Patent ID: 8968216
Filing Date: 2015-03-03
Classification: A61B,A61M

Abstract:
1. A medical guide wire comprising: a core having a large diameter on a proximal side and being tapered in diameter on a distal side toward a core distal end tip, wherein a core distal end portion spans from a point where the core begins to taper from the large diameter on the proximal side to the core distal end tip; an inner coil formed by helically winding at least one strand, a coil distal end of the inner coil being joined to the core distal end tip on an outer periphery of the core distal end portion of the core, a coil proximal end of the inner coil being joined to the core in the core distal end portion; an outer coil formed by helically winding at least one strand and located outside of the inner coil, the outer coil being longer than the inner coil in a direction of the core, a coil distal end of the outer coil being joined to the core distal end tip and a coil proximal end of the outer coil being joined to the core in the core distal end portion; an inner spaced coil winding portion provided on a distal side of the inner coil, a coil pitch of the inner spaced coil winding portion including a first space between adjacent helical windings of the inner coil; an outer spaced coil winding portion provided in the outer coil located outside of the inner spaced coil winding portion, a coil pitch of the outer spaced coil winding portion including a second space between adjacent helical windings of the outer coil, said second space differing from the first space of the coil pitch of the inner spaced coil winding portion; wherein the inner coil has a large constant diameter portion, a tapered middle portion, and a small constant diameter portion from the proximal side to the distal side and the outer coil has a large constant diameter portion, a tapered middle portion, and a small constant diameter portion from the proximal side to the distal side; the inner and outer spaced coil winding portions are provided in coil distal end portions of the small constant diameter portions, respectively of the inner and outer coils; and an outer diameter ratio (Di