JP2006325934A - Method for working end face of catheter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for working the end face of a catheter easily and precisely. <P>SOLUTION: The method for working the end face of the catheter having a plurality of lumens comprises: a process of inserting metal core into the lumen; a process of inserting the catheter into the proximal end side of a die; a heating process for heating the die; and a process of pressing the catheter and the metal core into a distal end side. The lumen of the die has two or more different diameters. Moreover, the distal end part of the lumen of the die is tapered. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for processing an end face of a catheter.

  Catheters are used in various applications, and their shapes vary depending on the purpose, case, and body part used. Some catheters have two or more lumens, and the most utilized is a two-lumen tube, which is mainly used as a catheter tube for a balloon catheter (for example, Patent Document 1).

  After being inserted into the body, the balloon catheter is indwelled and fixed in the body by inflating the balloon. At the time of insertion, the balloon is in a deflated state, and its outer diameter is substantially the same as the outer diameter of the catheter shaft. It is desirable to be. Therefore, in general, the outer diameter of the catheter shaft at the balloon mounting portion is often smaller than the other portions, thereby reducing the difference between the outer diameter of the balloon mounting portion and the outer diameter of the catheter shaft. .

  The reduced diameter portion of the catheter shaft is generally obtained by heating and stretching the catheter shaft, fitting an outer diameter regulating jig having an inner diameter of the desired shape, and heating again to obtain the desired shape. I have been. However, when produced by the above method, not only the productivity is poor, but also when the reduced diameter portion is heated in post-processing, there is a problem that a dimensional change occurs. Furthermore, there is a possibility that a dimensional change may occur with the passage of time, and there is a risk of causing a problem that the drainage efficiency decreases due to an increase in the outer diameter of the reduced diameter portion or a decrease in the inner diameter of the lumen.

In addition, it is desirable that the tip part of the reduced diameter part is processed into a taper shape and the difference in outer diameter with the guide wire used together is smaller, but when the diameter reduction process is performed by the above method, the balloon lumen side The step between the catheter tip and the guide wire is increased, which is one of the factors that increase the resistance when the balloon catheter is inserted.
Japanese Patent Laid-Open No. 10-286309

  An object of the present invention is to provide a processing method capable of more easily carrying out end face processing of a catheter in order to solve the above problems.

Such an object is achieved by the present invention described in the following (1) to (4).
(1) A method for processing an end face of a catheter having a plurality of lumens, the step of inserting a cored bar into the lumen, the step of inserting the catheter into the proximal side of the mold, and heating for heating the mold And a step of pushing the catheter and the cored bar toward the distal end side after the heating step.
(2) The method for processing an end face of the catheter according to (1), wherein the lumen of the mold has at least two different diameters.
(3) The catheter end face processing method according to the above (1) or (2), wherein the distal end portion of the lumen of the mold is tapered.
(4) The end face processing method for a catheter according to any one of (1) to (3), wherein at least one of the cored bars is a stranded wire obtained by twisting a plurality of wires.

  According to the present invention, the end face of the catheter can be processed more easily.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an enlarged cross-sectional view of an end surface portion (2) of a catheter (double lumen tube) (1) manufactured according to the present invention. The double lumen tube (1) has an outer diameter of 1 to 20 mm and an overall length of 50 to 5000 mm, and is made of a thermoplastic resin or the like, preferably made of polyvinyl chloride, a thermoplastic urethane elastomer, or a styrene-ethylene-butadiene-styrene copolymer. .

  The outer diameter of the end surface portion (2) of the double lumen tube (1) is smaller than that of the main body. The outer diameter of the end surface portion (2) is a value obtained by subtracting the thickness of the balloon to be combined from the outer diameter of the main body, so that when the balloons are combined, the outer diameter of the balloon and the double lumen tube (1) The outer diameter of the main body can be substantially matched. It is desirable that the end surface portion (2) has a tapered shape that further decreases in diameter toward the tip.

  The outer diameter of the double lumen tube (1) tip (3) is determined to be appropriate in the range of φ0.3 to 5.0 depending on the outer diameter of the guide wire used together. The main lumen (4) has a substantially circular shape with an inner diameter of 0.1 to 15 mm, and its tip is open at the tip of the double lumen tube (1). The sub-lumen (5) has a substantially circular shape with an inner diameter of 0.01 to 10 mm, and is closed by the tip (3) of the double lumen tube (1).

  Hereinafter, the manufacturing method of the end surface part (2) of this double lumen tube (1) will be described.

  First, the metal core (6) is inserted into the lumens of the main lumen (4) and the sub-lumen (5) of the unprocessed double lumen tube (1). The metal core (6) is made of a metal such as stainless steel or nickel titanium alloy, and the outer diameter thereof is substantially the same as the inner diameter of the main lumen (4) and the sub-lumen (5) of the end face portion (2) to be manufactured. Like that. In order to give the core wire (6) more flexibility, it is desirable to use a stranded wire obtained by twisting a plurality of wires. The core metal (6) inserted into the main lumen (4) protrudes from the tip of the double lumen tube (1), and the core metal (6) inserted into the sub-lumen (5) has the tip inside the double lumen tube (1). Place it so that it is located in

  The mold (7) has a lumen having two inner diameters, and the tip portion is processed into a taper shape. The inner diameter of the base end side (8) is selected according to the outer diameter of the double lumen tube (1). The inner diameter of the distal end side (9) is a part forming the end surface part (2) of the double lumen tube (1), and the inner diameter matched with the outer diameter of the end surface part (2) of the target double lumen tube (1) Select.

  After inserting the end surface of the double lumen tube (1) in which the core metal (6) is inserted into the base end side (8) of the mold (7), the mold (7) is heated. The heating temperature is appropriately selected from 150 to 350 ° C., although it depends on the material and dimensions of the double lumen tube (1). When the mold (7) is heated to the target temperature, the double lumen tube (1) is pushed into the tip side (9) of the mold.

  After the double lumen tube (1) is pushed in, the mold (7) is cooled, and the double lumen tube (1) and the core metal (6) are removed from the mold (7). Thereafter, the metal core (6) is removed from the double lumen tube (1).

  The end face processing of the catheter can be performed more reliably and easily.

The end surface part expanded sectional view of the catheter which becomes one Example of this invention. The implementation figure of the end surface processing of the catheter used as one Example of this invention.

Explanation of symbols

1. Catheter (double lumen tube)
2. 2. Double lumen tube end face part Double lumen tube tip 4. 4. Main lumen Balloon lumen 6. Core metal 7. Mold 8. 8. Mold base end side Mold tip side

Claims (4)

A method for processing an end face of a catheter having a plurality of lumens, a step of inserting a core metal into the lumen, a step of inserting the catheter into a proximal end side of a mold, and a heating step of heating the mold, After the heating step, a step of pushing the catheter and the cored bar toward the distal end side;
A method for processing an end face of a catheter, comprising:   The method of processing an end face of a catheter according to claim 1, wherein the lumen of the mold has at least two different diameters.   The catheter end face processing method according to claim 1 or 2, wherein a distal end portion of the lumen of the mold is tapered. The catheter end face processing method according to any one of claims 1 to 3, wherein at least one of the core bars is a stranded wire obtained by twisting a plurality of wires.