CN215191993U - Surgical instrument - Google Patents

Abstract

The utility model relates to a surgical operation instrument, include: a handle including a grip portion formed with an accommodating chamber; the motor is arranged in the accommodating cavity, and a motor cap is arranged at the front end of the motor; the control assembly is used for realizing the operation of the motor through the transmission of control signals; the cutter comprises an interface component arranged on the handle, an outer pipe arranged on the interface component and an inner pipe arranged in the outer pipe, wherein the inner pipe is connected with the output end of the motor through the interface component; wherein, the handle is formed with the convex part towards the holding chamber projection, and the convex part is located the front side in holding chamber, and after the holding chamber was placed into to the motor, the motor cap was located between motor and the convex part, and the convex part passes through the fastener with the motor cap to be connected and makes motor and convex part aim at the accuracy, and can realize freely dismantling, be convenient for maintain the maintenance.

Description

Surgical instrument

Technical Field

The utility model relates to a surgical operation instrument, which belongs to the technical field of medical instruments.

Background

At present, the planing tool in the prior art comprises a handle, a motor, a cutter and the like. Wherein, the motor and the handle are generally fixed by threaded connection or threaded glue, the alignment of the motor and the handle is not accurate, and the motor and the handle cannot be disassembled and maintained.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a surgical operation instrument that motor alignment is accurate, can freely dismantle, be convenient for maintain.

In order to achieve the above purpose, the utility model provides a following technical scheme: a surgical instrument, comprising:

a handle including a grip portion formed with an accommodating chamber;

the motor is arranged in the accommodating cavity, and a motor cap is arranged at the front end of the motor;

the control assembly is used for realizing the operation of the motor through the transmission of control signals;

the cutter comprises an interface assembly arranged on the handle, an outer pipe arranged on the interface assembly and an inner pipe arranged in the outer pipe, and the inner pipe is connected with the output end of the motor through the interface assembly;

the handle protrudes towards the accommodating cavity to form a convex part, the convex part is located on the front side of the accommodating cavity, the motor is placed in the accommodating cavity, the motor cap is located between the motor and the convex part, and the convex part is connected with the motor cap through a fastener.

Further, the motor includes an electrode terminal, and the surgical instrument further includes a cable assembly including a cable having a mounting end, an overmold formed outside the cable, and a connector fitted over the cable after the overmold is formed; wherein the connecting piece is provided with a first opening and a second opening which are oppositely arranged; wherein, after the connecting piece is electrically connected with the electrode terminal at the mounting end, the connecting piece moves along the longitudinal direction of the cable and enables the first opening to be mechanically connected with the rear end of the handle, and the rubber coating part is positioned in the second opening.

Further, the cable assembly further comprises a limiting portion located on the outer circumference of the cable, a supporting portion matched with the limiting portion is formed on the connecting piece, the limiting portion is close to the mounting end, and the limiting portion is supported by the supporting portion when the first opening is mechanically connected with the handle so as to limit the separation of the connecting piece and the rubber coating piece.

Further, a sealing element is arranged between the limiting part and the abutting part.

Further, the cable assembly further comprises a fixing piece clamped on the cable, the rubber coating piece coats the fixing piece and the cable, a friction part is formed on the outer circumference of the fixing piece, and the rubber coating piece covers the friction part.

Furthermore, the limiting part is located on the fixing part, the rubber coating part does not cover the limiting part, and the limiting part protrudes out of the rubber coating part in the radial direction of the cable.

Furthermore, the limiting part is provided with a limiting surface, the abutting part is provided with an abutting surface, and the upper end surface of the rubber coating piece and the abutting surface are on the same horizontal line and abut against the limiting surface.

Furthermore, the handle also comprises a butt joint part which is provided with a liquid reflux cavity and is connected with the holding part, a through hole which is used for communicating the inner tube and the liquid reflux cavity is formed on the interface component, and liquid in the human body is sucked into the through hole along the inner tube and is sucked into the liquid reflux cavity through the through hole; the butt joint part is further provided with a water outlet communicated with the liquid reflux cavity, and liquid in the human body is sucked out of the butt joint part through the water outlet.

Further, the surgical instrument further comprises a suction assembly connected with the water outlet, and the suction assembly is used for generating negative pressure so as to suck liquid in the human body out of the handle.

Further, an insulating part is arranged on the inner wall of the liquid backflow cavity.

The beneficial effects of the utility model reside in that: this application passes through the fastener with the front end of motor and is connected with the convex part for the motor aligns the accuracy with the convex part, and can realize freely dismantling, be convenient for maintain the maintenance.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.

Drawings

FIG. 1 is a cross-sectional view of the overall construction of a surgical instrument according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of the surgical instrument illustrated in FIG. 1;

FIG. 3 is a partial schematic structural view of the surgical instrument illustrated in FIG. 1;

FIG. 4 is a partial cross-sectional structural view of the surgical instrument illustrated in FIG. 1;

FIG. 5 is a cross-sectional view of the overall construction of a surgical instrument according to another embodiment of the present invention;

fig. 6 is an enlarged view of a portion of the surgical instrument illustrated in fig. 5.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.

Referring to fig. 1, the surgical instrument 100 of a preferred embodiment of the present invention is a planer tool for planing, cutting, trimming, grinding and the like bone, cartilage and even burr inside the human body, and indeed, in other embodiments, the surgical instrument 100 may be other instruments, such as bone saw, bone hammer, curette and the like. In practice, the working heads with different functions can be replaced according to different needs, and are not particularly limited herein.

Specifically, the surgical instrument 100 includes a handle 1, a motor 2 disposed in the handle 1, a control assembly 3 for driving the motor 2 to operate, and a cutter 4 connected to the handle 1 for performing a work task, where the cutter 4 is the above-mentioned working head. The control assembly 3 is activated to operate the motor 2 to drive the cutter 4 to work for cutting. The control component 3 receives the control signal and operates the motor 2 based on the control signal, so a control panel (not shown) for sending the control signal can be further arranged in the handle 1, and the control component 3 is electrically connected with the control panel. In other embodiments, the control assembly 3 may control the operation of the motor 2 and may also implement the operation of other components, which are determined according to actual situations and are not specifically limited herein. In this embodiment, the control component 3 is a switch electrically connected to the motor 2, and the switch 3 may be a push switch or a push switch; indeed, in other embodiments, the switch 3 may be a switch encapsulated by a long-leg insert, or the like.

In this embodiment, the handle 1 is made of metal, such as stainless steel, etc., but in other embodiments, the handle 1 may also be made of plastic, which is not specifically limited herein, depending on the actual situation. The handle 1 includes a holding portion 11 and an abutting portion 12 connected to the holding portion 11, and the abutting portion 12 is formed by extending forward from the holding portion 11 with the direction of the tool 4 as the front, that is, the abutting portion 12 is provided at the front end of the holding portion 11. An accommodating cavity 111 is formed in the grip 11, and the motor 2 is fixedly accommodated in the accommodating cavity 111. Referring to fig. 2, in the embodiment, the motor 2 is fixedly accommodated in the accommodating cavity 111 through the fastening member 28, so that the motor 2 can be freely assembled and disassembled, maintenance is facilitated, and cost is saved. Specifically, a motor cap 27 is arranged at the front end of the motor 2, a protrusion 1111 is formed by protruding the handle 1 towards the accommodating cavity 111, the protrusion 1111 is integrally formed with the handle 1 and located at the front side of the accommodating cavity 111, after the motor 2 is placed into the accommodating cavity 111, the motor cap 27 is located between the motor 2 and the protrusion 1111, and the protrusion 1111 is connected with the motor cap 27 through a fastener 28. In the process of installing and fixing the motor 2 in the handle 1, the motor cap 27 is connected with the front end of the motor 2, the motor 2 is placed in the accommodating cavity 111 and abuts against the convex portion 1111, at this time, the convex portion 1111 is fixed with the motor cap 27 through the abutting portion 12 without the cutter 4, and in this embodiment, the front end of the motor 2 is in threaded connection with the motor cap 27. In this embodiment, the fastening member 28 is a screw, so that the motor cap 27 and the protrusion 1111 can be more accurately abutted, and the motor 2 can be stably mounted.

Referring to fig. 1, the docking portion 12 is provided with a receiving cavity 121 for receiving a portion of the cutter 4 and a liquid returning cavity 123 disposed at one side of the receiving cavity 121, and at least a portion of the cutter 4 extends into the liquid returning cavity 123 to dock with the motor 2. It is noted that when the motor 2 is disposed in the accommodating cavity 111, a sealing member (not numbered) is disposed around the motor 2, so that the accommodating cavity 111 is not communicated with the liquid-returning cavity 123.

The motor 2 has an output shaft 21, and the surgical instrument 100 further includes a collet 22 mounted on the output shaft 21, the collet 22 holding the rear end of the tool 4. The chuck 22 has a receiving cavity (not numbered) in which an elastic member 23 is disposed, one end of the elastic member 23 is mounted on the output shaft 21, and the other end is mounted with a holding member 24. In the present embodiment, the elastic member 23 is a compression spring, and the purpose of the compression spring 23 is to: when the cutter 4 is inserted into the chuck 22, the abutting piece 24 abuts against the rear end of the cutter 4 and moves towards the direction of the holding part 11 under the action of external force so as to compress the compression spring 23; when the cutter 4 is detached from the handle 1, the external force applied to the pressure spring 23 is removed, and the pressure spring 23 pushes the abutting piece 24 to move towards the direction away from the holding part 11 under the action of the elastic force of the pressure spring 23, so as to push the cutter 4 to move towards the direction away from the holding part 11, and further, the cutter 4 and the handle 1 are rapidly detached.

In this embodiment, the knife 4 is detachably connected to the handle 1, so that the medical staff can clean and sterilize the knife 4 and the liquid reflux cavity 123 conveniently. The cutter 4 and the handle 1 can be detachably clamped. Specifically, the handle 1 is provided with a notch 124, and the cutter 4 is provided with a retainer 413 engaged with the notch 124. Wherein the notch 124 is provided on the docking portion 12 and communicates with the accommodation chamber 121.

The cutter 4 includes an interface component 41 installed on the handle 1, an outer tube 43 installed on the interface component 41, and an inner tube 42 installed in the outer tube 43, wherein the interface component 41 includes a plug 411 inserted into the chuck 22 and a butt joint 412 connected to the handle 1, in this embodiment, the plug 411 is detachably connected to the butt joint 412, and the detachable connection manner is the same as that described above and is not described in detail. When the tool 4 is connected to the handle 1, the plug 411 is plugged into the collet 22, and the catch 413 engages with the notch 124 to fix the butt joint 412 in the accommodating cavity 121.

As described above, the retainer 413 is disposed on the docking head 412. The retaining member 413 and the butt joint 412 may be integrally formed or separately formed, and are not particularly limited, depending on the actual situation. In order to simplify the manufacturing process, in the present embodiment, the retainer 413 is integrally formed with the docking head 412. Meanwhile, the material of the retaining member 413 may be plastic, etc., which may be slightly deformed under the action of external force, so that the retaining member 413 slides along the accommodating cavity 121 to be engaged with the notch 124. Specifically, the docking head 412 includes a docking member (not numbered) and a docking housing (not numbered) sleeved on the docking member, the rear end of the outer tube 43 is fixedly inserted into the front end of the docking member, the front end of the plug 411 is inserted into the rear end of the docking member, the plug 411 and the docking member are detachably connected in a plug-in manner, and the retaining member 413 is disposed on the docking housing.

In this embodiment, the clip 22 holds the rear end of the plug 411, the rear end of the inner tube 42 is fixedly inserted into the plug 411, and the front end of the inner tube 42 extends into the outer tube 43. A gap 45 is formed between the outer tube 43 and the inner tube 42, so that the inner tube 42 moves in the outer tube 43, when the motor 2 operates, the output shaft 21 drives the plug 411 to further drive the inner tube 42 to rotate in the outer tube 43 to achieve the planing operation, and it should be noted that, when the inner tube 42 operates, the outer tube 43 is stationary. Meanwhile, in order to allow the inner tube 42 to run more smoothly in the outer tube 43 and perform the planing operation, the outer tube 43 and the inner tube 42 are disposed in parallel and coaxially. The front ends of the inner tube 42 and the outer tube 43 are provided with cutter head parts 44, wherein the cutter head part 44 of the inner tube 42 is used for cutting work, the cutter head part 44 of the outer tube 43 is used for exposing the cutter head part 44 of the inner tube 42, and the cutter head parts 44 of the inner tube 42 and the outer tube 43 are identical in shape. In the present embodiment, the blade portion 44 has a tooth shape, and the tooth shape is an oblique cut having a tooth shape, so that the blade portion 44 can sharper the bone for planing, grinding, and the like. Indeed, in other embodiments, the tool head 44 may have other shapes, such as a slanted cut, etc., and is not limited thereto.

Referring to fig. 1, when the blade portion 44 is used for shaving and grinding the human body organ, the cleaning liquid is used to clean the blade portion, and in order to deliver the cleaning liquid inside the human body to the outside of the human body, the interface component 41 is provided with a through hole 46 for communicating the inner tube 42 and the liquid return chamber 123. As described above, the rear end of the inner tube 42 is inserted and fixed into the plug 411, and thus the through hole 46 is provided on the plug 411. The holding portion 11 has a water outlet channel 112 formed at one side of the accommodating cavity 111, and the accommodating cavity 111 is not communicated with the water outlet channel 112. In addition, a water valve 122 is further disposed in the docking portion 12, the water valve 122 is disposed between the liquid return cavity 123 and the water outlet channel 112, and the water valve 122 is configured to communicate or close the liquid return cavity 123 and the water outlet channel 112. When the valve is a mechanical valve, the valve is manually turned off, and when the valve is an electronic valve, the valve can be electrically connected with the control assembly 3, so that the control assembly 3 controls the electronic valve to be opened and closed conveniently and quickly. In order to enable the liquid to be smoothly sucked out of the water outlet channel 112, a negative pressure suction device (not shown) for generating negative pressure is connected to one end of the water outlet channel 112, and the negative pressure suction device is of a conventional structure, such as a pressure regulator, a suction pump, and the like, and is not limited herein.

Referring to fig. 3 and 4, the surgical instrument 100 further includes a cable assembly 5 connected to the motor 2, wherein the cable assembly 5 is configured to be electrically connected to an external power source to supply power to the surgical instrument 100. The external power source may be a dc power source or a commercial power source, and is not particularly limited herein, depending on the actual situation. The cable assembly 5 includes a cable 51 having a mounting end 511, a rubber 52 formed outside the cable 51, and a connector 53 fitted over the cable 51 after the rubber 52 is formed. The connecting member 53 has a first opening 531 and a second opening 532 disposed oppositely, specifically, when the connecting member 53 is butted with the handle 1, the first opening 531 is disposed at the end close to the handle 1, and the second opening 532 is disposed at the end far from the handle 1. The motor 2 is provided with the electrode terminal 25, when the rubber coating 52 on the outer side of the cable 51 is formed, the connecting member 53 moves along the longitudinal direction of the cable 51, specifically, moves in the direction away from the handle 1, so as to expose the wiring harness inside the cable 51 to be connected with the electrode terminal 25, when the mounting end 511 of the cable 51 is electrically connected with the electrode terminal 25, the connecting member 53 moves again in the longitudinal direction of the cable 51, specifically, moves in the direction of the handle 1 to be close to one end of the handle 1, and the first opening 531 of the connecting member 53 is mechanically connected with the rear end of the handle 1, at this time, the rubber coating 52 is partially located in the second opening 532. In this embodiment, the mechanical connection is a threaded connection, an external thread for realizing the threaded connection is formed on the first opening 531 of the connecting member 53, and an internal thread matched with the external thread formed on the first opening 531 is provided at the rear end of the handle 1.

In order to prevent the connecting piece 53 sleeved on the rubber-coated piece 52 from being excessively displaced when being connected with the handle 1 to cause the connecting piece 53 to be separated from the rubber-coated piece 52, the cable assembly 5 further comprises a limiting part 54 positioned on the outer circumference of the cable 51, a butting part 533 matched with the limiting part 54 is formed on the connecting piece 53, the limiting part 54 is arranged close to the mounting end 511, and when the first opening 531 is mechanically connected with the handle 1, the limiting part 54 butts against the butting part 533 to limit the connecting piece 53 to be separated from the rubber-coated piece 52. In detail, the limiting portion 54 has a limiting surface 542, the abutting portion 533 has an abutting surface 5331, and the upper end surface 521 of the rubber-covered member 52 and the abutting surface 5331 are on the same horizontal line and abut against the limiting surface 542.

In this embodiment, in order to increase the hardness of the portion of the rubber-covered member 52 and prevent the twisting of the portion of the cable 51 connected between the rubber-covered member 52 and the connecting member 53, the cable assembly 5 further includes a fixing member 56 fixed to the cable 51, the rubber-covered member 52 covers the fixing member 56 and the cable 51, a friction portion 561 is formed on the outer circumference of the fixing member 56, the rubber-covered member 52 covers the friction portion 561, specifically, the friction portion 561 is a recess formed along the inner circumferential surface of the fixing member 56 at the end away from the limiting portion 54, so as to increase the friction between the rubber-covered member 52 and the fixing member 56, and thus the rubber-covered member 52 covered on the fixing member 56 and the cable 51 is firmer. In this embodiment, the fixing member 56 and the position-limiting portion 54 are made of rigid materials.

In this embodiment, the limiting portion 54 is located on the fixing element 56, the rubber-coated member 52 does not cover the limiting portion 54, and the limiting portion 54 protrudes out of the rubber-coated member 52 in the radial direction of the cable 51, so that the limiting portion 54 can better abut against the abutting portion 533 to prevent the connecting element 53 from separating from the limiting portion 54. Indeed, in other embodiments, the position-limiting portion 54 may be formed on the rubber-covered member 52, that is, the position-limiting portion 54 and the rubber-covered member 52 are integrally formed, or the position-limiting portion 54 may be disposed on the outer side of the rubber-covered member 52, but when the connecting member 53 is connected to the handle 1, the problem that the position-limiting portion 54 is separated from the abutting portion 533 may occur, and is not specifically limited herein, depending on the actual situation.

A sealing element 55 is further disposed between the limiting portion 54 and the abutting portion 533, specifically, a groove 541 is recessed in the circumferential surface of the limiting portion 54, and the sealing element 55 is embedded in the groove 541. In this embodiment, the sealing member 55 is a sealing ring disposed along the circumferential surface of the limiting portion 54, and in other embodiments, the sealing member 55 may be disposed otherwise, which is not specifically limited herein.

Referring to fig. 5 and 6, in the present embodiment, the surgical instrument 200 is substantially similar to the surgical instrument 100 in the previous embodiments, except that the handle 1 is made of metal, and in order to reduce the risk of electric shock of the operator, an insulating member (not shown) is disposed on the inner wall of the liquid reflux cavity 123 in the present embodiment, and the holding portion 11 is not disposed with the water outlet channel 112.

Specifically, the method comprises the following steps: when the cutter is electrified (the patient is electrified), the cleaning liquid is made to conduct electricity, in order to prevent the operator from getting an electric shock when using the surgical instrument 200, the inner wall of the liquid reflux cavity 123 is provided with an insulating member, and the butt joint part 12 is further provided with a water outlet 112 communicated with the liquid reflux cavity 123. The purpose of this is to: the insulating member is used to insulate the liquid reflux cavity 123 from the handle 1, and the liquid inside the human body is directly pumped out of the human body through the butt joint part 12 without passing through the holding part 11, so as to reduce or even avoid the risk of electric shock for the operator.

In the present embodiment, the water outlet 112 is opened below the liquid-returning chamber 123 in the height direction of the surgical instrument 200, so that the liquid is sucked out of the docking portion 12. To further facilitate the aspiration of fluid out of the docking portion 12, the surgical instrument 200 further includes an aspiration assembly (not numbered) connected to the water outlet 112. As mentioned above, the pumping assembly may also be electrically connected to the control assembly 3, that is, the control assembly 3 may control the pumping assembly to open or close. The suction assembly is used for generating negative pressure, so that a pressure difference is generated between the inside of the human body and the liquid reflux cavity 123, liquid is sucked into the through hole 46 along the inner tube 42 under the action of the pressure difference and is sucked into the liquid reflux cavity 123 through the through hole 46, and then the liquid in the liquid reflux cavity 123 is sucked out of the butt joint part 12 through the water outlet 112 by the suction assembly.

In order to prevent the liquid from being contaminated around the docking portion 12 when the liquid is sucked out of the docking portion 12, and thus the handle 1 is electrically conductive as a whole, the suction assembly includes a water outlet pipe 113 connected to the water outlet 112, and a negative pressure suction device (not shown) connected to the water outlet pipe 113 and used for generating negative pressure, the negative pressure suction device is of a conventional structure, such as a pressure regulator, a suction pump, etc., and is not limited herein. The water outlet pipe 113 is made of an insulating material, such as insulating plastic, to achieve the purpose of insulation, and to ensure that the operator can avoid the risk of electric shock. The pumping assembly further comprises a pipeline control valve (not shown) disposed on the water outlet pipeline 113, and the opening and closing of the pipeline control valve further controls the on-off of the water outlet pipeline 113, so as to open the water outlet pipeline 113 according to actual requirements. Wherein, this pipeline control valve can be mechanical valve or electronic valve, then artificial manual shutoff when it is mechanical valve, when it is electronic valve, then can with control assembly 3 electric connection, and then make the opening and closing of control assembly 3 control electronic valve, convenient and fast.

In this embodiment, the liquid backflow cavity 123 is provided in the docking portion 12, and the water outlet 112 communicated with the liquid backflow cavity 123 is directly provided on the docking portion 12, so that the liquid inside the human body is directly sucked out of the handle 1 through the water outlet 112, and does not pass through the holding portion 11, so that the holding portion 11 is electrically isolated from the docking portion 12 and the cutter 4, thereby reducing the risk of electric shock of the operator, and being convenient and fast.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A surgical instrument, comprising:

a handle including a grip portion formed with an accommodating chamber;

the motor is arranged in the accommodating cavity, and a motor cap is arranged at the front end of the motor;

the control assembly is used for realizing the operation of the motor through the transmission of control signals;

the cutter comprises an interface assembly arranged on the handle, an outer pipe arranged on the interface assembly and an inner pipe arranged in the outer pipe, and the inner pipe is connected with the output end of the motor through the interface assembly;

the handle protrudes towards the accommodating cavity to form a convex part, the convex part is located on the front side of the accommodating cavity, the motor is placed in the accommodating cavity, the motor cap is located between the motor and the convex part, and the convex part is connected with the motor cap through a fastener.

2. The surgical instrument of claim 1, wherein the motor includes an electrode terminal, the surgical instrument further comprising a cable assembly including a cable having a mounting end, an overmold formed outside the cable, and a connector fitting over the cable after the overmold is formed; wherein the connecting piece is provided with a first opening and a second opening which are oppositely arranged; wherein, after the connecting piece is electrically connected with the electrode terminal at the mounting end, the connecting piece moves along the longitudinal direction of the cable and enables the first opening to be mechanically connected with the rear end of the handle, and the rubber coating part is positioned in the second opening.

3. The surgical instrument of claim 2, wherein the cable assembly further comprises a stop portion located on an outer circumference of the cable, wherein an abutting portion engaged with the stop portion is formed on the connecting member, the stop portion is adjacent to the mounting end, and the stop portion abuts against the abutting portion when the first opening is mechanically connected to the handle to limit the separation of the connecting member from the rubber-covered member.

4. The surgical instrument of claim 3, wherein a seal is disposed between the stop portion and the retaining portion.

5. The surgical instrument of claim 3, wherein the cable assembly further comprises a fixing member clipped to the cable, the sheathing member sheathing the fixing member and the cable, a friction portion formed on an outer circumference of the fixing member, and the sheathing member covering the friction portion.

6. The surgical instrument of claim 5, wherein the stop portion is located on the fixing member, the rubber-covered member does not cover the stop portion, and the stop portion protrudes out of the rubber-covered member in a radial direction of the cable.

7. The surgical instrument of claim 6, wherein the limiting portion has a limiting surface, the abutting portion has an abutting surface, and the upper end surface of the rubber-coated member and the abutting surface are on the same horizontal line and abut against the limiting surface.

8. The surgical instrument of claim 1, wherein the handle further comprises an interface portion defining a fluid return lumen and connected to the grip portion, the interface assembly defining a through-hole for communicating the inner tube with the fluid return lumen, fluid within the body being drawn along the inner tube into the through-hole and through the through-hole into the fluid return lumen; the butt joint part is further provided with a water outlet communicated with the liquid reflux cavity, and liquid in the human body is sucked out of the butt joint part through the water outlet.

9. The surgical instrument of claim 8, further comprising a suction assembly coupled to the water outlet port, the suction assembly configured to generate negative pressure to draw fluid from within the body out of the handle.

10. The surgical instrument of claim 8, wherein insulation is disposed on an inner wall of the fluid-return lumen.

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