CN220972207U

CN220972207U - Medical torque-adjustable screwdriver

Info

Publication number: CN220972207U
Application number: CN202322557749.3U
Authority: CN
Inventors: 胡华学
Original assignee: Dongguan Jingcheng Medical Equipment Co ltd
Current assignee: Dongguan Jingcheng Medical Equipment Co ltd
Priority date: 2023-09-19
Filing date: 2023-09-19
Publication date: 2024-05-17
Anticipated expiration: 2033-09-19

Abstract

The utility model discloses a medical torque-adjustable screwdriver which comprises a screwdriver rod and a handle, wherein a containing cavity is formed in the handle, a first clamping piece, a second clamping piece and a torque adjusting component are arranged in the containing cavity, the first clamping piece is connected with the handle, the second clamping piece is positioned above the first clamping piece, the second clamping piece can move up and down relative to the first clamping piece, a plurality of arc-shaped bulges and arc-shaped grooves are formed between the first clamping piece and the second clamping piece, the arc-shaped bulges and the arc-shaped grooves are in clamping fit, so that the first clamping piece and the second clamping piece are in clamping connection, the handle can drive the screwdriver rod to rotate, the torque adjusting component comprises a pressure spring, a pressing piece and a driving piece, the upper end and the lower end of the pressure spring are respectively in abutting connection with the pressing piece and the second clamping piece, and the driving piece can drive the pressing piece to move up and down in the containing cavity.

Description

Medical torque-adjustable screwdriver

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a medical torque-adjustable screwdriver.

Background

The torque screwdriver is a special-function screwdriver which is used for locking a screw or a fastener and can automatically slip or dislocate when the screw or the fastener encounters a large torque to possibly damage a fastened part, or can simultaneously give out obvious sounds to remind a user so as to realize safe locking. In the medical field, particularly in the surgical procedure, torque screwdrivers are used for screw locking critical medical components without damaging the medical components, and simultaneously, the screw fasteners can be easily unscrewed to achieve the surgical purpose.

The existing medical torque screwdriver mainly comprises a screwdriver rod, a handle and a torque adjusting component, wherein power is transmitted between the screwdriver rod and the handle by adopting a bevel gear meshing structure, the handle can idle after screwing in place, at the moment, the bevel gears can rotate relatively, but after long-time use, the bevel gears are easy to wear, and the service life of the torque screwdriver is reduced.

Disclosure of utility model

Aiming at the defects in the prior art, the utility model provides a medical torque-adjustable screwdriver which adopts a structure that an arc-shaped protrusion is matched with an arc-shaped groove to transmit power, so that the abrasion between the arc-shaped protrusion and the arc-shaped groove can be reduced, and the service life of the screwdriver can be prolonged.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

The medical torque-adjustable screwdriver comprises a screwdriver rod and a handle, wherein the upper end of the screwdriver rod is inserted into the handle, the screwdriver rod can be connected with the handle in a rotating manner, a containing cavity is formed in the handle, a torque limiting assembly and a torque adjusting assembly are arranged in the containing cavity, the torque limiting assembly comprises a first clamping piece and a second clamping piece, the first clamping piece is connected with the handle, the second clamping piece is located above the first clamping piece, the second clamping piece can move up and down relative to the first clamping piece, the second clamping piece is connected with the screwdriver rod, a plurality of arc-shaped bulges and a plurality of arc-shaped grooves are formed between the first clamping piece and the second clamping piece, the arc-shaped bulges and the arc-shaped grooves are annularly arranged around the outer side of the screwdriver rod in a clamping fit manner, so that the first clamping piece is connected with the second clamping piece in a clamping manner, the handle can drive the screw to rotate, the torque adjusting assembly comprises a pressure spring, an abutting piece and a driving spring, and the upper end of the pressure spring abuts against the lower end of the second clamping piece to enable the pressure spring to be driven to move up and down, and the pressure pressing piece is driven to be abutted against the upper end of the pressure spring or the lower end of the pressure spring respectively; through setting up the limit of being constituted by first joint spare and second joint spare and turning round the subassembly, set up a plurality of arc protruding and a plurality of arc recess between first joint spare and the second joint spare, arc protruding and the cooperation of arc recess joint can make first joint spare and second joint spare joint be connected, and make the handle can drive the screwdriver rod and rotate, constitute moment adjusting part through setting up by compression spring, press fitting piece and driving piece, compression spring is located between press fitting piece and the second joint spare, utilize the driving piece to drive press fitting piece up-and-down movement, make press fitting loosen or compress tightly compression spring, during the use, rotatory handle, make the handle drive first joint spare in proper order, the arc is protruding, the arc recess, the second joint spare screwdriver rod rotates, in the screw in product, after the screw in is in place, the screwdriver rod can't rotate, if continue rotatory handle, the arc protruding can jack-up arc recess makes the second joint spare, the arc protruding breaks away from the arc recess and changes to next arc recess, consequently, adopt arc protruding and arc recess complex structure to transmit power, when handle idle running, the arch can reduce the relative torsion between the arc with both, can be used to improve the wear between the arc and tear down.

As a preferred scheme, first joint spare is first joint platform, the upper surface of first joint platform is located to the arc arch, the arc arch has the convex arc convex surface that makes progress, second joint spare is the second joint platform, the lower surface of second joint platform is located to the arc recess, the arc recess has the convex arc concave surface that makes progress.

As a preferred scheme, first joint spare is first joint platform, the upper surface of first joint platform is located to the arc recess, the arc recess has the arc concave surface of downward bulge, second joint spare is the second joint platform, the lower surface of second joint platform is located to the arc arch, the arc arch has the arc convex surface of downward bulge.

As a preferable scheme, the arc-shaped bulge is a hemispherical bulge.

As a preferable scheme, the driving piece is an adjusting screw, the adjusting screw is rotationally connected with the handle, and the adjusting screw is in threaded connection with the pressing piece.

As a preferable scheme, the pressure resisting part is a pressure resisting ring, a threaded hole is formed in the middle of the pressure resisting ring, a threaded section extending vertically is arranged on the adjusting screw, the threaded section penetrates through the threaded hole, and the threaded section is in threaded connection with the threaded hole.

As a preferable scheme, the upper end of the adjusting screw is provided with a rotating head, the upper end face of the rotating head is provided with an adjusting hole for screwing the adjusting screw, the upper end of the handle is provided with a limiting piece for limiting the adjusting screw to upwards withdraw from the accommodating cavity, the limiting piece is provided with a limiting hole, and the rotating head is rotationally arranged in the limiting hole.

As a preferable scheme, the accommodating cavity penetrates through the upper end face of the handle to form an installation opening, and the limiting piece is fixedly connected with the inner side wall of the installation opening through glue.

As a preferable scheme, the upper surface of the limiting piece is provided with scales, the scales extend along the circumference of the limiting hole, and the upper surface of the rotary head part is provided with marks pointing to the scales.

As a preferable scheme, the outer side wall of the pressing piece is provided with a sliding block, the inner side wall of the accommodating cavity is provided with a sliding groove extending along the up-down direction, the sliding groove penetrates through the upper end face of the handle, and the sliding block is matched with the sliding groove, so that the pressing piece can be arranged in the accommodating cavity in a sliding manner up and down, and the pressing piece is limited to rotate in the accommodating cavity.

Compared with the prior art, the torque limiting device has the obvious advantages and beneficial effects that the torque limiting assembly formed by the first clamping piece and the second clamping piece is arranged, a plurality of arc protrusions and a plurality of arc grooves are arranged between the first clamping piece and the second clamping piece, the arc protrusions and the arc grooves are in clamping fit, the first clamping piece and the second clamping piece can be connected in clamping mode, the handle can drive the screw cutter bar to rotate, the torque adjusting assembly is formed by the pressure spring, the pressing piece and the driving piece, the pressure spring is arranged between the pressing piece and the second clamping piece, the driving piece is used for driving the pressing piece to move up and down, the pressing piece is loosened or pressed to enable the pressure spring to rotate, when the torque limiting device is used, the handle is rotated, the handle sequentially drives the first clamping piece, the arc protrusions, the arc grooves and the second clamping piece to rotate, the screw is screwed into a product, after the screw is screwed into place, if the handle is continuously rotated, the arc protrusions can lift the arc grooves to enable the second clamping piece to move up, the arc protrusions are rotated into the next groove, the arc protrusions are separated from the next groove, the torque limiting device is matched with the arc protrusions, the torque limiting device can rotate along with the arc grooves, and the torque can be more prolonged, and the wear can be reduced when the torque is transmitted between the two arc protrusions and the arc driver is in a sliding mode.

For a clearer description of the structural features, technical means, and specific objects and functions achieved by the present utility model, the present utility model will be further described in detail with reference to the accompanying drawings and specific embodiments:

Drawings

FIG. 1 is a schematic diagram of an assembled structure of an embodiment of the present utility model;

FIG. 2 is an exploded view of an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of an embodiment of the present utility model;

FIG. 4 is a schematic diagram illustrating the connection between the screwdriver rod and the second fastening member according to an embodiment of the present utility model;

FIG. 5 is a schematic view showing the internal structure of the accommodating chamber according to the embodiment of the utility model;

FIG. 6 is a schematic diagram of a stress analysis of an embodiment of the present utility model.

The attached drawings are used for identifying and describing:

10-screwdriver rod 20-handle 21-accommodating cavity

22-Limiting piece 221-limiting hole 23-sliding groove

30-Torque limiting assembly 31-first clamping piece 311-arc-shaped protrusion

32-Second clamping piece 321-arc-shaped groove 322-through hole

40 Moment adjusting component 41-pressure spring 42-pressing piece

421 Threaded bore 43 driver 431 threaded section

432-Swivel head 433-adjustment aperture 434-flange

Detailed Description

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and to simplify the description, and do not indicate or imply that the positions or elements referred to must have specific directions, be configured and operated in specific directions, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood as appropriate by those of ordinary skill in the art.

As shown in fig. 1-6, the utility model discloses a medical torque-adjustable screwdriver, which comprises a screwdriver rod 10 and a handle 20, wherein the upper end of the screwdriver rod 10 is inserted into the handle 20, the screwdriver rod 10 can be connected with the handle 20 in a rotating way, a containing cavity 21 is arranged in the handle 20, a torque limiting assembly 30 and a torque adjusting assembly 40 are arranged in the containing cavity 21, the torque limiting assembly 30 comprises a first clamping piece 31 and a second clamping piece 32, the first clamping piece 31 is fixedly connected with the handle 20, the second clamping piece 32 is positioned above the first clamping piece 31, the second clamping piece 32 can move up and down relative to the first clamping piece 31, the second clamping piece 32 is connected with the screwdriver rod 10, a plurality of arc-shaped bulges 311 and a plurality of arc-shaped grooves 321 are arranged between the first clamping piece 31 and the second clamping piece 32, the arc-shaped grooves 321 surround the outer side of the screwdriver rod 10 in a ring shape, and the arc-shaped bulges 311 and the arc-shaped grooves 321 are matched in a clamping way so that the first clamping piece 31 can drive the second clamping piece 31 to rotate relative to the handle 20.

The moment adjusting assembly 40 includes a pressure spring 41, a pressing member 42, and a driving member 43, where the upper and lower ends of the pressure spring 41 are respectively abutted against the pressing member 42 and the second clamping member 32, and the driving member 43 can drive the pressing member 42 to move up and down in the accommodating cavity 21, so that the pressing member 42 releases or compresses the pressure spring 41.

The first clamping piece 31 is arranged at the bottom of the accommodating cavity 21, a through hole 322 communicated with the accommodating cavity 21 is formed in the first clamping piece 31, the through hole 322 penetrates through the lower end face of the handle 20, and the screwdriver rod 10 can be rotatably arranged in the through hole 322 in a penetrating mode.

In the first embodiment, the first clamping member 31 is a first clamping table, the first clamping table and the handle 20 are integrally formed, the arc-shaped protrusion 311 is arranged on the upper surface of the first clamping table, the arc-shaped protrusion 311 is provided with an arc-shaped convex surface protruding upwards, the second clamping member 32 is a second clamping table, the arc-shaped groove 321 is arranged on the lower surface of the second clamping table, and the arc-shaped groove 321 is provided with an arc-shaped concave surface protruding upwards.

The arc-shaped protrusions 311 are hemispherical protrusions, specifically, the number of the hemispherical protrusions is 2-4, the bottom diameter of the hemispherical protrusions is 1-2 mm, and the height of the hemispherical protrusions is 1-2 mm; by adopting the hemispherical protrusions, when the first clamping member 31 rotates relative to the second clamping member 32, the hemispherical protrusions can be more stably and smoothly alternately embedded into and separated from the arc-shaped grooves 321, and it can be understood that the arc-shaped protrusions 311 can also adopt long arc-shaped protrusions 311, and the long arc-shaped protrusions 311 extend along the radial direction of the screwdriver rod 10.

It should be noted that, in the present utility model, the first clamping table and the handle 20 may be separately disposed.

The driving member 43 is an adjusting screw, the adjusting screw is rotationally connected with the handle 20, the adjusting screw is in threaded connection with the pressing member 42, specifically, the pressing member 42 is a pressing ring, a threaded hole 421 is formed in the middle of the pressing ring, the threaded hole 421 is provided with an inner screw thread, a threaded section 431 extending vertically is formed on the adjusting screw, the threaded section 431 is provided with an outer screw thread, the threaded section 431 is threaded in the threaded hole 421, the threaded section 431 is in threaded connection with the threaded hole 421, during adjustment, the adjusting screw is rotated to enable the pressing member 42 to move up and down along the threaded section 431, so that the pressing member 42 loosens or compresses the pressure spring 41, and the downward pressure of the pressure spring 41 on the second clamping member 32 is adjusted, so that the purpose of adjusting the moment of the screw cutter bar 10 is achieved; it will be appreciated that the utility model may also be used with a threaded section 431 on the abutment ring and a threaded hole 421 on the adjustment screw to the same effect.

The upper end of the adjusting screw is provided with a rotating head 432, the upper end face of the rotating head 432 is provided with an adjusting hole 433 for screwing the adjusting screw, the upper end of the handle 20 is provided with a limiting piece 22 for limiting the adjusting screw to withdraw from the accommodating cavity 21 upwards, the limiting piece 22 is provided with a limiting hole 221, the rotating head 432 is rotatably arranged in the limiting hole 221, specifically, the lower end of the rotating head 432 is provided with a flange 434 extending outwards in a radial direction, the flange 434 is matched with the outer edge of the lower end of the limiting hole 221 so as to limit the adjusting screw to withdraw from the accommodating cavity 21 upwards, and the adjusting hole 433 is a straight hole, a cross hole, a hexagon hole or a plum blossom hole.

The accommodating cavity 21 penetrates through the upper end face of the handle 20 to form an installation opening, and the limiting piece 22 is fixedly connected with the inner side wall of the installation opening through glue.

The upper surface of the limiting piece 22 is provided with scales (not shown), the scales extend along the circumferential direction of the limiting hole 221, the upper surface of the rotating head 432 is flush with the upper surface of the limiting piece 22, the upper surface of the rotating head 432 is provided with marks (not shown) pointing to the scales, and the scale range is 0-60 N.cm; through setting up scale and sign, the size of torsion value can be accurate regulation.

The outer side wall of the pressing member 42 is provided with a sliding block, the inner side wall of the accommodating cavity 21 is provided with a sliding groove 23 extending along the up-down direction, the sliding groove 23 penetrates through the upper end surface of the handle 20, and the sliding block is matched with the sliding groove 23, so that the pressing member 42 can be arranged in the accommodating cavity 21 in a sliding manner up and down, and the pressing member 42 is limited to rotate in the accommodating cavity 21; it will be appreciated that the present utility model may also have the slider disposed on the inner side wall of the accommodating cavity 21, and the chute 23 disposed on the outer side wall of the pressing member 42 may also have the same effect.

The driving member 43 of the present utility model may be replaced by another member having a telescopic function, as long as the driving member 42 can be driven to move up and down.

A force analysis schematic is shown in fig. 6:

1. When not in use, the first clamping piece 31 is subjected to the elastic force F3 vertically downward by the pressure spring 41, and the elastic force F3 pushes the second clamping piece 32 downward, so that the arc-shaped protrusion 311 and the arc-shaped groove 321 are always in clamping fit;

2. When screwing the screw, the handle 20 is rotated clockwise, the handle 20 drives the arc-shaped protrusion 311 to synchronously rotate around the central shaft of the screw cutter bar 10, at this time, the acting force of the arc-shaped protrusion 311 to the arc-shaped groove 321 is F0, the F0 is decomposed into a driving force F1 in the horizontal direction and a jacking force F3 in the vertical direction, as long as the elastic force F3 is greater than the jacking force F2, the second clamping piece 32 cannot overcome the upward movement of the elastic force F3 of the pressure spring 41, the arc-shaped protrusion 311 and the arc-shaped groove 321 always keep a clamping fit state, the first clamping piece 31 is driven by the driving force F1 to drive the screw cutter bar 10 to rotate, and the screw cutter bar 10 rotates the screw into a product, and the following needs to be pointed out: because the screw is provided with the spiral outer screw teeth, when the screw is rotated, the screw can automatically drill into a product through the outer screw teeth without axial pressing of the handle, so that the arc-shaped groove 321 cannot be separated from the arc-shaped protrusion 311 upwards;

3. After the screw is screwed, the screw cannot be screwed continuously, the resistance of the screw can lead the screw arbor 10 to be unable to rotate, if the handle 20 is continuously rotated clockwise, the jacking force F2 is larger than the elastic force F3, then the second clamping piece 32 can overcome the elastic force F3 of the pressure spring 41 to move upwards, the arc-shaped groove 321 is separated from the arc-shaped protrusion 311 upwards, the arc-shaped protrusion 311 is driven by the handle 20 to rotate to the next arc-shaped groove 321, and the handle 20 is sequentially circulated to idle;

4. Moment adjustment, namely rotating the driving piece 43 clockwise, wherein the driving piece 43 drives the pressing piece 42 to move downwards, the pressing piece 42 presses the pressure spring 41 downwards, the elastic force F3 of the pressure spring 41 pressing the second clamping piece 32 downwards is increased, the arc-shaped protrusion 311 and the arc-shaped groove 321 are tightly clamped, the steering force applied to the handle 20 needs to be larger to force the arc-shaped groove 321 to be separated from the arc-shaped protrusion 311 upwards, and the moment of the screwdriver is increased when the elastic force F3 of the pressure spring 41 is increased; conversely, when the driving member 43 is rotated counterclockwise and the pressing member 42 moves upward to release the pressing spring 41, the elastic force F3 decreases, and the moment of the screwdriver decreases.

The second embodiment of the present utility model is different from the first embodiment in that the arc-shaped groove 321 is disposed on the upper surface of the first clamping table, the arc-shaped groove 321 has a concave arc surface protruding downward, the arc-shaped protrusion 311 is disposed on the lower surface of the second clamping table, and the arc-shaped protrusion 311 has a convex arc surface protruding downward.

In summary, according to the torque limiting assembly 30 formed by the first clamping piece 31 and the second clamping piece 32, the plurality of arc protrusions 311 and the plurality of arc grooves 321 are arranged between the first clamping piece 31 and the second clamping piece 32, the arc protrusions 311 and the arc grooves 321 are in clamping fit, so that the first clamping piece 31 and the second clamping piece 32 can be in clamping connection, the handle 20 can drive the screwdriver rod 10 to rotate, the torque limiting assembly 40 is formed by the pressure spring 41, the pressing piece 42 and the driving piece 43, the pressure spring 41 is arranged between the pressing piece 42 and the second clamping piece 32, the driving piece 43 is utilized to drive the pressing piece 42 to move up and down, the pressure spring 41 is loosened or pressed, during use, the handle 20 is rotated, the handle 20 sequentially drives the first clamping piece 31, the arc protrusions 311, the arc grooves 321 and the second clamping piece 32 to rotate, the screwdriver rod 10 is screwed into a product, after the screw is screwed into the product, the screwdriver rod 10 cannot rotate, if the handle 20 is continuously rotated, the arc protrusions 311 can push the second clamping piece 321 to move up the arc protrusions 321, and the arc protrusions 321 are separated from the arc protrusions 321 to rotate along the arc grooves, and the arc grooves 311 can rotate along the arc grooves, and the arc grooves can rotate along the arc grooves can be more in an idle rotation, and the service life is prolonged, and the relative rotation is prolonged, and the rotation of the torque is reduced.

The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, so any modifications, equivalents, improvements, etc. of the above embodiments according to the present utility model are still within the scope of the present utility model.

Claims

1. The utility model provides a medical adjustable moment screwdriver, includes screwdriver rod and handle, in the upper end of screwdriver rod inserts the handle, just screwdriver rod can rotate with the handle and be connected, be equipped with a holding chamber in the handle, be equipped with limit torsion subassembly and moment adjustment assembly, its characterized in that in the holding chamber:

The torque limiting assembly comprises a first clamping piece and a second clamping piece, the first clamping piece is connected with the handle, the second clamping piece is located above the first clamping piece, the second clamping piece can move up and down relative to the first clamping piece, the second clamping piece is connected with the screwdriver rod, a plurality of arc-shaped protrusions and a plurality of arc-shaped grooves are formed between the first clamping piece and the second clamping piece, the arc-shaped grooves surround the outer side of the screwdriver rod in an annular mode, and the arc-shaped protrusions are matched with the arc-shaped grooves in a clamping mode, so that the first clamping piece is connected with the second clamping piece in a clamping mode, and the handle can drive the screwdriver rod to rotate;

the moment adjusting assembly comprises a pressure spring, a pressing piece and a driving piece, wherein the upper end and the lower end of the pressure spring are respectively abutted against the pressing piece and the second clamping piece, and the driving piece can drive the pressing piece to move up and down in the accommodating cavity so that the pressing piece can loosen or compress the pressure spring.

2. The medical torque-adjustable screwdriver of claim 1, wherein the first clamping member is a first clamping table, the arc-shaped protrusion is arranged on the upper surface of the first clamping table, the arc-shaped protrusion is provided with an arc-shaped convex surface protruding upwards, the second clamping member is a second clamping table, the arc-shaped groove is arranged on the lower surface of the second clamping table, and the arc-shaped groove is provided with an arc-shaped concave surface protruding upwards.

3. The medical torque-adjustable screwdriver of claim 1, wherein the first clamping member is a first clamping table, the arc-shaped groove is formed in the upper surface of the first clamping table, the arc-shaped groove is provided with an arc-shaped concave surface protruding downwards, the second clamping member is a second clamping table, the arc-shaped protrusion is formed in the lower surface of the second clamping table, and the arc-shaped protrusion is provided with an arc-shaped convex surface protruding downwards.

4. A medical torque-adjustable screwdriver according to any one of claims 1-3, wherein the arcuate projections are hemispherical projections.

5. The medical torque-adjustable screwdriver according to claim 1, wherein the driving member is an adjusting screw, the adjusting screw is rotatably connected with the handle, and the adjusting screw is in threaded connection with the pressing member.

6. The medical torque-adjustable screwdriver according to claim 5, wherein the pressing member is a pressing ring, a threaded hole is formed in the middle of the pressing ring, a vertically extending threaded section is formed in the adjusting screw, the threaded section penetrates through the threaded hole, and the threaded section is in threaded connection with the threaded hole.

7. The medical torque-adjustable screwdriver according to claim 5, wherein the upper end of the adjusting screw is provided with a rotating head, the upper end face of the rotating head is provided with an adjusting hole for screwing the adjusting screw, the upper end of the handle is provided with a limiting piece for limiting the adjusting screw to exit the accommodating cavity upwards, the limiting piece is provided with a limiting hole, and the rotating head is rotatably arranged in the limiting hole.

8. The medical torque-adjustable screwdriver according to claim 7, wherein the accommodating cavity is formed with an installation opening penetrating through the upper end face of the handle, and the limiting piece is fixedly connected with the inner side wall of the installation opening through glue.

9. The medical torque-adjustable screwdriver according to claim 7, wherein the upper surface of the limiting member is provided with graduations extending in the circumferential direction of the limiting hole, and the upper surface of the rotary head is provided with marks pointing to the graduations.

10. The medical torque-adjustable screwdriver according to claim 1, wherein the outer side wall of the pressing member is provided with a sliding block, the inner side wall of the accommodating cavity is provided with a sliding groove extending in the up-down direction, the sliding groove penetrates through the upper end face of the handle, and the sliding block is matched with the sliding groove, so that the pressing member can be arranged in the accommodating cavity in a up-down sliding manner, and the pressing member is limited to rotate in the accommodating cavity.