Guide wire

摘要

A guide wire includes a first wire disposed on the distal side of the guide wire and a second wire disposed on the proximal side. The second wire has an elastic modulus larger than the first wire. The first wire is joined to the second wire at a welded portion by welding. A coil is disposed on the distal side of the first wire. A cover layer is formed on the outer peripheral surface of the wire member in such a manner as to cover at least the welded portion. The cover layer is made from a material capable of reducing the friction of the cover layer, for example, a fluorocarbon resin or a hydrophilic material, to thereby improve the sliding performance of the guide wire. Such a guide wire is excellent in operationality and kink resistance.

主权项

1. A method of manufacturing a guide wire comprising:
providing a first wire and a second wire, the first wire and the second wire being made from different materials; coating at least a part of the first wire and the second wire with a first polymer cover layer while heating the first wire and the second wire, the first polymer cover layer including a distal-side cover layer which covers the first wire and a proximal-side cover layer which covers the second wire, said distal-side and proximal-side cover layers being separate and distinct; welding the first wire to the second wire at a welded portion; and coating an outer periphery of the welded portion with a second polymer cover layer being a different material from the first polymer cover layer while the welded portion is not heated, wherein the second polymer cover layer is made from a silicone resin, the distal-side cover layer is disposed on the distal side of the second polymer cover layer without an axial gap between the distal-side cover layer and the second polymer cover layer, and the proximal-side cover layer is disposed on the proximal side of the second polymer cover layer without an axial gap between the proximal-side cover layer and the second polymer cover layer.