KR101712623B1 - Safety syring - Google Patents

Abstract

Provided is a safety syringe. A safety syringe according to an embodiment of the present invention comprises: a cylinder; a holder member having a passing hole for feeding an injection to the inside thereof through a syringe needle, and having a first hanging projection formed on the inner circumferential surface of the passing hole; a stopper member having a flowing hole formed in the center thereof to communicate with the passing hole, and having an inner container part formed on the inner circumferential surface of the flowing hole to have a second hanging projection, wherein the inner container part can be fixed to the rear of the holder member; and a piston capable of forwardly or backwardly moving in the cylinder, having an axial member capable of being disposed while penetrating through the inner container part, having a first hook part formed on the front outer circumferential part of the axial member, and having a second hook part formed on the rear outer circumferential part of the axial member. When the piston is backwardly moved, the stopper member can be backwardly moved along with the piston while the second hook part is hung on the second hanging projection of the stopper member. When the stopper member is backwardly moved while the second hook part is hung on the second hanging projection, the stopper member and the holder member can be backwardly moved along with the piston while the first hook part is hung on the first hanging projection.

Description

Safety syring {

The present invention relates to a safety syringe.

In general, a syringe is used to collect blood from a patient's blood vessel or to collect other body fluids in the body. On the other hand, it is used to inject drugs directly into the blood vessels or to inject drugs into the muscles or subcutaneously.

That is, the syringe can be used to collect body fluids in the body or to inject injections into the body.

On the other hand, in order to transfer the drug contained in the glass ampoule or the small glass bottle containing the rubber stopper into the syringe when the injection is injected into the body through the syringe, the upper part of the glass ampoule is cut and the injection needle I will inhale the drug to be injected.

The injection needle of the syringe thus used is covered with a protective cap and then discarded. At this time, a doctor or a nurse using a syringe is often stuck to the needle, and the protective cap on the needle is also separated during the disposal process of the syringe, so that the disposal operator is also stuck to the needle.

In this case, there is a second infectious problem when a syringe handler or a disposal handler is stabbed in an injection needle used for a patient having an infectious pathogen such as a patient of type B infection or AIDS.

In order to prevent this, a needle may be built into the cylinder. However, in order to embed the injection needle into the cylinder, the injection needle is moved into the cylinder by engaging the shaft member of the piston with the rear portion of the injection needle and pulling the piston backward.

At this time, in order to move the injection needle coupled into the cylinder with the shaft member of the piston and move the cylinder into the cylinder, a large amount of force is required to move the piston backward. And because there are many syringes that need to dispose of needles a day, it is necessary to construct a syringe that can dispose of needles without much effort.

An embodiment of the present invention provides a safety syringe capable of easily moving the injection needle into the cylinder.

According to an aspect of the present invention, A holder member having a through hole through which the injection liquid flows into the interior through the injection needle, and a first latching protrusion formed on an inner circumferential surface of the through hole; A stopper member having an inner tubular portion formed with a flow hole communicating with the through hole at the center thereof and having a second stopping protrusion formed on the inner circumferential surface of the flow hole, the inner tubular portion being positionable behind the holder member; And a second hook portion formed on a rear side outer peripheral portion of the shaft member, wherein the first hook portion is formed on a front side outer peripheral portion of the shaft member, And a piston which is movable forward or rearward in the cylinder, wherein the stopper member is engaged with the piston in a state in which the second hook portion is caught by the second engaging jaw of the stopper member as the piston is moved backward, When the stopper member is moved rearward in a state where the second hook portion is caught by the second stopping jaw, the first hook portion is caught by the first stopping jaw, And the holder member is formed to be movable rearward with the piston.

Further, when the piston is advanced to the cylinder front side so that the second hook portion is caught by the second stopping jaw, the first hook portion is located at the front side of the through hole at a distance d away from the first stopping jaw And the first hook portion is pulled rearward to be hooked on the first hooking jaw when the piston is pulled backward, and the stopper member is fixed to the stopper member receiving groove at a predetermined distance d. < / RTI >

Further, the holder member may include a column portion having the through-hole formed at the center thereof; An extending portion extending from the rear of the column portion to the stopper member side to be inserted into the flow hole so that the through hole communicates with the flow hole; And an outer tubular portion spaced apart from the column portion and the extended portion so as to surround the tubular portion and the extended portion, wherein a stopper member receiving groove in which the inner tubular portion is fixed is positioned between the outer tubular portion and the extended portion .

In addition, the first latching jaw may be formed on the inner circumferential surface of the through hole so as to have a larger diameter from the front side to the rear side.

The first latching jaw may be formed with a plurality of first incisions so as to be elastically deformed.

The stopper member may include an outer cylinder surrounding the outer surface of the inner cylinder and spaced apart from the inner cylinder; And a ring portion in which the inner cylinder portion is provided on the inner side in a ring shape and the outer cylinder portion is provided on the outer side portion.

A protrusion inserted into a groove formed in the cylinder may be formed on a front outer surface of the outer cylinder to prevent the holder member from being pushed rearward of the cylinder.

In addition, the inner circumferential surface of the outer cylinder portion may be formed with an inner inclined surface inclined from the front to the rear.

A plurality of second incisions may be formed in the inner tube to elastically deform the inner tube, and a plurality of third incisions may be formed in the outer tube such that the outer tube is elastically deformed. have.

A piston body having the shaft member on a front side thereof, the piston body being inserted into the cylinder and moving along the cylinder; And a gasket coupled to the front of the piston body and inserted into the cylinder so as to be closely contacted with the inside of the cylinder.

The shaft member extends a predetermined length so as to be spaced apart from the first hook portion and the second hook portion. The shaft member, which is extended to a predetermined length, is inserted into the through- And can be discharged to the outside.

The safety syringe according to one embodiment of the present invention allows the user to separate the piston member from the cylinder with a small force and move it behind the holder member and distribute the force to move the piston member and the holder member into the cylinder with greater force, The force used to move the injection needle into the cylinder can move the injection needle into the cylinder with less force than in the prior art.

Further, since the shaft member on which the piston is formed is formed so as to extend to a certain length and inserted into the holder member, the injection member can be discharged to the outside without remaining the injection solution.

1 is a perspective view illustrating a safety syringe according to an embodiment of the present invention.
2 is a cross-sectional view of a safety syringe according to an embodiment of the present invention.
3 is an exploded perspective view of a safety syringe according to an embodiment of the present invention.
4 is a perspective view illustrating a holder member in a safety syringe according to an embodiment of the present invention.
5 is a perspective view showing a cross section of a stopper member in a safety syringe according to an embodiment of the present invention.
6A and 6B are perspective views illustrating a piston in a safety syringe according to an embodiment of the present invention.
7A to 7C are cross-sectional views illustrating a method of operating a safety syringe according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Hereinafter, a safety syringe according to an embodiment of the present invention will be described in detail with reference to the drawings. In order to facilitate the understanding of one embodiment of the present invention, the injection needle side of the safety syringe will be referred to as the front side and the piston side will be referred to as the rear side.

1 to 3, the safety syringe 100 according to one embodiment of the present invention may include a cylinder 110, a holder member 120, a stopper member 130, and a piston 140.

The cylinder 110 may have a hollow cylindrical shape so that the injection liquid can be stored therein. The holder member 120, the stopper member 130, and the piston 140 may be disposed in front of the cylinder 110.

4, the holder member 120 is disposed in front of the cylinder 110, and injects the injection liquid into the cylinder 110 through the injection needle or injects the injection liquid inside the cylinder 110 into the injection needle 150 To the outside. To this end, the holder member 120 includes a post 121, an extension 122,

When the holder member 120 is disposed in the inner front of the cylinder 110, the column portion 121 is formed to protrude forward of the cylinder 110 do. A through hole 124 through which the injection liquid flows is formed inside the column 121 and the front and rear of the through hole 124 communicate with the outside so as to discharge or flow the injection liquid. That is, the front of the through hole 124 communicates with the outside, and the rear of the through hole 124 communicates with the below-described flow hole 135.

Here, the first stopping hook 128 may be formed on the inner circumferential surface of the through hole 124. At this time, the first stopping jaw 128 is formed on the inner circumferential surface of the through hole 124 so as to have a larger diameter from the front to the rear. In addition, a plurality of first cuts 128a may be formed on the first latching jaw 128 so as to be elastically deformed. The first hooking portion 128a is formed on the first hooking jaw 128 so that the first hooking portion 145 described later is elastically deformed when the hooking portion 145 is inserted so that the first hooking portion 145 is engaged with the first hooking jaw 128 And may be inserted and positioned forward. The first hooking protrusion 128 and the first hooking portion 145 are formed to have a larger diameter from the front to the rear and the rear end of the first hook portion 145 having a larger diameter is provided with a first hooking jaw 128 So that the first hook portion 145 can be prevented from being displaced rearward.

The extension portion 122 extends from the rear end portion of the column portion 121 toward the stopper member 130 so that when the stopper member 130 described later is coupled to the rear side of the holder member 120, Is inserted into the flow hole (135) side of the stopper member (130).

The through hole 124 is formed from the front side of the column 121 to the rear side of the extended portion 122 and communicates with the flow hole 135 of the stopper member 130.

A plurality of fourth cuts 122a may be formed on the extension 122 so as to be elastically deformed outward.

Thus, when the holder member 120 is pushed backward by the insertion of the injection needle into the body of the patient, the extension portion 122 is elastically deformed by the fourth cut portion 122a, It is possible to push the stopper member 130 in the horizontal direction.

The outer tube portion 123 is disposed in a cylindrical shape to surround the outer periphery of the column portion 121 and the extended portion 122. The outer tube portion 123 is spaced apart from the column portion 121 and the extended portion 122 by a predetermined distance, And the outer periphery of the extension portion 122. [

A front part of the column 121 protrudes to the outside of the cylinder 110 and a front part of the outer part 123 is coupled to an inner front side of the cylinder 110.

A space 125 to which the needle hub is coupled is formed between the front side of the outer tubular portion 123 and the column portion 121. On the inner circumferential surface on the front side of the tubular outer tubular portion 123, The escape preventing portion 125a, to which the collar of the hub (151 in Fig. 3) is caught, is protruded obliquely. 3) 151 of the needle hub is rotated along the escape prevention portion 125a and is engaged with the space 125 of the outer tube portion 123. After assembly, the needle hub is inserted into the holder member 120, .

A plurality of ribs 123a are provided along the vertical direction on the outer surface of the outer tube 123. The rib 123a is inserted into the rib groove on the inner side of the cylinder to prevent rotation.

An O-ring groove 126 may be formed at the center of the outer circumferential surface of the outer tube portion 123 to be recessed inward to seal the inside of the cylinder 110 and the outer circumferential surface of the holder member 120. Accordingly, the O-ring is provided in the O-ring groove 126, so that the holder member 120 can be tightly coupled to the inside of the cylinder 110.

On the other hand, a tapered portion 123b inclined from the outside to the inside is provided on the outer peripheral surface on the rear side of the outer tube portion 123, and the tapered portion 123b pushes the outer tube portion 132 of the stopper member 130 in the horizontal direction . A detailed description will be given later.

The stopper member 130 is inserted between the outer tube portion 123 and the extension portion 122. The inner tube portion 131 is inserted into the stopper member 130, And is formed in the receiving groove 127.

5, the stopper member 130 is disposed on the rear side of the holder member 120 and has an outer peripheral surface of the stopper member 130 connected to the cylinder 110 to prevent the holder member 120 from being pushed rearward, As shown in Fig.

The stopper member 130 includes an inner cylinder 131, an outer cylinder 132, and a ring 133.

The inner tubular portion 131 extends vertically at the inner portion of the ring portion 133 and the outer tubular portion 132 extends vertically at the outer portion of the ring portion 133 and the inner tubular portion 131 is disposed at the center.

That is, the outer cylinder portion 132 is disposed to surround the outer circumferential surface of the inner cylinder portion 131, and the outer cylinder portion 132 is provided at the outer portion of the ring portion 133 at a predetermined distance from the inner cylinder portion 131.

The outer cylinder 132 allows the stopper member 130 to be firmly coupled to the cylinder 110 in a state where the stopper member 130 is coupled to the rear side of the holder member 120. More specifically, a protrusion 134 protrudes on a front outer periphery of the outer cylinder 132, and the protrusion 134 is fitted into a groove (111 in FIG. 7B) formed in the cylinder 110, So as not to be pushed to the rear of the cylinder 110.

The ring portion 133 is a ring shaped bottom surface of the outer tubular portion 132 and the inner tubular portion 131. The inner tubular portion 131 is provided on the inner side portion of the front surface of the ring portion 133, 132 are provided.

The rear surface of the ring portion 133 is a portion where the front surface of the gasket 142 of the piston 140 contacts when the piston 140 is moved forward. The bottom surface of the ring portion 133 is formed to correspond to the shape of the front surface of the gasket 142 so that the gasket 142 comes into close contact with the bottom surface of the ring portion 133.

On the other hand, a flow hole 135 communicating with the through hole 124 is formed in the center of the ring portion 133 and the inner cylinder portion 131. That is, when the inner cylinder portion 131 is inserted into the stopper member receiving groove 127 of the holder member 120, the extension portion 122 is inserted into the flow hole 135, (130) may be combined.

A second stopping protrusion 136 is formed on the rear side of the flow hole 135 so as to engage with the second hook portion 146 of the piston 140. A plurality of second stopping protrusions 136 are provided, (135). At this time, an insertion hole 137 through which the first and second hook portions 145 and 146 pass is formed at the center of the plurality of second latching jaws 136.

Further, the outer circumferential surface of the second stopping jaw 136 is formed so as to have a larger diameter from the front to the rear, and the diameter of the insertion hole 137 is formed to be constant from the front to the rear.

The first hook portion 145 and the second hook portion 146 can be elastically deformed by the plurality of the second hooking jaws 136 having such a configuration, As shown in FIG.

Since the diameter of the second hooking portion 136 is widened from the front to the rear and the diameter of the second hook portion 146 is also widened from the front to the rear, the front end of the second hooking jaw 136 The rear end of the second hook portion 146 having a large diameter is hooked, thereby preventing the second hook portion 146 from being released to the rear side of the second hook 136.

A plurality of second cuts 131a are formed in the inner tubular portion 131 of the stopper member 130 from the front end face to the rear end face and the outer tubular portion 132 is provided with a plurality of cut- Three incision portions 132a are formed. The second and third incisions 131a and 132a allow the inner tube 131 and the front end of the outer tube 132 to be resiliently deformed.

In addition, the inner circumferential surface of the outer cylinder portion 132 can be formed with an inclined inner inclined surface 132b inclined from the front to the rear, and the inner inclined surface 132b is inclined from the outside to the inside, And the holder member 120 and the stopper member 130 can be firmly coupled to the inside of the cylinder 110. [

More specifically, the inner inclined surface 132b of the outer tubular portion 132 of the stopper member 130 is in contact with the tapered portion 123b of the holder member 120, and the inner tubular portion 131 is inserted into the stopper member receiving groove 127 The holder member 120 is in close contact with the inner circumferential surface of the stopper member receiving groove 127 and the extended portion 122 so that when the holder member 120 is forced backward, The inner circumferential surface of the inner tubular portion 131 pushes the inner circumferential surface of the inner tubular portion 131 and the inner inclined surface 132b of the outer tubular portion 132 abuts against the force of the inner tubular portion 131 pushed by the extending portion 122, The tapered portion 123b of the tapered portion 123b receives a pushing force.

That is, when the holder member 120 is pushed rearward, the inner cylinder portion 131 pushes the tapered portion 123b of the holder member 120 in the horizontal direction by the extended portion, The inner inclined surface 132b of the outer cylinder 132 is subjected to a force that is pushed to the wall surface of the cylinder 110 by the force acting on the backward side and the force on the horizontal direction side.

As a result, the stopper member 130 is more strongly in contact with the wall surface of the cylinder 110, and as the holder member 120 is pressed harder, the stopper member 130 can be positioned more firmly.

The piston 140 may be disposed on the rear side of the cylinder 110 so as to discharge the injection liquid from the cylinder 110 to the outside or to inject the injection liquid from the outside into the cylinder 110. [ Quot;) < / RTI >

6A and 6B, the piston 140 includes a piston body 141 and a gasket 142. A shaft member 143 and a fastening member 144 are provided at the front end of the piston body 141 And the piston 140 is assembled with the gasket 142 by the shaft member 143 and the fastening member 144.

The fastening member 144 may protrude in the radial direction from the front of the piston body 141 and may have a plurality of fastening members 144 and may be spaced apart in the extending direction of the piston body 141.

The shaft member 143 extends from the front end of the fastening member 144 and has a first hook portion 145 that can be engaged with the first stopping jaw 128 of the through hole 124, And a second hook portion 146 that can be engaged with the hooking jaw 136.

That is, the first hook portion 145 may be formed on the front side outer peripheral portion of the shaft member 143, and the second hook portion 146 may be formed on the rear side outer peripheral portion of the shaft member 143. The second hook portion 146 may be formed on the outer peripheral portion of the shaft member 143 so as to contact the front surface of the gasket 142.

Meanwhile, the shaft member 143 may be provided on the front side of the fastening member 144 by extending to a predetermined length. More specifically, the predetermined length of the shaft member 143 is formed to be a length that can be inserted into the through-hole 124 of the columnar portion 121 so as to be discharged to the outside without remaining the injection liquid .

That is, the shaft member 143 may be formed to have a length that protrudes from the front end of the fastening member 144 to the front surface of the gasket 142 and can be inserted into the through hole 124 of the column 121, The hook portion 145 may be formed on the front side of the shaft member 143 that can be inserted into the through hole 235 and the second hook portion 146 may be formed on the front side of the shaft member 143, (Not shown).

The first hooking step 128a on which the first hook part 145 is hooked may be formed in the through hole 124 corresponding to the position of the first hook part 145.

The gasket 142 coupled to the piston body 141 by the fastening member 144 and the shaft member 143 is made of a flexible material and assembled to the front end portion of the piston 140 to be in close contact with the wall surface of the cylinder 110 The pressure can be applied to the injection liquid.

A method of operating the safety syringe 100 having such a configuration will be described below.

When the user pushes the piston 140 forward, the injection liquid which has flowed into the cylinder 110 is discharged to the outside through the through hole 124 of the holder member 120. At this time, the injection liquid may remain in the through hole 124 of the columnar portion 121 protruding forward of the cylinder 110 without being discharged to the outside.

The user then pushes the piston 140 a little further forward so that the shaft member 143 extending forwardly of the gasket 142 is inserted into the flow hole of the stopper member 130 and the through hole 124 of the holder member 120 . Therefore, the injection liquid remaining in the through hole 124 can escape to the outside by the shaft member 143 inserted into the through hole 124.

The safety syringe 100, which discharges the injection liquid to the outside, may introduce the injection needle into the cylinder 110 to prevent reuse.

7A, the safety syringe 100, which discharges the entire injection liquid, is in a state in which the piston 140 is positioned in front of the cylinder 110, and in particular, the gasket 142 is disposed in the rear of the stopper member 130 As shown in Fig.

When the piston 140 is pushed further forward with the gasket 142 being in close contact with the rear of the stopper member 130, the gasket 142 can not advance further but the piston body 141 is further advanced. At this time, as the piston body 141 advances, the shaft member 143 sequentially passes through the stopper member 130 and the holder member 120, so that the user can feel the pressure change by hand.

The first hook portion 145 passes through the flow hole 135 and passes through the first engaging step 128 in the through hole 124. When the piston body 141 moves to the maximum extent, Is inserted into the flow hole 135 of the stopper member 130 and is caught by the second stopping jaw 136.

When the piston 140 is moved backward, the state shown in Fig. 7B is obtained. That is, since the second hook portion 145 of the piston 140 is engaged with the second stopping jaw 136, the stopper member 130 is moved rearward of the cylinder 110 as the piston 140 is moved rearward .

Since the outer tubular portion 132 of the stopper member 130 can be easily elastically deformed by the plurality of third cutouts 132 so that the second hook portion 145 can be elastically deformed by the second hooking jaw 136, The projecting portion 134 is separated from the groove portion in the cylinder 110 and is moved rearward together with the piston 140. As a result, the stopper member 130 is moved rearward, Can be moved.

At this time, as the stopper member 130 and the piston 140 move backward, the first hook portion 145 positioned in the through hole 124 is moved to the first stopping protrusion 128 of the through hole 124 It gets caught. That is, the stopper member 130 and the piston 140 are moved by the distance d that the first hook portion 145 has moved rearward so that the first hook portion 145 is caught by the first stopping hook 128 . The stopper member 130 is moved backward by the moving distance d of the first hook portion 145 and is positioned on the rear side of the stopper member receiving groove 127. [

Finally, when the piston 140 is further retracted, the state shown in FIG. 7C is obtained. That is, the second hook portion 146 is hooked on the second hook 136 and the first hook portion 145 is hooked on the first hook 128, so that the holder member 120 And the stopper member 130 are all moved rearward along the piston 140. Then, when the cutting groove 147 of the piston 140 is seen outside the cylinder 110, it is cut and discarded.

Here, the safety syringe according to the present invention separates the piston member from the cylinder with a small force to move it to the rear of the holder member, and distributes the force to move the piston member and the holder member into the cylinder with a larger force, The force used to move the needle into the cylinder can move the needle into the cylinder with less force than in the prior art.

Further, since the shaft member on which the piston is formed is formed so as to extend to a certain length and inserted into the holder member, the injection member can be discharged to the outside without remaining the injection solution.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: safety syringe 110: cylinder
120: holder member 121:
122: extension part 123: outer part
124: through hole 125: space
126: O-ring groove 127: Stopper member receiving groove
128: first stopping jaw 130: stopper member
131: inner tubular portion 132: outer tubular portion
133: ring part 134:
135: flow hole 136: second stopping jaw
137: insertion hole 140: piston
141: piston body 142: gasket
143: shaft member 144: fastening member
145: first hook portion 146: second hook portion

Claims (11)

cylinder;
A holder member having a through hole through which the injection liquid flows into the interior through the injection needle, and a first latching protrusion formed on an inner circumferential surface of the through hole;
A stopper member having an inner tube formed with a flow hole communicating with the through hole at the center thereof and having a second stopping jaw formed in the inner surface of the flow hole, the inner tube being positionable at a rear of the holder member; And
A first hook portion formed on a front side outer peripheral portion of the shaft member and a second hook portion formed on a rear side outer peripheral portion of the shaft member, A piston capable of moving forward or backward in the interior of the cylinder,
The stopper member is formed so that the stopper member can be moved backward together with the piston in a state in which the second hook portion is caught by the second stopping member of the stopper member as the piston is moved backward, The stopper member and the holder member are formed so as to be movable rearward together with the piston when the stopper member is moved backward in a state where the stopper member is caught by the second stopping jaw and the first hook portion is caught by the first stopping jaw Safety syringe. The method according to claim 1,
The first hook portion is spaced apart from the first engaging jaw by a predetermined distance d and is located on the front side of the through hole when the piston is advanced to the cylinder front side so that the second hook portion is caught by the second engaging jaw,
When the piston is pulled backward, the first hook portion is pulled rearward to be caught by the first hooking jaw, and the stopper member is fixed to the stopper member receiving groove by a predetermined distance d ) To the back of the safety syringe. The method according to claim 1,
The holder member
A column portion having the through-hole formed at the center thereof;
An extending portion extending from the rear of the column portion to the stopper member side to be inserted into the flow hole so that the through hole communicates with the flow hole; And
And an outer tube portion spaced apart from the column portion and the extended portion so as to surround the column portion and the extended portion,
And a stopper member receiving groove is formed between the outer tube and the extension to fix the inner tube. The method of claim 3,
Wherein the first latching jaw is formed on an inner circumferential surface of the through-hole so as to have a larger diameter from the front to the rear. 5. The method of claim 4,
And a plurality of first incisions are formed in the first engaging jaw so as to be elastically deformed. The method according to claim 1,
The stopper member
An outer cylinder surrounding the outer surface of the inner cylinder and spaced apart from the inner cylinder; And
And a ring portion having a ring-shaped inner side portion provided with the inner cylinder portion and an outer side portion provided with the outer cylinder portion. The method according to claim 6,
And a protrusion inserted into a groove formed in the cylinder is formed on a front outer surface of the outer cylinder so that the holder member is not pushed toward the back of the cylinder. The method according to claim 6,
Wherein the inner circumferential surface of the outer cylinder portion has an inner inclined surface inclined from the front to the back. The method according to claim 6,
Wherein a plurality of second incisions are formed in the inner tube to elastically deform the inner tube, and a plurality of third incisions are formed in the outer tube such that the outer tube is elastically deformed. The method according to claim 1,
The piston
A piston body having the shaft member at a front side thereof, the piston body being inserted into the cylinder and moving along the cylinder; And
And a gasket coupled to the front of the piston body to be inserted into the cylinder closely. 11. The method of claim 10,
The shaft member extends a predetermined length so as to be spaced apart from the first hook portion and the second hook portion. The shaft member, which extends to a predetermined length, is inserted into the through hole, Safety syringe to discharge.

Images