JPH07121280B2 - Manufacturing method of indwelling needle - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for manufacturing a blood vessel indwelling needle used in a medical institution.

[Background of the Invention]

There is a shape of an indwelling needle that is placed in a blood vessel and a lateral hole is provided at the blade edge. When injecting a drug solution into a blood vessel, this lateral hole cannot obtain a sufficient injection effect only by injecting it from the cutting edge, so one or more lateral holes are provided in addition to the cutting edge to obtain the effect of injecting the drug solution. . In the processing of the lateral hole described above, the lateral hole was formed from the cutting edge surface before. That is, as shown in FIGS. 1 to 4, when the lateral hole 1b is formed in the back part of the surface of the cutting edge 1a of the indwelling needle 1, a male hole die 2 and a female hole die 2a are provided. , Indwelling needle 1 on the female mold
After aligning the punching position with the punching hole 2c of the female die, the male die 2 is pressed to form the lateral hole 1b which is the punching hole from the inner wall of the needle. Sticks out to the surface of the needle and the puncture is not smooth, or the side hole 1b
It was not possible to process side holes at other points.

[Structure of Invention]

A core metal rod-shaped female die for a punching hole that slidably comes into close contact with the inner diameter of an injection needle is inserted and placed, and a punching hole that vertically moves in line with the punching hole position of the female die in the pressing process. Such a male die is provided so as to be positioned, and a lateral hole which is a punch hole is machined from the back surface of the cutting edge portion at an arbitrary position of the injection needle.

Example of Invention

The indwelling needle 1 (FIG. 1) at the front stage for forming the lateral hole 1b is opened from the inside of the cutting edge surface 1a to form the conventional indwelling needle 1 (FIGS. 2 and 3 are side sectional views of FIG. 1). It The horizontal hole 1b is placed with the back side of the blade surface 1a of the indwelling needle 1 facing the female die 2a, and the male die 2 is press-fitted into the hole 2c of the female die 2a from the inside of the blade surface 1a by a pressing process. Then, punching is performed for punching (4th
Figure). An embodiment of the present invention will be described in detail with reference to FIGS. The indwelling needle 1 (FIG. 5 and FIG. 6 is a cross-sectional view of FIG. 5) having the lateral hole 1c is formed by freely providing the lateral hole 1c at a portion of the arbitrary cutting edge 1a of the indwelling needle 1 or at another position. . The side hole
A female metal mold in the shape of a core bar for a hole that slidably comes into close contact with the inner diameter of the injection needle 1 so that 1c can be washed at any position and processed.
Insert 2b. A punching hole male die 2d that moves up and down in conformity with the punching step 2c of the female die in the pressing process is provided on the back side of the cutting edge portion (Fig. 7), and a horizontal hole is formed at an arbitrary position of the indwelling needle 1. The male mold 2b is washed at the position of 1c to obtain a lateral hole 1c in a pressing process.

〔The invention's effect〕

In the conventional method (Fig. 4), the horizontal hole 1b
Since the machining burr was exposed on the surface of the needle, or the lateral hole was machined to any position other than the cutting edge 1a of the indwelling needle 1, the indwelling needle 1 could not be crushed by the male mold 2. As described above, according to the configuration of the present invention, it is possible to easily process the surface of the indwelling needle 1 to sufficiently improve the quality and to process the lateral hole 1c at an arbitrary position.

[Brief description of drawings]

FIG. 1 is a view of a partial external shape in the case where there is no lateral hole of a conventional indwelling needle. FIG. 2 is a partial external view showing a conventional indwelling needle having a lateral hole. FIG. 3 ... Sectional view of FIG. FIG. 4 is a partial cross-sectional view of a conventional method for processing a lateral hole of an indwelling needle. Fifth
FIG. 7 is a partial external shape diagram of an indwelling needle having a lateral hole by the method of the present invention. 6 ... Sectional view of FIG. FIG. 7: Partial cross-sectional view of the method for processing a lateral hole of the present invention. 1 ... Indwelling needle. 1a ... Blade surface. 1b: Conventional horizontal hole position, horizontal hole. 1c ... Position of lateral holes, lateral holes according to the present invention. Two
...... Male mold for punching holes. 2a: A core metal rod-shaped female die for punching holes. 2b …… Female hole die for interlocking with male hole die 2d.
2c ... hole. 2d: A male die for punching holes that interlocks with a cored bar female die 2b for punching holes.

Claims (1)

[Claims] 1. When forming a hole in a cutting edge portion of an injection needle, a female metal mold for a hole in the shape of a cored bar which slidably comes into close contact with the inner diameter of the injection needle is placed, and A female die is provided at the position of the hole of the injection needle so as to interlock with a male die for a punch hole, and the back surface of the tip of the injection needle is arranged toward the male die side, A method for manufacturing an indwelling needle, characterized by forming a lateral hole, which is a punched hole, at an arbitrary position on the back surface of the blade edge of the cutting edge.