JPH0332377B2 - - Google Patents

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 of 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, such a method is extremely inefficient, as only two products at most can be manufactured in one process, and setting the support members 2 and 3 takes time and effort.

In addition, in the product manufactured by this method, the attachment ends 1a and 1b of the support members 2 and 3 are formed into a cylindrical shape with the same diameter. When mounted, there is a problem in that it does not come into complete contact with the tapered portion 5. For this reason, it is generally necessary to insert a tapered mold into the ends 1a and 1b, heat them, and rework them to fit the tapered part 5 of the connector.
As a result, production efficiency decreases and costs increase.

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, the distal end 1c
It was necessary to cut the surface into a tapered shape.

The present invention was proposed as a result of studies in view of the current situation, and aims to provide a method and apparatus for manufacturing the indwelling needle continuously and efficiently by extrusion molding. be.

A specific embodiment of the present invention will be described below. First, FIG. 3 schematically shows an apparatus according to the present invention, and numeral 10 in the figure is an extrusion apparatus. This extrusion device includes a die main body 10a, a male nozzle 10b,
It consists of a female nozzle 10c, and a molten resin charging port 12 is provided at the top. Inside this extrusion device 10, a channel 11 for molten resin is formed in the vertical direction, and at the top, coaxially with the channel 11, is a charging port 13 for an inner mold 20, which will be described later.
is provided. Note that the male nozzle 10b
A spiral-shaped molten resin flow path is formed on the outer periphery of the tube.

Further, above the extrusion device 10, a charging device 14 for the inner mold 20 is disposed. The charging device 14 may be used to continuously or intermittently charge the inner mold 20 using a pair of rolls that can be opened and closed in the left and right directions, for example.

Furthermore, below the extrusion device 10,
A roll 15 is provided to hold down the inner die 20 coming out of the extrusion device 20 and to apply a predetermined tension to the extruded resin. This roll 15
It is also preferable that the mechanism is such that it 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, as shown in FIG. 4, the inner mold 20 according to the present invention has a bulged central portion, and small diameter portions 2 on both sides thereof.
It has a shape with 2.

This inner diameter 20 may be configured so that it can be connected 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, the connecting part 2
It is convenient to remove the inner mold 20 later if the inner mold 20 is to be easily removed when a certain amount of force is applied to the inner mold 3.

Further, one half of the bulging portion 21 of the inner mold 20 has the same shape as the Luer tapered portion 5 of the standard product (see FIG. 2).

Note that the inner mold 20 in the present invention is not limited to that shown in FIG.
As shown in the figure, the shape may be such that the bulging portion 21 is divided from the center into two equal parts, and in short, the shape can be changed depending on the internal shape of the indwelling needle to be formed. Furthermore, 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 fluorine-based resin, silicone resin, or the like.

Next, to explain the method of manufacturing an indwelling needle using the above-described device, first, the resin charging port 1 of the extrusion device 10 is
2, a thermoplastic synthetic resin 18 such as polyvinyl chloride resin or polyethylene resin is charged in a molten state and extruded along the flow path 11.

Further, from the inner mold charging port 13, the inner mold 20 is charged toward the flow path 11 by a charging machine 14. 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 way is filled with the molten resin 1.
The resin 18 is extruded coaxially with the inner die 20, and is extracted from the extrusion device 10 with the resin 18 attached to the outer surface of the inner die 20, and descends downward. During this time, the resin 18 is molded along the shape of the inner mold 20, and the tension of the presser 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 cut into a predetermined location by the cutting device 16, that is, in the case of the inner mold, as shown in FIG. section is cut. 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 has been cut in this way, the inner mold 20 is removed and the mold is moved to a 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 a fluorine-based resin or silicone, or a combination of heating and coating is performed, and then extrusion is performed. 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, synthetic resin indwelling needles 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, unlike 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 7 (in FIG. 6, the inner mold is inserted intermittently, and in FIG. 7, the inner mold is inserted continuously, and the connecting part is separated immediately before cutting). Since the distal end of the resin 18 is molded into an R shape, the distal end of the indwelling needle after being made into a product also has an R shape. Therefore, as shown in FIG. 8, the boundary between the inner needle 6 and the outer surface forms a gentle slope, which prevents undue pain from being caused to the patient during puncture.
Various excellent effects can be obtained.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram for explaining the conventional method of manufacturing an indwelling needle, Figure 2 is a schematic diagram showing a state in which a Luer taper is connected to a conventional indwelling needle, and Figure 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. FIGS. 6 and 7 are schematic diagrams showing other embodiments of the present invention, and FIG. 8 is a schematic diagram showing the state of resin molding of the tip of the inner mold according to the present invention. It is a schematic diagram showing the tip shape of the indwelling needle. In the figure, 10 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 is a presser roll, 16 is a cutting device,
20 is an inner mold.

Claims (1)

[Scope of Claims] 1. A method for manufacturing an indwelling needle made of synthetic resin, which comprises: inserting an indwelling needle inner mold coaxial with the tubular channel through which molten synthetic resin flows; ,
Then, by loading the molten synthetic resin into the tubular channel and extruding the indwelling needle inner mold and this resin from the outlet of the tubular channel, a molded resin that will become the base material of the indwelling needle is molded, and then the molding A method for manufacturing an indwelling needle, which comprises cutting a resin at a predetermined position. 2. An apparatus for continuously manufacturing indwelling needles made of synthetic resin, which has a tubular flow path for molten synthetic resin, and a device for inserting the inner mold of the indwelling needle coaxially with this flow path. an inlet and an outlet for extruding the resin together with the inner mold;
an extrusion device having a molten resin inlet communicating with the tubular flow path; an indwelling needle inner mold inserted into the extrusion device for molding a raw material for an indwelling needle; and an indwelling needle inner mold inserted into the extrusion device. A device for continuously or intermittently charging; a pressure roll for the indwelling needle inner mold disposed below the extrusion device; and a cutting device for cutting the molded resin extruded from the extrusion device at a predetermined position. An indwelling needle manufacturing device comprising: