KR102502478B1 - Acupuncture set for double blind test - Google Patents

Abstract

In investigating the therapeutic effect of acupuncture, the present invention relates to a real acupuncture set for double-blind testing with an improved structure so that it is difficult for the operator as well as the subject to distinguish whether the needle used is a real acupuncture needle or a false acupuncture needle. The real acupuncture set for double blinding according to the present invention includes a support member having one surface in contact with the skin of a person to be treated and having through-holes formed in the vertical direction; A filling member coupled to the through hole of the support member and provided in a pipe shape with one side shielded; a hollow guide member having a lower portion coupled to the through hole of the support member and having a first guide protrusion protruding therein; and moving in a vertical direction within the guide member in a state of engagement with the recession, a portion of which is caught on the first guide protrusion to guide the start of a magnetic needle, and passes through the first guide protrusion during magnetic acupuncture and is seated on the upper end of the guide member. It may include; a moving member for guiding the recession to penetrate the skin of the filling member and the person to be treated.

Description

Acupuncture set for double blind test}

The present invention relates to a double-blind real acupuncture set that makes it difficult to distinguish whether the acupuncture needle used is real or false acupuncture, not only the recipient but also the operator, in verifying the therapeutic effect of acupuncture. More specifically, acupuncture A real acupuncture needle set for double-blind use with improved reliability of verification results by guiding start and end positions of recession.

Recently, studies that statistically investigate the therapeutic effects of acupuncture have been actively conducted. As a method of examining the therapeutic effect of such acupuncture, a method of comparing real acupuncture and sham acupuncture to the subject is mainly used. That is, stimulation similar to acupuncture, for example, placebo stimulation, is applied to the acupuncture point of the person to be treated as a control group, and a real needle is inserted and used as a needle acupuncture group to compare the effects of the two.

However, in the conventional method of examining the treatment effect of acupuncture therapy, a method of masking only the recipient, that is, a single blind method that blocks only visually, is widely practiced, so there is a problem in conveying the operator's expectations or enthusiasm for acupuncture to the recipient. there was.

Therefore, in order to strictly confirm the effect of acupuncture therapy, masking is performed on the operator as well as the operator, so that both the operator and the operator do not know whether the currently operated acupuncture needle is a real needle or a false needle. necessity is emerging.

Registered Patent Publication 10-2137777 (Announced on July 20, 2020)

The object of the present invention is to guide the starting and ending positions of the stagnant so that the stagnation can be inserted into the skin of the recipient at a constant depth during acupuncture, thereby improving reliability of a double-blind real acupuncture needle in verifying the therapeutic effect of acupuncture. in providing a set.

A real acupuncture set for double blindness according to the present invention for achieving the above object includes a support member having one surface in contact with the skin of a person to be treated and having through-holes formed in the vertical direction; A filling member coupled to the through hole of the support member and provided in a pipe shape with one side shielded; a hollow guide member having a lower portion coupled to the through hole of the support member and having a first guide protrusion protruding therein; and moving in a vertical direction within the guide member in a state of engagement with the recession, a portion of which is caught on the first guide protrusion to guide the start of a magnetic needle, and passes through the first guide protrusion during magnetic acupuncture and is seated on the upper end of the guide member. It may include; a moving member for guiding the recession to penetrate the skin of the filling member and the person to be treated.

In addition, a guide groove into which the first guide protrusion is inserted may be formed on an outer portion of the movable member.

In addition, the first guide protrusion may be provided in a hemispherical shape, provided in plurality, and spaced apart from each other along the inner circumference of the guide member.

In addition, a second guide protrusion located below the first guide protrusion protrudes from the inner surface of the guide member, and the movable member is caught on the second guide protrusion during a needle insertion so that the stagnation moves to a predetermined depth on the skin of the person to be treated. can be guided to be inserted into.

In addition, the second guide protrusion may be formed in a hemispherical shape, and the predetermined depth may be provided in a size of 3 mm to 10 mm.

In addition, a film having elasticity similar to human skin tissue may be formed on the surface of the filling member in contact with the skin of the person to be treated.

In addition, a step may be formed inside the support member so that the lower surface of the guide member can be seated.

In addition, the support member includes a cylindrical coupling portion having the through hole formed therein in a vertical direction, and a support portion extending outward from a lower end of the coupling portion and contacting the skin of a person to be treated, and the support member during acupuncture. A medical adhesive film may be provided on the lower surface of the support part to prevent the member from being separated from the skin of the person to be treated.

In addition, the movable member is formed to be movable in the vertical direction by the operator in a state inserted into the guide member, and has an insertion portion formed with a stepped portion in which a portion of the recession is seated, and an outward direction from an upper end of the insertion portion. , and may include a seating portion seated on an upper end of the guide member to guide an end of the magnetic needle.

In addition, the depression may include acupuncture part coupled to the inside of the movable member, and an acupuncture tip protruding downward from the acupuncture part and having a pointed end penetrating the skin of a person to be treated.

In addition, it may further include a current supply unit for supplying current to the recession to transmit an electrical stimulation signal to the skin.

In addition, an upper portion of the depression may be exposed to the outside of the movable member so as to be connected to the current supply unit.

The real acupuncture set for double blinding according to the present invention includes a support member having one surface in contact with the skin of a person to be treated and having through-holes formed in the vertical direction; A filling member coupled to the through hole of the support member and provided in a pipe shape with one side shielded; a hollow guide member having a lower portion coupled to the through hole of the support member and having a first guide protrusion protruding therein; By moving in the vertical direction in the guide member in a state of engagement with the recession, the guide groove formed on the side is caught on the first guide protrusion to guide the start of the magnetic needle, and the guide member passes through the first guide protrusion during magnetic acupuncture. A moving member seated at the top and guiding the recession to penetrate the support plate and the skin of the pisisulja; and a current supply unit for supplying current to the depression exposed to the outside of the movable member to transmit an electrical stimulation signal to the skin of a person to be treated.

In addition, a second guide protrusion located below the first guide protrusion protrudes from the inner surface of the guide member, and the movable member is caught on the second guide protrusion during an acupuncture needle so that the recession is 3 mm to 10 mm deep. It can be guided to be inserted into the skin of the person.

In addition, the first guide protrusion and the second guide protrusion are provided in a hemispherical shape, provided in plurality, and spaced apart from each other along the inner circumference of the guide member.

According to the present invention, as the positions of the start and end of stagnation are guided, acupuncture can always start and end at the same position. Accordingly, since the stagnation is always inserted into the skin at the same depth during acupuncture, accuracy in verifying the treatment effect of acupuncture can be improved.

In addition, during the needle acupuncture, the movable member is caught on the second guide protrusion so that the stagnant is not completely inserted, thereby reducing the pain of the acupuncture recipient. Therefore, it becomes difficult for the recipient to distinguish whether the acupuncture is a real acupuncture or a false acupuncture, which can improve the reliability of the acupuncture.

In addition, the support member is formed of an opaque material so that the tip of the recess is not visible from the outside, so that when using a real needle set for double-blind use, both the operator and the operator cannot distinguish whether it is a real needle or a false needle, which is suitable for double-blind use. The reliability of real needle sets can be improved.

1 is a cross-sectional view of a real acupuncture needle set for double-blind use according to an embodiment of the present invention.
Figure 2 is an exploded view of Figure 1;
FIG. 3 is a diagram for explaining the operation of the real acupuncture needle set for double blinding shown in FIG. 1;
4 is a cross-sectional view of a real acupuncture needle set for double-blind use according to another embodiment of the present invention.

Hereinafter, a real acupuncture set for double-blind use according to a preferred embodiment will be described in detail with reference to the accompanying drawings. Here, the same reference numerals are used for the same components, and repeated descriptions and detailed descriptions of known functions and configurations that may unnecessarily obscure the subject matter of the invention are omitted. Embodiments of the invention are provided to more completely explain the present invention to those skilled in the art. Accordingly, the shapes and sizes of elements in the drawings may be exaggerated for clarity.

1 is a cross-sectional view of a genuine acupuncture needle set for double-blind use according to an embodiment of the present invention, and FIG. 2 is an exploded view of FIG. 1 . And, FIG. 3 is a diagram for explaining the operation of the real acupuncture needle set for double blinding shown in FIG. 1 .

Referring to FIGS. 1 to 3 , the real acupuncture set 100 for double-blind use may include a support member 110, a filling member 120, a guide member 130, and a moving member 140. . Here, double blind means a technique in which both the experimenter and the subject do not know whether an actual change is actually being made in a study for verifying the effect of a certain experiment. That is, double-blindness in the present specification refers to a technique for making it difficult for the operator as well as the person to be operated on to distinguish whether the acupuncture is a real acupuncture or a false acupuncture when performing acupuncture on a person to be operated on.

One surface of the support member 110 is in contact with the skin of the person being treated (S), and a through hole (110a) may be formed in the vertical direction. For example, the support member 110 may be formed of a polypropylene material that is easy to process and has good strength, and may include a coupling part 111 and a support part 112 .

The lower surface of the coupling part 111 may be in contact with the skin S of the person to be treated, and may be formed in a cylindrical shape with a through hole 110a formed in the vertical direction at the inner center.

The support portion 112 extends outward from the lower end of the coupling portion 111 and may be in contact with the skin S of the person being treated. In addition, a medical adhesive film 160 may be provided on the lower surface of the support part 112 to prevent the support member 110 from being separated from the skin S of the person to be treated during acupuncture. For example, the medical adhesive film 160 may be provided as 3M's 1522 transparent double-sided medical adhesive film 160, which is processed into a shape corresponding to the lower surface of the support part 112, so that the lower surface of the support part 112 can be coupled to

The filling member 120 may be provided in a pipe shape coupled to the through hole 110a of the support member 110 and having one side shielded. For example, the filling member 120 is formed in a cylindrical shape in which the insertion hole 120a is formed long in the longitudinal direction at the inner center so that the end of the recession 150 can pass through, and is in contact with the skin S of the person to be treated. A film 121 having elasticity similar to human skin tissue may be formed on the cotton. For example, the filling member 120 may be formed of a silicon material.

In this way, as the filling member 120 is formed of a material having elasticity similar to the tissue of the skin (S) of the human body, the operator determines whether the recession 150 penetrates the filling member 120 and is inserted into the actual skin (S). , it becomes impossible to distinguish whether it is inserted only into the filling member 120. Therefore, it becomes difficult for the operator to distinguish whether the real needle set 100 for double-blind use used in the experiment to prove the verification effect of the acupuncture procedure is a real needle or a false needle.

A lower portion of the guide member 130 may be coupled to the through hole 110a of the support member 110, and a first guide protrusion 131 may protrude therein. For example, the guide member 130 may be formed in a cylindrical shape having a hollow 130a formed therein, and may be formed of a polypropylene material. In addition, a step 113 is formed inside the support member 110, so that the lower surface of the guide member 130 can be coupled to the support member 110 while being seated on the step 113. For example, the guide member 130 may be coupled to the inside of the support member 110 by way of interference fit, screw coupling, bonding, or the like.

The first guide protrusion 131 protruding from the inside of the guide member 130 is provided in a hemispherical shape, and may be provided in plural and spaced apart along the inner circumference of the guide member 130 . For example, the first guide protrusions 131 may be provided as a pair and disposed to face each other inside the guide member 130, but the number of first guide protrusions 131 is not limited to the illustrated bar. . Also, the first guide protrusions 131 may be provided in multiple stages spaced apart in the vertical direction as shown in FIG. 1 . In this way, when the first guide protrusions 131 are arranged in multiple stages, the coupling force with the moving member 140 described later can be improved.

The movable member 140 may move vertically within the guide member 130 while being coupled with the recession 150 . For example, a part of the movable member 140 is hooked on the first guide protrusion 131 to guide the start of a magnetic needle, and passes through the first guide protrusion 131 to settle on the top of the guide member 130 during magnetic needle insertion. 150 may guide the filling member 120 and the skin (S) of the person to be treated.

Specifically, the moving member 140 may be formed of a polypropylene material, and may include an insertion part 141 and a seating part 142 .

Insertion portion 141 is formed to be movable in the vertical direction by the operator in a state inserted into the guide member 130, and a step 143 in which a portion of the recession 150 is seated therein may be formed. Also, a guide groove 141a into which the first guide protrusion 131 of the guide member 130 is inserted may be formed on an outer side of the insertion portion 141 . Accordingly, when the lower end of the movable member 140 is moved downward while being inserted into the hollow 130a, the first guide protrusion of the guide member 130 in the guide groove 141a of the movable member 140 ( 131 is caught and the movement of the moving member 140 may be stopped. That is, when the guide groove 141a of the movable member 140 and the first guide protrusion 131 of the guide member 130 are coupled, the magnetic needle starts. At this time, the pointed end of the depression 150 may be located in the through hole 110a of the support member 110 as shown in FIG. 3 (a).

The seating portion 142 extends outward from the upper end of the insertion portion 141 and is seated on an upper end of the guide member 130 to guide the end of the magnetic needle. That is, when force is applied to the moving member 140 in the downward direction in the state of FIG. 3 (a), the moving member 140 is deformed toward the inner coupling hole 140a, and the first guide protrusion 131 and the guide groove The coupling of (141a) can be released, so that the movable member 140 can move in the downward direction. In this state, when the mounting portion 142 protruding outward from the insertion portion 141 is caught on the upper end of the guide member 130, the movement of the moving member 140 may be stopped, and the moving member 140 may further Since the patient cannot move abnormally, the needle can be terminated. At this time, the sharp end of the depression 150 may be formed to penetrate the skin (S) of the person being treated, as shown in FIG. 3 (c).

Meanwhile, the guide member 130 may further include a second guide protrusion 132 located below the first guide protrusion 131 . For example, the second guide protrusion 132 may be formed in a hemispherical shape protruding from the inner surface of the guide member 130 and may be located about 7 mm below the first guide protrusion 131 . Accordingly, as shown in FIG. 3(b), the movable member 140 catches the second guide protrusion 132 during the needle insertion and guides the recess 150 to be inserted into the skin S of the person to be treated. can

The reason for adjusting the insertion depth of the recess 150 through the moving member 140 before the end of the needle is that if the end of the recess 150 is deeply inserted into the skin S at once, it may cause pain to the operator, and thin Since the needle can be bent due to its characteristics, after penetrating the end of the stagnation 150 through the skin S to a certain depth, the stagnation 150 is rotated to insert the end of the stagnation 150 deeper into the desired depth. . That is, the second guide protrusion 132 is for guiding the end of the stagnation 150 to be inserted into the skin (S) of the recipient at a preset depth during acupuncture, and the end of the stagnation 150 before the end of the acupuncture needle is about 3 mm It can be inserted to a depth of ~ 10 mm.

For example, when an external force is applied downward to the movable member 140 in the needle preparation step of FIG. The movement may be stopped by being caught on the upper end of the 2 guide protrusions 132 . At this time, the end of the recession 150 coupled to the moving member 140 can be inserted into the skin (S) of the person to be treated at a depth of 3mm to 10mm, and in this state, the moving member 140 or the recession 150 is gripped. When rotating in one direction by doing so, the recession 150 goes deeper into the skin S as shown in FIG. 3(c).

The depression 150 is coupled to the movable member 140 and operates in conjunction with the movable member 140, and may include a needle needle part 151 and a needle tip 152.

The needle part 151 is a part constituting the upper part of the recession 150, and may be coupled to the movable member 140 by a method such as an interference fit or screw coupling. Here, a step 143 is formed inside the movable member 140, so that the lower end of the needle part 151 can be coupled to the step 143 of the movable member 140 in a seated state.

The acupuncture point 152 is a part that forms the lower part of the recess 150 and is inserted into the skin S, protrudes downward from the needle part 151, and has a pointed end penetrating the skin S of the person to be treated. can be formed as For example, when the movable member 140 is caught on the first guide protrusion 131, the needle tip 152 may be disposed in the through hole 110a of the support member 110 as shown in FIG. 3(a). When the movable member 140 is caught on the second guide protrusion 132, as shown in FIG. 3(b), the movable member 140 may be disposed to penetrate the skin S of the person to be treated, and the movable member 140 guides the movable member 140. When seated on the upper end of the member 130, as shown in FIG. 3(c), it can be inserted more deeply into the skin S of the person being treated than in the state of FIG. 3(b).

The end of the needle tip 152 may be disposed in the support member 110 so as not to be visible from the outside. For example, the support member 110 may be formed of an opaque material so that the pointed end of the needle tip 152 is not visible from the outside. Accordingly, since both the operator and the recipient cannot visually confirm that the recess 150 is inserted into the skin S, it is impossible to distinguish between a real needle and a false needle during a procedure using the real acupuncture set 100 for double blinding. .

4 is a cross-sectional view of a real acupuncture needle set for double-blind use according to another embodiment of the present invention. In this embodiment, description will be made focusing on contents that are different from the examples described above.

Referring to FIG. 4 , the real acupuncture needle set 200 for double-blindness may further include a current supply unit 170 for supplying current to the stagnation 150 to transmit electrical stimulation signals to the skin S.

For example, an upper part of the needle part 151 may be exposed to the outside of the movable member 140 so that the recess 150 can be connected to the current supply unit 170 . Accordingly, when the current supply unit 170 is electrically connected to the needle unit 151, the current supply unit 170 can supply current having a frequency in the range of 1 Hz to 100 Hz to the recess 150. At this time, the current supply unit 170 may include a variable resistor and a control unit in order to supply current having a frequency in the range of 1 Hz to 100 Hz to the recession 150. Since this structure is a known technology, a detailed description thereof will be omitted. do it with

In this way, as the real acupuncture set 200 for double-blindness is provided with the current supply unit 170, it is possible to experiment and verify the treatment effects of electric acupuncture as well as general acupuncture.

As described above, in the real acupuncture set 100 for double-blind use, as the start and end positions of the recesses 150 are guided, the acupuncture treatment can always start and end at the same position. Accordingly, since the stagnation 150 is always inserted into the skin S at the same depth during acupuncture, accuracy in verifying the treatment effect of acupuncture can be improved.

In addition, the movable member 140 is caught on the second guide protrusion 132 during the needle insertion so that the stagnant 150 is not completely inserted, thereby reducing the pain of the person undergoing the acupuncture procedure. Therefore, it becomes difficult for the person receiving the treatment to distinguish whether the acupuncture is a real acupuncture or a false acupuncture, which can improve the reliability of the real acupuncture set 100 for double-blind use.

In addition, the support member 110 is formed of an opaque material so that the end of the recess 150 is not visible from the outside, so that when using the real acupuncture set 100 for double-blind use, both the operator and the operator can distinguish between real and false needles. This can improve the reliability of the real needle set 100 for double-blind use.

Referring to FIGS. 1 to 4, a method of using a real acupuncture needle set for double blinding will be described below.

First, after inserting the end of the movable member 140 into the guide member 130, the first guide protrusion 131 is temporarily coupled to the guide groove 141a to prepare for the start of the magnetic needle. In this state, after the lower surface of the support member 110 is seated on the skin (S) of the person to be treated, the movable member 140 is moved downward so that the pointed end of the recession 150 can penetrate the skin (S) of the person to be treated. move At this time, the medical adhesive film 160 is provided on the lower side of the support member 110, so that the support member 110 can be prevented from being separated from the skin S of the person to be treated during acupuncture.

Then, the movable member 140 moves in a downward direction, and the lower surface of the movable member 140 is caught by the second guide protrusion 132 during the movement, and the sharp end of the recession 150 touches the skin S of the person being treated. It can be inserted to a depth of about 3 mm. At this time, since the support member 110 is made of an opaque material, it is not visible from the outside that the tip of the recess 150 is inserted into the skin S, so both the operator and the person receiving the acupuncture can distinguish whether it is a real needle or a false needle. will not be able to

In this state, when force is applied downward while rotating the stagnation 150, the stagnation 150 goes deeper into the skin S of the person being treated. Here, when the seating part 142 of the movable member 140 is seated on the upper end of the guide member 130, the magnetic needle can be terminated, and after the end of the magnetic needle, the end of the recess 150 is placed on the skin (S) of the person to be treated. It can be inserted to a depth of about 10 mm.

As such, since the start and end positions of the recession 150 are constantly maintained during the acupuncture treatment, the reliability of verifying the treatment effect of the acupuncture treatment can be improved.

Meanwhile, in a state in which the stagnation 150 is inserted into the skin (S) of the person to be treated, the electric acupuncture treatment may be performed by connecting the terminal of the current supply unit 170 to the acupuncture point 152. For example, the current supply unit 170 may supply current having a frequency in the range of 1 Hz to 100 Hz to the needle tip 152, and in this case, the needle tip 152 transmits an electrical stimulation signal of the current to the skin (S). Thus, it is possible to experiment and verify the therapeutic effect of electroacupuncture.

The present invention has been described with reference to an embodiment shown in the accompanying drawings, but this is only exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. You will be able to. Therefore, the true protection scope of the present invention should be defined only by the appended claims.

110: support member
111: coupling part
112: support
120: filling member
121 film
130: guide member
131: first guide projection
132: second guide projection
140: moving member
141: insertion part
141a: guide groove
142: seating part
150: stagnation
160: adhesive film
170: current supply unit

Claims (15)

a support member having one surface in contact with the skin of a person being treated and having through-holes formed in the vertical direction;
A filling member coupled to the through hole of the support member and provided in a pipe shape with one side shielded;
a hollow guide member having a lower portion coupled to the through hole of the support member and having a first guide protrusion protruding therein; and
It is moved up and down in the guide member in a state of being coupled with the recession, and a part is caught on the first guide protrusion to guide the start of the magnetic needle, and is seated on the top of the guide member through the first guide protrusion during magnetic acupuncture. A moving member for guiding the recession to penetrate the filling member and the skin of the person to be treated;
A guide groove into which the first guide protrusion is inserted is formed on an outer portion of the movable member,
A second guide protrusion located below the first guide protrusion protrudes from the inner surface of the guide member, and the movable member is caught on the second guide protrusion during a needle insertion, and the recession is inserted into the skin of a person to be treated at a predetermined depth. Real acupuncture set for double-blind trials to guide you as much as possible.
delete According to claim 1,
The first guide protrusion is provided in a hemispherical shape, provided in plural, and disposed spaced apart from each other along the inner circumference of the guide member.
delete According to claim 1,
The second guide protrusion is formed in a hemispherical shape, and the preset depth is provided in a size of 3 mm to 10 mm.
According to claim 1,
The filling member is a real needle set for double-blind use in which a film having elasticity similar to human skin tissue is formed on a surface in contact with the skin of a person to be treated.
According to claim 1,
A real acupuncture needle set for double-blindness wherein a step is formed on the inside of the support member so that the lower surface of the guide member can be seated.
According to claim 1,
The support member includes a cylindrical coupling portion in which the through hole is formed in the vertical direction therein, and a support portion extending outward from a lower end of the coupling portion and contacting the skin of a person to be treated,
A real acupuncture needle set for double-blind use, wherein a medical adhesive film is provided on the lower side of the support member to prevent the support member from being separated from the skin of the person to be treated during a needle insertion.
According to claim 1,
The moving member,
An insertion portion formed to be movable in a vertical direction by an operator in a state inserted into the guide member and having a stepped portion in which a portion of the depression is seated;
A real acupuncture needle set for double-blind use including a seating portion extending outward from an upper end of the insertion portion and seated on an upper end of the guide member to guide an end of the magnetic needle.
According to claim 1,
The stagnation is
A chimney unit coupled to the inside of the movable member;
A real acupuncture needle set for double-blindness including a needle tip protruding downward from the acupuncture unit and having a pointed end penetrating the skin of the recipient.
According to claim 1,
The double-blind real acupuncture set further comprising a current supply unit for supplying current to the recess to transmit an electrical stimulation signal to the skin.
According to claim 11,
The real acupuncture needle set for double blinding wherein an upper part of the recess is exposed to the outside of the moving member so that it can be connected to the current supply unit.
a support member having one surface in contact with the skin of a person being treated and having through-holes formed in the vertical direction;
A filling member coupled to the through hole of the support member and provided in a pipe shape with one side shielded;
a hollow guide member having a lower portion coupled to the through hole of the support member and having a first guide protrusion protruding therein;
By moving in the vertical direction within the guide member in a state of engagement with the recession, the guide groove formed on the side is caught on the first guide protrusion to guide the start of the magnetic needle, and the guide member passes through the first guide protrusion during magnetic acupuncture. a moving member seated on an upper end and guiding the recession to penetrate the skin of the filling member and the person to be treated; and
A current supply unit for supplying current to the stagnation exposed to the outside of the moving member to transmit an electrical stimulation signal to the skin of a person to be treated;
A second guide protrusion located below the first guide protrusion protrudes from the inner surface of the guide member, and the movable member is caught on the second guide protrusion during a needle needle so that the recession is 3 mm to 10 mm deep on the skin of the recipient. A double-blind real needle set guided to be inserted into the
delete According to claim 13,
The first guide protrusion and the second guide protrusion are provided in a hemispherical shape, provided in plural, and spaced apart from each other along the inner circumference of the guide member.

Images