Patent ID: 7186223
Filing Date: 2007-03-06
Classification: A61M

Abstract:
1. A guide wire having a distal end portion provided with radiation impermeability and flexibility, comprising a core wire having a distal end portion and a proximal end portion and a circular cross-section decreasing in diameter at the distal end portion toward a distal end of the core wire, and a coil wire having a constant diameter provided coaxially with the core wire and provided on the distal end portion of the core wire, wherein the coil wire consists of two wires which are adjacent to each other in an axial direction of the core wire and which are alternately wound around the core wire uniformly in an axial direction of the core wire, and wherein a distal end portion of one of said two wires is formed of a radiation impermeable material selected from the group consisting of platinum, gold and iridium and a remaining portion of which is formed of a radiation permeable and elastic material selected from the group consisting of stainless steel, piano wire and an amorphous alloy, and a whole of the other of said two wires is formed of a radiation permeable and elastic material selected from the group consisting of stainless steel, piano wire and an amorphous alloy or a radiation impermeable and elastic material selected from the group consisting of tungsten, tantalum, an alloy containing tungsten as a main component, and an alloy containing tantalum as a main component.