SU1178453A1 - Method of producing the head of reusable injection needle - Google Patents

Abstract

1. METHOD OF MANUFACTURING THE HEAD OF THE INJECTION NEEDLE OF THE MULTIPLE USE by forming a shoulder strap, a conical cavity and a conical part, characterized in that, in order to simplify the process, the head is made of a round section billet with a lug in the last section between the shoulder and the conical part of the area, the square is set with a sect and 2. Method POP1, characterized in that a cylindrical section is formed on the conical part. "9 3. Method POP.1, characterized in that the head is made by stamping.

Description

3 5

Figs / The invention relates to medicine, in particular, to methods for manufacturing an injection needle head, and can be used in the manufacture of a cannula for medical syringes, for example Record type syringes. The aim of the invention is to simplify the method of manufacturing the injection needle head. FIG. 1 shows the head of the injection needle, the main view; in fig. 2 - the same, left view) in FIG. 3 and 4 are similar projections of the proposed head with a cylindrical section on the body of rotation in FIG. 5 shows the initial blank; in FIG. 6 - the workpiece after the first punching operation; in fig. 7 shows the blank after performing the second punching operation, pa FIG. 8 shows the workpiece after performing the third punching operation in FIG. 9 is the same for a head with a cylindrical area on the body of rotation. The injection needle head has a square section 1, on which a cylindrical collar 2 is made, with the sides of the square inscribed in the circumference of the base of the collar 2. Section 1 by means of transitional chamfers 3, made on its ribs 4, is interfacing with the body of rotation having the shape of a truncated cone 5 or a cone 6, to a smaller base of which is adjacent a cylindrical section 7. A conical cavity 8 is filled in the body of the head to be put on a syringe, which communicates with hole 1 through 9 under the needle. The dimensions of the injection needle head described are selected in accordance with ratios of 0.2-0.4; 1 (-1G). -f- - and, on i, and, t ". -Odlin of the conical (and where is the cylindrical) body of rotation; length of the square section; length of the cylindrical part of the body of rotation; length of the conical part of the body of rotation; j; volume of the section of square section together with the shoulder; V is the volume of the body of rotation; V.J - the volume of the inner conical cavity; V - Vj is the volume of the body of a square section and a shoulder section minus the volume of the internal conical cavity. In the manufacture of the proposed injection needle head, from the round calibrated rod, for example, brass or aluminum, the initial billet 10 is cut off, the volume V of which is equal to the volume of the body of the head, plus the volume of the hole under the needle, i.e. V V + Vg. - Vj. After that, in the first punching operation, the workpiece 10 is placed in the die 11, and the punch 12 forms a recess 13 at one of its ends, and a chamfer 14 at the other end. In the second punching operation, a preform of the shoulder 2, section 1 square is made on the workpiece 10 sections, bodies of rotation 5 in the form of a truncated cone at the site of chamfer H and cavity 8 at the site of the recess 13. At the third final punching operation, the same elements of the head are finally formed, and the body of rotation takes the final shape 5 th cone (fig.V) or a truncated cone with 6 adjacent to its lower base of cylindrical portion 7 (Figure 9). After that, a through hole 9 is drilled or otherwise drilled into the workpiece, into which a needle is inserted during the subsequent assembly and the needle is pressed into the head by compressing the body of rotation. During the operation of the injection needle, the head is seized with a tool over a portion 1 of square section in front of the shoulder 2 and, resting against the shoulder 2, is put on the tip of the syringe. The advantage of the proposed injection needle head is that it does not slip out of the jaws of the instrument during the process of putting on a syringe and is easy to manufacture. Such a head shape can be obtained in the described manner from a cheaper round bar, in which the manufacture of the head is greatly simplified.

the process is easily automated, its productivity is increased and a sharp reduction in the number of equipment, production areas and maintenance personnel is provided. In addition, during punching, the metal is hardened, which increases the strength characteristics of the head and its durability, and the utilization rate of the source material of the workpiece reaches 0.950, 98. The proposed ratios of head sizes, determined experimentally, make it possible to provide the most optimal conditions for the flow of metal in the die and the process of stamping and to eliminate scrap during manufacture.

Along with this, due to the ratio of the lengths of the conical and square parts, the head, when placed on a plane, occupies the most stable position, which facilitates its gripping with a tool from a cuvette after sterilization by boiling it.

Rig. 3

FIG.

pus, 5

us. 7

FIG. eight

Claims (3)

1. METHOD FOR MANUFACTURING THE HEAD OF THE INJECTION NEEDLE OF REPEATED USE by forming a shoulder, a conical cavity and a conical part on the workpiece, characterized in that, in order to simplify the method, the head is made from a round workpiece with the formation of a square section between the shoulder and the conical part. 2. The method of pop. 1, characterized in that a cylindrical section is formed on the conical part. 3. The method of pop. 1, characterized in that the head is made by stamping. FIG. />