KR102629508B1 - Shaft of surgical shaver and surgical shaver including the same - Google Patents

Abstract

The present invention is a shaver shaft fastened to the hand piece of a surgical shaver, comprising a rotating shaft made of a flexible material, a cutting tip fastened to one end of the rotating shaft, an inner tube into which the rotating shaft is inserted and having a bending portion at the end, and An inner tube is inserted, and a surgical shaver shaft is provided including an outer tube that has a straight shape and can move in the longitudinal direction along the inner tube.

Description

Surgical shaver shaft and surgical shaver including the same {SHAFT OF SURGICAL SHAVER AND SURGICAL SHAVER INCLUDING THE SAME}

The present invention relates to a surgical shaver shaft and a surgical shaver including the same, and more particularly, to a bendable and rotatable surgical shaver shaft and a surgical shaver including the same.

In general, endoscopic surgery is performed without making a large incision in the human body, by inserting an endoscope equipped with a camera and surgical tools (e.g., a shaver) through a small hole and examining the patient's affected area through images captured by the endoscope. It is done.

Endoscopic surgery, which started from laparoscopic surgery, has the advantage of having a smaller incision area compared to open surgery, resulting in smaller scars and less bleeding, resulting in a faster recovery time for surgical patients.

Recently, technology has advanced to the point where endoscopic surgery is possible for almost all surgeries that require open surgery, and the application of endoscopic surgery is increasing in other medical fields.

This endoscopic surgery can also be applied to intrauterine fibroid removal surgery, in which case a surgical shaver is used to remove lesional tissue, such as intrauterine fibroids.

Here, the surgical shaver includes a hand piece that provides a handle that the user can hold during surgery, and a shaver shaft that is fastened to the hand piece.

Specifically, a motor is built inside the hand piece, and the shaver shaft is connected to the rotation axis of the motor to receive rotational force from the motor. Additionally, a cutting tip is fastened to one end of the shaver shaft, and the lesion tissue is removed as the cutting tip rotates together with the shaver shaft.

However, because the conventional surgical shaver has a straight shaver shaft, a curved blind spot may occur where the cutting tip does not reach the lesional tissue to be removed. Accordingly, there is a problem that the possibility of excessive normal tissue damage increases in order to reach the lesional tissue with the cutting tip.

Korea Registered Utility Model Publication No. 20-0487712

In order to solve the problems of the prior art as described above, the purpose is to provide a surgical shaver that can accurately and quickly remove lesion tissue by changing the direction of the end of the shaver shaft with a relatively simple structure.

Another object of the present invention is to provide a surgical shaver that can prevent excessive normal tissue damage during surgery by allowing the cutting tip to reach the lesional tissue through the bending portion of the shaver shaft.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

In order to solve the above-described problem, the present invention is a shaver shaft fastened to the hand piece of a surgical shaver, including a rotating shaft made of a flexible material, a cutting tip fastened to one end of the rotating shaft, and the rotating shaft is inserted and provided at the end. A surgical shaver shaft is provided including an inner tube having a bending portion, and an outer tube into which the inner tube is inserted and which has a straight shape and can move in the longitudinal direction along the inner tube.

Here, the bending portion may be exposed to the outside when the outer tube moves toward the other end of the rotating shaft.

Additionally, the bending portion may be inserted into the outer tube and converted into the outer tube shape when the outer tube moves toward one end of the rotating shaft.

Additionally, the inner tube may be made of a shape memory alloy.

Additionally, the rotating shaft may have a portion corresponding to the bending portion made of a flexible material.

In addition, the surgical shaver shaft of the present invention may further include an inner socket connected to one end of the inner tube, and an outer socket connected to one end of the outer tube and fastened to the inner socket. Here, the inner peripheral surface of the outer socket may be fastened to the outer peripheral surface of the inner socket.

Additionally, threads may be formed on the outer peripheral surface of the inner socket and the inner peripheral surface of the outer socket.

Additionally, when the outer socket is rotated in one direction, the outer tube can move in the direction of the other end of the rotating shaft.

Additionally, when the outer socket is rotated in the other direction, the outer tube can move in the direction of one end of the rotating shaft.

In addition, the surgical shaver shaft of the present invention may further include a fastening member provided in the inner socket and fastening the rotating shaft to the rotating shaft of the motor.

Additionally, the rotating shaft may be formed with a fixing hole, and the fastening member may be formed with a floating hole extending in the longitudinal direction.

In addition, the surgical shaver shaft of the present invention may further include a floating pin inserted into the fixing hole and the floating hole, and an elastic portion provided in the inner socket to provide elastic force to the rotating shaft.

Here, the elastic part is restrained by a fastening member, and the moving pin can move within the flow hole by the elastic force of the elastic part.

In addition, the present invention includes a hand piece including a motor that provides a handle and generates rotational force, and a shaver shaft fastened to the hand piece, wherein the shaver shaft is made of a flexible material and is connected to the rotating shaft of the motor. A rotating shaft rotated by the rotational force of the motor, a cutting tip fastened to one end of the rotating shaft, an inner tube that is fastened to the hand piece and has a bending portion at the end into which the rotating shaft is inserted, and the inner tube is inserted and has a straight shape. It provides a surgical shaver including an outer tube that can be moved longitudinally along the inner tube.

Here, the bending portion may be exposed to the outside when the outer tube moves toward the other end of the rotating shaft, and may be inserted into the outer tube and converted into an outer tube shape when the outer tube moves toward one end of the rotating shaft.

According to the present invention, by adopting a bending structure using a shape memory alloy at the end of the shaver shaft, it is possible to change the direction of the end of the shaver shaft with a relatively simple structure, which has the effect of performing accurate and rapid removal of lesion tissue.

In addition, according to the present invention, when a curved blind spot occurs where the cutting tip cannot reach the lesional tissue to be removed, the tip reaches the lesional tissue through the bending part of the shaver shaft, thereby preventing excessive normal tissue damage during surgery. can do.

Additionally, according to the present invention, lesional tissue can be effectively removed by providing flexibility to the cutting tip when removing lesional tissue using the elastic force of the elastic portion.

The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below. will be.

Figure 1 is a combined perspective view of a surgical shaver according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of a surgical shaver according to an embodiment of the present invention.
Figures 3 and 4 are diagrams for explaining a method of combining an outer socket and an inner socket in a surgical shaver according to an embodiment of the present invention.
Figure 5 is a diagram for explaining a method of combining a shaver shaft and a hand piece in a surgical shaver according to an embodiment of the present invention.
Figure 6 is a diagram for explaining the operation of exposing the bending portion to the outside in the surgical shaver according to an embodiment of the present invention.
Figure 7 is a diagram for explaining the operation of inserting the bending portion into the outer tube in the surgical shaver according to an embodiment of the present invention.
Figure 8 is a cross-sectional view of a bending portion exposed to the outside in a surgical shaver according to an embodiment of the present invention.
Figure 9 is a cross-sectional view of a bending portion inserted into the outer tube in the surgical shaver according to an embodiment of the present invention.
Figure 10 is a diagram for explaining the operation of the bending portion exposed to the outside in the surgical shaver according to an embodiment of the present invention.
Figure 11 is a diagram for explaining the operation of the bending portion inserted into the outer tube in the surgical shaver according to an embodiment of the present invention.

In order to fully understand the configuration and effects of the present invention, preferred embodiments of the present invention will be described with reference to the attached drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms and various changes can be made. However, the description of this embodiment is provided to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the present invention of the scope of the invention. In the attached drawings, components are shown enlarged in size for convenience of explanation, and the proportions of each component may be exaggerated or reduced.

Terms such as 'first' and 'second' may be used to describe various components, but the components should not be limited by the above terms. The above terms may be used only for the purpose of distinguishing one component from another. For example, the 'first component' may be named 'the second component' without departing from the scope of the present invention, and similarly, the 'second component' may also be named 'the first component'. You can. Additionally, singular expressions include plural expressions, unless the context clearly dictates otherwise. Unless otherwise defined, terms used in the embodiments of the present invention may be interpreted as meanings commonly known to those skilled in the art.

Figure 1 is a combined perspective view of a surgical shaver according to an embodiment of the present invention, and Figure 2 is an exploded perspective view of a surgical shaver according to an embodiment of the present invention.

As shown in Figures 1 and 2, a surgical shaver according to an embodiment of the present invention may be configured to include a shaver shaft 100 and a hand piece 200.

The hand piece 200 provides a handle that the user can hold during surgery, and may be configured to include a motor for generating rotational force therein and a battery for supplying power to the motor. Additionally, the handle may be provided with a button or switch to drive or stop the motor.

The shaver shaft 100 may be fastened to the hand piece 200 and may receive rotational force from the motor of the hand piece 200.

The shaver shaft 100 includes a rotating shaft 110, a cutting tip 120, an inner tube 140, an outer tube 150, an inner socket 160, an outer socket 170, and a fastening member 135. It can be configured as follows.

The rotation shaft 110 may be made of a flexible material, and may be connected to the rotation shaft 211 of the motor provided in the hand piece 200 and rotated by the rotational force of the motor.

The cutting tip 120 may be fastened to one end of the rotating shaft 110. Here, the cutting tip 120 may be made of a spherical abrasive tool or a spherical blade, and can remove lesional tissue by rotation.

The fastening member 135 is a member for fastening the rotating shaft 110 to the rotating shaft 211 of the motor, and a detailed description thereof will be provided later.

The inner tube 140 has a rotating shaft 110 inserted therein, and may be provided with a bending portion 141 at its end. Here, the inner tube 140 may be made of a shape memory alloy (Nitinol) that is flexible and highly human-friendly, and the bending portion 141 may be formed by bending the end of the inner tube 140 at a certain angle. there is. Accordingly, even if the shape of the bending portion 141 is deformed by an external force, it can be restored to its original shape when the external force is released.

Since the rotation shaft 110 is made of a flexible material, the shape of the rotation shaft 110 inserted into the bending portion 141 may change in response to a change in the shape of the bending portion 141.

Here, the bending portion 141 may be formed in advance at various angles depending on the location of the lesion tissue. That is, the surgical shaver according to an embodiment of the present invention selects and replaces the inner tube 140 that matches the location of the lesion tissue among a plurality of inner tubes 140 each equipped with a bending portion 141 formed at various angles. You can use it.

The inner tube 140 may have a straight shape except for the bending portion 141, and may be formed to have a length corresponding to the rotating shaft 110.

Meanwhile, only the portion of the rotating shaft 110 corresponding to the bending portion 141 may be made of a flexible material. For example, the rotating shaft 110 may be configured to include a flexible portion 111 and a rigid portion 112, and the flexible portion 111 may be fastened to the rigid portion 112.

The outer tube 150, into which the inner tube 140 is inserted, has a straight shape and can move in the longitudinal direction along the inner tube 140. In this way, so that the outer tube 150 can move along the inner tube 140, the length of the outer tube 150 may be shorter than the inner tube 140, and the diameter of the outer tube 150 may be smaller than the inner tube 140. ) can be larger than

The outer tube 150 may be made of an inflexible metal material that is harmless to the human body, but is not limited thereto.

The surgical shaver according to an embodiment of the present invention is provided with a first bearing part 131 between one end of the rotary shaft 110 and one end of the inner tube 140 for smooth rotation of the rotary shaft 110, and rotates. A second bearing portion 132 may be provided between the other end of the shaft 110 and the inner socket 160.

Figures 3 and 4 are diagrams for explaining a method of combining an outer socket and an inner socket in a surgical shaver according to an embodiment of the present invention.

As shown in FIGS. 3 and 4, the inner socket 160 may include a bolt portion 161 and a nut portion 162. Here, the bolt portion 161 and the nut portion 162 may be formed integrally or may be formed separately and then combined.

The bolt portion 161 may be hollow in the longitudinal direction and have threads formed on its outer peripheral surface, and the nut portion 162 may be hollow in its longitudinal direction and have threads formed on its inner peripheral surface.

Here, the inner peripheral surface of the nut portion 162 may be fastened to the bolt portion 210 formed at one end of the hand piece 200. That is, after matching the thread of the nut portion 162 of the inner socket 160 to the thread of the bolt portion 210, the nut portion 162 or the bolt portion 210 is rotated in one direction to hold the inner socket 160 in the hand. It can be fastened to the piece 200.

Additionally, when replacing the shaver shaft 100, the nut portion 162 or the bolt portion 210 may be rotated in another direction to separate the inner socket 160 from the hand piece 200.

The outer socket 170 may be hollow in the longitudinal direction and have threads formed on its inner peripheral surface.

Here, the inner peripheral surface of the outer socket 170 may be fastened to the bolt portion 161 of the inner socket 160. That is, after aligning the thread of the outer socket 170 with the thread of the bolt portion 161 of the inner socket 160, the outer socket 170 is rotated in one direction to connect the outer socket 170 to the bolt of the inner socket 160. It can be fastened to part 161. Accordingly, the cavities of the outer socket 170 and the inner socket 160 communicate with each other.

In a state where the outer socket 170 is fastened to the inner socket 160, the outer tube 150, the inner tube 140, and the rotating shaft 110 may penetrate the hollow of the outer socket 170. Here, the outer tube 150 is fixed to the outer socket 170, and the inner tube 140 and the rotating shaft 110 are not fixed to the outer socket 170.

Additionally, the inner tube 140 and the rotating shaft 110 may penetrate the hollow portion of the bolt portion 161 of the inner socket 160. Here, the inner tube 140 is fixed to the bolt part 161, and the rotating shaft 110 is not fixed to the bolt part 161.

Here, the inner tube 140 is fixed to the bolt portion 161 of the inner socket 160, and the outer tube 150 is fixed to the outer socket 170, so the outer socket 170 is connected to the inner socket ( After fastening to the bolt portion 161 of 160, the outer socket 170 can be rotated in one direction or the other direction to move the outer tube 150 in the longitudinal direction.

The second bearing portion 132 may be hollow and may be provided between the bolt portion 161 and the nut portion 162 of the inner socket 160.

The rotating shaft 110 may penetrate the second bearing portion 132 and the nut portion 162 of the inner socket 160. Here, the fastening member 135 may be accommodated in the hollow of the nut portion 162, and the other end of the rotating shaft 110 may be fastened to the fastening member 150.

The elastic portion 134 penetrates the other end of the rotating shaft 111 and is provided inside the nut portion 162. Here, the elastic portion 134 may be a spring.

The elastic portion 134 may be constrained between the second bearing portion 132 and the fastening member 135 and contracted or relaxed by elastic force.

The fastening member 135 is hollow in the longitudinal direction and has a flow hole 136 penetrating the side. And, a fixing hole is formed at the other end of the rotating shaft 110. Here, the flow hole 136 extends in the longitudinal direction to provide a space in which the flow pin 133 can move, and both ends of the flow hole 136 serve as stoppers to limit the movement of the flow pin 133.

The floating pin 133 is inserted into the floating hole 136 and the fixing hole of the rotating shaft 110 while the other end of the rotating shaft 110 is inserted into the hollow of the fastening member 135.

Here, when the cutting tip 120 contacts the lesion tissue and pressure is applied to the rotating shaft 110, the moving pin 133 can move within the flowing hole 136 due to the elastic force of the elastic portion 134. That is, the pressure applied to the rotating shaft 110 varies depending on the type of lesion tissue contacting the cutting tip 120, and the elastic force of the elastic portion 134 also changes accordingly. Accordingly, the moving pin 133 can move to one side or the other side of the moving hole 136.

As such, the surgical shaver according to an embodiment of the present invention can effectively remove lesional tissue by providing flexibility to the cutting tip 120 when removing lesional tissue using the elastic force of the elastic portion 134.

Figure 5 is a diagram for explaining a method of combining a shaver shaft and a hand piece in a surgical shaver according to an embodiment of the present invention.

Referring to Figure 5 (a), a fastening groove 137 is formed at the end of the fastening member 135. Here, the fastening groove 137 may be formed in a straight or cross shape, but is not limited thereto.

The hand piece 200 is equipped with a motor and a battery that provides driving force to the motor. And, a bolt portion 210 is formed at the end of the hand piece 200. Here, the bolt portion 210 is formed with a hollow communicating with the inside of the hand piece 200, and the rotation axis 211 of the motor is exposed to the outside through the hollow formed in the bolt portion 210.

The end of the rotation shaft 211 of the motor may be formed in a protruding shape corresponding to the shape of the fastening groove 137 of the fastening member 135. For example, if the fastening groove 137 is formed in a straight shape, the end of the rotating shaft 211 may protrude in a straight shape, and if the fastening groove 137 is formed in a cross shape, the end of the rotating shaft 211 may protrude in a cross shape. It can be.

Referring to Figure 5 (b), after the thread of the nut portion 162 of the inner socket 160 is abutted to the thread of the bolt portion 210 of the hand piece 200, the nut portion 162 or the bolt portion 210 The shaver shaft 100 can be fastened to the hand piece 200 by rotating in one direction.

Here, the end of the rotation shaft 211 of the motor is inserted into the fastening groove 137 of the fastening member 135. Accordingly, the rotary shaft 110 can rotate together with the rotary shaft 211 of the motor, thereby providing the rotary force of the motor to the rotary shaft 110.

Figure 6 is a diagram for explaining the operation of exposing the bending part to the outside in the surgical shaver according to an embodiment of the present invention, and Figure 7 is a diagram for explaining the operation of exposing the bending part to the outside tube in the surgical shaver according to an embodiment of the present invention. This is a drawing to explain the operation of insertion inside. And, Figure 8 is a cross-sectional view of the bending portion exposed to the outside in the surgical shaver according to an embodiment of the present invention, and Figure 9 is a bending portion inserted into the outer tube in the surgical shaver according to an embodiment of the present invention. This is a cross-sectional view of wealth.

Referring to FIGS. 6 and 8 , the bending portion 141 may be exposed to the outside when the outer tube 150 moves in the direction of the hand piece 200, that is, toward the other end of the rotating shaft 140.

Specifically, the outer socket 170 can be rotated in one direction to move the outer tube 150 in the direction of the hand piece 200. Accordingly, the outer tube 150 fastened to the outer socket 170 may also be moved in the direction of the hand piece 200 to expose the bent portion 141 to the outside. Here, the bending portion 141 may be inserted into the outer tube 150 and deformed into a straight shape, and then restored to its original shape when exposed to the outside. Additionally, the rotating shaft 110 inserted into the bending portion 141 may also be bent according to the shape of the bending portion 141.

In this way, the surgical shaver according to an embodiment of the present invention exposes the bending portion 141 to the outside when a curved blind spot occurs where the cutting tip 120 does not reach the lesion tissue to be removed. By allowing the tip 120 to reach the lesioned tissue, excessive normal tissue damage can be prevented during surgery.

Referring to FIGS. 7 and 9, the bending portion 141 can be inserted into the outer tube 150 when the outer tube 150 moves in the direction of the cutting tip 120, that is, in the direction of the rotary shaft 140. there is.

Specifically, the outer socket 170 can be rotated in another direction to move the outer tube 150 in the direction of the cutting tip 120. Accordingly, the outer tube 150 fastened to the outer socket 170 is also moved in the direction of the cutting tip 120 so that the bending portion 141 can be inserted into the outer tube 150. Here, the bending portion 141 may be exposed to the outside and bent, and then be inserted into the outer tube 150 and deformed into a straight shape. Additionally, the rotating shaft 110 inserted into the bending portion 141 may also be transformed into a straight shape depending on the shape of the bending portion 141.

As such, in the surgical shaver according to an embodiment of the present invention, when the cutting tip 120 can reach the lesion tissue to be removed, the bending portion 141 is inserted into the outer tube 150 to cut the cutting tip. (120) can reach the lesion tissue.

Figure 10 is a diagram for explaining the operation of the bending portion exposed to the outside in the surgical shaver according to an embodiment of the present invention, and Figure 11 is a diagram for explaining the operation of the bending portion exposed to the outside in the surgical shaver according to an embodiment of the present invention. This is a drawing to explain the operation of the inserted bending part.

As shown in FIG. 10, when a curved blind spot occurs where the cutting tip 120 does not reach the lesion tissue to be removed, the outer tube 150 is moved in the direction of the hand piece 200 to remove the bending portion ( When the motor is driven with 141) exposed to the outside, the bending portion 141 remains bent at a certain angle, and the rotation shaft 140 connected to the rotation axis of the motor can be rotated by the rotational force of the motor. .

Here, the portion corresponding to the bending portion 141 of the rotating shaft 140 also rotates in a bent state, allowing the cutting tip 120 to reach the lesional tissue in the blind spot, thereby eliminating excessive normal tissue during surgery. Damage can be prevented.

As shown in FIG. 11, when the cutting tip 120 can reach the lesion tissue to be removed, the outer tube 150 is moved in the direction of the cutting tip 120 so that the bending portion 141 is formed on the outer tube ( 150) When the motor is driven while inserted inside, the rotation shaft 140 connected to the rotation axis of the motor may be rotated by the rotational force of the motor.

Here, the part of the rotating shaft 140 corresponding to the bending portion 141 is converted to a vertical shape and rotates in this state, allowing the cutting tip 120 to reach the lesion tissue.

As such, the surgical shaver according to an embodiment of the present invention adopts a bending structure using a shape memory alloy at the end of the shaver shaft 100, so that the direction of the end of the shaver shaft 100 can be changed with a relatively simple structure. , accurate and rapid removal of lesion tissue can be performed.

In the detailed description of the present invention, specific embodiments have been described, but of course, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention is not limited to the described embodiments, but should be defined by the claims described below and equivalents to these claims.

100: Surgical shaver shaft
110: rotating shaft
120: Cutting tip
140: inner tube
150: outer tube
160: inner socket
170: outer socket

Claims (15)

As a shaver shaft fastened to the hand piece of a surgical shaver,
A rotating shaft made of flexible material;
a cutting tip fastened to one end of the rotating shaft;
an inner tube into which the rotating shaft is inserted and having a bending portion at an end;
an outer tube into which the inner tube is inserted and which has a straight shape and is movable in the longitudinal direction along the inner tube;
an inner socket connected to one end of the inner tube; and
It is connected to one end of the outer tube and includes an outer socket fastened to the inner socket,
The outer peripheral surface of the outer socket is fastened to the outer peripheral surface of the inner socket, and threads are formed on the outer peripheral surface of the inner socket and the inner peripheral surface of the outer socket.
Surgical shaver shaft. According to claim 1,
The bending part
When the outer tube moves toward the other end of the rotating shaft, it is exposed to the outside.
Surgical shaver shaft.
According to claim 2,
The bending part
When the outer tube moves toward one end of the rotating shaft, it is inserted into the outer tube and converted into the outer tube shape.
Surgical shaver shaft.
According to claim 1,
The inner tube is
Made of shape memory alloy
Surgical shaver shaft.
According to claim 1,
The rotating shaft is
The part corresponding to the bending part is made of a flexible material.
Surgical shaver shaft.
delete delete delete According to claim 1,
When the outer socket is rotated in one direction, the outer tube moves in the direction of the other end of the rotating shaft.
Surgical shaver shaft. According to clause 9,
When the outer socket is rotated in the other direction, the outer tube moves in the direction of one end of the rotating shaft.
Surgical shaver shaft.
According to claim 1,
A fastening member provided in the inner socket and fastening the rotating shaft to the rotating shaft of the motor.
A surgical shaver shaft further comprising: According to claim 11,
The rotating shaft has a fixing hole formed, and the fastening member has a flow hole extending in the longitudinal direction.
Surgical shaver shaft.
According to claim 12,
A moving pin inserted into the fixing hole and the moving hole; and
An elastic portion provided in the inner socket to provide elastic force to the rotating shaft
A surgical shaver shaft further comprising:
According to claim 13,
The elastic portion is restrained by the fastening member, and the moving pin moves within the flow hole by the elastic force of the elastic portion.
Surgical shaver shaft.
A hand piece that provides a handle and includes a motor that generates rotational force; and
Includes a shaver shaft fastened to the hand piece,
The shaver shaft is
A rotating shaft made of a flexible material, connected to the rotating shaft of the motor, and rotated by the rotating force of the motor;
a cutting tip coupled to one end of the rotating shaft;
an inner tube fastened to the hand piece, into which the rotating shaft is inserted, and having a bending portion at an end;
an outer tube into which the inner tube is inserted and which has a straight shape and is movable in the longitudinal direction along the inner tube;
an inner socket connected to one end of the inner tube; and
It is connected to one end of the outer tube and includes an outer socket fastened to the inner socket,
The outer peripheral surface of the outer socket is fastened to the outer peripheral surface of the inner socket, and threads are formed on the outer peripheral surface of the inner socket and the inner peripheral surface of the outer socket.
Surgical shaver.

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