Electric tube type anastomat

Abstract

The utility model discloses an electric tube type anastomat which comprises an anastomat body and further comprises a gun body arranged on the anastomat body in a sleeved mode, the gun body comprises a supporting frame, a percussion device and a battery assembly, the percussion device and the battery assembly are arranged in the supporting frame, and the battery assembly is electrically connected with the percussion device. The gun barrel is fixedly connected with one end of the gun body, and a first connecting rod is arranged in the gun barrel; the gun head is fixedly connected with the gun body, the gun head comprises a nail bin, the nail bin is connected with one end of the first connecting rod in a matched mode, and the other end of the first connecting rod is fixedly connected with the percussion device. Through the arrangement of the motor and the transmission device, the transmission device is driven by the motor to push out the titanium nail for suturing, so that the hand fatigue of an operator is reduced, and the operation error is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of staplers, in particular to an electric tubular stapler. Background Art

[0002] A stapler is a common medical device that replaces traditional suture equipment during surgery, improving the suture efficiency, being more convenient to operate, and reducing the occurrence of postoperative complications. Therefore, staplers are widely used clinically. There are various types of staplers, but their main working principles are basically the same, that is, using titanium nails to sever or anastomose tissues. According to the operation characteristics and specific operation parts, staplers can be divided into skin staplers, round tubular staplers, rectal staplers, etc. Among them, round tubular staplers are mainly used for suturing physiological tissues such as the digestive tract.

[0003] However, in the actual use process of half of the round tubular staplers, the firing is mainly achieved by operating the firing handle. After firing, the firing handle needs to be held for 20 to 30 seconds. The whole process is manually operated, making it difficult to accurately control the holding time, and it is easy to cause hand fatigue and even operation errors during the strong holding process. Summary of the Utility Model

[0004] In view of the deficiencies of the prior art, the utility model provides an electric tubular stapler that uses a motor to drive the suture to reduce errors caused by manual operation.

[0005] The utility model is realized through the following technical solutions:

[0006] An electric tubular stapler, comprising:

[0007] A stapler main body;

[0008] A barrel assembly, one end of the stapler main body is connected to the barrel assembly, and the barrel assembly includes a first connecting rod;

[0009] A gun head assembly, the gun head assembly is connected to the other end of the barrel assembly;

[0010] A gun body assembly, the gun body assembly includes a support frame sleeved on the stapler main body and a firing device and a battery assembly arranged on the support frame. The battery assembly is used to supply power to the firing device, and the first connecting rod pushes out the titanium nails in the gun head assembly for suturing under the drive of the firing device;

[0011] The firing device includes a trigger mechanism, a transmission mechanism, and a motor. The motor is connected to the transmission mechanism, the first connecting rod is fixedly connected to the transmission mechanism, and the motor is used to drive the first connecting rod;

[0012] The trigger mechanism includes a first trigger, a first microswitch, a second microswitch and a main board. The transmission mechanism includes a cam. The battery assembly is electrically connected to the main board. The first microswitch and the second microswitch are both electrically connected to the main board. The main board is electrically connected to the motor;

[0013] The first trigger is rotatably arranged on the support frame. The first trigger can rotate from a first position to a second position. When the first trigger rotates to the second position, it can trigger the first microswitch to make the main board control the motor to start;

[0014] The cam can rotate from a first position to a second position under the drive of the motor. When the cam rotates to the second position, it can trigger the second microswitch to make the main board control the motor to stop.

[0015] Further, the cam includes a protrusion. When the cam rotates to the second position, the protrusion can abut against the second microswitch and trigger the second microswitch.

[0016] Further, the transmission mechanism includes a lever and a firing link rotatably connected to the lever. The cam includes a transmission part integrally formed with the protrusion. The output shaft of the motor is fixedly connected to the cam. The lever is rotatably arranged on the support frame. The lever abuts against the transmission part of the cam. During the process of the cam rotating from the first position to the second position, the transmission part pushes the lever to rotate. The firing link is fixedly connected to the first connecting rod.

[0017] Further, the first trigger is integrally formed and includes a pressing part and a triggering part. The pressing part is exposed outside the gun body assembly. By pressing the pressing part, the user can drive the first trigger to rotate and drive the triggering part to abut against the first microswitch and trigger the first microswitch.

[0018] Further, the trigger mechanism includes a second trigger. The second trigger is rotatably installed on the support frame and partially exposed outside the gun body assembly. The second trigger is used to limit the first trigger.

[0019] Further, the second trigger includes an abutting part, a clamping part and a rotating hole. The support frame protrudes with a rotating shaft passing through the rotating hole. The second trigger can rotate around the rotating shaft;

[0020] When the second trigger is in the locked state, the clamping part is clamped with the support frame, and the abutting part abuts against the first trigger;

[0021] When the second trigger is in the released state, the clamping portion disengages from the support frame, and the abutting portion disengages from the first trigger.

[0022] Further, the first microswitch, the second microswitch, and the main board are all installed in the support frame.

[0023] Further, the gun head assembly further includes a puncture shaft, the barrel further includes a second connecting rod, one end of the second connecting rod is fixedly connected to the puncture shaft, and the other end is fixedly connected to the stapler main body. The gun body assembly further includes an indicating area. The stapler main body includes a screw rod and an adjusting nut. One end of the screw rod is fixedly connected to the second connecting rod, and the other end is rotatably connected to the adjusting nut.

[0024] Further, the stapler main body includes a screw rod and an adjusting nut. One end of the screw rod is fixedly connected to the second connecting rod, and the other end is rotatably connected to the adjusting nut.

[0025] Further, the gun body assembly further includes an indicating area and a dial. The indicating area includes an indicating window and an indicating needle disposed in the indicating window. The indicating window is fixedly connected to the support frame, and the indicating needle is rotatably connected to the support frame. The dial is fixedly connected to the screw rod. The front end of the dial is engaged with the indicating needle. When the dial moves, it can drive the indicating needle to rotate.

[0026] Compared with the prior art, the advantages of the present invention are as follows:

[0027] 1. By providing a motor and a transmission device, the motor drives the transmission device to push out the titanium nails for suturing, so that the surgical staff can reduce hand fatigue and thus reduce operation errors.

[0028] 2. By providing the second trigger as a safety trigger, when the second trigger is not toggled, the second trigger is in the locked state, so that the first trigger cannot be pressed, and misoperation will not occur.

[0029] 3. By providing an indicating needle synchronized with the screw rod, the surgical staff can accurately know whether the stapler has reached the state where it can be sutured.

[0030] 4. A second microswitch is provided. When the titanium nails are completely withdrawn, the second microswitch is triggered by the cam, so that the motor stops working. It is not necessary for the operator to press the stop switch additionally, reducing human error and realizing precise suturing. Description of the Drawings

[0031] Figure 1 It is a structural diagram of an electric tubular stapler according to an embodiment of the present invention;

[0032] Figure 2 This is an exploded schematic diagram of an electric tubular stapler according to an embodiment of the utility model;

[0033] Figure 3 Another exploded schematic diagram of an electric tubular stapler according to an embodiment of the utility model;

[0034] Figure 4 The present invention is a circuit diagram of an electric tubular stapler according to an embodiment of the present invention.

[0035] Description of reference numerals: 1. stapler body; 10. screw rod; 11. adjusting nut; 11b. fastening ring; 11a. adjusting nut cover; 12. spring; 13. screw; 14. adjusting block; 2. gun body assembly; 20. firing device; 20a. trigger mechanism; 20b. transmission mechanism; 20c. motor; 21. battery assembly; 22. support frame; 22a. first support frame; 22b. second support frame; 23. indication area; 23a. indication window; 23b. indication needle; 24. housing; 24a. first housing; 24b. second housing; 3. gun barrel assembly; 30a. first connecting rod; 4. gun head assembly; 40. staple cartridge; 205. first trigger; 206. first micro switch; 210 , torsion spring; 211, first trigger link; 207, second trigger; 212, second trigger link; 201, cam; 202, lever; 203, firing link; 209, supporting sleeve; 27, first pin; 26, second pin; 208, second micro switch; 28, main board; 24, paddle; 28a, indicator light; 30b, first connecting short rod; 31, second connecting rod; 32, tube body; 31a, metal connecting rod; 41, puncture shaft; 42, puncture head; 46, retaining spring; 43, nail support; 47, titanium nail; 44, knife washer; 45, cap; 48, nail magazine sleeve; 21c, rotating hole; 21a, abutment portion; 21b, clamping portion; 60, protective cover; 61, protective sleeve. DETAILED DESCRIPTION

[0036] The technical solution of the utility model will be further described in detail below in conjunction with the preferred embodiments and their accompanying drawings in a non-limiting manner. In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation of the present utility model.

[0037] As Figures 1 to 4 shown, an electric tube-shaped stapler according to an embodiment of the present utility model includes a stapler main body 1,

[0038] a gun body assembly 2, a barrel assembly 3, and a gun head assembly 4. The gun body assembly 2 is sleeved on the stapler main body 1. The stapler main body 1 is matingly connected to one end of the barrel assembly 3. The barrel assembly 3 includes a first connecting rod 30a. The gun head assembly 4 is connected to the other end of the barrel assembly 3. The gun body assembly 2 includes a support frame 22 sleeved on the stapler main body 1, a firing device 20, and a battery assembly 21 provided on the support frame 22. The battery assembly 21 is used to supply power to the firing device 20. The first connecting rod 30a pushes out the titanium staples 47 in the gun head assembly 4 for suturing under the drive of the firing device 20.

[0039] Specifically, the stapler main body 1 includes a screw rod 10, a spring 12, and an adjusting nut 11. The adjusting nut 11 is rotatably matingly connected to one end of the screw rod 10. An adjusting block 14 is also fixed to the screw rod 10 with a screw 13, and a spring 12 is sleeved between the adjusting block 14 and the adjusting nut 11. At the same time, a fastening ring 11b is also sleeved on the adjusting nut 11 to prevent the adjusting nut 11 from loosening. An adjusting nut cover 11a is also installed on the adjusting nut 11.

[0040] The gun body assembly 2 includes a support frame 22, a housing 24, a firing device 20 disposed within the support frame 22, and a battery assembly 21. The support frame 22 includes a first support frame 22a and a second support frame 22b. The first support frame 22a and the second support frame 22b are snap-fitted and sleeved on the screw 10. At the same time, the tails of the first support frame 22a and the second support frame 22b are rotatably connected to the adjusting nut 11. The housing 24 includes a first housing 24a and a second housing 24b. The first housing 24a and the second housing 24b are respectively snap-fitted and fixed on the first support frame 22a and the second support frame 22b. By rotating the adjusting nut 11, the screw 10 can be telescoped.

[0041] The firing device 20 includes a trigger mechanism 20a, a transmission mechanism 20b, and a motor 20c. The motor 20c is mated with the transmission mechanism 20b. The first connecting rod 30a is fixedly connected to the transmission mechanism 20b. The motor 20c is used to drive the first connecting rod 30a.

[0042] The trigger mechanism 20a includes a first trigger 205, a first microswitch 206, a second microswitch 208, and a main board 28. The transmission mechanism 20b includes a cam 201. The battery assembly 21 is electrically connected to the main board 28. Both the first microswitch 206 and the second microswitch 208 are electrically connected to the main board 28. The main board 28 is electrically connected to the motor 20c.

[0043] The cam 201 can rotate from a first position to a second position under the drive of the motor 20c. When the cam 201 rotates to the second position, it can trigger the second microswitch 208 to cause the main board 28 to control the motor 20c to stop.

[0044] Specifically, the first trigger 205 is rotatably disposed on the support frame 22. The first trigger 205 can rotate from a first position to a second position. When the first trigger 205 rotates to the second position, it can trigger the first microswitch 206 to cause the main board 28 to control the motor 20c to start. At the same time, the trigger mechanism 20a further includes a torsion spring 210 and a first trigger link 211. One end of the torsion spring 210 abuts against the support frame 22, and the other end abuts against the first trigger 205. The first trigger link 211 is slidably disposed within the support frame 22 and is rotatably connected to the first trigger 205. This enables the first trigger 205 to be reset after being pressed without falling out. The first trigger 205 is integrally formed and includes a pressing portion and a triggering portion. The pressing portion is exposed outside the gun body assembly 2. The user can drive the first trigger 205 to rotate and drive the triggering portion to abut against the first microswitch 206 and trigger the first microswitch 206 by pressing the pressing portion.

[0045] The trigger mechanism 20a includes a second trigger 207 which is rotatably mounted on the support frame 22 and partially exposed outside the gun body assembly 2. The second trigger 207 is used to limit the first trigger 205. The second trigger 207 includes an abutting portion 21a, a clamping portion 21b and a rotating hole 21c. The support frame 22 protrudes with a rotating shaft passing through the rotating hole 21c, and the second trigger 207 can rotate around the rotating shaft. When the second trigger 207 is in the locked state, the clamping portion 21b is clamped with the support frame 22, and the abutting portion 21a abuts against the first trigger 205. When the second trigger 207 is in the released state, the clamping portion 21b is disengaged from the support frame 22, and the abutting portion 21a is disengaged from the first trigger 205. Similarly, the trigger mechanism 20a further includes a second trigger link 212 which is slidably disposed in the support frame 22 and is rotatably connected to the second trigger 207. And the first microswitch 206, the second microswitch 208 and the main board 28 are all mounted in the support frame 22.

[0046] The cam 201 includes a protruding portion. When the cam 201 rotates to the second position, the protruding portion can abut against the second microswitch 208 and trigger the second microswitch 208.

[0047] Specifically, the transmission mechanism 20b includes a lever 202 and a firing link 203 which is rotatably connected to the lever 202. The motor 20c is fixed in the support frame 22 by screws (not shown in the figure). The output shaft of the motor 20c is fixedly connected to the cam 201. A support bushing 209 is also sleeved on the cam 201. The support bushing 209 is coaxially disposed with the output shaft of the motor 20c and is fixed in the support frame 22. The lever 202 is generally triangular and is fixed to the first support frame 22a by a first pin 27. The lever 202 can rotate around the first pin 27 and the bottom of the lever 202 is engaged with the cam 201. One end of the firing link 203 is rotatably connected to the top of the lever 202, and the other end is connected to the first connecting rod 30a by a second pin 26. The cam 201 includes a transmission portion integrally formed with the protruding portion. The output shaft of the motor 20c is fixedly connected to the cam 201. The lever 202 is rotatably disposed on the support frame 22. The lever 202 abuts against the transmission portion of the cam 201. During the process of the cam 201 rotating from the first position to the second position, the transmission portion pushes the lever 202 to rotate, and the firing link 203 is fixedly connected to the first connecting rod 30a.

[0048] The gun body assembly 2 further includes a main board 28 and an indicating area 23. The indicating area 23 includes an indicating window 23a and an indicating needle 23b arranged in the indicating window 23a. The indicating window 23a is fixedly connected to the housing 24, and the indicating needle 23b is rotatably connected to the support frame 22. The stapler body 1 further includes a paddle 24. The paddle 24 is sleeved on the screw rod 10 and fixedly connected to the screw rod 10. One end of the spring 12 abuts against the adjusting nut 11, and the other end abuts against the paddle 24 and presses the paddle 24 against the adjusting block 14. The front end of the paddle 24 is engaged with the indicating needle 23b. When the paddle 24 moves, it can drive the indicating needle 23b to rotate. The main board 28 is electrically connected to an indicator light 28a, and the indicator light 28a is arranged below the indicating window 23a.

[0049] Meanwhile, the main board 28 is electrically connected to the motor 20c, and both the first microswitch 206 and the second microswitch 208 are electrically connected to the main board 28.

[0050] The barrel assembly 3 includes a first connecting rod 30a, a first short connecting rod 30b, a second connecting rod 31 and a tube body 32. The first connecting rod 30a and the first short connecting rod 30b are arranged inside the tube body 32. Meanwhile, the first connecting rod 30a and the first short connecting rod 30b are matched and hollow. The second connecting rod 31 is arranged between the first connecting rod 30a and the first short connecting rod 30b, and one end of the screw rod 10 is fixedly connected to the second connecting rod 31. In addition, the second connecting rod 31 is composed of two identical metal connecting rods 31a stacked together, which increases the strength of the second connecting rod 31 without affecting its elasticity. Preferably, the tube body 32 is made of medical aluminum alloy.

[0051] The needle assembly 4 includes a puncture shaft 41. One end of the second connecting rod 31 is fixedly connected to the puncture shaft 41, and the other end is fixedly connected to the stapler body 1. Specifically, the needle assembly 4 includes a cartridge 40, a puncture head 42, a retaining spring piece 46, and an anvil 43. The puncture shaft 41 is inserted into the cartridge 40. One end of the puncture shaft 41 is inserted between the first connecting rod 30a and the first connecting short rod 30b, and the puncture shaft 41 is connected to one end of the second connecting rod 31 by a pin (not shown in the figure). The other end of the second connecting rod 31 is fixedly connected to the screw 10. A number of titanium staples 47 are loaded in the cartridge 40, and the cartridge 40 is fitted with the first connecting rod 30a. When the first connecting rod 30a moves forward, the titanium staples 47 can be pushed out. The two retaining spring pieces 46 pass through the anvil 43 and the cartridge 40 in sequence, and the anvil 43 is detachably connected to the puncture head 42. When the titanium staples 47 are pushed out, they are blocked by the anvil 43 and thus bent to complete the suture. In addition, a blade gasket 44 is provided between the anvil 43 and the cartridge 40. A cap 45 is snap-fitted on the anvil 43, and a cartridge sleeve 48 is sleeved outside the cartridge 40. Preferably, the cartridge sleeve 48 is made of medical aluminum alloy. When not in use, a protective cover 60 is provided between the anvil 43 and the cartridge 40, and a protective sleeve 61 is provided on the puncture head 42. The puncture head 42 can be selectively used.

[0052] The using process is as follows: Before the operation, first remove the anvil 43, remove the protective sleeve 61 and the protective cover 60, and insert the puncture head 42 on the puncture shaft 41. During the operation, insert the head of the anvil 43 of the stapler into the digestive tract tubular tissue of the human body through a side incision near one end of the digestive tract tubular tissue to be sutured and extend it out from this end, and at the same time insert the cartridge 40 into the other end, and tie a purse string at the two ends.

[0053] Then, rotate the adjusting nut 11 to extend the puncture head 42 and align it with the tail of the anvil 43 and insert it, so that the puncture shaft 41 is inserted into the tail of the anvil 43. Then rotate the adjusting nut 11 until the indicating needle 23b points to the suture position of the indicating window 23a. At this time, the anvil 43 and the cartridge 40 clamp the two parts of human tissue tightly. Pull the second trigger 207 so that the second trigger 207 no longer abuts against the first trigger 205. Then press the first trigger 205. At this time, the motor 20c starts to push out the titanium staples 47. When the suture is completed, the circular knife (not shown in the figure) in the cartridge 40 cuts off the redundant tissue. At this time, the cam 201 triggers the second microswitch 208 to stop the motor 20c from rotating. Take out the stapler and suture the external wound.

[0054] The above embodiments only illustrate several implementation manners of the present utility model, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation to the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. An electric tubular stapler, characterized in that, Comprising: A stapler body (1); A barrel assembly (3), one end of the stapler body (1) is matingly connected to the barrel assembly (3), and the barrel assembly (3) includes a first connecting rod (30a); A head assembly (4), the head assembly (4) is connected to the other end of the barrel assembly (3); A body assembly (2), the body assembly (2) includes a support frame (22) sleeved on the stapler body (1), a firing device (20) and a battery assembly (21) arranged on the support frame (22), the battery assembly (21) is used to supply power to the firing device (20), and the first connecting rod (30a) pushes out the titanium staples (47) in the head assembly (4) for suturing under the drive of the firing device (20); The firing device (20) includes a trigger mechanism (20a), a transmission mechanism (20b) and a motor (20c), the motor (20c) is matingly connected to the transmission mechanism (20b), the first connecting rod (30a) is fixedly connected to the transmission mechanism (20b), and the motor (20c) is used to drive the first connecting rod (30a); The trigger mechanism (20a) includes a first trigger (205), a first microswitch (206), a second microswitch (208) and a main board (28), the transmission mechanism (20b) includes a cam (201), the battery assembly (21) is electrically connected to the main board (28), the first microswitch (206) and the second microswitch (208) are both electrically connected to the main board (28), and the main board (28) is electrically connected to the motor (20c); The first trigger (205) is rotatably arranged on the support frame (22), the first trigger (205) can rotate from a first position to a second position, and when the first trigger (205) rotates to the second position, it can trigger the first microswitch (206) to make the main board (28) control the motor (20c) to start; The cam (201) can rotate from a first position to a second position under the drive of the motor (20c), and when the cam (201) rotates to the second position, it can trigger the second microswitch (208) to make the main board (28) control the motor (20c) to stop.

2. The electric tubular stapler according to claim 1, characterized in that, The cam (201) includes a protrusion, and when the cam (201) rotates to the second position, the protrusion can abut against the second microswitch (208) and trigger the second microswitch (208).

3. The electric tubular stapler according to claim 1, characterized in that, The transmission mechanism (20b) includes a lever (202) and a firing link (203) rotatably connected to the lever (202). The cam (201) includes a transmission portion integrally formed with a protruding portion. The output shaft of the motor (20c) is fixedly connected to the cam (201). The lever (202) is rotatably disposed on the support frame (22). The lever (202) abuts against the transmission portion of the cam (201). During the process of the cam (201) rotating from a first position to a second position, the transmission portion pushes the lever (202) to rotate. The firing link (203) is fixedly connected to the first connecting rod (30a).

4. The electric tubular stapler according to claim 1, wherein The first trigger (205) is integrally formed and includes a pressing portion and a triggering portion. The pressing portion is exposed outside the gun body assembly (2). By pressing the pressing portion, the user can drive the first trigger (205) to rotate and drive the triggering portion to abut against the first microswitch (206) and trigger the first microswitch (206).

5. The electric tubular stapler according to claim 4, characterized in that, The trigger mechanism (20a) includes a second trigger (207). The second trigger (207) is rotatably mounted on the support frame (22) and partially exposed outside the gun body assembly (2). The second trigger (207) is used to limit the first trigger (205).

6. The electric tubular stapler according to claim 5, wherein The second trigger (207) includes an abutting portion (21a), a clamping portion (21b), and a rotating hole (21c). The support frame (22) protrudes with a rotating shaft passing through the rotating hole (21c). The second trigger (207) can rotate around the rotating shaft; When the second trigger (207) is in a locked state, the clamping portion (21b) is clamped with the support frame (22), and the abutting portion (21a) abuts against the first trigger (205); When the second trigger (207) is in a released state, the clamping portion (21b) is disengaged from the clamping with the support frame (22), and the abutting portion (21a) is disengaged from the abutment with the first trigger (205).

7. The electric tubular stapler according to claim 1, wherein The first microswitch (206), the second microswitch (208), and the main board (28) are all installed inside the support frame (22).

8. The electric tubular stapler according to claim 1, wherein, The gun head assembly (4) further includes a puncture shaft (41). The barrel assembly (3) further includes a second connecting rod (31). One end of the second connecting rod (31) is fixedly connected to the puncture shaft (41), and the other end is fixedly connected to the stapler body (1).

9. The electric tubular stapler according to claim 8, wherein The stapler body (1) includes a screw (10) and an adjusting nut (11). One end of the screw (10) is fixedly connected to the second connecting rod (31), and the other end is rotatably connected to the adjusting nut (11).

10. The electric tubular stapler according to claim 9, wherein, The gun body assembly (2) further includes an indication area (23) and a paddle (24). The indication area (23) includes an indication window (23a) and an indicating needle (23b) disposed within the indication window (23a). The indication window (23a) is fixedly connected to the support frame (22), and the indicating needle (23b) is rotatably connected to the support frame (22). The paddle (24) is fixedly connected to the screw rod (10), the front end of the paddle (24) is matingly connected to the indicating needle (23b), and when the paddle (24) moves, it can drive the indicating needle (23b) to rotate.

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