JPH0956819A - Injection needle for vein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to exactly prick a injection needle into the vein with lessened pain. SOLUTION: A pricking part 2 consisting of a front end 3, a bottom 4 and both side walls 5 is cut at a relatively small angle with respect to the central axis of a main body. The front end 3 is formed to have its bottom 4 with a needle shape. A groove 6 communicating with the inside of the main body 1 is enveloped by the bottom 4 and both side parts 5 exclusive of the upper part and is formed to converge toward the front end. The bricking part 2 is longer than heretofore and since the groove 6 is enveloped by the bottom 4 and both side walls 4, the needle is easily pricked exactly into the hard vein and lessens the pain. Since the aperture is larger than heretofore, the injection of an injection liquid, etc., and the removal of the blood are easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection needle that can be accurately inserted into a vein.

[0002]

2. Description of the Related Art A conventional injection needle is formed by cutting a puncture portion at the tip portion at a large angle with respect to the central axis of the injection needle. With such an injection needle, for example, in the case of renal dialysis, it is difficult to pierce into a hard vein, and the tip of the injection needle often deviates from the vein in an unskilled person. In addition, since the puncture portion is short, the opening area is small, and since a high-pressure injection solution is injected into the blood vessel, there is a drawback with pain.

In order to improve such a defect, the puncture portion of the injection needle is formed by cutting at a relatively small angle with respect to the central axis of the injection needle, and the tip of the puncture portion is bent gently toward the axial side. There are some (Japanese Patent Laid-Open No. 64-27551). However, even with such an injection needle, since the tip of the puncture part is curved, the direction of the injection needle is not fixed, so it is not possible to inject at the correct position. There was a shortcoming.

[0004]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to improve the drawbacks of the conventional injection needle so that the injection needle can be accurately inserted into the vein without any deviation, and the pain at the time of injection is small. To do so.

[0005]

In the intravenous injection needle of the present invention, a puncture portion composed of a tip portion, a bottom portion and both side walls is formed by cutting at a relatively small angle with respect to the central axis of the main body. At the same time, the tip portion is formed by making the bottom portion into a needle shape, and the groove communicating with the inside of the main body is wrapped by the bottom portion and both side walls except the upper portion, and is formed to be tapered toward the tip. is there.

[0006]

[Function] The puncture part is longer than the conventional one, and the groove communicating with the inside of the body is wrapped by the bottom part and both side walls and is sharp, so it is easy to puncture accurately without snarling into a hard vein, and there is less pain .

Since the opening formed in the puncture portion is larger than the conventional one, it becomes easy to inject an injection solution, a dialysate solution or the like and remove blood.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The overall description with reference to FIGS.
Is a body, which is cylindrical like a conventional injection needle. Reference numeral 2 denotes a puncture portion provided at a tip portion of the main body, which is composed of a tip portion 3, a bottom portion 4 and left and right side walls 5 which are integrally formed.

In this embodiment, the puncture portion 2 cuts the body 1 at a relatively small angle α with respect to the central axis L thereof, and the side walls 5 of the puncture portion 2 are directed toward the tip of the puncture portion 2. It is formed by tapering. Therefore, the planar shape of the outer shape of the puncture portion 2 is a substantially triangular shape. Although the above-mentioned α is about 10 ° in the embodiment, it is 5 ° to 3 °.
It can be arbitrarily selected within the range of 0 °.

The tip portion 3 is formed by forming the bottom portion 4 into a needle shape, and the cross section thereof is, as shown in FIGS. 3 and 4, from the circular shape near the tip to the main body 1 side. The shape is gradually elliptical.

Reference numeral 6 denotes a groove formed in the puncture portion 2, which communicates with the inside of the main body 1, and its cross section in the embodiment is, as shown in FIGS. Is. The shape of the groove 6 is not limited to that of the embodiment, and for example, the groove 6 may be formed in an arc shape (see FIG. 9) having an upper opening, an elliptical shape, or the like.

That is, the groove 6 is surrounded by the bottom portion 4 and both side walls 5 except for the upper portion, and the opening portion thereof has the tip portion 3
The width is gradually narrowed toward.

The upper ends of the side walls 5 may be cut into a flat surface, for example, as shown in FIG. 9, instead of being formed in a sharp blade shape as in the embodiment.

[0014]

EFFECTS OF THE INVENTION Since the puncture portion is cut at an angle smaller than the conventional one with respect to the axis of the injection needle, and the groove is surrounded by the bottom portion and both side walls to form a sharp shape as a whole, accurate and less pain is caused. Can be inserted into the vein with.

Further, since the opening portion of the puncture portion is formed larger than in the past, it is easy to inject an injection solution, a dialysate solution or the like and remove blood.

[Brief description of drawings]

FIG. 1 is a plan view.

FIG. 2 is a side view.

3 is an enlarged end view taken along line AA of FIG.

FIG. 4 is an enlarged end view taken along line BB of FIG.

5 is an enlarged end view taken along line CC of FIG.

FIG. 6 is an enlarged end view taken along line DD of FIG.

7 is an enlarged end view taken along line EE of FIG.

FIG. 8 is an enlarged end view taken along line FF of FIG.

FIG. 9 is an enlarged end view of a puncture part according to another embodiment.

[Explanation of symbols]

 1 Main body 2 Puncture part 3 Tip part 4 Bottom part 5 Side wall 6 Groove

Claims (1)

[Claims] 1. A puncture portion including a tip portion, a bottom portion, and both side walls is formed by cutting at a relatively small angle with respect to the central axis of the main body, and the tip portion is formed by making the bottom portion into a needle shape. An intravenous injection needle in which a groove communicating with the inside of the main body is wrapped around the bottom and both side walls except the top, and is tapered toward the tip.