JPH0674148U - Tear tube made of tetrafluoroethylene resin - Google Patents

Abstract

(57) [Summary] [Configuration] The present invention provides a tube for introducing a linear or tubular medical device (20) such as a catheter into a living body.
(1) Insert the medical device (20) into the hollow part, and after introduction, hub
(3) A tear tube (1) for introducing a medical device, wherein the tube body (2) is torn and removed, and the medical device (20) is left in the living body. A tear tube made of a tetrafluoroethylene resin, which is characterized by comprising a mixture of a fluoroethylene resin and a low molecular weight fluororesin of 3 to 50% by weight. [Effect] According to the present invention, a tear tube for introducing a medical device having a low tear strength and a stable tearing property can be obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tear tube made of a tetrafluoroethylene resin for introducing a medical instrument used when inserting and indwelling a catheter, a guide wire or the like in a living body.

[0002]

[Prior art]

 BACKGROUND ART Conventionally, when a linear or tubular medical device such as a catheter or a guide wire is introduced into a living body through the skin, a flexible synthetic resin medical device introduction tube has been used.

FIG. 1 is a front view of a tear tube for introducing a medical device according to the present invention. In the tear tube 1 shown in the figure, 2 is a tube main body, 3 is a cylindrical hub, 3a is two slits provided parallel to the axis at opposite positions of the hub peripheral wall, and 3b is a hub protrusion. . Next, a method of using the tear tube when inserting the catheter into the living body will be described with reference to FIG. First, although not shown, the needle of the injection cylinder is inserted from the hub 3 into the tube body 2, and when the needle tip projects from the tip of the tube body 2, the injection needle is punctured into the blood vessel 10 of FIG. Then, the syringe is pulled out together with the needle, and the catheter 20 is inserted from the hub 3 into the tube body 2 and introduced into the blood vessel 10.

This tube for introducing a medical device is unnecessary after introducing a catheter, a guide wire or the like into the body, is not preferable in terms of hygiene, and also interferes with subsequent medical procedures. Therefore, in order to remove this unnecessary medical device introduction tube with the catheter, guide wire, etc. introduced into the body, a method of tearing the tube in the extrusion direction is used. That is, the tube body 2 is pulled out from the body while gripping the protruding piece 3b of the hub 3 and tearing along the slit 3a.

The tetrafluoroethylene resin tube molded by the paste extrusion method has a large orientation in the extrusion direction of the tube and can be torn, which is suitable for the above-mentioned use. However, the tube made of tetrafluoroethylene resin molded by the conventional paste extrusion method is easy to tear as it is as a tube for introducing medical devices, that is, it has a low tearing strength that can be lightly torn and is stable until the end of the tube. Since the tearability described above cannot be obtained, various methods for providing more orientation have been proposed. For example, a method of stretching the tetrafluoroethylene resin tube and a method of increasing the extrusion speed when extruding the paste and lowering the firing temperature to lower the degree of firing of the tetrafluoroethylene resin tube are proposed. ing.

[0006]

[Problems to be solved by the device]

 However, in order to perform drawing processing on such a conventional tetrafluoroethylene resin tear tube, a special device is required, the operation is troublesome, and the obtained tube becomes expensive. There was a point. Further, in the method of lowering the degree of firing of the tetrafluoroethylene resin tube, there is a problem that firing unevenness is likely to occur, resulting in a large variation in the tear strength of the tube and stable tearability cannot be obtained.

[0007]

[Means for Solving the Problems]

 The present invention was made in view of such conventional problems, and when introducing a linear or tubular medical device such as a catheter into a living body, the medical device is inserted into the hollow portion of the tube and introduced. A tear tube for introducing a medical device, in which the tube is later torn and removed, and the medical device is placed in a living body.The tube material is made of 97 to 50% by weight of tetrafluoroethylene resin and 3 to 50% by weight of a low content. A tear tube made of a tetrafluoroethylene resin, which is made of a mixture with a molecular weight fluororesin. A particularly suitable tear tube is a low molecular weight fluororesin having a molecular weight of 5,000 to 600,000 and a particle size of 40 μm or less.

The tetrafluoroethylene resin used in the present invention is preferably a fine powder for paste extrusion and has a particle size of about 300 μm.

The low molecular weight fluororesin used in the present invention includes tetrafluoroethylene (PTFE) resin, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA) resin, tetrafluoroethylene. / Hexafluoropropylene copolymer (FEP) resin and the like. Further, the low molecular weight fluororesin powder has a molecular weight of 5,000 to 600,000, and particularly preferably 250,000 to 600,000, as a fluororesin which does not itself become a fiber when extruded. If the particle size is 40 μm or less, a tube with a uniform wall thickness can be extruded.

When a low-molecular-weight fluororesin powder is added to the above-mentioned paste-extruding tetrafluoroethylene-resin powder, the added low-molecular-weight fluororesin powder does not become fibrous, so that the paste-extruding tetrafluoroethylene powder for extrusion is not formed. Shear force is further applied by the resin powder, the orientation of the extrusion tube is increased, and the tear stability is improved.

When the blending amount of the low molecular weight fluororesin powder is less than 3% by weight, the orientation is low and stable tearability cannot be obtained. On the other hand, if it is more than 50% by weight, the moldability is deteriorated and the smoothness of the tube surface is deteriorated. In the case of the present invention, the selection of the firing conditions of the tube is not related to the tear strength and tear stability.

[0012]

【Example】

 The present invention will be described below based on embodiments.

Example 1 Tetrafluoroethylene resin powder for paste extrusion (Teflon 6J manufactured by Mitsui DuPont Fluorochemical Co., Ltd.) 80% by weight and a low molecular weight tetrafluoroethylene resin powder (manufactured by Mitsui DuPont Fluorochemical Co., Ltd.) TLP10F-1) 20% by weight, and then mixed with 17.5% by weight of the total amount of extrusion aid (Isovar G manufactured by Exxon Chemical Co., Ltd.), mixed, and aged at 24 ° C for 1 day, and used as a raw material for tube molding. And A tube having an inner diameter of 1.8 mm and an outer diameter of 2.1 mm was extruded with a paste extrusion molding machine using this molding raw material. The extruded tube was continuously fired through a drying oven and a firing oven at 400 to 450 ° C. The tear strength and tear stability of the thus-obtained tear tube made of a tetrafluoroethylene resin were tested by the following methods, and the results are shown in Table 1.

Examples 2 to 5 Example 2 in which the addition amount of the low molecular weight tetrafluoroethylene (PTFE) resin powder was changed as shown in Table 1 with respect to the tetrafluoroethylene (PTFE) resin In Example 5, in which 4 to 4 and low molecular weight tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA) resin powder were added, a tube was prepared in the same manner as in Example 1. The results are shown in Table 1.

Comparative Examples 1 and 2 The tube of Comparative Example 1 prepared under the same conditions as in Example 1 without adding the low molecular weight fluororesin powder, and the low molecular weight fluororesin powder were not added, and the drying furnace and firing were performed. A tube of Comparative Example 2 prepared under the same conditions as in Example 1 was obtained except that the set temperature of the furnace was lowered by 30 ° C. These results are also shown in Table 1.

The test method is as follows.

(1) Tear strength Cut the tube to a length of 100 mm, put a slit in the center of one end to a length of 40 mm, grasp both ends of the tube divided by this slit with a chuck of a tensile tester, and pull speed It was torn at 200 mm / min, and the maximum value was taken as the measured value of tear strength. Then, the average of the measured values of n = 20 was taken as the tear strength, and 3σ was obtained.

(2) Tear stability Cut the tube to a length of 300 mm, put a slit in the length of 40 mm as in (1) above, grasp both ends of the tube divided by the slit, and pull at a pulling speed of 200 mm / mi. Tear at n, and those that were torn over the entire length of the tube were rated as good, and those that were not torn were rated as bad.

[0019]

[Table 1] (Unit)

[0020]

[Effect of device]

 As can be seen from the results in Table 1, the tetrafluoroethylene resin tube molded by the paste extrusion method is normally oriented in the extrusion direction due to the fiberization when passing through the extrusion die, but the conventional tube is a comparative example. Like Nos. 1 and 2, the easy-tear property required as a tube for introducing a medical device cannot be obtained. According to the present invention, by using a raw material mixed with a low molecular weight fluororesin that promotes the orientation of the tetrafluoroethylene resin without itself being formed into a fiber, the purpose of the conventional paste extrusion molding method can be improved. A tear tube made of tetrafluoroethylene resin is obtained.

As described above, the tear tube made of the tetrafluoroethylene resin of the present invention can be easily molded without using special manufacturing equipment or equipment. Also, since it is not necessary to lower the firing temperature, there is little variation in tear strength due to uneven firing, and stable tearability can be obtained. In addition, since the orientation of the tube in the extrusion direction is large, the tear strength can be reduced. In addition, it can be easily torn from any position in the circumferential direction of the tube end face and can be torn straight over 30 cm or more in the length direction, making it a tear tube made of tetrafluoroethylene resin for medical device introduction. It has sufficient necessary easy tearability.

[Brief description of drawings]

FIG. 1 is a front view of a tear tube associated with the present invention.

FIG. 2 is a diagram illustrating the use of a tear tube related to the present invention.

[Explanation of symbols]

 1 Tear tube 2 Tube body 3 Hub 3a Slit 3b Projection piece 20 Catheter

Claims (2)

[Scope of utility model registration request] 1. When introducing a linear or tubular medical device such as a catheter into a living body, the medical device is inserted into the hollow portion of the tube, and after the introduction, the tube is torn and removed to put the medical device into the living body. A tear tube for indwelling medical device introduction, where the tube material is 97-50% by weight
A tear tube made of a tetrafluoroethylene resin, characterized in that it comprises a mixture of the tetrafluoroethylene resin and a low molecular weight fluororesin of 3 to 50% by weight. 2. A low molecular weight fluororesin has a molecular weight of 5,000.
The tear tube made of a tetrafluoroethylene resin according to claim 1, which has a particle size of ˜600,000 and a particle size of 40 μm or less.