JPH0360511B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a novel synthetic resin injection needle integrally formed entirely of synthetic resin, and an apparatus for manufacturing the same.

[Conventional technology]

Conventionally, this type of injection needle has a structure in which a hollow metal needle and a mounting body for attaching to a syringe are integrally fixed with adhesive, as shown in Fig. 8. It is being The attachment body is mass-produced by injection molding means such as synthetic resin, and the injection needle itself is so-called disposable and consumed each time it is used.

[Problem to be solved by the invention]

By the way, in the conventional example mentioned above, the structure is complicated,
Although it takes time and effort to manufacture, the problem is that it is expensive because it is disposable for each use.

[Means to solve the problem]

This invention was made with attention to the above points, and aims to obtain a new synthetic resin injection needle that is economical and low in cost even if it is disposable. A cap-shaped syringe needle prototype with an opening at one end is molded from thermoplastic synthetic resin, and while the opening of the prototype is closed with a valve mechanism, the conical part is locally heated and softened. By gripping the tip of the conical part and elongating it under reduced pressure, and keeping the volume of the hollow part of the original body constant, the part of the conical part near the cylindrical part is transformed into a constricted part, and then Following the constriction part, it is elongated and deformed into a thin hollow needle shape, and after cooling to form and solidify the final hollow needle part, the tip part is cut off to provide an opening for attaching an injection container. The method of manufacturing a synthetic resin injection needle is characterized in that a hollow needle part is connected to a cylindrical part, and further a cap-shaped syringe needle base having an opening at one end consisting of a cylindrical part and a conical part is provided. ShapeMolded from thermoplastic synthetic resin,
At the initial stage of the process of locally heating and softening the conical part of the cap-shaped syringe needle prototype, grasping the tip of the conical part and elongating it under reduced pressure until it deforms into a thin hollow needle shape, the opening is By closing the hollow part with a valve mechanism and keeping the volume of the hollow part constant, the part of the conical part close to the cylindrical part is transformed into a constricted part, and then the opening is opened to allow further expansion. Then, the part of the conical part that has been deformed into a constricted part is then deformed into a hollow needle shape, and is cooled to form the final hollow needle part and solidified.
A method for manufacturing a synthetic resin injection needle characterized in that the tip is cut off to obtain a hollow needle part connected to a cylindrical part provided with an opening for attaching a syringe, further comprising: A cap-shaped syringe needle prototype with an opening at one end consisting of a cylindrical part and a conical part is molded from thermoplastic synthetic resin, and while the conical part of the cap-shaped syringe needle prototype is locally heated and softened, the conical part is At the initial stage of the process of gripping the tip of the shaped part and elongating it under reduced pressure until it is deformed into a thin hollow needle shape, the opening is closed with a valve mechanism equipped with a suction and decompression function to reduce the volume of the hollow part. The portion of the conical portion close to the cylindrical portion is transformed into a lattice-shaped constricted portion, and then the suction depressurization of the valve mechanism is stopped to further expand the portion of the conical portion that is deformed into a truss-shaped constricted portion. Subsequently, the hollow needle is transformed into a hollow needle, and after cooling to form the final hollow needle and solidifying, the tip is cut off and connected to a cylindrical part provided with an opening for attaching a syringe. The present invention relates to a method for manufacturing a synthetic resin injection needle, characterized in that a hollow needle portion having a hollow needle portion is obtained.

The present invention also provides a support mold mechanism for supporting and fixing the cylindrical part of a thermoplastic synthetic resin cap-shaped hypodermic needle prototype having an opening at one end, which is composed of a cylindrical part and a conical part, and the support mold mechanism. on the bottom of
Consisting of an opening/closing movable mold mechanism that includes a built-in heater that can locally heat the conical part, a gripping mechanism that grips the tip of the conical part, and a valve mechanism that can open and close the opening of the cylindrical part. The present invention relates to an apparatus for manufacturing a synthetic resin injection needle, characterized in that the valve mechanism is further provided with a suction pressure reduction mechanism as required.

[Effect]

In advance, a synthetic resin cap-shaped syringe needle molded by an injection molding operation, etc., consisting of a cylindrical part and a conical part, is supported by a support mold mechanism, and then only the conical part is heated by the heater of the opening/closing mold mechanism. Heat partially to soften. Next, the tip of the conical part is gripped by a gripping mechanism and extended, but prior to this stretching operation, the opening of the original body is closed by a valve mechanism and extended. In this state, the volume of the hollow part of the original body does not substantially change due to the elongation operation, but in order to maintain a constant volume, the part of the conical part close to the cylindrical part deforms into a tapered part, and this part Subsequently, a hollow needle-like portion having a desired thickness can be formed by elongating it into an elongated hollow needle-like shape.

Moreover, even if the operation of closing the opening of the original body with the valve mechanism is limited to the initial stage of the elongation operation, the volume of the original body does not substantially change, and furthermore, the valve mechanism does not perform the suction depressurization operation. When the volume of the original body is reduced, the softened conical part constricts rapidly on the side closer to the cylindrical part, forming a constricted part, and the hollow part is reduced. The volume changes to a constant state or a state where the volume tends to decrease slightly.

The valve mechanism of the opening is then held in its position or released to allow the cone to extend further.
Following the tapered constriction part of the conical part, it expands into a hollow needle shape to form a hollow needle part with the desired final thickness.

Next, this elongated and solidified hollow needle-like part is cut diagonally to give a sharp tip structure, thereby obtaining a synthetic resin injection needle consisting of a hollow needle part continuously connected to the cylindrical part.

〔Example〕

A number of embodiments of this invention will be described below with reference to the drawings.

In each figure, reference numeral 1 denotes a cap-shaped syringe needle prototype made of thermoplastic synthetic resin such as polycarbonate, which is comprised of a cylindrical portion 2 and a conical portion 3, and has a hollow portion 5 with an opening 4 at one end. 6 is opening 4
It is a flange formed on the outer periphery of.

7 shows a support mold mechanism of the manufacturing apparatus A, in which a through-hole part 8 that can fixedly support the original form body 1 is bored, and the flange part 6 of the original form body 1 is locked in the locking groove 9 of the through-hole part 8. The structure is such that it can be suspended, and the cylindrical portion 2 of the original body 1 can be held. Reference numeral 10 indicates an opening/closing movable mold mechanism that is connected to the lower part of the support mold mechanism 7, in which heaters 11 are buried in the required number of stages, such as two or three stages, and are split into two in the center. It can be moved left and right to open and close the mold. Two conical holes 12 are bored in the inner surface of the two-split mold, which are positioned in a non-contact manner with a gap between the conical portions 3 of the original body 1. 13 is an air gap provided in the mold mechanism 10 with the heater 11 in between, and 14 is a temperature sensor for controlling the heater 11.

As shown in FIGS. 1 and 2, a large number of prototype bodies 1 are disposed in the support mold mechanism 7 and the movable open/close mold mechanism 10, and a large number of prototype bodies 1 are simultaneously heat-treated and operated. A through-hole portion 8 and a conical hole 12 are continuously bored so that the hole 8 and the conical hole 12 can be opened. Reference numeral 15 denotes a valve mechanism for controlling the opening and closing of the opening 4 of the original body 1, which controls the volume of the hollow portion 5 in the original body 1 with various functions and configurations as will be described later. It is designed to be useful for forming appropriate injection needles.

Reference numeral 16 indicates a gripping mechanism, in which a gripping portion 17 holds the original body 1.
The tip 3a of the conical portion 3 can be held and extended downward.

In the figure, reference numeral 18 is a cooling hole provided in the support mold mechanism 7 for passing cooling fluid, and serves to prevent the cylindrical portion 2 of the original mold body 1, which is suspended and supported, from being heated unnecessarily. exhibits.

The operation of the basic embodiment shown in FIGS. 1 and 2 will be explained based on the basic configuration described above.

A synthetic resin syringe needle prototype 1 previously molded using an injection molding device is suspended in the through hole 8 of the manufacturing device A as shown in the figure, and the opening 4 of the prototype needle 1 is connected to the valve mechanism 15.
The conical hole 13 is heated by causing the heater 11 of the movable open/close mold mechanism 10 to heat the conical hole 13, thereby locally heating the conical portion of the original mold body 1.

Further, the gripping mechanism 16 is configured such that the gripping part 17 grips the tip 3a of the conical part 3 of the original mold body 1, and the opening/closing mold mechanism 10 is opened outward as shown in FIG. Extend downward.

The conical part 3, which has already been sufficiently heated by the heater 11 and is in a softened state, is deformed as shown in FIG. 2 by the forced decompression lowering operation of the mold mechanism 16. The area close to the part 2 exhibits a reduced pressure state where the volume of the hollow part 5 does not change, so a constricted part P is formed in the form of a constriction, and a thin hollow needle-like part Q is deformed and formed following this constricted part P. Ru.

By the way, in this embodiment, since the valve mechanism 15 always closes the opening 4 of the original body 1, the volume of the hollow part 5 also remains unchanged in principle due to the pressure reduction effect even if the shape of the conical part 3 is deformed. In addition, as the downward extension of the gripping mechanism 16 increases, the thickness of the hollow needle-shaped part Q becomes smaller because the volume of the hollow part 5 is constant.

Moreover, an increase in the gripping extension amount of the gripping mechanism 16 means that the compositional arrangement of the resin in the softened conical part 3 is aligned and reinforced in a certain direction, and the resin structure is strengthened, so that the thin hollow needle-like part Q
This has the effect of further improving the function of the needle.

In this way, with the hollow needle-like part Q having the desired thickness obtained, the deformed drawn part P and the hollow needle-like part Q are solidified by heat radiation. Then, using a desired cutter, the hollow needle-like part Q is cut diagonally in a knife-edge shape to a desired length to form a needle tip R, thereby obtaining a final product S.

Regarding diagonal cutting with a cutter, in order to make the needle tip R sharper, a barrel-shaped polishing roller with a bulged center is used to form the cutting surface slightly inward. You can also.

Next, a second embodiment of the invention will be described with reference to FIGS. 5a to 5d.

The basic configuration of this embodiment is the same as that of the previous embodiment, so detailed explanation thereof will be omitted. The only difference from the previous embodiment is that the operation of the valve mechanism 15 is slightly different.

That is, in this embodiment, the holding mechanism 16 holds and stretches the tip 3a of the conical portion 3 under reduced pressure, and the valve mechanism 15 limits the opening 4 of the original body 1 to the first slight stretching period. After occlusion, the initial shape of the constricted part P and the hollow needle part Q is
At the time when P ₁ and Q ₁ are obtained, that is, at the time of FIG. 5 b, the valve mechanism 15 is opened and the states P ₂ and Q ₂ of FIG. 5 c are obtained.
The injection needle S is then deformed into a synthetic resin injection needle S, which is then subjected to atmospheric pressure elongation by the gripping mechanism 16, and then subjected to cooling solidification and cutting treatment in the same manner as in the previous embodiment to obtain the desired synthetic resin injection needle S. be able to.

Next, other embodiments of the present invention will be described with reference to FIGS. 6a to 6d.

This embodiment also differs from the first embodiment only in the structure and operation of the valve mechanism 15.

Therefore, detailed explanations of configurations similar to or equivalent to those of the embodiments described above will be omitted to avoid duplication.

In this embodiment, a valve mechanism 15 that always closes the opening 4 of the original mold body 1 is equipped with a suction depressurization function by making a through hole 15a, and the original mold body 1 is heated by the heater 11 of the movable mold mechanism 10. The air in the hollow part 5 is sucked to maintain a reduced pressure state until the conical part 3 of the body 1 is softened and deformed. [See Figure 6b] Therefore, the heated and softened conical part 3 forms a constricted part P1 that is sharply constricted near the cylindrical part 2, and then a narrow rod-like part _P1 . Thick pipe part
It forms Q ₁ .

In this state, the valve mechanism 15 closes its through hole 15a, the gripping mechanism 6 grips the tip 3a of the conical part 3 with its gripping part 17 [see FIG. 6c], and the opening/closing movable mold mechanism 10 and performing the elongation operation under reduced pressure as shown in FIG. 6d, the constricted portion P and the hollow needle-like portion Q can be formed very easily as in the first embodiment shown in FIG. By the treatment, the desired synthetic resin injection needle S similar to that described above can be obtained.

Another embodiment of the invention will be described with reference to FIGS. 7a, b and c.

This embodiment is basically the same as the embodiment shown in FIG. 6 above. The difference between the two is that in the valve mechanism 15 with a suction function, after the suction depressurization operation, the former substantially closes the through hole 15a to perform decompression expansion, whereas the latter, that is, this implementation In this example, the through hole 15a is simply opened to allow the expansion operation to be performed while being exposed to the atmosphere.

That is, Fig. 7 a and b of this embodiment are the same as a and b of Fig. 6, and Fig. 7 c of this embodiment is the same as Fig. 6 a and b.
are substantially the same as c and d in FIG.

Therefore, the synthetic resin injection needle S obtained in this example is not substantially different from those obtained in the previous examples.

Although a number of embodiments have been shown above, the present invention is not limited to the above-mentioned embodiments, and the present invention is not limited to the above-described embodiments. Supporting feature 1,
The structure of the means for heating, softening and elongating the conical portion 3 can be freely selected. The point is that if the constricted part P and the hollow needle part Q, which have a sharp shape that changes rapidly with respect to the cylindrical part 2, have a size and thickness that can be used practically as the desired injection needle,
It can be of any shape.

〔Effect of the invention〕

As mentioned above, this invention has completed the injection needle obtained by using the conventional combination of resin and metal needle and adhesive as a single product made only of synthetic resin, and the manufacturing method is also partial. Since it is an extremely simple method using heating and elongation and a pressure reducing means using a valve mechanism, it can be provided at low cost and with mass production, and in particular, it can provide an injection needle suitable for disposable use.

[Brief explanation of drawings]

1 and 2 are partially cutaway perspective views showing different manufacturing processes, respectively, showing one embodiment of the synthetic resin injection needle manufacturing apparatus according to the present invention, and FIG.
The figure is a vertical cross-sectional view of a semi-finished product obtained by the same device as above.
The figure is a vertical cross-sectional view of a finished product of a synthetic resin injection needle.
Figures a, b, c and d are longitudinal cross-sectional views showing different manufacturing steps of a manufacturing apparatus showing other embodiments of the present invention, and Figures 6a, b, c and d are further sectional views of a manufacturing apparatus according to another embodiment of the present invention. FIGS. 7A, 7B and 7C are vertical cross-sectional views showing different manufacturing processes of a manufacturing apparatus according to an embodiment of the present invention. FIG. 8 is a longitudinal sectional view of a conventional injection needle. DESCRIPTION OF SYMBOLS 1... A cap-shaped hypodermic needle prototype made of thermoplastic synthetic resin having a cylindrical part 2, a conical part 3, an opening 4 and a hollow part 5, 7... Support mold mechanism of manufacturing apparatus A, 10... Opening/closing Movable mold mechanism, 11... Heater, 15... Valve mechanism, 16... Gripping mechanism, P...
Squeezed part, Q...Hollow needle-like part, R...Needle tip, S
...Synthetic resin injection needle (final product).

Claims (1)

[Scope of Claims] 1. A cap-shaped syringe needle prototype body consisting of a cylindrical part and a conical part and having an opening at one end is molded from thermoplastic synthetic resin, and with the opening of the prototype body closed by a valve mechanism, While locally heating and softening the conical part, the tip of the conical part is gripped and stretched under reduced pressure, and the volume of the hollow part of the original body is kept constant, so that the conical part becomes close to the cylindrical part of the conical part. The individual part is deformed into a constricted part, and then elongated and deformed into a thin hollow needle following the constricted part, and after cooling to form the final hollow needle and solidify, the tip part is cut off. A method for manufacturing a synthetic resin injection needle, characterized in that a hollow needle part is cut out to obtain a hollow needle part connected to a cylindrical part provided with an opening for attaching an injection container. 2. A cap-shaped syringe needle prototype body having an opening at one end consisting of a cylindrical portion and a conical portion is molded from a thermoplastic synthetic resin, and while locally heating and softening the conical portion of the cap-shaped syringe needle prototype body, the above-mentioned At the initial stage of the process of gripping the tip of the conical part and elongating it under reduced pressure until it deforms into a thin hollow needle shape, the opening is closed with a valve mechanism to maintain a constant volume of the hollow part. A portion of the conical portion close to the cylindrical portion is transformed into a constricted portion in the shape of a truss, and then the opening portion is opened to further expand the portion of the conical portion that is close to the cylindrical portion. After deforming into a hollow needle shape and cooling to form the final hollow needle shape and solidifying, the hollow needle part is connected to a cylindrical part by cutting off the tip and having an opening for attaching an injection container. A method for manufacturing a synthetic resin injection needle, characterized in that the needle is made of synthetic resin. 3. Molding a cap-shaped syringe needle prototype with a cylindrical part and a conical part with an opening at one end from a thermoplastic synthetic resin, and locally heating and softening the conical part of the cap-shaped syringe needle prototype, while At the initial stage of the process of grasping the tip of the conical part and decompressing and elongating it until it deforms into a thin hollow needle shape, the opening is closed with a valve mechanism equipped with a suction decompression function to reduce the volume of the hollow part. By doing so, the part of the conical part close to the cylindrical part is transformed into a constricted part in the shape of a bulge, and then the suction depressurization of the valve mechanism is stopped and the part is further expanded.
The portion of the conical portion that has been deformed into a constricted portion is then deformed into a hollow needle shape, and after cooling to form the final hollow needle shape and solidifying, the tip portion is cut off and injected. A method for manufacturing a synthetic resin injection needle, characterized in that a hollow needle part is provided in series with a cylindrical part provided with an opening for attaching a container. 4. A support mold mechanism for supporting and fixing the cylindrical part of the thermoplastic synthetic resin cap-shaped syringe needle prototype body having an opening at one end consisting of a cylindrical part and a conical part, and a support mold mechanism on the underside of this support mold mechanism. , an opening/closing movable mold mechanism incorporating a heater that can locally heat the conical part, a gripping mechanism that grips the tip of the conical part, and a valve mechanism that can open and close the opening of the cylindrical part. An apparatus for manufacturing synthetic resin injection needles, characterized by: 5. The synthetic resin injection needle manufacturing apparatus according to claim 4, wherein the valve mechanism includes a suction pressure reduction mechanism.