JPH1057482A - Microsyringe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To evade a danger caused by exposing a scrapped injection needle by crashing the tip of the injection needle by inversely inserting a cut piston from the front part of a syringe. SOLUTION: Projections 11, 110 and 120 are provided respectively on the front part and rear part of the inner wall of this syringe, the projection at the front part among them is to fix the injection needle 5, and when the piston 20 is returned to the back after injection is performed, the piston 20 is cut off at the contact point of a rubber plug 22 and plastic. When the piston 20 is returned and brought to the projection point at the rear part of the syringe, it is stopped there and the piston is cut off. The cut piston is inserted inversely from the front part of the syringe and the injection needle 5 recovered in the syringe is bent and crashed. Further, the piston is provided with the projection part 202 on a middle position and the piston inversely housed inside the syringe is hooked by the projection 11 present at the front part of the inner wall of the syringe and fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a syringe for injection of a very small amount of a drug such as vaccination. This syringe is finished after injection, when the piston is returned, the injection needle stops at the protrusion at the rear, cuts at the cutting part, inserts the piston reversely from the front of the syringe, completely pushing and bending the injection needle. It has been done. Therefore, environmental pollution caused by the discarded syringe can be prevented.

[0002]

FIG. 1 shows a conventional micro syringe. As shown in the figure, a syringe used for injecting a small amount of drug (about 1 cc) has a very small diameter. Therefore, the mounting portion of the injection needle had to be attached to the syringe from the outside. Therefore, the used needle cannot be pulled back into the syringe, and the only option is to cover the cap, remove the needle, and discard the needle. Then, since the used needle is the same, if the cap is broken,
The needle tip is exposed or is re-used by a casual person, and this poses various risks.

FIG. 2 shows another type of conventional syringe. Since the mounting portion of the syringe needle is smaller than the bore of the syringe, the syringe needle returns into the syringe when the piston is returned after use. Then cut at the cutting point of the piston. In this syringe, the used needle is collected in the syringe, but the needle itself remains as it is. If the syringe breaks, the injection needle may be exposed. Moreover, when the injection needle is collected in the syringe, the syringe cannot be reduced in diameter. Then, the purpose of controlling a small amount of drug is lost. The cut piston is simply discarded and does nothing. In addition, since the syringe with the piston cut and the needle collected inside are not firmly fixed, if the adhesive force is lost, the needle will come out and the needle tip will hurt the person or cause infection. And risk of contamination.

[0004]

In view of this precedent, the inventor of the present invention, in order to achieve the required purpose of microinjection,
We think that the diameter of the syringe should be extremely small, and after use, the tip of the needle is always collected in the syringe, the mouth of the syringe can be sealed, and if the tip of the needle can be crushed at the same time, if the syringe is discarded, They concluded that there was no risk of harm or infection. Therefore, an object of the present invention is to insert a cut piston in the reverse direction from the front of the syringe, thereby crushing the tip of the injection needle and avoiding the danger caused by exposing the discarded injection needle. It is to provide a syringe.

[0005]

In order to achieve the above object, according to the present invention, the mounting portion of the injection needle is hooked on a projection at the rear portion of the inner wall of the syringe so that the mounting portion does not come off even when the injection needle is pushed again. Can be prevented. In addition, the cutting part of the piston is located at the connection point between the rubber stopper and the plastic, so that the plastic part remains intact after cutting, so that when the syringe is inserted backwards from the front of the syringe, the injection needle is completely Can be pressed and bent.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Here, the object, features,
The effects will be described in detail with reference to specific embodiments and the accompanying drawings.
FIG. 3 is a cross-sectional view showing a state before the vacant space of the injection needle mounting portion of the present invention is connected to the piston mounting portion. As shown in the figure, the front wall surface of the cylinder 10 of the syringe body is relatively thin and elastic. An indentation 41 in the mounting part 4 of the injection needle fits snugly into the first projection 11 on the inner wall of the syringe. The first projection 11 is
It serves to prevent the piston 20 from being pushed out too much during the injection, so that the mounting portion 4 of the injection needle does not escape. The upper part of the mounting portion 4 of the injection needle is connected to the injection needle, and the lower part is connected to the fixing stopper 24. The fixing plug 24 has, in the middle thereof, a slightly inclined equilateral triangular pyramid-shaped empty space 230 which is joined to the joint 23 of the piston. In the middle of the piston 20, a fixed projection 2
There is a disc 21 at the front of the piston 20 to prevent the two discs from shifting. The upper part of the disc 21 for preventing this displacement is a rubber stopper 22. A single thin rod is provided in the rubber stopper 22, and the tip of the rod is a connecting part 23. Is connected to the piston 20. The connecting portion between the thin rod without the rubber stopper 22 and the piston 20 is referred to as a cutting portion 201. 4 to 7 are diagrams for explaining the following situations. The injection is completed when the piston 20 is pushed forward and the connection part 23 is joined with the empty space 230 in the fixing plug 24 (FIG. 4). Thereafter, the piston 20 pulled back is collected in the barrel 10 of the syringe body together with the fixing stopper 24, the mounting portion 4 for the injection needle, and the injection needle 5. Injection needle 5 collected inside cylinder 10 of the syringe body
Since the empty room 230 is in a slightly inclined state, it is stored in the same inclined state. When the recess in the collected mounting portion 4 of the injection needle fits between the first projection 110 and the second projection 120 at the end of the barrel 10 of the syringe body, the cut portion 201 just comes out of the barrel 10 of the syringe body. (Fig. 5). Since the second protrusion 120 has a slightly acute angle, the mounting portion 4 of the syringe needle collected inside the barrel 10 of the syringe body never leaves the barrel 10 of the syringe body. At this time, the piston 20 is cut along the cutting point (FIG. 6). The cut piston 20 is inserted reversely from the front of the barrel 10 of the syringe body to crush the injection needle 5 (FIG. 7). Since the collected injection needle 5 is in a slightly inclined state, it is easy for the piston 20 to bend the injection needle 5.
Further, the disk 21 for preventing displacement at the tip of the piston 20 is doubled, and the piston 20 is connected to the injection needle 5.
Should the injection needle 5 penetrate the disc 21 for preventing the displacement of the first piece when bending the other piece, the other piece still stops. First protrusion 1 at the tip of barrel 10 of the syringe body
1 serves not only to prevent the mounting part 4 of the injection needle from being pushed out too much by the piston 20 at the time of injection, but also to prevent the piston 20 when the cut piston 20 is inserted backward from the front of the barrel 10 of the syringe body. The first protrusion 1 at the tip of the barrel 10 of the syringe body
1 to prevent the piston 20 from falling off. Thus, the discarded syringe is still intact and the danger is eliminated since the needle 5 has already been crushed.

[0007]

The micro-injector of the present invention has not only the function of a micro-injector but also the possibility that the tip of the injection needle may be completely crushed after use and the injector may be broken. The tip of the injection needle is not exposed,
It is safer than conventional syringes because it does not hurt people.

[Brief description of the drawings]

FIG. 1 is a front view of a conventional micro syringe.

FIG. 2 is a front view of another type of conventional microinjector.

FIG. 3 is a cross-sectional view showing a state before the joining portion of the present invention is joined to an empty room.

FIG. 4 is a cross-sectional view after the joining portion and the vacancy are joined.

FIG. 5 is a cross-sectional view showing a state where a mounting portion of the injection needle is recovered inside the syringe of the present invention.

FIG. 6 is a cross-sectional view showing a state in which a piston is cut after a mounting portion of the injection needle is recovered inside the syringe of the present invention.

FIG. 7 is a cross-sectional view showing a state in which the injection needle is bent and crushed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Syringe of syringe main body 11 First projection 110 Rear first projection 120 Rear second projection 20 Piston 201 Cutting section 202 Fixing projection 21 Disk for preventing displacement 22 Rubber stopper 23 Joining section 230 Vacancy 24 Fixing plug 4 Injection needle Attachment part 5 Injection needle

Claims (5)

[Claims] 1. A syringe having a front wall portion having a thinner wall, a projection on an inner wall surface at a tip end thereof, and two projections on an inner wall surface at a rear portion thereof, and a needle mounting portion. There is an injection needle with a fixed stopper that has an empty room, a projection to fix it in the middle position, a disk that prevents multiple displacement at the tip, and the top of the disk at the position of the disk that prevents the tip from coming off The rubber plug and its connection part have a piston at the cutting point, and the front and rear protrusion points on the inner wall of the syringe are the same as those in the front part. As the first protrusion, it plays the role of fixing the injection needle, there are also the first protrusion and the second protrusion on the back, when the piston is pushed forward and the connection point fits into the empty space inside the fixing stopper, When the injection is done and the piston is moved back The stopper is collected together with the injection needle into the syringe, and when the collected injection needle is inserted between the first projection point and the second projection point on the rear part of the inner wall of the syringe, the cutting point of the piston is just at the rear outlet of the syringe. There is to be cut there, the cut piston is immediately inserted backwards from the front of the syringe, the disc that prevents the double slip in front of the piston pushes and bends the injection needle, the piston A micro-syringe that has a locking projection in the middle of the syringe that catches on the projection at the tip of the inner wall of the syringe to prevent it from falling off. 2. The microinjector according to claim 1, wherein an upper portion is connected to the injection needle, and a lower portion has an injection needle mounting portion connected to a fixing stopper having a slightly inclined conical-shaped empty space. 3. A micro-injector according to claim 1, wherein said micro-syringe is provided in a rubber stopper on an upper part of a disc for preventing displacement, and has a connection part having a slightly inclined equilateral triangular conical shape. 4. The microinjector according to claim 1, further comprising a plurality of discs at a tip end of the piston for preventing a plurality of discs, wherein at least one disc, most ideally two discs, is provided. 5. The microinjector according to claim 1, further comprising a piston having at least one conical fixing projection in an intermediate position.