JPH0265870A - Preparation of stay needle - Google Patents

Abstract

PURPOSE:To enhance quality by easily processing a stay needle from the surface thereof by providing a hole punching male mold movable up and down in connection with and in matching relation to the position of the punched hole of a hole punching female mold in close contact with the inner diameter of an injection needle in a slidable manner and processing a horizontal slot being a punched hole to the injection needle at an arbitrary position. CONSTITUTION:A stay needle 1 having a horizontal slot 1c is prepared by a method wherein a hole punching male mold 2d movable up and down in connection with and in matching relation to the position of the punched hole 2c of the hole punching female mold 2b in close contact with the inner diameter of an injection needle 1 in a slidable manner is provided and the position of the horizontal slot 1c is selected at an arbitrary place of the stay needle 1 to form said slot 1c by both molds.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for manufacturing a blood vessel indwelling needle used in medical institutions.

[Background of the invention]

There are indwelling needles that are placed into blood vessels that have a horizontal hole at their cutting edge. When injecting a medicinal solution into a blood vessel through this side hole, a sufficient injection effect cannot be obtained by just injecting from the tip of the blade, so one or more side holes are provided in addition to the tip of the blade to obtain the effect of injecting the drug. . The processing of the horizontal hole described above is
Previously, a horizontal hole was formed from the cutting edge surface. That is, as shown in FIGS. 1 to 4, when forming a horizontal hole 1b on the back of the cutting edge 1a of the indwelling needle l, a male die 2 for punching hole and a female die 2a for punching hole are provided. After placing the indwelling needle 1 on the female mold and aligning the position with the punching hole 2C of the jlfE mold, he presses the male mold 2 and inserts the horizontal hole 1b, which is the punching hole, into the cough needle. Since it is formed from the inner wall, the processed part faces the surface of the cough needle, making it difficult to puncture smoothly.
It was not possible to machine horizontal holes in other locations than the horizontal hole 1b.

[Structure of the invention]

A male mold for a punching hole is provided that moves up and down in conjunction with the position of the punching hole of a female mold for a punching hole that is slidably in close contact with the inner diameter of the injection needle, and a horizontal hole that is a punching hole is provided at an arbitrary location of the injection needle. The structure is characterized by processing.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail with reference to FIGS. 5 to 7. The indwelling needle 1 with the side hole 1c formed therein (FIGS. 5 and 6 are cross-sectional views of FIG. 5) is designed so that the side hole 1c can be freely selected and processed into any opening of the indwelling needle 1. A male punching hole mold 2d is provided that moves up and down in alignment with the position of the bulge hole 2C of the female punching hole mold 2b that is slidably in close contact with the inner diameter (FIG. 7). The horizontal hole 1c can be obtained by selecting the position of the horizontal hole 1c at an arbitrary location.

〔Effect of the invention〕

In the previous method (Fig. 4), the horizontal hole 1b was machined from the direction of the cutting edge surface, so the machining hari was exposed on the needle surface,
Although it was not possible to machine a horizontal hole in any part other than the cutting edge 1a of the indwelling needle 1, with the structure of the present invention, as described above, it was possible to easily machine from the surface of the indwelling needle I, and the quality was sufficiently improved. It has effects such as being able to machine the horizontal hole 1c in any desired position.

[Brief explanation of the drawing]

FIG. 1 - A partial external view of a conventional indwelling needle without a horizontal hole. FIG. 2 - A partial external view of a conventional indwelling needle with a horizontal hole. FIG. 3 - A cross-sectional view of FIG. 2. FIG. 4--A partial cross-sectional view of a method of machining the horizontal hole of a conventional indwelling needle. Fifth
Figure - A partial external appearance diagram of an indwelling needle having a side hole formed by the method of the present invention. FIG. 6--A cross-sectional view of FIG. FIG. 7 - A partial cross-sectional view of the method of machining a horizontal hole according to the present invention. 1- Indwelling needle. 1a - Cutting edge surface. 1b - traditional side hole position,
Side hole. 1c - Position of the transverse hole according to the invention, transverse hole. 2-
Male mold for punching holes. 2a-Female mold for punching holes. 2b-Male die for punching hole 2d and female die for punching hole of series a1. 2cm punch hole. 2d - A male punching hole mold that is interlocked with the punching hole female mold 2b. that's all

Claims (1)

[Claims] A punching hole male mold is provided which moves up and down in conjunction with the position of the punching hole of the punching hole female mold which is slidably in close contact with the inner diameter of the injection needle, and a horizontal hole serving as a punching hole is formed at an arbitrary location of the injection needle. A method of manufacturing an indwelling needle characterized by processing.