. Specifically, the first switching trigger 12 is abutted by the first actuating portion 122 by the front inner wall 511 to deflect in the first direction, so that the first trigger portion 121 of the first switching trigger 12 contacts the first switching contact 11 of the first switching switch SW1, and further triggers the first switching switch SW1 to switch from the conduction between the common terminal and the normally closed terminal to the conduction between the common terminal and the normally open terminal. The first switching trigger 12 is abutted by the first actuating portion 122 by the rear inner wall 512 to deflect in the opposite direction of the first direction, so that the first trigger portion 121 of the first switching trigger 12 is away from and disconnected from the first switching contact 11 of the first switching switch SW1.

[0071] Further, the first switching trigger 12 is also provided with a hinge portion 123 for movably mounting the first switching trigger 12 on the anastomat. Specifically, the first switching trigger 12 deflects based on the hinge portion 123 as the pivot. The hinge portion 123 is a hinge hole, and the mounting shaft 86 of the mounting frame 8 is inserted into the hinge hole.

[0072] Further, as shown in Figure 18 、 Figure 19 、 Figure 22 The current-limiting on-off switch 4, the current-limiting on-off trigger 42 and the current-limiting reset knob 43 are further included. Wherein:

[0073] The current-limiting on-off switch 4 is provided with a current-limiting on-off contact 41;

[0074] The current-limiting on-off trigger 42 is provided with a current-limiting trigger part 421 adjacent to the current-limiting on-off contact 41, and a first sliding groove 51 extending into the firing rack 5 and being stopped by the front inner wall 511 to rotate, so that the current-limiting trigger part 421 is in contact with the current-limiting on-off contact 41.

[0075] The current-limiting reset knob 43 is connected to the current-limiting on-off trigger 42 at one end, and is used to receive manual force to rotate the current-limiting on-off trigger 42 to reset, so that the current-limiting trigger part 421 is separated from the current-limiting on-off contact 41, and the current-limiting trigger part 421 is reset into the first sliding groove 51. Specifically, the first end S4-1 of the current-limiting on-off switch 4 is arranged on the current-limiting on-off contact 41, and the second end S4-2 is arranged on the current-limiting trigger part 421; or the first end S4-1 is arranged on the current-limiting trigger part 421, and the second end S4-2 is arranged on the current-limiting on-off contact 41. In detail, see Figures 1-10 , the current-limiting on-off switch 4 is in a conductive state in the state of being ready to fire; after firing, the front inner wall 511 of the firing rack 5 stops the current-limiting on-off trigger part 421, so that the current-limiting on-off trigger 42 is deflected to disconnect the current-limiting trigger part 421 and the current-limiting on-off contact 41, thereby disconnecting the current-limiting on-off switch 4 and making the current-limiting protection unit open circuit. After the firing is completed and the firing rack 5 is retracted to the bottom, the current-limiting on-off switch 4 is still in a disconnected state and cannot be automatically reset, so the stapler cannot be fired again and the current-limiting reset knob 43 must be manually rotated to rotate the current-limiting on-off trigger 42 to completely reset. In this way, the current-limiting on-off switch 4 can effectively prevent misfiring, and at the same time, can effectively remind the operating doctor that the stapler has been fired and a new staple cartridge assembly 82 must be replaced, and the current-limiting on-off switch 4 must be reset manually before the stapler can be fired again, thereby effectively avoiding the situation of performing an empty staple cartridge anastomosis cutting on a staple cartridge assembly 82 that has been used, and the safety factor is higher.

[0076] Further, see Figure 14 , the first switching trigger 12 is provided with a limiting protrusion 124. See Figure 16 , the mounting frame 8 is provided with a limiting protrusion slot 85 into which the limiting protrusion 124 is clamped; the mounting frame 8 is further provided with a mounting shaft 86 hinged by the hinge part 123 of the first switching trigger 12. In detail, see Figure 14 , Figure 16 and Figure 17 , the limiting protrusion 124 is provided with two limiting protrusions 124a and 124b; the limiting protrusion slot 85 is provided with three limiting protrusion slots 85a, 85b and 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 seeFigure 16 and Figure 17 A figure, the convex point 124a and the convex point 124b are respectively clamped into the convex slot 85a and the convex slot 85b, so that the firing rack 5 keeps the first switching trigger 12 stable during the firing process, so that the first trigger part 121 and the first switching contact 11 are always separated, avoiding the first switching trigger 12 from running out of position and causing poor contact, that is Figures 1-3 , the first switching switch SW1 always maintains the state of 1-3 conduction, 1-2 disconnection. Until the firing rack 5 is fired to the bottom, the front inner wall 511 of the first sliding groove 51 pushes the first switching trigger 12 to deflect, at this time see Figure 17 B figure, the convex point 124a and the convex point 124b are respectively clamped into the convex slot 85b and the convex slot 85c, so that the first trigger part 121 and the first switching contact 11 are always in contact during the subsequent retreat process of the firing rack 5, that is Figures 4-6 , the first switching switch SW1 always maintains the state of 1-2 conduction, 1-3 disconnection, until the firing rack 5 retreats to the bottom, so that the rear inner wall 512 of the first sliding groove 51 pushes the first switching trigger 12 to deflect and reset.

[0077] An anastomat active stop structure, comprising the anastomat push switch switching structure of any one of the preceding description, further comprising an active stop push button 67 provided with a second sliding groove 671, for manually pushing the first switching trigger 12 to deflect; The first switching trigger 12 is also provided with a second push part 125 inserted into the second sliding groove 671. The second push part 125 is provided with a position avoidance gap 125a on the side close to the active stop push button 67. Specifically, the active stop push button 67 advances and retreats, and the second push part 125 of the first switching trigger 12 is pushed to make the first switching trigger 12 rotate, so as to turn on and off the first switching switch SW1.

[0078] An anastomat active retreat structure, as shown in Figures 19-23 , comprising a firing motor 6, a firing rack 5, and a firing wheel 62 engaged with the firing motor 6 and the firing rack 5 respectively; further comprising: a driven retreat wheel 63 and an active retreat wheel 64. The driven retreat wheel 63 is engaged with the firing rack 5. The active retreat wheel 64 is engaged with the driven retreat wheel 63, and the active retreat wheel 64 is provided with a first limiting force part 641 which is externally forced to rotate the active retreat wheel 64.

[0079] Further, the anastomat active back-off structure further comprises a guide shaft 65, the driven back-off wheel 63 and the firing wheel 62 are coaxially connected to the guide shaft 65. The driven back-off wheel 63 and the firing wheel 62 are movably connected to the guide shaft 65 and can slide along the length direction of the guide shaft 65. Further, the anastomat active back-off structure further comprises an elastic member 66 sleeved on the guide shaft 65, the elastic member 66 exerts elastic force on the end of the firing wheel 62 away from the driven back-off wheel 63. Further, the anastomat active back-off structure further comprises a wrench 7 for rotating the active back-off wheel 64, the wrench 7 is provided with a second limiting force applying part 71 matched with the first limiting force applying part 641, so that the wrench 7 can apply force to the active back-off wheel 64. The first limiting force applying part 641 is a force applying shaft, and the second limiting force applying part 71 is a limiting connecting port. The force applying shaft is provided with external threads, and the limiting connecting port is provided with internal threads matched with the external threads. The wrench 7 is provided with a pressing part 72, and the top of the driven back-off wheel 63 is provided with a pressure receiving part 632 abutted by the pressing part 72; the wrench 7 is further used for pressing the driven back-off wheel 63 and the firing wheel 62 below the pressure receiving part 632 by abutting the pressure receiving part 632 with the pressing part 72. The body of the anastomat is provided with a detachable safety cover plate 81, the safety cover plate 81 is located on the top of the first limiting force applying part 641, and opening the safety cover plate 81 can expose the first limiting force applying part 641 of the active back-off wheel 64, so that the wrench 7 can be connected to the active back-off wheel 64 and manually apply force and rotate the active back-off wheel 64.

[0080] In addition, as shown in Figure 24 , the anastomat of the present scheme further comprises a circuit board 88, the circuit board 88 is provided with a shaft connecting port 881, and the first limiting force applying part 641 of the active back-off wheel 64 is inserted into the shaft connecting port 881 of the circuit board 88, so that the active back-off wheel 64 can be installed on the circuit board 88 and can rotate relative to the circuit board 88. In the actual manual back-off process, the wrench 7 is screwed to the bottom of the first limiting force applying part 641 until the active back-off wheel 64 is slightly tensioned with the circuit board 88, and then the wrench 7 can be used to rotate the active back-off wheel 64. In addition, the active back-off wheel 64 can also be movably arranged in the circuit board 88 by arranging a bearing. The active back-off step is shown in Figure 25 , the safety cover plate 81 is opened in A, the wrench 7 is screwed into the firing gear 5 to separate the firing gear 5 from the firing rack 5 in B, and the wrench 7 is screwed to the bottom in the clockwise direction, and then the reset button is pressed to open the jaw in C.

[0081] It should be pointed out that the existing patent with publication number CN111202553A has two defects in the back-off scheme: 1. The gear needs to be pulled up, and in the state of instrument jamming, the resistance is extremely large, far exceeding the limit of safe operation of the instrument, and the process of pulling up the gear will cause serious shaking of the instrument, and further tear the tissue or blood vessels, causing surgical accidents. 2. The knob can be rotated clockwise and counterclockwise, which can make the rack retreat, but also make the rack advance. Repeated advancement of the rack may cause secondary damage to the tissue. In this scheme, the wrench 7 is screwed in a way to easily disconnect the firing wheel 62 from the firing rack 5 in the instrument jamming state.

[0082] A one-way transmission type anastomat, as shown in Figures 19-23 , comprises a firing motor 6, a firing rack 5, and a firing wheel 62; further comprising: a driven back-off wheel 63, a driving back-off wheel 64, a wrench 7, a guide shaft 65, and an elastic member 66. Among them:

[0083] The firing wheel 62 is meshingly connected with the firing motor 6 and the firing rack 5, respectively;

[0084] The driven back-off wheel 63 is coaxially connected with the firing wheel 62 and is adjacent to the firing wheel 62, and a first misaligned joint 631 is arranged on the end face close to the firing wheel 62;

[0085] The driving back-off wheel 64 is meshingly connected to the driven back-off wheel 63;

[0086] The wrench 7 is used to rotate the driving back-off wheel 64 and press down the driven back-off wheel 63;

[0087] The guide shaft 65 is coaxially arranged in the firing wheel 62 and the driven back-off wheel 63, respectively, so that the firing wheel 62 and the driven back-off wheel 63 can slide on the guide shaft 65;

[0088] The elastic member 66 is sleeved on the guide shaft 65 and acts on the firing wheel 62, so that the firing wheel 62 is maintained at a predetermined position on the guide shaft 65 that can be meshed with the firing rack 5, and provides a restoring force for the firing wheel 62 when the firing wheel 62 is pressed down;

[0089] Among them, the end face of the firing wheel 62 close to the driven back-off wheel 63 is provided with the second misaligned joint 621 which is engaged by the first misaligned joint 631, so that the teeth of the firing wheel 62 are misaligned with the teeth of the driven back-off wheel 63.

[0090] Further, as shown in Figure 21As shown in the A and B of the drawings, the first misalignment joint 631 is a misalignment protrusion 631a, and the second misalignment joint 621 is a misalignment groove 621a. When the misalignment protrusion 631a is inserted into the misalignment groove 621a, the teeth of the firing wheel 62 and the teeth of the driven back-off wheel 63 are misaligned with each other. One end of the misalignment protrusion 631a is provided with a first one-way limiting surface 631a1, and the other end is provided with a first one-way guide inclined surface 631a2. One end of the misalignment groove 621a is provided with a second one-way limiting surface 621a1 which is abutted by the first one-way limiting surface 631a1, and the other end is provided with a second one-way guide inclined surface 621a2 which is abutted by the first one-way guide inclined surface 631a2. Further, when the misalignment protrusion 631a is inserted into the misalignment groove 621a, and the driven back-off wheel 63 rotates in the direction in which the firing rack 5 advances (clockwise), the driven back-off wheel 63 rotates synchronously with the firing wheel 62. When the misalignment protrusion 631a is inserted into the misalignment groove 621a, and the driven back-off wheel 63 rotates in the direction in which the firing rack 5 retreats (counterclockwise), the driven back-off wheel 63 can rotate relatively with the firing wheel 62, such as the firing wheel 62 is stationary and the driven back-off wheel 63 rotates, to realize one-way transmission.

[0091] Further, the top of the driving back-off wheel 64 is provided with a first limiting force applying part 641, the wrench 7 is provided with a second limiting force applying part 71 which is matched with the first limiting force applying part 641 to apply force to the driving back-off wheel 64 through the wrench 7, and the top of the driving back-off wheel 64 is provided with a safety cover plate 81. Specifically, the second limiting force applying part 71 is a limiting connecting port with internal threads, and the first limiting force applying part 641 is a force applying shaft which is sleeved in the limiting connecting port and is provided with external threads which are matched with the internal threads.

[0092] Manual rollback process: open the safety cover 81, make the force shaft on the top of the main rollback wheel 64 exposed, the limiting connection port of the wrench 7 is inserted into the force shaft and tightened until the wrench 7 is pressed on the main rollback wheel 64, and the pressing part 72 of the wrench 7 is pressed on the top of the driven rollback wheel 63 during the pressing process, so as to press the driven rollback wheel 63 and the firing wheel 62 for a certain stroke, until the firing wheel 62 is separated from the firing rack 5, and the elastic element 66 is pressed to generate a reset elastic force, after the firing wheel 62 is separated from the firing rack 5, the driven rollback wheel 63 is rotated, so that the offset convex 631a is clamped into the offset slot 621a, at this time, the teeth between the firing wheel 62 and the driven rollback wheel 63 are offset (i.e. the gears are offset), because the driven rollback wheel 63 is still engaged with the firing rack 5, so the teeth between the firing wheel 62 and the firing rack 5 are also offset, and under the action of the elastic element 66, the firing wheel 62 is clamped on the bottom of the firing rack 5. At this time, due to the structural design of the first one-way guide slope 631a2 and the second one-way guide slope 621a2, if the wrench 7 is rotated counterclockwise to rotate the driven rollback wheel 63 counterclockwise, the driven rollback wheel 63 can still continue to rotate counterclockwise, so that the firing rack 5 drives the firing rod to continue to rollback, ensuring the function of manual rollback.

[0093] On the other hand, if the wrench 7 is rotated clockwise to rotate the driven rollback wheel 63 clockwise, because of the structural design of the first one-way limiting surface 631a1 and the second one-way limiting surface 621a1, the driven rollback 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 firing motor 6, and at this time the firing motor 6 does not work, so the driven rollback wheel 63 cannot rotate clockwise due to the influence of the brake of the firing motor 6. Further, the teeth between the driven rollback wheel 63 and the firing wheel 62 are always offset, and the teeth between the firing rack 5 and the firing wheel 62 are always offset, which avoids the possibility that the teeth of the firing wheel 62 and the teeth of the firing rack 5 are re-aligned, so that the firing wheel 62 re-slides and engages the firing rack 5 under the pressing of the elastic element 66, i.e. the downward pressure of the wrench 7 is removed, and the firing wheel 62 and the firing rack 5 cannot be re-engaged. Preventing the teeth between the firing wheel 62 and the firing rack 5 from being re-engaged, avoiding the possibility that the malfunctioning stapler is re-used, so that the malfunctioning stapler can also achieve the functions of preventing reuse after the firing rack 5 is manually rolled back, effectively avoiding the safety hazards caused by reusing the malfunctioning stapler.

[0094] Because the firing wheel 62 cannot be re-engaged with the firing rack 5, even if the firing motor 6 drives the firing wheel 62 to rotate, it cannot smoothly drive the firing rack 5 to advance and retreat. Further, the possibility that the malfunctioning stapler is re-used after manual rollback is avoided.

[0095] Specifically, as shown in Figure 21 the first misaligned joint 631 is a right-angled trapezoidal protrusion structure, and the second misaligned joint 621 is a trapezoidal groove structure matched with the right-angled trapezoidal protrusion and clamped by the right-angled trapezoidal protrusion.

[0096] In detail, as shown in Figure 21 the second misaligned joint 621 is a trapezoidal protrusion, and the first misaligned joint 631 is a trapezoidal groove matched with the trapezoidal protrusion and clamped by the trapezoidal protrusion.

[0097] Anastomosis / clamping process: engage the anastomosis handle 83 to close the staple cartridge assembly 82 to clamp the tissue to be cut and stapled.

[0098] Firing process: pinch the firing handle 84, one end of the firing handle 84 abuts against one end of the third switching trigger 32, which rotates the third switching trigger 32 until the third switching trigger 32 contacts the third switching switch SW3, which switches the conduction of the third switching switch SW3 from the common terminal and the normally closed terminal to the common terminal and the normally open terminal, thereby triggering the firing motor 6 to rotate forward to drive the firing gear 62 to rotate clockwise, the firing gear 62 drives the firing rack 5 to advance, the firing rack 5 pushes the firing rod to advance, and the advancing firing rod drives the closed staple cartridge assembly 82 to perform the cutting and stapling action, completing the cutting and stapling of the tissue.

[0099] Automatic back-off process: release the firing handle 84, so that the third switching trigger 32 resets and breaks contact with the third switching switch SW3, which switches the conduction of the third switching switch SW3 back to the common terminal and the normally closed terminal, thereby triggering the firing motor 6 to reverse, driving the firing gear 62 to rotate counterclockwise, and thereby driving the firing rack 5 and the firing rod to retract.

[0100] In yet another embodiment, as shown in Figure 19 and Figure 22 the firing motor 6 is provided with a transmission output wheel 61 mounted on the output shaft of the firing motor 6, and the firing gear 62 is engaged with the transmission output wheel 61.

[0101] An anastomat firing control method, comprising the following steps: initialization step, anastomosis step, firing current limiting step, full force firing step, current limiting switch cut-off step, firing to the end step, back-off initial step, back-off later step, back-off to the end step. Wherein:

[0102] Initialization step: see Figure 1, the first, second and third switching switches SW1, SW2 and SW3 are configured to be conductive between the common terminal and the normally closed terminal (i.e. SW1-SW3 are 1-3 conductive), and the fourth switching switch SW0 is also configured to be conductive between the common terminal and the normally closed terminal (i.e. SW0 is 1-2 conductive); the current-limiting on-off switch 4 is configured to be conductive between the first terminal S4-1 and the second terminal S4-2. Corresponding structural parts: see Figure 11 and Figure 12 A, the second switching trigger 22 is placed in the first avoiding position 52 of the firing rack 5, the second trigger part 221 is separated from the second switching contact 21, and the corresponding second switching switch SW2 is conductive between the common terminal and the normally closed terminal. See Figure 13 B, the first trigger part 121 of the first switching trigger 12 is separated from the first switching contact 11, and the corresponding first switching switch SW1 is conductive between the common terminal and the normally closed terminal. See Figure 15 A, the firing handle 84 is away from the third switching trigger 32, the third trigger part 321 is separated from the third switching contact 31, and the corresponding third switching switch SW3 is conductive between the common terminal and the normally closed terminal. See Figure 23 , the safety cover plate 81 is arranged on the main body of the anastomat, and the corresponding fourth switching switch SW0 is conductive between the common terminal and the normally closed terminal. See Figure 18 and Figure 19 , the current-limiting trigger part 421 of the current-limiting on-off trigger 42 is in contact with the current-limiting on-off contact 41 of the current-limiting on-off switch 4, and the corresponding current-limiting on-off switch 4 is conductive between the first terminal S4-1 and the second terminal S4-2.

[0103] Anastomosis step: pinch the anastomosis handle 83, see Figure 15 A to B, after pinching the anastomosis handle 83, the firing handle 84 will be adjacent to the first switching trigger 12, and see Figure 23 , pinching the anastomosis handle 83 will drive the staple cartridge assembly 82 to perform anastomosis action (i.e. the staple cartridge assembly 82 will be closed).

[0104] Firing current-limiting step: pinch the firing handle 84, see Figure 15 B to C, the third switching trigger 32 will be pushed by the firing handle 84 to rotate, so that the third trigger part 321 is in contact with the third switching contact 31 to trigger Figure 2 the third switching switch SW3 to be conductive between the common terminal and the normally open terminal (i.e. 1-2 conductive), at this time the current-limiting protection unit is powered on, the firing motor 6 is rotated in the forward direction, and drives the firing rack 5 to push forward;

[0105] Full-power firing step: see Figure 12From A to B, the firing rack 5 is pushed forward, the second switching trigger 22 is out of the first avoiding position 52, until the bottom of the second switching trigger 22 contacts with the guide surface 54, at this time, the second switching trigger 22 is elastically deformed and twisted, so that the second trigger part 221 contacts with the second switching contact 21, realizing Figure 3 the second switching switch SW2 in the middle is switched to the conduction between the common end and the normally open end (i.e. from 1-3 conduction to 1-2 conduction), the current limiting protection unit is disconnected, the firing motor 6 continues to drive the firing rack 5 to push forward at full power, the firing rack 5 drives the firing rod to push forward, so that the firing rod drives the nail cartridge assembly 82 to perform the nail cutting action;

[0106] The current limiting switch is disconnected: 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 the current limiting receiving part 422 of the current limiting on-off trigger 42, so that the current limiting on-off trigger 42 is deflected, at the same time, the current limiting on-off trigger 42 is deflected synchronously with the current limiting reset knob 43, and the current limiting trigger part 421 and the current limiting on-off contact 41 are separated, thereby realizing Figure 5 the disconnection between the first end S4-1 and the second end S4-2 of the current limiting on-off switch 4 in the middle.

[0107] The firing to the end step: after the full power firing step or the current limiting switch disconnection step, the firing rack 5 continues to push forward, see Figure 13 A of the A, the front inner wall 511 of the first sliding groove 51 of the firing rack 5 will actuate the first actuating part 122 of the first switching trigger 12, so that the first switching trigger 12 is deflected, until the first trigger part 121 contacts with the first switching contact 11, thereby triggering Figure 4 the first switching switch SW1 in the middle to switch to the conduction between the common end and the normally open end (i.e. from 1-3 conduction to 1-2 conduction), so that the firing motor 6 forms an equipotential voltage between the two ends to block the current flow, and the firing motor 6 stops rotating.

[0108] The initial step of backtracking: the firing handle 84 is released, see Figure 15 from C to B, the third trigger part 321 is reset and separated from the third switching contact 31, so as to trigger Figure 5 the third switching switch SW3 in the middle to switch to the conduction between the common end and the normally closed end (i.e. from 1-2 conduction to 1-3 conduction), so that the firing motor 6 reverses and drives the firing rack 5 to retreat.

[0109] The latter step of backtracking: the firing rack 5 retreats, see Figure 12 from B to A, the second switching trigger 22 gradually resets and falls back to the first avoiding position 52, until the second trigger part 221 is separated from the second switching contact 21, so as to trigger Figure 6The second switch SW2 is switched to the conduction between the common terminal and the normally closed terminal (i.e. switched back from 1-2 conduction to 1-3 conduction). At this time, the second switch trigger 22 is not completely reset to the first reset position 52, and the firing rack 5 still has a certain backstroke space.

[0110] Backstroke to the bottom step: the firing rack 5 continues to backstroke until the Figure 13 from A to B, and Figure 14 that is, when the firing rack 5 backs to the bottom, the rear inner wall 512 of the first sliding groove 51 will push the first push part 122, so that the first switch trigger 12 is deflected until the first trigger part 121 is separated from the first switch contact 11 and the contact is disconnected, realizing Figure 7 triggering the first switch SW1 to switch to the conduction between the common terminal and the normally closed terminal (i.e. switched back from 1-2 conduction to 1-3 conduction).

[0111] Warning step: the anastomosis step and / or the firing current limiting step are performed again. If the firing motor 6 cannot be started and cannot drive the rack to advance and retreat, it indicates that Figure 23 the staple cartridge assembly 82 may have been used, or the instrument may be stalled during current limiting, so it is necessary to realize whether to replace a new staple cartridge assembly 82 to avoid the safety hazard caused by the empty staple cartridge firing. After the anastomosis step is performed, the firing motor 6 cannot be directly started, and the reset step needs to be performed.

[0112] Reset step: manually push the current limiting reset knob 43, see Figure 22 , Figure 23 , and Figure 18 A and B of the A and B, so that the current limiting on-off trigger 42 is deflected in the reset direction until the current limiting trigger part 421 recontacts the current limiting on-off contact 41. At this time, the first end S4-1 and the second end S4-2 of the current limiting on-off switch 4 in the Figure 8 are reconnected. After the reset step, the anastomosis step and / or the firing current limiting step are performed again, and the firing motor 6 can be started to rotate to drive the firing rack 5 to advance and retreat.

[0113] Further, the full-power firing step further includes:

[0114] Active backstroke step in the firing process: push the active stop knob 67 to push the second push part 125 of the first switch trigger 12, so that the first switch trigger 12 is rotated until the first trigger part 121 contacts the first switch contact 11, triggering the first switch SW1 to switch to the conduction between the common terminal and the normally open terminal, and the equal potential voltage is formed between the two ends of the firing motor 6 to block the current flow, so that the firing motor 6 stops rotating;

[0115] The firing to the bottom step is: after the current limiting switch is turned off, if the firing process is not actively returned, the firing rack 5 continues to push forward until the first switch SW1 is switched to the conduction of the common end and the normally open end, the potential voltage is formed at both ends of the firing motor 6 to block the current flow, and the firing motor 6 stops rotating.

[0116] Further, the full-power firing step further includes a manual return step: open the safety cover plate 81, the fourth switch SW0 is switched to the conduction of the common end and the normally open end, the firing motor 6 is stopped, the first limiting force applying part 641 of the active return wheel 64 is exposed, the second limiting force applying part 71 of the wrench 7 is connected to the first limiting force applying part 641, the wrench 7 is manually rotated to drive the active return wheel 64 to rotate, the driven return wheel 63 is synchronously rotated and drives the firing rack 5 to return.

Claims

1. A stapler active retraction structure, 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 has a first limiting force application part (641) for rotating the active return wheel (64) by external force.

2. The active retraction structure of the stapler according to claim 1, characterized in that, The active retraction structure of the stapler also includes a guide shaft (65), and the driven retraction wheel (63) and the firing wheel (62) are coaxially connected to the guide shaft (65).

3. The active retraction structure of the stapler according to claim 2, characterized in that, The driven return wheel (63) and the firing wheel (62) are movably connected to the guide shaft (65); The active retraction structure of the stapler also includes an elastic element (66) sleeved on the guide shaft (65), which acts on the end of the firing wheel (62) away from the driven retraction wheel (63).

4. The active retraction structure of the stapler according to claim 1, characterized in that, The active retraction structure of the stapler also includes a wrench (7) for rotating the active retraction wheel (64). The wrench (7) is provided with a second limiting force application part (71) that matches the first limiting force application part (641) so that the active retraction wheel (64) is subjected to force by the wrench (7).

5. The active retraction structure of the stapler according to claim 4, characterized in that, The first limiting force application part (641) is a force application shaft, and the second limiting force application part (71) is a limiting connection port.

6. The active retraction structure of the stapler according to claim 5, characterized in that, The force-applying shaft has an external thread, and the limiting connection port has an internal thread that matches the external thread.

7. The active retraction structure of the stapler according to claim 4, characterized in that, 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 against the pressure part (632) through the holding part (72).

8. An active retraction anastomosis device, characterized in that, It includes a main body and an active retraction structure of the stapler as described in any one of claims 1-7 disposed on the main body.

9. The active retraction anastomosis device according to claim 8, characterized in that, This active retraction stapler also includes: The safety cover (81) is detachably mounted on the main body and located on top of the first limiting force application part (641).

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