JPS60220070A - Stay needle producing method and apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for continuously manufacturing indwelling needles used for medical purposes.

2. Description of the Related Art It is well known that indwelling needles have been used to inject or extract medical fluids, body fluids, etc. into the human body.

As a method for manufacturing this indwelling needle, for example, as shown in FIG. There is a method in which the plastic tubes 3 are moved in opposite directions to stretch the synthetic resin tube 1, and then the central portion is cut.

However, in such a method, only two products at maximum can be manufactured in one process, and setting the support member 2.3 takes time and effort, which is extremely inefficient.

In addition, in the product manufactured by this method, since the attachment ends 1a and lb of the support member 2.3 are formed into a cylindrical shape with the same diameter, for example, a standard Luer taper connector 4 as shown in FIG. When mounted, there is a problem in that it does not come into complete contact with the tapered portion 5. For this reason, generally the end portion 1a.

It is necessary to insert a tapered mold into 1b, heat it, and rework it to fit the tapered part 5 of the connector, which reduces production efficiency and increases costs.

Furthermore, as shown in Figure 2-a, in the above-mentioned product, since the distal end portion 1c is simply cut at a right angle, an extreme step is created between it and the outer peripheral surface of the inner needle 7, making it difficult to puncture. This can cause great pain to the patient. For this reason, in the past, it was necessary to shave off the distal end IC into a tapered shape.The present invention was proposed as a result of studies in view of the current situation, and the above-mentioned indwelling needle is made by extrusion molding. The purpose is to provide a continuous and efficient manufacturing method and apparatus.

Below, specific embodiments of the present invention will be described. First, FIG. 3 schematically shows the apparatus according to the present invention, and 10 in the figure
is an extrusion device. In this extrusion device, a flow path 11 for molten resin as a material is formed in a vertical direction, and a resin charging port 12 is provided in the second part, which branches off from the flow path 11, and is coaxial with the flow path 11. At the upper part, a charging port 13 for an inner mold 20, which will be described later, is provided.

Moreover, above the extrusion device 1O is a charging machine 14 for the inner mold 20.
is installed. This feeding machine 14 is configured by using a pair of rolls that can be opened and closed in the left and right directions to hold the inner mold 2.
0 may be input continuously or intermittently.

Furthermore, a roll 15 is disposed below the extrusion device 10 to hold down the inner mold 20 coming out of the extrusion device 20 and to apply a predetermined tension to the extruded resin. It is preferable that this roll 15 also has a mechanism that can be opened and closed in the left and right directions in accordance with the shape of the inner mold 20.

A cutting device 16 is disposed below the presser roll 15 to cut the molded resin adhered to the outside of the inner mold 20 at a predetermined position.

In the figure, reference numeral 17 denotes a cooling device, which is disposed in front of the presser roll 15 in this embodiment.

On the other hand, the inner mold 20 in the present invention is as shown in FIG.
It has a shape in which the central portion is bulged and small diameter portions 22 are provided on both sides thereof.

The inner fi 20 may be configured to be connectable to the tip of the small diameter portion of another inner mold at the tip connecting portion 23 of the small diameter portion 22, if necessary. In this case, if the connecting part 23 is made to easily come off when a certain amount of force is applied, then the inner mold 2
This is convenient when removing 0.

Further, the bulging portion 21 of the inner mold 20 has the same shape as the standard Luer taper part 5 (see FIG. 2).

Note that the inner mold 20 according to the present invention is not limited to that shown in FIG. 4; for example, as shown in FIG. In other words, it can be changed in accordance with the internal shape of the indwelling needle to be formed. Further, in order to make it easier to peel off the resin adhering to the inner mold 20, the surface of the inner mold 20 may be coated with a fluororesin, a silicone resin, or the like.

Next, to explain the method of manufacturing an indwelling needle θ using the above-described device, first, a thermoplastic synthetic resin 18 such as polyvinyl chloride resin or polyethylene resin is charged in a molten state from the resin charging port 12 of the extrusion device MIO. It is extruded along the flow path 11.

In addition, from the inner mold charging port 13, the inner mold 20 is loaded by a charging machine 14.
is charged toward the flow path 11. In this case, the inner mold 20 may be inserted continuously with the connecting portions 23 connected to each other, or may be inserted intermittently so that a predetermined interval is left between the connecting portions 23.

The inner mold 20 charged in this manner is coaxially extruded together with the molten resin 18, and is extracted from the extrusion device 10 with the resin 18 attached to the outer surface of the inner mold 20, and is moved downward. During this time, the resin 18 is molded along the shape of the inner mold 20, and the tension of the press roll 15 is also applied to mold the resin 18 to a predetermined thickness.

Next, the molten resin is cooled and solidified in the cooling device 17, and then
The cutting device 16 cuts a predetermined portion, that is, the central portion of the connecting portion 23 and the bulging portion 21 in the inner mold as shown in FIG. In this case, when the inner molds 20 are connected to each other, it is preferable that the connecting portions 23 come off when the inner molds 20 are pressed together with a predetermined pressure, for example, by the presser roll 15.

After the resin is cut in this way, the inner mold 20 is removed and removed.
This will be transferred to the sterilization process.

In the present invention, the inner mold 20 is heated in advance to a temperature slightly higher than that of the surrounding resin, or the surface of the inner mold 20 is coated with fluorocarbon resin or silicone, or a combination of heating and coating is performed before extrusion. The thickness of the molded product can also be adjusted by inserting it into the device 10 and sliding it slightly in the resin.

According to the present invention as described above, indwelling needles made of synthetic resin can be continuously manufactured by extrusion molding, and production efficiency is significantly improved compared to the conventional method.

Furthermore, according to the present invention, by making the bulging portion 21 of the inner mold 20 into a shape similar to that of a standard Luer taper, the obtained indwelling needle is also formed into a shape that allows the Luer taper to come into close contact with it, making it different from the conventional two-way needle. No further processing is required.

Moreover, according to the present invention, by adjusting the tension of the roll 15 and the heating temperature of the inner mold 20, the thickness can be controlled to any desired thickness.

Furthermore, according to the present invention, as shown in FIGS. 6 and 87 (FIG. 6 shows a case in which the inner mold is intermittently introduced, FIG. 7 shows a case in which the inner mold is continuously introduced and the connection part is separated immediately before cutting). case), the distal end of the resin 18 is molded into an R shape, so the distal end of the indwelling needle after being made into a product also has an R shape. therefore! ! As shown in Figure 88, the boundary between the inner needle 6 and the outer surface is gently sloped, so that the patient does not experience undue pain during puncture.
Various excellent effects can be obtained.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram for explaining a conventional method of manufacturing an indwelling needle, Fig. 2 is a schematic diagram showing a state in which a luer taper is connected to a conventional indwelling needle, and Fig. 2-a is a diagram of a conventional indwelling needle. FIG. 3 is a schematic diagram showing an embodiment of the present invention, FIG. 4 is a schematic diagram showing the inner mold of the present invention, and FIG. 5 is a schematic diagram showing the tips of the outer needle and the inner needle. A schematic diagram showing another embodiment of the present invention, FIGS. 6 and 7 are schematic diagrams showing the state of resin molding of the distal end of the inner mold in the present invention, and FIG. It is a schematic diagram showing the tip shape of a needle. In the figure, lO is an extrusion device, 11 is a molten resin passage, 12 is a resin charging port, 13 is an internal mold charging port, 14 is an internal mold charging machine, 15
1 is a presser roll, 16 is a cutting device, and 20 is an inner mold. Procedural Amendment (Usuban) 6 (ml, 2 ministries. Mr. Manabu Shiga, Director General of the Patent Office) 3 Person making the amendment 4 Representatives Address: 1-22 Nishi-Shinbashi, Minato-ku, Tokyo 105 No. 1 Amendment Contents 1, on page 4, lines 1 to 6 of the specification of the present application, the statement ``The extrusion device is provided with a Φ charging port 13 for the material.'' was replaced with ``Extrusion The extrusion device includes a die main body 10a, a male nozzle 10b, and a female nozzle 10c, and a molten resin charging port 12 is provided at the top.Inside the extrusion device 10, there is a molten resin flow path 11 in a vertical direction. A charging port 13 for an inner mold 20, which will be described later, is provided in the upper part coaxially with the flow path 11.A spiral-shaped molten resin flow path is formed on the outer periphery of the male nozzle 10b. is formed.It is corrected as J. 2. Figures 3 and 7 of the drawings attached to this application are corrected as shown in the attached sheet.

Claims (2)

[Claims] (1) A method for manufacturing an indwelling needle made of synthetic resin, in which an inner mold of the indwelling needle is coaxially inserted into a synthetic resin extruded in a molten state, and the resin is molded by the inner mold, and then the resin is molded. A method for manufacturing an indwelling needle, comprising cutting the molded resin at a predetermined position. (2) An apparatus for continuously manufacturing indwelling needles made of synthetic resin, which is equipped with a flow path for molten synthetic resin, and an inlet for inserting the inner mold of the indwelling needle coaxially with this wave path. An indwelling needle manufacturing device comprising: an extrusion device having an extrusion device; a device for continuously or intermittently charging an inner mold into the extrusion device; and a presser roll disposed below the extrusion device.