JPH0197473A - Tubular member and tubular member assembly - Google Patents

Abstract

PURPOSE:To strongly bond the first and second tubular members, by inserting the second relatively soft tubular member in the annular gap formed between a male mold part and a female mold part provided coaxially and closely bonding the same to the first tubular member composed of relatively hard plastic. CONSTITUTION:A hub 13 composed of relatively hard plastic is equipped with a male mold taper part 13A and the forwardly expanding female mold taper part 13B coaxially provided to the outer periphery of the hub 13 so as to provide a predetermined interval. A tube 16 composed of relatively soft plastic is inserted in the annular gap formed between the male mold taper part 13A and female mold taper part 13B of the hub 13 to be closely bonded to the hub 13. That is, the inner diameter part 16A bonded so as to be enlarged in its diameter by the male mold taper part 13A and the outer diameter part 16B bonded so as to be contracted in its diameter by the female mold taper part 13B are provided to the connection part of the tube 16. By this method, both members are strongly bonded without using an adhesive such as a solvent and high liquid tightness can be secured in the connection part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tubular member and a tubular member assembly suitable for use in medical devices.

[Prior Art] Conventionally, as a medical device, a first tubular member such as a hub made of relatively hard plastic with which a puncture needle etc. is communicated, and a relatively soft plastic material with which an infusion container etc. are communicated. A second tubular member, such as a tube, is connected in a state where they communicate with each other.

[Problems to be Solved by the Invention] By the way, in the above-mentioned conventional medical device, when the medical device is handled, a tensile force is generated in a direction that separates the first tubular member and the second tubular member from each other. or conversely, a pushing force tends to act in a direction that pushes the first tubular member and the second tubular member into each other.

At this time, if the first tubular member and the second tubular member move (displace) relative to each other at their joints due to the action of the above-mentioned pulling force or pushing force, separation may occur at their joints, etc. This will reduce the bond strength. This is not appropriate as it impairs the reliability and safety of the medical device.

An object of the present invention is to firmly connect a tubular member made of relatively hard plastic and a tubular member made of relatively soft plastic.

[Means for Solving the Problems] The tubular member of the present invention is a tubular member made of relatively hard plastic, and the tubular member includes a tubular male portion;
A female mold part is coaxially provided on the outer periphery of the male mold part at a predetermined interval, and a relatively soft plastic is filled in an annular gap formed between the male mold part and the female mold part. It is designed to be used for inserting and closely adhering another tubular member made of.

The tubular member assembly of the present invention includes a first tubular member made of a relatively hard plastic and a second tubular member made of a relatively soft plastic, the first tubular member being a tubular male member. It consists of a mold part and a female mold part coaxially provided at a predetermined interval on the outer periphery of the male mold part, and the annular gap formed between the male mold part and the female mold part is A second tubular member is inserted and brought into close contact with the first tubular member.

[Operation] According to the tubular member and the tubular member assembly of the present invention, when a tensile force is applied in the direction of separating the first tubular member and the second tubular member from each other, the soft second tubular member The inner diameter portion of the first tubular member is reduced in diameter and is brought into closer contact with the male portion of the first hard tubular member to be firmly coupled. Furthermore, when a pushing force is applied in the direction of pushing the first tubular member and the second tubular member into each other, the outer diameter of the soft second tubular member expands and becomes the hard first tubular member. The female part of the member will come into close contact and be firmly connected. In other words, even if either a tensile force or a pushing force is applied to the first tubular member and the second tubular member, the joint between the two does not cause peeling due to relative movement (displacement), but rather the state of close contact between the two is improved. to further improve the bonding strength between the two.

[Example] Fig. 1 is a schematic diagram showing an embodiment of the present invention, Fig. 2 is a cross-sectional view showing the tubular member in a state before being combined, and Fig. 3 is a cross-sectional view showing the joined state of the tubular member in an enlarged manner. It is.

The medical device (tubular member assembly) according to this embodiment has a hollow needle 11 and a container 12. The hollow needle 11 is fixed to a hub 13 as a first tubular member with an adhesive 14, and a protector 15 can be fitted onto and removed from the hub 13. The container 12 is made of flexible plastic, stores a liquid such as a medicinal solution or an anticoagulant aqueous solution, and can be used as an infusion container or an m-method container. The container 12 has a tube 1 as a second tubular member.
6 are connected.

The hub 13 and tube 16 are connected to each other so as to communicate with each other under the following structure.

That is, the hub 13 is made of relatively hard plastic, and the tube 16 is made of relatively soft plastic.

Here, the hub 13 has a tapered male taper part (tubular male part) 13A, and a female taper part (tubular male part) with a tapered end that is coaxially provided at a predetermined interval on the outer periphery of the hub 13. female part) 13B. The tube 16 is inserted into an annular gap formed between the male taper part 13A and the female taper part 13B of the hub 13, and is in close contact with the hub 13. That is, at the joint part of the tube 16,
An inner diameter part 16A whose diameter is enlarged by the male taper @13A and joins together, and an outer diameter part 16B whose diameter is reduced and joined by the female taper part 13B are provided.

The male taper portion 13A of the hub 13 and the inner diameter portion 16A of the tube 16, the female taper portion 13B of the hub 13, and the outer diameter portion 16B of the tube 16 are more preferably made liquid-tight by blocking by a manufacturing method described later. are hermetically connected. The materials of the hub 13 and tube 16 must be combined so that they block each other, and for example, a combination of vinyl chloride or vinyl chloride and polycarbonate is used.

Next, a method for manufacturing the medical device according to the above embodiment will be explained.

First, in the puncture needle assembly process, the hollow needle 11 is attached to the hub 13.
After implantation, the hub 13 is covered with the protector 15. On the other hand, in the step of injecting the drug into the container 12, a fixed amount of the drug is injected into the container 12 from the opening at the tip of the tube 16 connected to the container 12. From the state shown in FIG. The inner diameter part 16A is pushed into the female tapered part 13B of the hub 13 while the outer diameter part 16B of the tube 16 is reduced in diameter, and the two are brought into close contact with each other as shown in FIG.

Next, the hollow needle 11. The entire medical device consisting of the container 12, hub 13, and tube 16 is sterilized by autoclaving. During sterilization using the autoclave, the joint between the hub 13 and the tube 16 is heated within a temperature range lower than the melting point of the constituent materials of the hub 13 and the tube 16 to cause blocking and to form an airtight joint. The heating means for causing blocking is not limited to an autoclave, but may also include a heater, internal heat generation by high frequency, hot water,
It may also be dried, left in a high temperature room, etc. The joint between the hub 13 and the tube 16 that has been blocked in this way is then cooled to room temperature.

According to the above embodiment, the hub 13 and the tube 16 are connected by blocking adhesive, so that the two are firmly connected without using adhesive such as a solvent, and high liquid tightness is ensured at the joint. becomes possible. Further, the solvent used as the adhesive and the like will not be eluted into the chemical solution.

Furthermore, even if a chemical solution comes into contact with the joint between the two, the joint strength will not decrease because no adhesive is used. Furthermore, in addition to cases in which the bonding strength is reduced due to damage to the adhesive by chemical solutions, products that use adhesives during bonding are often unable to form strong bonds due to the presence of liquids such as chemical solutions adhering to the joints. , the above-mentioned problems cannot occur in blocking adhesives that do not use adhesives.

Further, since the hub 13 is made of relatively hard plastic and the tube 16 is made of relatively soft plastic, the tube 16 is made of relatively hard plastic.
3, it is possible to reliably bring them into close contact and obtain a strong blocking state.

Further, when a tensile force is applied in a direction to separate the hub 13 and the tube 16 from each other, the inner diameter portion 16A of the soft tube 16 is reduced in diameter, and the male taper portion 13A of the hard hub 13 is reduced in diameter.
This results in a tighter bond and a stronger bond. Further, when a pushing force is applied in the direction of pushing the hub 13 and the tube 16 into each other, the outer diameter portion 16B of the soft tube 16 is reduced in diameter and tightly adheres to the female tapered portion 13B of the hard hub 13, thereby making it stronger. It will be combined with. In other words, even if either a tensile force or a pushing force is applied to the hub 13 and the tube 16, the joint between the two will not peel off due to relative movement (displacement), but will further increase the adhesion between the two and increase the joint strength between the two. further improve.

[Effects of the Invention] As described above, according to the present invention, a tubular member made of relatively hard plastic and a tubular member made of relatively soft plastic can be firmly connected.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the tubular members in a state before they are joined, and FIG. 3 is an enlarged cross-sectional view showing the joined state of the tubular members. 13... Hub (first tubular member), 13A... Male taper part (tubular male part), 13B...
... Female taper part (tubular female part), 16... Tube (second tubular member), 16A... Inner diameter part, 16B... Outer diameter part.

Claims (2)

[Claims] (1) A tubular member made of relatively hard plastic, the tubular member comprising a tubular male part and a female part coaxially provided at a predetermined interval around the outer circumference of the male part. and is used for inserting another tubular member made of relatively soft plastic into the annular gap formed between the male mold part and the female mold part and bringing them into close contact. A tubular member. (2) A first tubular member made of relatively hard plastic and a second tubular member made of relatively soft plastic, the first tubular member including a tubular male part and the male part. and a female mold part coaxially provided at a predetermined interval on the outer periphery of the mold part, and the second tubular member is placed in an annular gap formed between the male mold part and the female mold part. A tubular member assembly, which is inserted into the tubular member assembly and is in close contact with the first tubular member.