WO2023229358A1

WO2023229358A1 - Pneumatic distractor for orthopedic surgery

Info

Publication number: WO2023229358A1
Application number: PCT/KR2023/007046
Authority: WO
Inventors: 이정길; 김상범; 강찬; 이기수; 황정모; 이승후; 송주호
Original assignee: 충남대학교산학협력단; 충남대학교병원
Priority date: 2022-05-24
Filing date: 2023-05-24
Publication date: 2023-11-30
Also published as: KR20230163862A

Abstract

The present invention relates to a pneumatic distractor for orthopedic surgery. The pneumatic distractor can use air pressure to facilitate fixing during distraction and fracture reduction, thus making it easy to perform three-dimensional fracture reduction by rotating a ball joint, and immediately fixing a fracture once the fracture has been reduced.

Description

Pneumatic distractor for orthopedic surgery

The present invention relates to a pneumatic distractor for orthopedic surgery.

A distraction device is an instrument used to reduce bone during orthopedic surgery.

A distraction device is used for reduction during surgery, and quick and accurate fixation is an essential element and is essential.

However, the conventional distraction device is a type in which the device is fixed by combining screws and bolts during surgery, and the fracture reduction is often loosened during this process, and there is a problem in that it is difficult to operate the device itself.

Referring to Figure 1, a conventional smoke generator is shown. In the conventional distraction device as shown in Figure 1, it is difficult to obtain a three-dimensional reduction of the fracture, and after obtaining the reduction, the reduction is often lost during the process of fastening and fixing the screw, making operation difficult.

In addition, in the related art, a distractor that uses pneumatic principles to distract is disclosed. However, these distractors use pneumatic pressure to distract, and there was no awareness of using pneumatic pressure to fix the distractors.

Therefore, in the process of fixation after distraction, there was a problem of difficulty in fixing the device by combining simple screws and bolts, and the problem of the fixation being loosened.

(Patent Document 1) U.S. Patent Publication No. 2021/0106452

(Patent Document 2) Japanese Patent Publication No. 2002-531214

The present invention was created to solve the above problems.

Specifically, the present invention can be said to be essential for effective distraction and temporary fixation of the bone during orthopedic fracture surgery. However, the distractors for orthopedic surgery currently in use have the problem of being difficult to operate, so they use air pressure to distract the bone. This is to make it convenient to operate the smoke.

To this end, the present invention is intended to facilitate fixation by using air pressure when distraction and fracture reduction are achieved.

One embodiment of the present invention for solving the above problems includes a first fixing part (100a) fixed to a part of the bone, and a first fixing part (100a) located spaced apart from the first fixing part (100a) and fixed to another part of the bone. A fixing part 100 including a second fixing part 100b, an extension part 200 coupled to the first fixing part 100a and the second fixing part 100b, and the first fixing part 100a. ) and a gas injection part 300 for injecting gas into the second fixing part 100b, wherein the

fixing parts

100a and 100b include an insertion part 110 that is inserted and fixed into the bone, the insertion part (110) is inserted and an insertion part-body coupling part 120 coupled to the body 130, a hole located on one side of the insertion part-body coupling part 120, and into which the extension part 200 is inserted ( 131) is formed, the first joint 140 connecting the insertion part-body coupling part 120 and the body 130, is located on one side of the hole 131, and the body A second joint 150 combining (130) and the extension part 200, and a pneumatic cylinder 160 whose one side is in communication with the gas injection part 300 and the other side is coupled with the second joint 150. Included, the first joint 140 and the second joint 150 are ball joints, each including balls 141 and 151, and the first joint 140 is the insertion part-body coupling part ( 120) and the body 130 are coupled, and the insertion part-body coupling part 120 is rotatable with respect to the body 130 by rotation of the ball 141, and the second joint 150 is The body 130 and the extension part 200 are combined, and the extension part 200 is rotatable with respect to the body 130 by rotation of the ball 151, and the gas injection part 300 is Gas is injected into one side of the first joint 140 and the pneumatic cylinder 160, and when the gas is injected, the insertion part-body coupling part 120 is fixed to the body 130, and the A distractor is provided in which the extension portion 200 is fixed to the body 130.

In one embodiment, the second joint 150 extends along the inner circumference of the ball 151 and the hole 131 coupled to the extension part 200, and extends along the outer side of the ball 151. It further includes a second joint coupling portion 152 coupled to a cylinder coupling portion 153, one side of which is coupled to the second joint coupling portion 152, and the other side coupled to the pneumatic cylinder 160, When gas is supplied to the pneumatic cylinder 160, the second joint coupling portion 152 and the cylinder coupling portion 153 move toward the ball 151, and the second joint coupling portion 152 and the ball 151 As the ball 151 is in contact with this, the extension part 200 can be fixed to the body 130.

In one embodiment, the first joint 140 is located inside the ball receiving portion 142, which is a space where the ball 141 is located, and the insertion portion-body coupling portion 120, and is located inside the ball receiving portion 142. It further includes a cover part 143 that covers the outside of the ball 142, and the part extending from the ball 141 is coupled to the insertion part-body coupling part 120, and the cover part 143 is configured to cover the gas. It may be in communication with the injection unit 300.

In one embodiment, when gas is supplied to the outside of the ball receiver 142 through the cover part 143, the ball receiver 142 moves toward the ball 141 and the ball receiver 142 ) and the ball 141 are in contact with each other, the insertion part-body coupling part 120 and the body 130 are fixed, and when gas is supplied to the pneumatic cylinder 160, the second joint coupling part 152 While moving toward the ball 151, the second joint engaging portion 152 and the ball 151 may come into contact with each other and the extension portion 200 may be fixed to the body 130.

In one embodiment, two holes 131 are formed in the body 130 and are spaced apart from each other, and the extension portion 200 is a first extension bar coupled to each of the two holes 131. It may include (210) and a second extension bar (220).

In one embodiment, the extension part 200 is a third extension bar 230 inserted into the first fixing part 100a, one end of which is inserted into the second fixing part 100b, and the other end of which is inserted into the second fixing part 100b. It may further include a fourth extension bar 240 coupled to the third extension bar 230 and a screw 250 coupling the third extension bar 230 and the fourth extension bar 240.

In one embodiment, the body 130 includes an upper part 132 and a lower part 133 extending downward from the upper part 132 and having a shorter longitudinal length in the horizontal cross-section than the upper part 132. can do.

In one embodiment, the gas injection unit 300 moves gas from the gas storage unit, and the first gas supply pipe 310 communicates with the first joint 140, and the gas moves from the gas storage unit. and a second gas supply pipe 320 in communication with the pneumatic cylinder 160; and a switch 330 that controls communication between the gas storage unit and the first gas supply pipe 310 and the second gas supply pipe 320. ) may include.

In one embodiment, the switch 330 is a foot switch that rotates the operation pedal by operating it with the foot, and the switch 330 includes the operation pedal and when the operation pedal rotates under pressure, the gas storage Gas may be supplied from the unit to the first gas supply pipe 310 and the second gas supply pipe 320.

According to the present invention, the following effects are achieved.

According to the present invention, when distraction and reduction of a fracture are achieved, fixation can be facilitated using air pressure, making it easy to reduce the fracture in three dimensions by rotating the ball joint, and when reduction is achieved, the distractor is immediately fixed. can do.

Figure 1 is a diagram for explaining a conventional smoke detector.

2 and 3 are diagrams for explaining a distractor according to an embodiment of the present invention.

Figure 4 is a diagram for explaining the first joint.

Figures 5 and 6 are diagrams for explaining the second joint.

7 and 8 are diagrams for explaining a distractor according to another embodiment of the present invention.

In some cases, in order to avoid ambiguity of the concept of the present invention, well-known structures and devices may be omitted or may be shown in block diagram form focusing on the core functions of each structure and device.

Additionally, in describing the embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. The terms described below are terms defined in consideration of functions in the embodiments of the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification.

Hereinafter, “reduction” means returning the anterior and posterior fracture fragments displaced during fracture to their normal positions.

Hereinafter, the direction of "up and down" is set only based on the drawings, and depending on the mode of use, the direction may be reversed or rotated to a different angle, and even if used in this way, it should be understood as being included within the scope of the present invention.

Hereinafter, with reference to FIGS. 1 to 8, a distractor according to the present invention will be described.

The smoke extender according to the present invention includes a fixing part 100, an extension part 200, and a gas injection part 300.

The fixing part 100 includes a first fixing part 100a and a second fixing part 100b.

The first fixing part 100a and the second fixing part 100b include an insertion part 110, an insertion part-body coupling part 120, a first body 130, a first joint 140, and a second joint, respectively. 150 and a pneumatic cylinder 160, and the first fixing part 100a and the second fixing part 100b include the same components.

The first fixing part 100a and the second fixing part 100b are coupled by an extension part 200, which will be described later.

The second fixing part 100b is positioned spaced apart from the first fixing part 100a.

The insertion portion 110 is a part that is inserted into the bone and is inserted into and fixed to the bone.

The insertion portion 110 is not limited to a specific shape as long as it has a shape that can be inserted into and fixed to the bone. For example, the insertion portion 110 is formed to include a sharp portion so that it can be inserted into bone.

Additionally, the insertion portion 110 is coupled to the insertion portion-body coupling portion 120 on one side thereof.

The insertion part-body coupling part 120 has the above-described insertion part 110 inserted into one side. Referring to Figure 2, the insertion part 110 is inserted and positioned below the insertion part-body coupling part 120, but the direction may be reversed or rotated at a different angle depending on the usage mode while using the distractor. .

Additionally, the insertion part-body coupling part 120 is coupled to the body 130 through a first joint 140.

At this time, the part where the insertion part 110 can be formed is coupled to the lower side of the insertion part-body coupling part 120, and the first joint 140 is coupled to the upper side of the insertion part-body coupling part 120. A space that can be created can be formed.

The body 130 is coupled to the insertion part-body coupling part 120 through the first joint 140.

A hole 131 is formed in the body 130 so that an extension part 200, which will be described later, can be inserted.

At this time, the hole 131 is sufficient as long as it can be coupled to the extension portion 200, and is not limited to the size shown. Although it is shown as two, it is not limited to the number shown.

The second joint 150 is located inside the hole 131 in the direction of the body 130, and the second joint coupling portion 152, which will be described later, may be positioned to surround the inner circumference of the hole 131.

Additionally, a separate hole (not shown) may be formed in the body 130 so that the cylinder coupling portion 153 can move toward the ball 151 and in a direction opposite to the ball 151 side according to pneumatic pressure.

The body 130 is shown as a rectangular parallelepiped, but is not limited to that shape.

In another embodiment of the present invention, the body 130 may be formed into a shape that is easy for a user to hold.

Referring to FIG. 7 , the body 130 may include an upper part 132 and a lower part 133 coupled to the first joint 140.

The lower part 133 may be formed to extend from the upper part 132.

The lower part 133 may be formed so that the longitudinal length of the horizontal cross-section is shorter than that of the upper part 132.

The body 130 may be formed so that the user can easily hold it by grasping the upper part 132 and the lower part 133.

Additionally, the upper portion 132 may be formed so that the longitudinal length increases and then decreases.

However, the body 130 is not limited to a specific shape, and any shape that allows the user to easily hold the body 130 is sufficient and is not limited to the drawings and the above description.

The first joint 140 couples the insertion part-body coupling part 120 and the body 130.

The first joint 140 may be formed as a ball joint.

The first joint 140 may be coupled to a space formed inside the insertion part-body coupling part 120.

Referring to FIG. 4, the first joint 140 includes a ball 141, a ball receiving portion 142 that is a space where the ball 141 is located, and a cover portion 143 that covers the ball receiving portion 142. Includes.

The ball 141 can be used to adjust the position of the fixing part 100 while rotating within the ball receiving part 142 to conquer it.

The ball receiving portion 142 is a space where the ball 141 rotates and moves, and is located a predetermined distance away from the ball 141 before gas is supplied.

The cover portion 143 covers the outside of the ball receiving portion 142 and is inserted into the insertion portion-body coupling portion 120.

A first gas supply pipe 310, which will be described later, is connected to one side of the cover part 143, and gas can be supplied to the inner space of the cover part 143 and the outer space of the ball receiving part 142.

In addition, the first joint 140 further includes a portion extending longitudinally from the ball 141, and the extending portion is coupled to the body 130.

At this time, since the description of the operation and structure of the ball joint is widely known, a more detailed description thereof will be omitted.

Additionally, the first joint 140 communicates with the first gas supply pipe 310.

The gas supplied to the first joint 140 is supplied to the outer space of the ball receiving portion 142 of the first joint 140, moving the ball receiving portion 142 toward the ball 141, and causing the ball 141 to move. and the ball receiving portion 142 are positioned in contact with each other.

Therefore. The ball 141 of the first joint 140 can be fixed to the ball receiving part 142, and the insertion part-body coupling part 120 and the body 130 can be fixed.

The second joint 150 is located in the inner space of the body 130 and is located on one side of the hole 131 formed in the body 130. The second joint 150 is located inside the hole 131.

The second joint 150 is located on the side of the extension bars 210, 220, 230, and 240, which will be described later, and can be coupled to the extension bars 210, 220, 230, and 240.

The second joint 150 may be formed as a ball joint.

The second joint 150 includes a ball 151 located inside the body 130, a second joint engaging portion 152, and a cylinder engaging portion 153.

The ball 151 is coupled to the second joint coupling portion 152, which will be described later, and a hole into which the extension portion 200 can be inserted is formed in the ball 151.

At this time, the method in which the ball 151 is coupled to the second joint coupling portion 152 is not limited to a specific method. For example, an extended portion that can be inserted into the second joint engaging portion 152 may be formed from one side of the ball 151.

The distance between the ball 151 and the second joint coupling portion 152 is adjusted, so that the position of the extension portion 200 can be adjusted and used to conquer it.

The second joint engaging portion 152 is a portion surrounding the ball 151, and one of the second joint engaging portions 152 is positioned at a predetermined distance from the ball 151 before gas is supplied.

At this time, the second joint engaging portion 152 may be located on both sides of the ball 151. In addition, among the second joint coupling parts 152 located on both sides of the ball 151, the second joint coupling parts 152 located in the opposite direction from the pneumatic cylinder 160 are in contact with the ball 151 without being spaced apart. It may be, but is not limited to this.

The second joint engaging portion 152 is formed to partially surround the inner circumference of the hole 131.

The second joint coupling portion 152 may be coupled to a portion extending from the ball 151.

The second joint coupling portion 152 may be arc-shaped to surround the ball 151.

The second joint coupling portion 152 may move toward the ball 151 according to the injection of gas.

One side of the cylinder coupling portion 153 is coupled to the second joint coupling portion 152, and the other side is coupled to the pneumatic cylinder 160.

The cylinder coupling portion 153 may move toward the ball 151 by receiving pneumatic pressure from the pneumatic cylinder 160. The cylinder coupling portion 153 moves toward the ball 151, so that the ball 151 and the second joint coupling portion 152 can be fixed, and thus the extension portion 200 can be fixed to the body 130. You can.

Before the cylinder coupling part 153 receives pneumatic pressure (before gas supply) by the pneumatic cylinder 160, the ball 151 is partially spaced from the second joint coupling part 152, so the ball 151 can rotate. And accordingly, the extension part 200 can also be rotated.

At this time, among the cylinder coupling portions 153 located on both sides of the ball 151, the cylinder coupling portion 153 located in the opposite direction to the pneumatic cylinder 160 may be fixed to the body 130, but is not limited to this. no.

Figure 6(a) shows that the ball 151 and the second joint engaging portion 152 are partially spaced apart, and Figure 6(b) shows the second joint engaging portion 152 moving toward the ball 151. It shows that the ball 151 and the second joint engaging portion 152 are fixed.

A second gas supply pipe 320, which will be described later, is connected to one side of the pneumatic cylinder 160, and gas can be supplied to the inner space of the pneumatic cylinder 160.

The pneumatic cylinder 160 may be located inside the body 130. One side of the pneumatic cylinder 160 may be in communication with the second gas supply pipe 320 and the other side may be coupled to the second joint 150. Specifically, the pneumatic cylinder 160 may be coupled to the cylinder coupling portion 153 of the second joint 150.

When gas is supplied to the inner space of the pneumatic cylinder 160, the second joint coupling portion 152 and the cylinder coupling portion 153 may be moved toward the ball 151.

When gas is supplied to the pneumatic cylinder 160, the second joint engaging portion 152 moves toward the ball 151, and the second joint engaging portion 152 and the ball 151 come into contact with each other, causing the ball 151 to move. It is fixed, and the extension part 200 can be fixed to the body 130.

That is, in the present invention, ball joints are used as the first joint 140 and the second joint 150 to enable free movement during the process of reduction, and then, when reduction is achieved, gas is supplied to apply pressure, It can be immediately and firmly fixed.

The extension part 200 is located between the first fixing part 100a and the second fixing part 100b, and adjusts the distance between the first fixing part 100a and the second fixing part 100b.

In the first embodiment of the present invention, the extension part 200 includes a first extension bar 210 and a second extension bar 220.

The first extension bar 210 and the second extension bar 220 are respectively inserted into the two holes 131 formed in the body 130, and the first extension bar 210 and the second extension bar 220 are It is coupled to the second joint 150.

Additionally, in the second embodiment of the present invention, the extension part 200 includes a third extension bar 230 and a fourth extension bar 240. Referring to Figure 8, a second embodiment is shown.

One end of the third extension bar 230 is inserted into the first fixing part 100a, and the other end is coupled to the second extension bar 220.

One end of the fourth extension bar 240 is inserted into the second fixing part 100b, and the other end is coupled to the first extension bar 210.

The third extension bar 230 and the fourth extension bar 240 may be coupled by a screw 250.

In the present invention, after temporary conquest is achieved, when additional distraction and compression is required using the extended third and fourth extension bars 230 and 240 connecting the bodies 130, the screw 250 is turned to remove 3, The length of the fourth extension bars 230 and 240 may be adjustable.

The third extension bar 230 and the fourth extension bar 240 may be formed with a hole (not shown) into which the screw 250 can be coupled.

The gas injection unit 300 supplies gas to the first joint 140 and supplies gas to the pneumatic cylinder 160.

The gas injection unit 300 includes a first gas supply pipe 310, a second gas supply pipe 320, a gas storage unit, and a switch 330.

The first gas supply pipe 310 moves gas and communicates with the first joint 140. The first gas supply pipe 310 receives gas from the gas storage unit.

The second gas supply pipe 320 moves gas and is in communication with the pneumatic cylinder 160. The second gas supply pipe 320 receives gas from the gas storage unit.

Additionally, a gas distributor may be located on the first gas supply pipe 310 and the second gas supply pipe 320 to distribute the supplied gas.

At this time, the location and number of the first gas supply pipe 310 and the second gas supply pipe 320 are not limited to those shown.

The switch 330 supplies gas from the gas storage unit to either the first gas supply pipe 310 or the second gas supply pipe 320.

The switch 330 includes an operating pedal, and when the operating pedal rotates under pressure, gas is supplied from the gas storage unit to one or more of the first gas supply pipe 310 and the second gas supply pipe 320. .

The switch 330 may refer to a foot switch that rotates an operating pedal by operating with the foot, but the structure of the switch 330 is not limited to this.

The gas supplied from the gas injection unit 300 refers to N2 gas, but is not limited thereto.

Above, the present invention has been described with reference to the embodiments shown in the drawings so that those skilled in the art can easily understand and reproduce the present invention, but these are merely illustrative examples, and various modifications and equivalent alternatives can be made by those skilled in the art from the embodiments of the present invention. It will be appreciated that embodiments are possible. Therefore, the scope of protection of the present invention should be determined by the scope of the patent claims.

(Explanation of symbols)

100: fixing part

100a: first fixing part

100b: second fixing part

110: Insertion part

120: Insertion part-body coupling part

130: body

131: Hall

132: upper part

133: lower part

140: first joint

141: ball

142: Ball receiving portion

143: Cover part

150: second joint

151: ball

152: Second joint coupling part

153: Cylinder coupling part

160: Pneumatic cylinder

200: extension part

210: first extension bar

220: Second extension bar

230: Third extension bar

240: Fourth extension bar

250: screw

300: Gas injection part

310: first gas supply pipe

320: Second gas supply pipe

330: switch

Claims

A fixing part 100 including a first fixing part 100a fixed to a part of the bone, and a second fixing part 100b positioned spaced apart from the first fixing part 100a and fixed to another part of the bone. ;

An extension part 200 coupled to the first fixing part 100a and the second fixing part 100b; and

It includes a gas injection unit 300 that injects gas into the first fixing part 100a and the second fixing part 100b,

The fixing parts (100a, 100b) are,

An insertion portion 110 that is inserted and fixed into the bone;

an insertion part-body coupling part 120 into which the insertion part 110 is inserted and coupled to the body 130;

The body 130 is located on one side of the insertion part-body coupling part 120 and has a hole 131 into which the extension part 200 is inserted;

A first joint 140 that couples the insertion part-body coupling part 120 and the body 130;

a second joint 150 located on one side of the hole 131 and combining the body 130 and the extension portion 200; and

It further includes a pneumatic cylinder (160), one side of which is in communication with the gas injection unit (300) and the other side of which is coupled to the second joint (150), wherein the first joint (140) and the second joint (150) is a ball joint, each including balls 141 and 151,

The first joint 140 couples the insertion part-body coupling part 120 and the body 130, and the insertion part-body coupling part relative to the body 130 by rotation of the ball 141. (120) is rotatable, and the second joint 150 couples the body 130 and the extension portion 200, and rotates the ball 151 to move the extension portion relative to the body 130. (200) is rotatable,

The gas injection unit 300 injects gas into one side of the first joint 140 and the pneumatic cylinder 160, and when the gas is injected, the insertion unit-body coupling unit is connected to the body 130. (120) is fixed, and the extension portion 200 is fixed to the body 130,

Shin Yeon-gi.
According to paragraph 1,

The second joint 150 is,

The ball 151 coupled to the extension portion 200;

a second joint coupling portion 152 extending along the inner circumference of the hole 131 and coupled to the outside of the ball 151; and

It further includes a cylinder coupling portion 153, one side of which is coupled to the second joint coupling portion 152, and the other side of which is coupled with the pneumatic cylinder 160, wherein the second joint coupling portion 152 and the cylinder The coupling portion 153 moves toward the ball 151 when gas is supplied to the pneumatic cylinder 160, and the ball 151 is fixed as the second joint coupling portion 152 and the ball 151 come into contact with the ball 151. The extension portion 200 is fixed to the body 130,

Shin Yeon-gi.
According to claim 1 or 2,

The first joint 140 is,

A ball receiving portion 142, which is a space where the ball 141 is located; and

It further includes a cover part 143 located inside the insertion part-body coupling part 120 and covering the ball receiving part 142 from the outside,

The part extending from the ball 141 is coupled with the insertion part-body coupling part 120,

The cover part 143 is in communication with the gas injection part 300,

Shin Yeon-gi.
According to paragraph 3,

When gas is supplied to the outside of the ball receiver 142 through the cover part 143, the ball receiver 142 moves toward the ball 141 and the ball receiver 142 and the ball 141 In this contact, the insertion part-body coupling part 120 and the body 130 are fixed,

When gas is supplied to the pneumatic cylinder 160, the second joint engaging portion 152 moves toward the ball 151, and the second joint engaging portion 152 and the ball 151 come into contact with each other.

The extension portion 200 is fixed to the body 130,

Shin Yeon-gi.
According to paragraph 1,

Two holes 131 are formed in the body 130 and are spaced apart from each other,

The extension portion 200 includes a first extension bar 210 and a second extension bar 220 respectively coupled to the two holes 131,

Shin Yeon-gi.
According to paragraph 1,

The extension portion 200 is,

A third extension bar 230 inserted into the first fixing part 100a;

a fourth extension bar 240, one end of which is inserted into the second fixing part 100b and the other end of which is coupled to the third extension bar 230; and

Further comprising a screw 250 coupling the third extension bar 230 and the fourth extension bar 240,

Shin Yeon-gi.
According to claim 1 or 5,

The body 130 is

upper part 132; and

A lower portion (133) extending downward from the upper portion (132) and having a shorter longitudinal length in the horizontal cross-section than the upper portion (132),

Shin Yeon-gi.
According to paragraph 1,

The gas injection unit 300,

a first gas supply pipe 310 through which gas moves from the gas storage unit and in communication with the first joint 140;

A second gas supply pipe 320 through which gas moves from the gas storage unit and in communication with the pneumatic cylinder 160; And

Including a switch 330 that controls communication between the gas storage unit and the first gas supply pipe 310 and the second gas supply pipe 320.

Shin Yeon-gi.
According to clause 8,

The switch 330 is a foot switch that is operated with the foot to rotate the operating pedal,

The switch 330 includes the operation pedal, and when the operation pedal rotates under pressure, gas is supplied from the gas storage unit to the first gas supply pipe 310 and the second gas supply pipe 320.

Shin Yeon-gi.