JPH0515602A - Catheter - Google Patents

Abstract

PURPOSE:To provide the catheter which has excellent flexibility, elasticity and strength, does not bend at the time of insertion, and has the excellent performance to inject drugs and to suck bodily fluid. CONSTITUTION:This catheter is constituted by using desired fiber materials which are made into a woven structure as the core material of the catheter tube. Metallic fibers, graphite fibers, glass fibers, ceramic fibers or combinations of >=2 kinds thereof are usable as the fiber materials. The use of polar resin fibers is recommended as well. The catheter which has the excellent flexibility, elasticity and strength, does not bend at the time of insertion, and allows the safe execution of the injection of the drugs and the suction of the bodily fluid, etc., is obtd. by using the fiber materials, such as metallic fibers, graphite fibers, glass fibers and ceramic fibers, which are made into the woven structure as the core material.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to catheters, and more particularly to improvements in catheter tubes.

[0002]

2. Description of the Related Art Insertion into the urethra, blood vessels, other tubes and cavities,
BACKGROUND ART A catheter for the purpose of injecting a liquid, inhaling it, or ensuring the patency of a duct is widely used in the medical field for the diagnosis and treatment of various diseases.

Therefore, the catheter tube inserted into various ducts or cavities of the human body needs to have appropriate flexibility, elasticity, and strength (strength of the waist). Therefore, the core material of the catheter tube is required. Although various metal wires inserted therein are also provided as above, good performance was not always obtained.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems and is excellent in flexibility, elasticity and strength, does not bend when inserted, and is effective for injecting medicines and body fluids. It is intended to provide a catheter having excellent inhalation performance.

[0005]

In order to achieve the above object, the catheter according to the present invention is characterized in that a desired fiber material having a woven structure is used as a core material of the catheter tube. As the fibrous material, metal fibers, graphite fibers, glass fibers, ceramic fibers or a combination of two or more thereof can be preferably used.
It is also recommended to use polar resin fibers.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the embodiments shown in the drawings. FIG. 1 is an enlarged sectional view along the axial direction of the distal end portion of various catheter tubes used in the catheter according to the present invention, FIG. 2 is an enlarged sectional view perpendicular to the axis thereof, and FIG.
FIG. 4 is a sectional view showing an example of a catheter tube having a core structure, and FIG. 4 is a sectional view showing an example of a catheter tube having a 4-core structure.

FIGS. 1 (a), (b) and (c) show the tip of a catheter tube.
It shows different examples of the end part, (a) is
The tip opening is formed at right angles to the axis, (b) is formed diagonally
(C) has an opening on the side of the tip
Is shown. These catheter tubes are amorphous
Material, stainless steel material, Ti material, iron material, SiC material, AlO ₂
Material such as metal fiber, graphite fiber, glass fiber, ceramic
Mixed fiber or a combination of two or more of these
Is twisted into multiple threads, and the threads are woven into a woven structure.
The core material is 1 and the soft resin 2 (see FIG. 2)
It is impregnated and covered. The woven fabric of the core material 1 is the above
Such as wire diameter 10 ~ 20μmφ, aspect ratio 50 ~ 500
Approximately 3 to 10 fibers are combined to make a yarn, and
It is woven into a pipe shape.

Flexible resin 2 for impregnating and covering the core material 1
Generally, polyurethane rubber, polybutadiene rubber, silicone rubber, fluorosilicone rubber, polyacetate, polyvinyl acetate, ethylene vinyl acetate, polyvinyl acetal, methyl cellulose, polymethylphenylsiloxane rubber, etc. are preferably used.
Alternatively, it is also recommended to infiltrate the surface with polyethylene, ethylene propyl, polypropylene, polyolefin, polyvinyl chloride, ethylene vinyl acetate, polyamide and the like. When inserting a catheter into a blood vessel, it is also recommended to coat it with a hydrophilic resin such as polyhydroxyethyl acrylate, hydroxypropyrole cellulose, polyethylene glycol, polyacrylamide to improve hydrophilicity and lubricity. . Furthermore, when the catheter is used by being left inside the body, it is impregnated or coated with a polyvinylidene chloride resin having a polarity (+), and the polar effect is utilized to selectively aspirate or eliminate the necessary filtrate. You can

The wall thickness of a catheter tube is usually 50-100.
The diameter of the pipe is about 0.1 μm to 0.5 mmφ at the tip portion and about 0.5 to 3.0 mmφ at the thick portion.

The opening for injecting or inhaling a drug or the like at the distal end portion of the catheter tube does not necessarily need to make a hole in the woven fabric as the core material. Only that portion is not impregnated with the resin 2 and the core material Alternatively, the medicine or the like may be exuded or sucked from the gap between the textures of the fabric.

FIG. 3 shows an embodiment of a catheter tube having a three-core structure using a core material in which three tubes having different diameters are concentrically woven, and the wall surface near the tip of the outer tube 11 is shown. An opening 11a, an opening 12a on the wall surface near the tip of the intermediate tube 12, and an opening 13a on the tip of the inner tube 13a so that different drugs may be injected or body fluid may be inhaled from these openings. Has become. For example, while the anesthetic is being exuded from the tip opening 13a of the inner tube 13a, necessary medicine can be injected or body fluid can be sucked from the subsequent openings 12a and 11a.

Similarly, in a concentric two-core catheter tube, for example, when a double tube weave is made by using a twisted yarn of SUS3043 material fiber having a wire diameter of 17 μmφ, the opening size at the time of pressurization is 15 ~ 20μmφ, 1.3kg / pure water
Stable injection was possible at a pressure of cm ² .

FIG. 4 shows an embodiment of a catheter tube in which three small-diameter tubes 15, 16 and 17 are provided inside the outer tube 14, and the tips of the tubes 15, 16 and 17 are located outside. An opening is formed in the side wall near the tip of the tube 14. In addition, the tip of the outer tube 14 is not impregnated with the resin 2 shown in FIG. 2, and the drug or the like is exuded or inhaled through the gap of the texture of the core material of the woven structure. The inner tubes 15, 16 and 17 may be mere rubber or other synthetic resin tubes without the fabric core material.

Thus, for example, in the embodiment shown in FIG. 3, a glass fiber for laser transmission is provided in the inner tube 13a so that the affected area is burned off by laser light.
It is also possible to insert up to 13a. Further, it is also possible to insert a drug through the glass fiber of the endoscope and observe the affected area, perform laser irradiation and other treatments. Furthermore, a metal fiber such as Ti may be used as the textile fiber of the core material, and a desired drug may be locally diffused while a pulse current of 0.5 to 10 mA is passed through the catheter tube as an electrode. Further, it is also possible to adopt a mode in which a balloon is inserted at the tip of the catheter or Pt plating is applied to the woven fabric of the core material.

The present invention having the above construction can be applied to any catheter such as an intraurethral catheter, an intravascular catheter, an endotracheal catheter, a solasic catheter, a trocar catheter, a drain catheter and the like.

[0016]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, by using a fiber material such as a metal fiber, a graphite fiber, a glass fiber, and a ceramic fiber having a woven structure as a core material of a catheter tube, flexibility, It is possible to provide a catheter which is excellent in elasticity and strength, does not bend when inserted, and can stably inject a drug, inhale a body fluid and the like.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view along the axial direction of the distal end portion of various catheter tubes used in the catheter according to the present invention.

FIG. 2 is an enlarged sectional view perpendicular to the axis.

FIG. 3 is a cross-sectional view showing an example of a catheter tube having a three-core structure.

FIG. 4 is a cross-sectional view showing an example of a catheter tube having a four-core structure.

[Explanation of symbols]

1 Woven core material 2 Flexible resin 11-17 tubes

Claims (2)

[Claims] 1. A catheter characterized by using a desired fiber material having a woven structure as a core material of a catheter tube. 2. The catheter according to claim 1, wherein the fiber material is metal fiber, graphite fiber, glass fiber, ceramic fiber or a combination of two or more of these.