CN212261462U

CN212261462U - Novel ultrasonic surgical operation instrument

Info

Publication number: CN212261462U
Application number: CN202020345834.7U
Authority: CN
Inventors: 楼航迪
Original assignee: Dongyuan Minimally Invasive Beijing Medical Technology Co ltd
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2021-01-01
Anticipated expiration: 2030-03-18

Abstract

The utility model relates to the technical field of medical instruments, in particular to a novel ultrasonic surgical instrument, which comprises a tool bit component, a handle component, an energy converter and a connector, wherein the energy converter is arranged on the upper part of the handle component; the cutter head component is positioned at the front part of the device, and a cutter rod is fixedly connected with the transducer; the connector is located the rear portion of device, and ring structure on it passes the transducer, handle components includes right handle shell, left handle shell and side button assembly, side button assembly includes left side button and right side button, the left side button with left side handle shell gomphosis sets up, the right side button with right side handle shell gomphosis sets up, the front end gomphosis of handle is provided with the front end button, and the device has solved among the prior art operating process and has confused the button easily, and the dynamics is great during the operation, easily produces the problem of operation risk, has both improved operation process safety, has also improved operation efficiency.

Description

Novel ultrasonic surgical operation instrument

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a novel ultrasonic surgery surgical instrument.

Background

An ultrasonic scalpel is an ultrasonic soft tissue cutting hemostasis system, and generally comprises a main machine and accessories, wherein the accessories generally comprise a transducer, an ultrasonic knife head (comprising a handle, a waveguide rod, a sleeve and the like) and a foot switch. The main machine provides energy for the energy converter and the cutter head, and the pedal switch and the manual control device on the cutter head are used for controlling the main machine to output energy.

Ultrasonic soft tissue cutting hemostatic systems are used for soft tissue cutting where bleeding control is required and where minimal thermal damage is desired. The current of ultrasonic frequency in the host is conducted to the transducer, the transducer converts the electric energy into mechanical energy of front and back vibration, the tail end of the cutter head vibrates at a certain frequency (such as 55.5kHz) through the transmission and amplification of the cutter head, the heat generated by friction causes the water in the tissue cells contacted with the cutter head to be vaporized, the protein hydrogen bonds are broken, the cells are disintegrated and fused again, and the tissue is cut after being solidified; when the blood vessel is closed, the cutter head is contacted with tissue protein, heat is generated through mechanical vibration, the collagen structure in the tissue is damaged, protein coagulation is caused, the blood vessel is closed, and the purpose of stopping bleeding is achieved.

The development, popularization and application of the ultrasonic scalpel have higher economic and social values. Currently, ultrasonic scalpels have been used in five sense organs surgery, head and neck surgery, breast surgery, thoracic surgery, hepatobiliary surgery, abdominal surgery, minimally invasive urology surgery, and minimally invasive gynecological surgery.

Chinese patent document CN209932901U discloses a handle assembly of an ultrasonic scalpel and an ultrasonic scalpel, in the device, cutting and hemostatic switch buttons are both arranged at the front end of the handle, and a protrusion is designed on the surface of one of the buttons, so that a small-power button and a large-power button can be distinguished in human senses. In actual operation, the buttons with different powers are distinguished by the touch of human fingers, and the risk is caused to the operation due to the fact that wrong buttons are pressed easily.

Chinese patent document CN303090767S discloses a hand piece for surgical instrument, which adopts a lever structure to fix a button on a button support, and the thumb pulls down the button with large force during actual operation. When the doctor is operating, the blood vessel is cliied to keeping silent, and the thumb needs to dial side hemostatic button downwards, and when pressing side hemostatic button with great power, the dynamics that the staff gripped the handle also can fluctuate, because all the other fingers all take on the trigger, the dynamics of jaw department just can be difficult to hold, pinches off the blood vessel easily and produces the maloperation.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the above-mentioned prior art, the utility model discloses a novel ultrasonic surgery surgical instrument, the device set up the front end button through the handle and be the cutting button, and the left and right sides sets up the layout mode that the side button is hemostasis button, has solved among the prior art among the operation process and has confused the button easily, and the dynamics is great during the operation, easily produces the problem of operation risk, has both improved operation process safety, has also improved operation operating efficiency.

The utility model discloses a specific technical scheme as follows: a novel ultrasonic surgical instrument comprises a cutter head component, a handle component, a transducer and a connector, wherein the transducer is arranged on the upper part of the handle component; the cutter head component is positioned at the front part of the device, and a cutter rod is fixedly connected with the transducer; the connector is located at the rear of the device, with a circular ring structure passing through the transducer,

the tool bit assembly comprises a torque wrench and a front rotating wheel, and the front rotating wheel is positioned at the rear end of the tool bit assembly and used for adjusting the direction of the elbow jaw; when the energy converter is screwed down, the torque wrench is sleeved on the outer pipe and acts with the front rotating wheel to prevent the cutter head component from rotating,

the handle assembly comprises a right handle shell, a left handle shell and a side button assembly, the side button assembly comprises a left button and a right button, the left button is embedded with the left handle shell, and the right button is embedded with the right handle shell; the left handle shell and the right handle shell are fixedly embedded into a handle, a front end button is embedded into the front end of the handle, and the front end button can move along the wall thickness direction.

Preferably, the transducer includes first electrode ring, second electrode ring, back runner structure, double-screw bolt, main part and back lid, back runner structure is located the main part middle part, first electrode ring with the second electrode ring is located the rear side of back runner structure, the top of main part is provided with the double-screw bolt structure, the rear portion end of main part is provided with detachable back lid.

Preferably, the connector comprises a first electrode plate, a second electrode plate, a third electrode plate, a fourth electrode plate, a connector shell and a cable, the connector shell wraps the first electrode plate, the second electrode plate, the third electrode plate and the fourth electrode plate, the first electrode plate and the second electrode plate are located at one end of the connector and connected with a circuit board in the handle assembly, and the third electrode plate and the fourth electrode plate are located at the upper part of the connector and connected with the first electrode ring and the second electrode ring in a contact mode; the four electrode pads are electrically connected with the cable in the connector housing.

Preferably, the four electrode plates on the connector are spring ejector pins or special-shaped electrode plates.

Preferably, the left button and the right button are both push buttons.

Preferably, the left handle shell and the right handle shell are pressed and connected fixedly by adopting a plurality of cylinders and a plurality of round holes in an interference fit manner, or the left handle shell and the right handle shell can also be fixedly connected by adopting an ultrasonic welding or gluing manner.

Preferably, the handle assembly further comprises a trigger and a shifting piece, and the shifting piece is fixed in the right handle shell through a rib plate; the trigger is articulated to be fixed on the handle, just be equipped with the bulge on the trigger, the bulge can collide with the plectrum and make a sound, and when will pressing from both sides tight tissue soon, the plectrum is stirred to the arch on the trigger, makes a sound, reminds the doctor to be about to press from both sides tight tissue, improves the operation rate of accuracy.

Preferably, the front rotary wheel is in a hexagonal star shape, an arc-shaped surface is adopted between two adjacent corners, a stepped hole is arranged in the middle of the end surface, and two pairs of flanges are uniformly distributed on the side surface of the hole along the axial direction in the hole with the larger diameter in the stepped hole; the main body part of the torque wrench is of a cylindrical structure with a through hole in the center, one end of the main body part is symmetrically extended outwards along the radial direction of the main body to form a pair of flanges, the other end of the main body part is axially provided with a pair of grooves, and a pair of bulges are extended outwards from the outer surface of the main body part corresponding to the positions of the grooves.

Preferably, the front rotary wheel is in a hexagonal star shape, an arc-shaped surface is adopted between two adjacent corners, a stepped hole is arranged in the middle of the end surface, and two pairs of grooves are uniformly distributed on the side surface of the hole along the axial direction in the hole with the larger diameter in the stepped hole; the main body part of the torque wrench is of a cylindrical structure with a through hole in the center, one end of the main body is symmetrically extended outwards along the radial direction of the main body to form a pair of flanges, the other end of the main body is axially provided with a pair of grooves, and a pair of bulges are respectively extended inwards at positions corresponding to the grooves on the inner surface of the through hole.

The utility model discloses the beneficial effect who has does:

1. the device sets up the front end button through the handle and presses the button for cutting, and the left and right sides sets up the side button and presses the button for stanching, and this kind of overall arrangement design is more reasonable, reduces the operation risk, and the pressing means of side button is for directly pressing, and is more laborsaving, raises the efficiency.

2. The device adopts the double round structure, and the design has back runner structure on the transducer shell, is suitable for the doctor of different finger length, and the suitability is wider, avoids a product not unidimensional handle to appear, reduce cost.

3. The transducer and the cable of the device are separated, the cable cannot be coiled, the resistance is small when the rotating wheel is rotated in the operation, the force is saved, the rotating wheel cannot be wound on the arm, the comfort level is improved, the requirements of ergonomics are met, a doctor is not easy to fatigue, and the operation efficiency is improved.

4. The device is provided with a clamping reminding device, so that misoperation in operation can be prevented, and the operation efficiency is improved.

Drawings

FIG. 1 is an overall external view of a novel ultrasonic surgical instrument of the present invention;

FIG. 2 is an overall exploded view of a novel ultrasonic surgical instrument of the present invention;

FIG. 3 is an internal assembly view of a novel ultrasonic surgical instrument of the present invention;

FIG. 4 is a block diagram of the assembly of the blade assembly of the ultrasonic surgical instrument of the present invention;

FIG. 5 is an assembled view of the handle assembly of the mid-ultrasonic surgical instrument of the present invention;

FIG. 6 is an assembled view of the button assembly on the inside of the handle assembly of the mid-ultrasonic surgical instrument of the present invention;

FIG. 7 is a block diagram of a transducer in the mid-ultrasonic surgical instrument of the present invention;

FIG. 8 is a block diagram of a connector within the ultrasonic surgical device of the present invention;

FIG. 9 is a schematic view of the interior of the right handle shell within the handle assembly of the mid-ultrasonic surgical instrument of the present invention;

FIG. 10 is a schematic view of the interior of the left handle shell in the handle assembly of the mid-ultrasonic surgical instrument of the present invention;

FIG. 11 is an internal block diagram of an assembly view of a left button and left handle shell within the handle assembly of the mid-ultrasonic surgical instrument of the present invention;

FIG. 12 is a schematic view of a torque wrench and a front runner in a head assembly of the mid-ultrasonic surgical instrument of the present invention;

FIG. 13 is another view of the torque wrench and the front wheel of the head assembly of the mid-ultrasonic surgical instrument of the present invention;

the specific meanings of the reference numbers in the drawings:

100-cutter head assembly, 101-elbow jaw, 102-tissue pad, 103-first pin, 104-cutter bar, 105-inner tube, 106-outer tube, 107-torque wrench, 108-second pin, 109-front wheel, 110-first spring support, 111-washer, 112-wave spring, 113-second spring support;

200-handle assembly, 201-right handle shell, 202-third pin, 203-trigger, 204-fourth pin, 205-fifth pin, 206-horizontal pull rod, 207-front button, 208-first switch, 209-left handle shell, 210-circuit board, 211-side button assembly, 212-spring, 213-connecting rod, 214-sixth pin, 215-plectrum, 21101-right button, 21102-second switch, 21103-seventh pin, 21104-third switch, 21105-eighth pin, 21106-left button and 21107-button bracket;

300-transducer, 301-first electrode ring, 302-second electrode ring, 303-rear wheel, 304-stud, 305-body, 306-rear cover;

400-connector, 401-first electrode pad, 402-second electrode pad, 403-third electrode pad, 404-fourth electrode pad, 405-connector housing, 406-cable.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that the embodiments described herein are merely illustrative and explanatory of the present invention, and are not restrictive of the invention.

The article mentions "preceding", "back", "upper", "lower", "left" and "right" all describe standing at operator's angle, and the staff holds the handle, and tool bit one end is the front end, and connector one end is the rear end, and transducer party is the top, and trigger party is the below, and operator's left hand side is the left side, and right hand side is the right side, the position only is for describing simple and conveniently, not be used for the restriction the utility model discloses the handle is held to the hand, and tool bit one end is the front end, and connector one end is the rear end, and the transducer party is the.

As shown in fig. 1 to 11, the technical solution of the disclosed embodiment of the present invention is as follows: a novel ultrasonic surgical instrument comprises a cutter head assembly 100, a handle assembly 200, a transducer 300 and a connector 400, wherein the transducer 300 is arranged on the upper part of the handle assembly 200; the cutter head assembly 100 is positioned at the front part of the device, and the cutter rod 104 is fixedly connected with the transducer 300; the connector 400 is located at the rear of the device with the ring structure passing through the transducer 300.

The cutter head assembly 100 comprises a torque wrench 107 and a front rotating wheel 109, and the front rotating wheel 109 is positioned at the tail end of the cutter head assembly 100 and used for adjusting the direction of an elbow jaw of the cutter head assembly; the torque wrench 107 is used to tighten the transducer 300 to prevent rotation of the cutter head assembly 100 during tightening, and the torque wrench 107 is removed after tightening. The outer tube 106 is threaded through and secured to the front wheel 109 with the hole 10602 aligned with the hole 10901. The inner tube 105 is threaded into the outer tube 106 with the 105 end notch 10502 aligned with the 106 end hole 10602. The tissue pad 102 is embedded in the elbow jaw 101, the bottom bent leg of the elbow jaw 101 extends into the rectangular hole 10501 at one end of the inner tube 105, the hole 10101 of the elbow jaw 101 and the hole 10601 of the outer tube 106 are hinged together through the first pin 103, so that when the inner tube 105 moves axially, the rectangular hole 10501 at the end of the inner tube 105 pulls the bottom bent leg of the elbow jaw 101, the elbow jaw 101 rotates around the first pin 103, and the elbow jaw 101 is opened and closed. The knife bar 104 is inserted into the inner tube 105 with the end hole 10401 aligned with the hole 10901 of the front pulley 109, and the second pin 108 is inserted into the hole 10901 of the

front pulley

109, 108 passing through both the hole 10502 of the inner tube 105 and the hole 10401 of the knife bar 104. The first spring support 110 is sleeved on the inner pipe 105, the gasket 111 is sleeved on the first spring support 110, the wave spring 112 is sequentially sleeved on the first spring support 110, four struts which are circumferentially distributed on the second spring support 113 penetrate into an axial inner hole of the first spring support 110, and protrusions on the four struts extend into a circular hole 10503 which is circumferentially distributed at one end of the inner pipe 105, so that the second spring support 113 is fixed on the inner pipe 105, a threaded structure is arranged on an inner hole at the non-flange end of the first spring support 110, a threaded structure is also arranged at the root part of the second spring support 113 close to the flange end, the threads of the first spring support 110 are screwed on the threads of the second spring support 113, so that the first spring support 110 and the second spring support 113 are fixed at the end part of the inner pipe 105, and the gasket 111 and the wave spring 112 sleeved on the first spring support 110 are movable in the axial direction.

The handle assembly 200 is internally provided with a trigger 203, the trigger 203 is hinged in

holes

20101 and 20901 on the left and right handle shells through a third pin 202, one end of a connecting rod 213 is hinged on the trigger 203 through a sixth pin 214, and the other end is hinged with a fifth pin 205. The horizontal pull rod 206 is provided with a fourth pin 204 and a fifth pin 205 in a penetrating manner, and the pin 204 and the pin 205 extend into the

elongated slots

20102 and 20902 of the handle shell to form a sliding pair, so that the horizontal pull rod 206 can only move along the axial direction of the cutter bar 104. One end of the spring 212 is sleeved on the column at the rear part of the horizontal pull rod 206, and the other end of the spring is contacted with the rib plate 20103 of the right handle shell 201. The front end button 207 is mounted to the handle case through the handle case

upper holes

20104 and 20904, and is movable in the wall thickness direction of the handle case. The first switch 208 is fixed to the rib 20105 of the right handle case 201. The circuit board 210 is fixed to a rib 20106 in the right handle case 201. The side button assembly 211 is secured within the handle shell by

ribs

20107 and 20907 on the left and right handle shells. The paddle 215 is fixed in the right handle shell 201 by a rib 20108, and a protrusion 20301 on the trigger can scrape the paddle 215 to make a sound, so as to remind the doctor that the jaws of the doctor clamp the tissues and can press a button to be electrified. The right button 21101 is hinged to the button bracket 21107 through a seventh pin 21103, and the left button 21106 is hinged to the button bracket 21107 through an eighth pin 21105. The second switch 21102 and the third switch 21104 are secured within a slot of the button bracket 21107. The first switch 208, the second switch 21102, the third switch 21104 and the circuit board 210 are electrically connected. The left handle shell 209 and the right handle shell 201 are held together by interference fit of a plurality of columns 20908 and holes 20109, and may be ultrasonically welded or adhesively attached.

The middle part of the transducer 300 is designed with a rear rotating wheel 303 structure, the first electrode ring 301 and the second electrode ring 302 are embedded in the transducer body 305, the top part is designed with a stud structure 304, and the rear part is designed with a detachable rear cover 306.

The connector housing 405 encloses the first electrode piece 401, the second electrode piece 402, the third electrode piece 403 and the fourth electrode piece 404, the first electrode piece 401 and the second electrode piece 402 are located at one end of the connector and are in contact with the circuit board 210 in the handle housing, and the third electrode piece 403 and the fourth electrode piece 404 are located on the inner surface of the annular structure of the connector and are in contact with the first electrode ring 301 and the second electrode ring 302 of the transducer 300. The four electrode pads are electrically connected with cables 406 within the connector housing 405.

The front wheel 109 on the tool head assembly 100 is hinged to the handle shell by means of the aperture 20110 of the right handle shell 201 and the aperture 20909 of the left handle shell 209. The web 20601 of the horizontal pull rod 206 fits in the gap between the first spring support 110 and the washer 111. The transducer 300 passes through

holes

20111 and 20910 on the left and right handle shells, the stud 304 is in threaded connection with a threaded hole 10402 of the knife bar 104, when screwing, the torque wrench 107 is inserted from the front end of the outer tube 106, the protrusions 10701 on 107 are clamped with the protrusions 10902 on 109, the transducer 300 is screwed by one hand, the torque wrench 107 is gripped by one hand, and after screwing, the torque wrench 107 is taken off. The circular ring on the shell 405 of the connector 400 is sleeved on the cylindrical shell of the transducer, the third electrode plate 403 and the fourth electrode plate 404 are respectively contacted with the first electrode ring 301 and the second electrode ring 302, and the first electrode plate 401 and the second electrode plate 402 are respectively contacted with the circuit board 210 through the

holes

20112 and 20911, so that signal conduction is realized. The four electrode plates are all elastic and constantly keep contact, so that the power-off condition cannot occur, and finally the rear cover 306 is screwed on the main body 305 of the transducer 300 to complete assembly.

During actual operation, a doctor rotates the front rotating wheel 109 according to the position of tissue, the front rotating wheel 109 drives the outer tube 106, the inner tube 105, the knife bar 104, the elbow jaw 101 and the transducer 300 to integrally rotate through the second pin 108, after the position is determined, the trigger 203 is triggered and rotated to drive the connecting rod 213 to move, finally, the horizontal pull rod 206 moves backwards, the tiger mouth 20601 pulls the gasket 111 to backwards compress the wave spring 112, the second spring support 113 is driven to move backwards, the inner tube 105 is pulled to move backwards through the second spring support 113, and the notch 10502 can limit the reciprocating distance of the inner tube 105. Rectangular hole 10501 pulls the bottom hook of elbow jaw 101, makes the jaw closure, and when will pressing from both sides tight tissue soon, protruding 20301 on trigger 203 stirs plectrum 215, makes a sound, reminds the doctor to be about to press from both sides tight tissue, and after pressing from both sides tight tissue, the doctor starts front end button 207 (or side button), begins to amputate (or close) the tissue, cuts off (stanchs) the back, loosen the trigger can, reset under wave spring 112 and spring 212's effect.

In order to facilitate the torque wrench to fix the tool bar to the front wheel, the embodiment provides a structure of the front wheel and the torque wrench, as shown in fig. 12: the front rotating wheel is in a hexagonal star shape, an arc-shaped surface is adopted between two adjacent corners, a stepped hole is arranged in the middle of the end surface, and two pairs of flanges are uniformly distributed on the side surface of the hole along the axial direction in the hole with the larger diameter in the stepped hole; the main body part of the torque wrench is of a cylindrical structure with a through hole in the center, one end of the main body part is symmetrically extended outwards along the radial direction of the main body to form a pair of flanges, the other end of the main body part is axially provided with a pair of grooves, and a pair of bulges are extended outwards from the outer surface of the main body part corresponding to the positions of the grooves.

This embodiment also provides another front wheel and torque wrench configuration, as shown in fig. 13: the front rotating wheel is in a hexagonal star shape, an arc-shaped surface is arranged between two adjacent corners, a stepped hole is arranged in the middle of the end surface, and two pairs of grooves are uniformly distributed on the side surface of the hole along the axial direction in the hole with the larger diameter in the stepped hole; the main body part of the torque wrench is of a cylindrical structure with a through hole in the center, one end of the main body is symmetrically extended outwards along the radial direction of the main body to form a pair of flanges, the other end of the main body is axially provided with a pair of grooves, and a pair of bulges are respectively extended inwards at positions corresponding to the grooves on the inner surface of the through hole.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention is included in the protection scope of the present invention.

Claims

1. A novel ultrasonic surgical instrument comprises a cutter head component, a handle component, a transducer and a connector, wherein the transducer is arranged on the upper part of the handle component; the cutter head component is positioned at the front part of the device, and a cutter rod is fixedly connected with the transducer; said connector being located at the rear of the device with the circular ring structure passing through said transducer, characterized by:

2. The novel ultrasonic surgical instrument of claim 1, wherein: the energy converter includes first electrode ring, second electrode ring, back runner structure, double-screw bolt, main part and back lid, back runner structure is located the main part middle part, first electrode ring with the second electrode ring is located the rear side of back runner structure, the top of main part is provided with the double-screw bolt structure, the rear portion end of main part is provided with detachable back lid.

3. The novel ultrasonic surgical instrument of claim 2, wherein: the connector comprises a first electrode plate, a second electrode plate, a third electrode plate, a fourth electrode plate, a connector shell and a cable, wherein the connector shell wraps the first electrode plate, the second electrode plate, the third electrode plate and the fourth electrode plate, the first electrode plate and the second electrode plate are positioned at one end of the connector and connected with a circuit board in the handle assembly, and the third electrode plate and the fourth electrode plate are positioned at the upper part of the connector and connected with the first electrode ring and the second electrode ring in a contact mode; the four electrode pads are electrically connected with the cable in the connector housing.

4. The novel ultrasonic surgical instrument of claim 3, wherein: the four electrode plates on the connector are spring thimbles or special-shaped electrode plates.

5. The novel ultrasonic surgical instrument of claim 4, wherein: the left side button with the right side button is the push type button.

6. The novel ultrasonic surgical instrument of claim 5, wherein: the left handle shell and the right handle shell are fixedly connected in a pressing mode through a plurality of cylinders and a plurality of round holes in an interference fit mode.

7. The novel ultrasonic surgical instrument of claim 6, wherein: the left handle shell and the right handle shell are fixedly connected in an ultrasonic welding or gluing mode.

8. The novel ultrasonic surgical instrument of claim 7, wherein: the handle assembly further comprises a trigger and a shifting piece, and the shifting piece is fixed in the right handle shell through a rib plate; the trigger is hinged and fixed on the handle, a convex part is arranged on the trigger, and the convex part can collide with the shifting piece and make a sound.

9. The novel ultrasonic surgical instrument of claim 8, wherein: the front rotating wheel is in a hexagonal star shape, an arc-shaped surface is adopted between two adjacent corners, a stepped hole is arranged in the middle of the end surface, and two pairs of flanges are uniformly distributed on the side surface of the hole along the axial direction in the hole with the larger diameter in the stepped hole; the main body part of the torque wrench is of a cylindrical structure with a through hole in the center, one end of the main body part is symmetrically extended outwards along the radial direction of the main body to form a pair of flanges, the other end of the main body part is axially provided with a pair of grooves, and a pair of bulges are extended outwards from the outer surface of the main body part corresponding to the positions of the grooves.

10. The novel ultrasonic surgical instrument of claim 8, wherein: the front rotating wheel is in a hexagonal star shape, an arc-shaped surface is arranged between two adjacent corners, a stepped hole is arranged in the middle of the end surface, and two pairs of grooves are uniformly distributed on the side surface of the hole along the axial direction in the hole with the larger diameter in the stepped hole; the main body part of the torque wrench is of a cylindrical structure with a through hole in the center, one end of the main body is symmetrically extended outwards along the radial direction of the main body to form a pair of flanges, the other end of the main body is axially provided with a pair of grooves, and a pair of bulges are respectively extended inwards at positions corresponding to the grooves on the inner surface of the through hole.