JPH0242511B2 - - Google Patents

Description

Detailed Description of the Invention Background of the Invention <Technical Field> The present invention relates to a pipe body equipped with a separable plug body, and particularly to a pipe body having a separable plug body that will not be damaged or contaminated until immediately before use. The present invention relates to a tube body which is equipped with a plug body and whose plug body can be easily separated and manipulated.

<Prior Art> Some branch pipes, such as four-way branch pipes, used in blood bags and the like are generally used one after the other, rather than using a plurality of branch pipes at the same time. In this case, the unused branch pipe must be completely sealed with a stopper or the like to prevent the flow path from being contaminated by the unused branch pipe. Next, when using the branch pipe, it is necessary to easily break and remove the stopper to open the branch pipe and connect it to another member such as a bottle needle.

For this reason, conventionally 4 with a plug body that can be broken and separated
A bifurcated pipe has been proposed. This is equipped with a breakable and separable plug that covers the opening of the tube, and the tube can be easily opened by folding or threading the breakable and separable plug. It is something that can be done.

However, this breakable and separable plug body is difficult to attach for thread cutting.Therefore, attempts have been made to make part of the plug body a thin-walled fragile part to facilitate thread cutting operations; Even if there are parts, they may be made of the same material,
After all, the operation of cutting the threads may be difficult,
Further improvements are desired.

In addition, when manufacturing the plug body as a separate component from the tube body, a thin-walled fragile portion must be provided, which requires precision machining, resulting in a time-consuming process.

Purpose of the Invention The purpose of the present invention is to improve the above-mentioned problems with separable plugs in pipes such as four-way branch pipes with separable plugs, and It is an object of the present invention to provide a tube body having a separable plug body that protects the opening and which can be easily separated by grasping and bending when the opening of the tube body is exposed during use.

Structure of the Invention In order to achieve the above object, the present invention comprises a tube having at least two openings, a material incompatible with the tube, a closed end, and a predetermined opening of the tube. A stopper is joined to the opening on the opposite side of the closed end, and the joint between the tube and the stopper is formed by fine particles existing on the joint surface of at least one of the tube and the stopper. Separation characterized in that the pipe body and the plug body are joined together with the material of the other joint surface entering into a large number of uneven parts, and the joint strength is such that the pipe body and the plug body can be separated from the joint part. To provide a tube body with a possible plug body.

Here, it is preferable that the plug body and the tube body are integrally molded by a two-color molding method and have a separable plug body.

Further, it is preferable that the tubular body is provided with a separable plug whose outer wall has a cross-sectional shape other than a perfect circle.

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, preferred embodiments of the present invention shown in the drawings will be described in detail.

The tube of the present invention may be of any type as long as it has at least two openings, but in the following description, a generally widely used four-way branch tube will be used as a representative example.

FIG. 1 shows one embodiment of the tube body of the present invention, and the third
It is an enlarged view of the circular part shown by the dotted line in figure a, and is a partial cross-sectional plan view of the four-way branch pipe. In FIG. 1, for example, the first opening 11 is a blood sampling needle 24 (see FIG. 3a).
In addition, the second opening 12 is connected to the first blood bag 20 (third a).
(see figure), the third opening 13 is connected to the second blood bag 21.
(See Fig. 3a) A pipe body 1 is a four-way branch pipe, and a plug body 2 is delivered to the fourth opening 14.
It shows.

The plug body 2 has a closed end 8 at one end. The end of the plug body 2 opposite the closed end 8 is connected to the open end 6 of the fourth opening 4 of the tube body 1 . The plug body 2 and the tube body 1 may be joined with approximately the same outer diameter, or the plug body 2
The end opposite to the closed end 8 may be connected to the enlarged outer diameter portion of the tubular body 1 shown in FIG. 1 as an open end. The joint surfaces of the tube opening end 6 and the plug opening end 7 are joined with the material of the other joint surface entering into the many fine irregularities present on at least one surface, but when the plug body 2 is used, When bending and separating the plug body 2 from the open end 6 of the tube body, the bonding strength is such that a worker can separate it by hand. In order to achieve this kind of bonding strength, it is important to select the materials that make up the tube body 1 and the plug body 2. By using different types of resins that include some homogeneous resins, we have experimentally determined that there is a sufficient balance between bonding and peeling. Choose as much as possible. Further, the size of the unevenness of the large number of minute unevenness portions present on at least one surface is preferably about 1 to 200 μm.

The tube body 1 and the plug body 2 are each made of incompatible resins, and are most preferably formed by the two-color molding method described below. If compatible resins are used, the bonding strength will be too high, making peeling and separation difficult.

The boundary surface 9 that is the boundary between the tube body 1 and the plug body 2 is configured such that by simply bending the latter with respect to the former, the latter can be easily separated from the former by peeling or the like at the boundary surface 9. For this purpose, both parts are preferably made of different resins, and in particular, the tube body 1 is preferably made of a soft resin, and the plug body 2 is made of a hard resin. Soft resins include PVC resin, vinyl acetate resin, thermoplastic urethane resin, etc. Hard resins include polypropylene resin, polyethylene resin, nylon resin, etc.
Polyacetal resin, polyester elastomer resin, styrene-butadiene-styrene copolymer resin, etc. can be used.

It is preferable that the cross-sectional shape of the outer wall of the plug body 2 is other than a perfect circle on the distal side of the closed end 8.

The cross section of the inner wall of the plug body 2 that comes into close contact with the open end 6 of the tube body 1 is approximately a perfect circle with an inner diameter that is approximately the same as the outer diameter of the open end 6, but other than this, at least the closed end of the plug body 2 The cross-sectional shape of the outer wall on the distal side from 8 is preferably a shape other than a perfect circle that is easy to grasp.

Further, it is preferable that a resistance imparting member such as a rib 15 be formed on the outer wall of the plug body 2 so as to increase the resistance when the plug body 2 is broken off.

Two-color molding technology involves supplying two different types of plastic materials to two extrusion cylinders that share one mold or die, and sequentially inserting them into one mold (die) while plasticizing and melting them. A technology that continuously injects resin and performs integral two-color molding.

In the present invention, for example, after the tubular body 1 is extruded, the plug bodies 2 are brought into contact with each other and extruded one after another. As the extruded parts cool, they become loosely connected but come into close contact.

When the plug body 2 molded in this way is held and bent in the direction of the arrow as shown in FIG. 2, the two-color molded plug body 2 is easily peeled off from the interface 9 with the tube body 1. can be separated and removed.

The resin used for two-color molding may be any resin commonly used for medical pipes and the like, as long as they are two incompatible resins.

The incompatible resins may be resins of different materials, or composite resins of different materials containing some of the same resin to the extent that they can be separated.

For medical pipes, polycarbonate and soft PVC resin are generally used. If the tubular body 1 is made of a relatively soft PVC resin or the like, when the plug is grasped and separated and removed, the entire plug is twisted, making it difficult to thread it. Therefore, in the present invention, in order to facilitate the removal of the plug, the plug and the tube are formed into two parts by a two-color molding method or the like as described above.

The fourth opening 14 is sealed by the stopper 2 when not in use, but when it becomes necessary to connect another member to the fourth opening 14, the stopper 2 is sealed as shown in FIG. 2 is removed by bending it from the boundary surface 9 and peeling it off. This allows fluid communication between the tube body 1 and other members.

Specific Effects of the Invention The effects of the tube body 1 equipped with the stopper 2 as illustrated in FIG. 1 will be described below when used for plasmapheresis therapy.

First, as shown in FIG. 3a, all the clamps 16, 17, and 18 of the Y-shaped set 22 are closed, and the bottle needle on the clamp 16 side of the Y-shaped set 22 is inserted into the bottle 27 filled with physiological saline. After opening the clamp 16 and loosening the clamp 18 to fill the Y-shaped set 22 with physiological saline, close the clamp 18.

During the operation up to this point, the stopper 2 of the tube 1 of the present invention is in an unseparated state, as shown in FIG. 1, which is an enlarged view of the circle indicated by the dotted line in FIG. 3a. Therefore, the tube opening 4 is not contaminated during manufacture or use of the tube 1. The first opening 11 of the tubular body 1 communicates with the blood collection needle 24, the second opening 12 communicates with the first blood bag 20, and the third
The opening 13 is connected to a second blood bag 21 via a closed end 19 which can be broken open. The closed end 19, which can be broken open, is in an unbroken state, and the flow path to the second blood bag 21 is blocked.

Next, the connector of the Y-shaped set 22 is connected to the tube body 1. Before the stopper 2 is bent and separated, the middle of the tube to the first blood bag 20 is stopped with a stop clamp 29 so that the medical solution in the first blood bag 20 does not flow backward.

Next, the plug body 2 is grasped, and the plug body 2 is bent from the tube body 1 at the boundary surface 9, and both are peeled off and removed.

Next, connect the Y-type set connector to the opening 6.

Next, blood is collected from the blood donor 23. At this time, the tube in the immediate vicinity of the blood collection needle 24 is stopped with a needle 28, and the blood collection needle 24 is punctured into the vein of the blood donor 23.
After confirming that blood has entered the blood collection tube, remove the cap 28 and the stopper 29 to connect the flow path to the first blood bag 20.

The flow path to the second blood bag 21 is closed, and blood collected through the blood collection needle 24 is collected in the first blood bag 20 by gravity blood collection.

Next, as shown in FIG. 3b, the first blood bag 2
After sufficient blood has been collected into the first blood bag 20, the flow path to the first blood bag 20 is sealed using a tube sealer or two aluminum rings (not shown), and the first blood bag 20 is separated. The whole blood in the separated first blood bag 20 is centrifuged.

During this period, blood donor 23 received Y from saline bottle 27.
Physiological saline is dripped through the mold set 22, the fourth opening 4 of the tube body 1, and the blood collection needle 24.

The separated concentrated platelets and concentrated red blood cells are removed from the discharge port 25 of the blood bag through the drain hole 1 of the Y-shaped set 22.
The blood is returned to the donor 23 via the Y-shaped set 22 and the tube body 1 through the blood collection needle 24.

After blood return is completed, the closed end 19 that can be opened by breaking is broken, the flow path to the second blood bag 21 is opened, and the second blood bag is passed through the blood collection needle 24 that has already been punctured into the blood donor 23. 2. Collect blood into blood bag 21. The blood collected in the second blood bag 21 is centrifuged and separated in the same manner as in the first blood bag 20.
Each operation of the return ring blood is repeated.

Effects of the Invention Since the tube body of the present invention has a separable plug body formed from mutually incompatible materials and joined together, it is easy to peel and separate the tube body and the plug body by bending and folding from the interface of the tube body and the plug body. Therefore, it is easy to open the blood cell return port, etc.

If the plug body and tube body are manufactured using a two-color molding method, etc.
The plug body and tube body can be manufactured by integral molding, and the manufacturing process is simple. In addition, the break-off surface is almost flat, making it easy to handle after opening and has a good appearance.

If the cross-sectional shape of the outer wall of the plug body is other than a perfect circle, the plug body can be easily grasped and furthermore easily bent.

[Brief explanation of drawings]

FIG. 1 is a partially sectional plan view showing an embodiment of a tube body provided with a separable stopper according to the present invention. Second
The figure is a partial plan view illustrating a state in which the plug of the present invention is separated. Figures 3a and 3b are
FIG. 2 is a blood collection system diagram when the tube of the present invention is used for plasmapheresis therapy. Explanation of symbols, 1...Tube body, 2...Plug body, 4...
4th opening, 5... large diameter part, 6... tube opening end,
7... Plug body open end, 8... Plug body closed end, 9... Boundary surface, 11... First opening, 12... Second opening, 1
3... Third opening, 14... Fourth opening, 15... Rib, 16, 17, 18... Cleaning, 19... Closed end that can be opened by breaking, 20... First blood bag, 21 ...Second blood bag, 22...Y type set, 23...Blood donor, 24...Blood collection needle, 25...
...Blood bag outlet, 27...Physiological saline bottle,
28... Kotsuheru, 29... Stopkremme.

Claims (1)

[Scope of Claims] 1. A tube body having at least two openings; the tube body is made of an incompatible material, and has a closed end, and the closed end is inserted into a predetermined opening of the tube body. The plug body is joined on the opposite side, and the joint between the tube body and the plug body has a large number of fine irregularities present on the joint surface of at least one of the tube body and the plug body, and the other side has a large number of fine irregularities. A tube with a separable plug body, characterized in that the tube body and the plug body are joined together in a state in which the material of the joint surface enters, and the joint strength is such that the tube body and the plug body can be separated from the joint part. body. 2. A tube body equipped with a separable plug body according to claim 1, wherein the plug body and the tube body are integrally molded by a two-color molding method. 3. A tube body equipped with a separable plug body according to claim 1 or 2, wherein the cross-sectional shape of the outer wall of the plug body is a shape other than a perfect circle.