Method of manufacturing injection needle and injection needle

Abstract

The invention relates to the manufacture of injection needle, which is aimed to simply obtain an injection needle which dispenses with jointing treatment when a cylindrical shape with a small diameter is made, and enables the smooth flow of a liquid to be ensured without polishing treatment of an inner wall surface. Firstly, a master for the injection needle is made (S1); secondly, a master retaining holder is fitted with the master for the injection needle (S2); subsequently, an electroformed metal adheres to the master for the injection needle by electroforming treatment (S3); and finally, the master for the injection needle is pulled up from an electroforming tank along with the master retaining holder, so that an electroformed body as an injection needle body can be released from the master for the injection needle (S4). In the manufactured injection needle, an outside diameter of a leading end for a puncture is set on the order of 0.12 mm; and a tapered part, the outside and inside diameters of which are reduced toward the leading end, is arranged between a proximal end part and the distal end part for the puncture. The invention simplifies the manufacture of injection needle, and enables the smooth flow of a liquid in the injection needle, further, greatly reduces the pain in puncture.

Description

technical field [0001] The present invention relates to a method of manufacturing injection needles used for injecting liquids such as medicinal liquid into the body, and products related to injection needles manufactured thereby, and particularly relates to ultra-fine injection needles with a tip diameter of about 0.25 mm or less, for example. Methods of manufacture and articles related to injectable needles. Background technique [0002] Generally, when the outer diameter of the injection needle is about 0.3mm to 2.0mm, it is relatively thin. The injection needles used for insulin self-injection and dental anesthesia are all injection needles with an outer diameter of about 0.2mm or more. The pain during injection is related to the thickness of the injection needle, and it is generally believed that the thinner the needle, the less pain it will cause. In particular, the outer diameter of the needle used for self-injection can be reduced to reduce anxiety and fear of the p...

AI Technical Summary

Problems solved by technology

[0004] But above-mentioned prior art all is the method from rolling the flat stainless steel material into a circle to make a cylinder, to the mutual welding of the end faces of the roll circle butt joints, etc., so all need the processing of joining, no matter what will happen. Creates poor flow of fluid at the seams of this joint

In addition, due to the addition of complicated processes such as rolling and joining of flat stainless steel, the time and cost of manufacturing will increase.

[0005] In addition, as a manufacturing technique for metal thin-diameter pipes such as stainless steel materials, a method of drawing a large-diameter metal steel pipe to make the diameter smaller is also known. However, after such a drawing process is performed on the metal steel pipe, The inner wall will have fine wrinkles, and if the inner wall is not ground, it will be difficult to ensure the smooth flow of liquid, so it will be difficult to use this method to manufacture injection needles in practice

Moreover, when carrying out such stretching processing, machine oil must be used in the manufacturing process, and when it is applied to injection needles, it must be fully degreased, which makes the manufacturing process more cumbersome

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