CN219207120U - Reduction device and surgical instrument - Google Patents

Abstract

The application provides a reduction device and surgical instrument, the reduction device includes: a transmission member that is driven to move in an axial direction of the transmission member; an electric mechanism configured to provide power for axial movement of the transmission member; a transmission mechanism, in a first state, the transmission mechanism connects the electric mechanism and the transmission member, and in a second state, the transmission mechanism is separated from the electric mechanism; a first operating mechanism configured to be operable to drive the transmission mechanism from a first state into a second state; and a second operating mechanism configured to be operable to drive the transmission member to move in an axial direction of the transmission member when the transmission mechanism is in the second state. The transmission mechanism and the electric mechanism can be separated through the first operation mechanism, and the transmission part can be driven to move through the second operation mechanism so as to return.

Description

Reduction device and surgical instrument

Technical Field

The application relates to the technical field of medical instruments, in particular to a resetting device and a surgical instrument.

Background

In the prior art, some surgical instruments require a surgeon to operate a firing mechanism proximally to drive a drive shaft to move distally and to drive a distal actuator to perform a corresponding surgical procedure. Taking a surgical stapler as an example, the existing surgical stapler comprises a stapler body, a firing handle movably connected with the stapler body and a nail head matched with the stapler body. The stapler body includes a transmission member. In the operation process, the tissue is placed between the nail anvil and the nail bin of the nail head, the distance between the nail anvil and the nail bin is adjusted to gradually clamp the tissue, and then the transmission part is driven to move distally by operating the handle, so that the anastomotic nail is formed on the nail anvil, and the anastomosis of the tissue is completed.

In the use process, doctors often need to apply larger acting force to a firing mechanism (such as a firing handle) to finish the operation, and the operation is very inconvenient to use. Thus, a motor-driven surgical instrument has further emerged. The doctor only needs to start the motor to enable the output shaft of the motor to rotate along a specific direction, and the motor can drive the transmission part to move distally. After the operation is finished, the output shaft of the motor can be rotated in an opposite direction, and the transmission part can be moved proximally to reset the whole instrument. However, when the motor and associated mechanical and electrical components fail, the electrical retraction function may fail, failing to reposition the instrument to open the end effector jaws, rendering the procedure unsmoothly operable.

Disclosure of Invention

An object of the present application is to provide a reduction device and a surgical instrument, in which a transmission mechanism can be separated from an electric mechanism by a first operation mechanism, so that a transmission component is not affected by the electric mechanism, and the transmission component can be driven to move by a second operation mechanism to return.

Embodiments of the present application provide a reduction device for a surgical instrument, the reduction device comprising:

a transmission member that is driven to move in an axial direction of the transmission member;

an electric mechanism configured to provide power for axial movement of the transmission member;

a transmission mechanism that connects the electric mechanism and the transmission member to transmit power of the electric mechanism to the transmission member in a first state, and that is separated from the electric mechanism in a second state;

a first operating mechanism configured to be operable to drive the transmission mechanism from the first state into the second state;

and a second operating mechanism configured to be operable to drive the transmission member to move in an axial direction of the transmission member when the transmission mechanism is in the second state.

In some embodiments, the first operating mechanism is in abutment with the first surface of the transfer mechanism and is operable to move at least partially in a first direction to drive the transfer mechanism to move at least partially in the first direction to bring the transfer mechanism from the first state to the second state.

In some embodiments, the transmission mechanism includes a first gear that is in mesh with the electric mechanism and the transmission member, respectively, when the transmission mechanism is in the first state; when the transmission mechanism is in the second state, the second operation mechanism can be operated to drive the first gear to rotate, so that the first gear drives the transmission part to move along the axial direction of the transmission part.

In some embodiments, the transmission mechanism further includes a first gear shaft penetrating through the first gear, the second operation mechanism is provided with a first mating portion, the first gear shaft is provided with a second mating portion, and the first mating portion and the second mating portion form a connection that is not rotatable relative to each other.

In some embodiments, one of the first mating portion and the second mating portion is a mating concave portion, and the other is a mating convex portion, and an inner surface of the mating concave portion and an outer surface of the mating convex portion are respectively provided with an adaptive rotation stopping structure.

In some embodiments, the first gear shaft is further provided with a limiting portion, and when the first matching portion is connected with the second matching portion, the first matching portion at least partially abuts against the limiting portion.

In some embodiments, the second operating mechanism includes a first operating lever and a second operating lever, the first end of the first operating lever is provided with the first mating portion, and the second end of the first operating lever is rotatably connected to the second operating lever through a first pivot.

In some embodiments, a cavity is provided in the first lever, a chute is provided on one side of the second lever, and the first pivot at least partially enters the chute and is movable along the extending direction of the chute, so that the second lever at least partially enters the cavity of the first lever.

In some embodiments, the first direction is an axial direction along the first gear shaft, and the first direction is perpendicular to an axial direction of the transmission member;

the electric mechanism comprises a motor and a second gear, an output shaft of the motor can drive the second gear to rotate, the output shaft of the motor is parallel to the first direction, and the second gear is at least partially positioned on one side of the first gear along the second direction;

wherein the second direction is opposite to the first direction.

In some embodiments, the first operating mechanism includes a first switch lever and a second switch lever, the first switch lever being coupled to the second switch lever by a second pivot, the second switch lever being driven to move at least partially in the first direction when rotated about the second pivot in a third direction.

In some embodiments, the width of the first switch lever is less than the width of the second switch lever.

In some embodiments, the transmission mechanism further includes a switching mating member, the switching mating member is disposed on one side of the end face of the first gear, and a surface of the switching mating member facing away from the first gear is the first surface.

The embodiment of the application also provides a surgical instrument which comprises the resetting device.

In some embodiments, further comprising a housing, the transmission member and the transmission mechanism being at least partially located in the housing;

the housing includes a receiving cavity, one end of the receiving cavity is opened on one side surface of the housing, and the second operating mechanism can be at least partially placed in the receiving cavity.

The application also provides a surgical instrument comprising the above resetting device.

The resetting device and the surgical instrument provided by the application have the following advantages:

through adopting this application, when needs manual reset transmission part, can make transmission mechanism and electric mechanism separation at first through first operating device to can drive transmission part motion and back reset through the second operating device, even electric mechanism returns the function failure, also can manual drive transmission part and reset. The reduction device may be applied to a surgical stapler or other type of surgical instrument.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings.

FIG. 1 is a schematic diagram of a reset device according to an embodiment of the present application;

FIGS. 2 and 3 are schematic structural views of a reset device according to an embodiment of the present application with a housing removed;

FIG. 4 is a schematic illustration of the cooperation of the transmission mechanism, the transmission member and the first operating mechanism of an embodiment of the present application;

FIG. 5 is a schematic illustration of the engagement of the transmission mechanism, the transmission member and the first lever in accordance with an embodiment of the present application;

FIG. 6 is a schematic illustration of the cooperation of the transmission mechanism, the transmission member, the first lever and the second lever according to an embodiment of the present application;

FIG. 7 is a schematic view of a second lever mechanism according to an embodiment of the present application;

FIG. 8 is a front view of the reset device with the housing removed and the transport mechanism in a first state in accordance with one embodiment of the present application;

FIG. 9 is a front view of the reset device with the housing removed and the transport mechanism in a second state in accordance with one embodiment of the present application;

FIG. 10 is a schematic illustration of the cooperation of a transmission mechanism, a transmission member, and a second operating mechanism according to an embodiment of the present application;

FIG. 11 is a schematic structural view of a second operating mechanism according to an embodiment of the present application;

FIG. 12 is an exploded view of a second operating mechanism according to one embodiment of the present application;

FIG. 13 is a schematic view of a second lever in a storage process according to an embodiment of the present application;

FIG. 14 is a schematic view of a second lever according to an embodiment of the present disclosure when stowed;

fig. 15 is a schematic view of the second operating mechanism according to an embodiment of the present application accommodated in the housing.

Reference numerals:

1. second pivot of housing 33

11. First opening 34 third pivot

13. Second opening 4 transmission mechanism

14. First gear of accommodation chamber 41

2. Second operating mechanism 42 first gear shaft

21. Second matching part of first operation rod 421

211. First engaging portion 422 limiting portion

212. Cavity 43 switching fitting

22. Second operating lever 44 elastic member

221. Chute 5 electric mechanism

23. First pivot 51 motor

3. First operating mechanism 52 second gear

31. First switching lever 6 transmission part

32. Second switch lever 61 tooth surface

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted. "or", "or" in the specification may each mean "and" or ". Although the terms "upper", "lower", "between", etc. may be used in this specification to describe various example features and elements of the present application, these terms are used herein for convenience only, e.g., in terms of the orientation of the examples depicted in the drawings. Nothing in this specification should be construed as requiring a particular three-dimensional orientation of the structure to fall within the scope of this application. Although the terms "first," "second," or "third," etc. may be used herein to describe certain features, these features should be interpreted as merely illustrative and not as limiting the number or importance of the particular features.

The application provides a reduction device for a surgical instrument and a surgical instrument comprising the reduction device. The surgical instrument may be a surgical stapler or other type of instrument. Taking a surgical stapler as an example. The surgical stapler comprises a stapler body and a nail head part positioned at the far end of the stapler body, wherein an electric mechanism, a transmission mechanism and a transmission part are arranged in the stapler body, the nail head part comprises a nail anvil and a nail bin which are oppositely arranged, and a staple is arranged in the nail bin. When the anastomat is triggered, the motor drives the transmission part to move towards the distal side through the transmission mechanism so as to drive the distal nail head to complete the execution actions of cutting and suturing. After the anastomat is completely fired, the transmission part can be driven to move towards the proximal side by the transmission mechanism through the electric mechanism, and the anastomat is reset after being retracted. When the reset function of the electric mechanism fails, the reset device can be operated, the transmission mechanism is separated from the electric mechanism through the first operation mechanism, the transmission part can be driven to move through the second operation mechanism to return and reset, and the manual reset transmission part is realized.

The structure of the reduction device will be described in detail below with reference to the accompanying drawings, taking a surgical instrument as an example of a surgical stapler. It is to be understood that the drawings and the following description are exemplary only and are not intended to limit the scope of the present application.

As shown in fig. 1 to 3, in one embodiment, the reset device includes a housing 1, a transmission member 6, an electric mechanism 5, a transmission mechanism 4, a first operating mechanism 3, and a second operating mechanism 2. The transmission member 6 and the transmission mechanism 4 are at least partially disposed inside the housing 1. The transmission part 6 comprises a transmission shaft extending in the axial direction of the stapler, and the transmission part 6 is provided with tooth surfaces 61 at positions corresponding to the transmission mechanism 4. The transmission member 6 is drivable in an axial movement of the transmission member 6, in particular, the transmission member 6 is drivable in a distal direction of the stapler upon firing of the stapler and the transmission member 6 is drivable in a proximal direction of the stapler upon repositioning of the stapler. The electric machine 5 is configured to provide power for axial movement of the transmission member 6. In this embodiment, the electric mechanism 5 includes a motor 51 and a second gear 52, the second gear 52 being drivable by the motor 51 to rotate about an output shaft of the motor 51. The transmission mechanism 4 includes a first gear 41 and a first gear shaft 42, the first gear shaft 42 is inserted into the first gear 41, and the first gear 41 may rotate around the axis of the first gear shaft 42 along with the first gear shaft 42. The axial direction of the first gear shaft 42 is parallel to a first direction, and the first direction is perpendicular to the axial direction of the transmission member 6. The output shaft of the motor 51 is parallel to the first direction.

In the present application, the distal side and the proximal side are the proximal side with respect to the operator, the side closer to the operator, the side farther from the operator, i.e. the side closer to the surgical site, the distal side, the direction along the axis of the stapler being the axial direction, i.e. the direction from the distal side to the proximal side of the stapler, or the direction from the proximal side to the distal side of the stapler. For example, in the view of fig. 1, the S1 direction is a direction from the distal end side to the proximal end side of the stapler, the S2 direction is a longitudinal direction, i.e., a height direction, hereinafter referred to as a first direction, a direction opposite to the S2 direction, hereinafter referred to as a second direction, and the S3 direction is a lateral direction, i.e., a width direction. In the present application, for one component, the inner side and the outer side are the inner side with respect to the center thereof, and the outer side with respect to the center thereof.

In this embodiment, the transmission mechanism 4 includes a first state (shown in fig. 8) in which the first gear 41 simultaneously engages the tooth surface 61 of the transmission member 6 and the second gear 52 to transmit the power of the motor 51 to the transmission member 6, and a second state (shown in fig. 9). In the second state of the transmission mechanism 4, the first gear 41 is separated from the second gear 52, the first gear 41 remains engaged with the transmission member 6, the movement of the transmission member 6 does not interfere with the motor 51, but the rotation of the first gear 41 still drives the axial movement of the transmission member 6. The structure of the transmission mechanism 4 and the electric mechanism 5 is only an example here, and in other alternative embodiments, the transmission mechanism 4 may comprise a plurality of first gears 41 and/or the electric mechanism 5 may comprise a plurality of second gears 52. When the transmission mechanism 4 enters the second state from the first state, the first gear 41 previously engaged with the second gear 52 is separated from the second gear 52. The output shaft of the motor 51 may be at an angle to the first direction. The first direction may not be perpendicular to the axial direction of the stapler, but may form an angle with the axial direction of the stapler, and, optionally, the angle may be an acute angle.

The first operating mechanism 3 is configured to be operable to drive the transmission mechanism 4 from the first state into the second state. In this embodiment, the second gear 52 is at least partially located on one side of the first gear 41 in the second direction. In a state where the first gear 41 is engaged with the second gear 52, the first operating mechanism 3 is operated so that the first gear 41 is separated from the second gear 52 when the first operating mechanism drives the first gear 41 to move in the first direction.

As shown in fig. 3 to 7, the transmission mechanism 4 further includes a switching mating member 43 located at a lower end surface side of the first gear 41 and an elastic member 44 located at an upper end surface of the first gear 41, and a lower surface of the switching mating member 43 is a first surface of the transmission mechanism 4. The elastic member 44 gives the first gear 41 an elastic biasing force in the second direction. In this embodiment, a limiting portion 422 is disposed at an upper end of the first gear shaft 42, and the elastic member 44 is a compression spring disposed between an upper end surface of the first gear 41 and the limiting portion 422. In other alternative embodiments, the elastic member 44 may be a tension spring provided on the lower end surface side of the first gear 41, a spring piece provided on the upper side or the lower side of the first gear 41, an elastic pad, or the like. When the transmission mechanism 4 is in the second state and the first operating mechanism 3 is no longer operated, the first gear 41 is movable in the second direction by the elastic deformation restoring force of the elastic member 44, so that the transmission mechanism 4 is returned to the first state. The first operating mechanism 3 includes a first switch lever 31 and a second switch lever 32, the first switch lever 31 is connected to the second switch lever 32 through a second pivot 33, the second switch lever 32 drives the first switch lever 31 to move at least partially in the first direction when rotating around the second pivot 33 in a third direction, and the first switch lever 31 drives the first gear 41 to move in the first direction through the switch mating member 43 to be separated from the second gear 52, so that the transmission mechanism 4 enters the second state from the first state. In the view of fig. 3, the third direction is clockwise. As shown in fig. 7, the width of the first switching lever 31 is smaller than the width of the second switching lever 32, and the pressing operation by the user can be facilitated by increasing the width of the second switching lever 32. At least one side of the first switching lever 31 is further provided with a third pivot 34, the inner side of the housing 1 may be correspondingly provided with a circular arc-shaped slide rail, and the third pivot 34 is at least partially embedded in the slide rail. When the second switch lever 32 rotates in a third direction, the third pivot 34 moves in the slide rail, which guides the movement of the first switch lever 31.

The second operating mechanism 2 is configured to be operable to drive the transmission member 6 in an axial movement of the transmission member 6 when the transmission mechanism 4 is in the second state. Specifically, when the transmission mechanism 4 is in the second state, the movement of the transmission mechanism 4 is no longer driven and limited by the motor 51, the second operation mechanism 2 is operable to drive the first gear 41 to rotate, so that the first gear 41 drives the transmission member 6 to move in the axial direction of the transmission member 6, and when the second operation mechanism 2 drives the first gear 41 to rotate in a specific direction, the first gear 41 drives the transmission member 6 to move in the proximal direction, thereby realizing the retraction and restoration of the transmission member 6.

As shown in fig. 3 to 6, in this embodiment, the second operating mechanism 2 includes a first operating lever 21 and a second operating lever 22, the first engaging portion 211 is provided at a first end of the first operating lever 21, and a second end of the first operating lever 21 is rotatably connected to the second operating lever 22 through a first pivot 23. A second engaging portion 421 is provided on a side of the limiting portion 422 of the first gear shaft 42 opposite to the first operating lever 21. The first mating portion 211 and the second mating portion 421 may form a non-rotatable connection. When the second operation lever 22 is operated to rotate the first operation lever 21, the first gear shaft 42 is driven to rotate by the cooperation of the first cooperation portion 211 and the second cooperation portion 421, and the first gear 41 drives the transmission member 6 to move along the axial direction of the stapler.

As shown in fig. 5 and 6, the first mating portion 211 is a mating concave portion, the second mating portion 421 is a mating protrusion, and an inner surface of the mating concave portion and an outer surface of the mating protrusion are respectively provided with an adaptive rotation stopping structure, for example, cross sections of the mating concave portion and the mating convex portion are polygonal. After the first operation lever 21 is combined with the first gear shaft 42, the first end surface of the first operation lever 21 abuts against the upper surface of the limiting portion 422. In another alternative embodiment, the first engaging portion 211 is an engaging convex portion, and the second engaging portion 421 is an engaging concave portion, which is also within the scope of the present application.

The working principle of the resetting device is described in detail below with reference to fig. 8 to 10.

During the firing process of the anastomat, the transmission mechanism 4 is in a first state, and the first gear 41 can transmit the power of the motor 51 to the transmission part 6. When the motor 51 is started, the motor 51 drives the transmission member 6 to move from the initial position to the firing position in the distal direction through the first gear 41. After the firing of the stapler is completed, the state of the resetting device is as shown in fig. 8, when the transmission part 6 has not been reset. At this time, the transmission member 6 is located at the firing position. The transmission mechanism 4 is still in the first state, and the first gear 41 is simultaneously engaged with the tooth surface 61 of the transmission member 6 and the second gear 52. When the transmission member 6 needs to be reset, the second switching lever 32 is first operated to rotate the second switching lever 32 along the third direction, the second switching lever 32 drives the first switching lever 31 to move along the first direction, the first switching lever 31 drives the first gear 41 to move away from the second gear 52 through the switching matching part, the first gear 41 presses the elastic member 44 to elastically deform, and the first gear 41 is separated from the second gear 52, that is, the transmission mechanism 4 is separated from the electric mechanism 5 and enters the second state. The first gear 41 remains engaged with the tooth surface 61 of the transmission member 6. At this time, the state of the reset mechanism is as shown in fig. 9 and 10. Then, the second operating mechanism 2 is attached to the upper end of the first gear shaft 42, the first engaging portion 211 and the second engaging portion 421 are engaged, the second operating lever 22 is operated to rotate in a specific direction (clockwise in fig. 10), the first operating lever 21 drives the first gear 41 to rotate in the specific direction through the first gear shaft 42, and the first gear 41 drives the transmission member 6 to move in the proximal direction to return.

In this embodiment, the second lever 22 may be housed inside the first lever 21, and the second operating mechanism 2 may be housed integrally inside the housing 1, before the manual retraction reset. Specifically, as shown in fig. 11 and 12, a cavity 212 is provided in the first lever 21, a chute 221 is provided on one side of the second lever 22, and the first pivot 23 at least partially enters the chute 221 and is movable along the extending direction of the chute 221. When the second operating mechanism 2 is needed, the second operating lever 22 and the first operating lever 21 are adjusted to be in a substantially vertical state, so that the operation of a user is facilitated. As shown in fig. 13, when the storage is required, the second lever 22 is first adjusted to be substantially parallel to the first lever 21, and then the second lever 22 is pushed into the first lever 21, and the first pivot 23 moves along the chute 221, so that the second lever 22 is at least partially inserted into the cavity 212 of the first lever 21, and the state of fig. 14 is reached. As shown in fig. 15, the housing 1 includes a receiving chamber 14, a second opening 13 at one end of the receiving chamber 14 is provided at a side surface of the housing 1, and the second operating mechanism 2 may be at least partially placed in the receiving chamber 14 through the second opening 13. When the second lever 22 is required to be used for resetting, the second lever 22 is taken out of the accommodating chamber 14, the second lever 22 is taken out of the first lever 21, the angle of the second lever 22 relative to the first lever 21 is adjusted so that the second lever 22 is substantially perpendicular to the first lever 21, and one end of the first lever 21 provided with the first engaging portion 211 is engaged with the first gear shaft 42 inside the housing 1 through the first opening 11 of the housing 1.

The foregoing is a further detailed description of the present application in connection with the specific preferred embodiments, and it is not intended that the practice of the present application be limited to such description. It should be understood that those skilled in the art to which the present application pertains may make several simple deductions or substitutions without departing from the spirit of the present application, and all such deductions or substitutions should be considered to be within the scope of the present application.

Claims (10)

1. A reduction device for a surgical instrument, the reduction device comprising:

a transmission member (6) which is driven to move in the axial direction of the transmission member (6);

-an electric mechanism (5) configured to provide power for axial movement of the transmission member (6);

a transmission mechanism (4), in a first state, the transmission mechanism (4) connects the electric mechanism (5) and the transmission member (6) to transmit power of the electric mechanism (5) to the transmission member (6), and in a second state, the transmission mechanism (4) is separated from the electric mechanism (5);

a first operating mechanism (3) configured to be operable to drive the transmission mechanism (4) from the first state into the second state;

a second operating mechanism (2) configured to be operable to drive the transmission member (6) in an axial movement of the transmission member (6) when the transmission mechanism (4) is in the second state.

2. The reset device of claim 1 wherein:

the first operating mechanism (3) is abutted against the first surface of the transmission mechanism (4) and can be operated to drive the transmission mechanism (4) to move at least partially along the first direction when moving at least partially along the first direction, so that the transmission mechanism (4) enters the second state from the first state.

3. A reset device according to claim 2, characterized in that the transmission mechanism (4) comprises a first gear wheel (41), said first gear wheel (41) being in engagement with the electric mechanism (5) and the transmission member (6), respectively, when the transmission mechanism (4) is in the first state; when the transmission mechanism (4) is in the second state, the second operation mechanism (2) can be operated to drive the first gear (41) to rotate, so that the first gear (41) drives the transmission part (6) to move along the axial direction of the transmission part (6).

4. A resetting device as claimed in claim 3, characterized in that the transmission means (4) further comprise a first gear shaft (42) penetrating the interior of the first gear (41), the second operating means (2) being provided with a first mating portion (211), the first gear shaft (42) being provided with a second mating portion (421), the first mating portion (211) and the second mating portion (421) forming a non-rotatable connection.

5. The resetting device according to claim 4, wherein the first gear shaft (42) is further provided with a limiting portion (422), and the first mating portion (211) is at least partially abutted against the limiting portion (422) when the first mating portion (211) is connected with the second mating portion (421).

6. The resetting device according to claim 4, wherein the second operating mechanism (2) comprises a first operating lever (21) and a second operating lever (22), a first end of the first operating lever (21) being provided with the first mating portion (211), a second end of the first operating lever (21) being rotatably connected to the second operating lever (22) by a first pivot (23);

the inside of first action bars (21) is equipped with cavity (212), one side of second action bars (22) is equipped with spout (221), first pivot (23) are at least partly get into in spout (221), and can follow the extending direction of spout (221) is moved, so that second action bars (22) are at least partly get into in cavity (212) of first action bars (21).

7. The resetting device according to claim 4, wherein the first direction is along an axial direction of the first gear shaft (42), and the first direction is perpendicular to an axial direction of the transmission member (6);

the electric mechanism (5) comprises a motor (51) and a second gear (52), wherein an output shaft of the motor (51) can drive the second gear (52) to rotate, the output shaft of the motor (51) is parallel to the first direction, and the second gear (52) is at least partially positioned on one side of the first gear (41) along the second direction;

wherein the second direction is opposite to the first direction.

8. A reset device as claimed in claim 3, characterized in that the first operating mechanism (3) comprises a first switching lever (31) and a second switching lever (32), the first switching lever (31) being connected to the second switching lever (32) by a second pivot (33), the second switching lever (32) being driven to move at least partly in the first direction when rotated about the second pivot (33) in a third direction;

the width of the first switching lever (31) is smaller than the width of the second switching lever (32).

9. A surgical instrument comprising the reduction device of any one of claims 1 to 8.

10. Surgical instrument according to claim 9, characterized in that it further comprises a housing in which the transmission member (6) and the transmission mechanism (4) are at least partially located;

the housing comprises a receiving cavity, one end of the receiving cavity is opened on one side surface of the housing, and the second operating mechanism (2) can be at least partially placed in the receiving cavity.

Images