Catheter

Abstract

A body (10) of a catheter (1) includes an inner layer (24), a braid (26), and an outer layer (28). The braid (26) includes first and second wires (26a and 26b). The first and second wires (26a and 26b) can be joined together such that the distal end portion (40) of the first wire (26a) winds itself around a side surface of the second wire (26b). A joint (100, 200) includes a first joint portion (110, 210) positioned at the intersection point (30), a second joint portion (120, 220) positioned beyond the first wire (26a) in a width direction (N) of the first wire (26a), and a third joint portion (130, 230) positioned beyond the second wire (26b) in a width direction (N') of the second wire (26b). Thus, even when the first and second wires (26a and 26b) have small thicknesses for size reduction of the braid (26), the first and second wires (26a and 26b) can be joined together with high joint strength by increasing the area of the second joint portion (120, 220) or the thickness of the third joint portion (130, 230).

Description

technical field [0001] The present invention relates to catheters inserted into blood vessels and the like. Background technique [0002] Catheters that are inserted into and used in tubular organs such as blood vessels, digestive tracts, ureters, or internal tissues include the following structure, which is composed of an inner layer (base material tube), an outer layer, and a braid (reinforcement member), wherein the The inner layer is made of resin; the outer layer is made of resin and is formed on the outer periphery of the inner layer; the braid is between the outer layer and the inner layer. From the viewpoint of the performance required for the catheter (pressing performance, torque transmission performance, pressure resistance performance, etc.), the braid is constituted by braiding copper wire or a wire made of metal such as stainless steel. For example, a braid is known in which a first wire made of stainless steel is braided counterclockwise and a second wire mad...

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned method of joining the first wire and the second wire at the intersection point, there is a limit to ensuring the joint strength of the first wire and the second wire.

In order to miniaturize the catheter body, the thickness of the braid needs to be set thinner, but if the thickness of the first wire and the thickness of the second wire are thinned, the first wire and the second wire are joined only at the intersection point to ensure the joint intensity becomes difficult

Therefore, if the first wire and the second wire are joined using another material such as a jig or an adhesive in order to ensure joint strength, there is a problem that the thickness of the braid cannot be made thinner in the end.

[0005] In addition, when the material constituting the first wire rod and the material constituting the second wire rod are different, it may become difficult to weld the first wire rod and the second wire rod by laser.

Therefore, there is only a method of joining the first wire and the second wire using other materials such as jigs and adhesives, and there is a problem that the thickness of the braid cannot be made thinner in the end.

Images