Guide wire
AssigneeTerumo Kabushiki Kaisha
InventorsTakumi Fukuda, Fuminori Sugiyama
Life of this patent
Estimating the term…
Abstract
A guide wire with improved joining strength is provided. The guide wire includes a first wire and a second wire are solid-phase-joined to each other, the first wire and the second wire are made of a Ni—Ti-based alloy. When a section of a crystal grain size is 1 μm in a number-based particle size distribution of crystal grains of a metallographic structure of a joint surface between the first wire and the second wire, the frequency of the crystal grains having a mode particle size is 25% or more and the frequency of the crystal grains having a crystal grain size with a representative diameter of (mode particle size (μm)−1 μm) or more and (mode particle size (μm)+1 μm) or less is 60% or more.
Claims20
A guide wire comprising:
- a first wire and a second wire that are solid-phase-joined to each other, the first wire and the second wire being made of a nickel-titanium-based alloy;
- in a section of a crystal grain size of 1 μm in a number-based particle size distribution of crystal grains of a metallographic structure of a joint surface between the first wire and the second wire, a frequency of a mode particle size is 25% or more and a frequency of a representative diameter being (mode particle size (μm)−1 μm) or more and (mode particle size (μm)+1 μm) or less is 60% or more;
- and
- wherein the section of the crystal grain size is a sectional width used in the number-based particle size distribution of crystal grains, the mode particle size is a representative diameter of a section with a highest frequency in the number-based particle size distribution, and the representative diameter is a median value of each section in the number-based particle size distribution.
A guide wire, the guide wire comprising:
- a first wire;
- a second wire solid-phase joined to the first wire;
- in a section of a crystal grain size of 1 μm in a number-based particle size distribution of crystal grains of a metallographic structure of a joint surface between the first wire and the second wire, a frequency of a mode particle size is 25% or more and a frequency of a representative diameter being (mode particle size (μm)−1 μm) or more and (mode particle size (μm)+1 μm) or less is 60% or more;
- and
- wherein the section of the crystal grain size is a sectional width used in the number-based particle size distribution of crystal grains, the mode particle size is a representative diameter of a section with a highest frequency in the number-based particle size distribution, and the representative diameter is a median value of each section in the number-based particle size distribution.
A method of forming a guide wire, the method comprising:
- solid-phase joining a first wire and a second wire to each other such that in a section of a crystal grain size of 1 μm in a number-based particle size distribution of crystal grains of a metallographic structure of a joint surface between the first wire and the second wire, a frequency of a mode particle size is 25% or more and a frequency of a representative diameter being (mode particle size (μm)−1 μm) or more and (mode particle size (μm)+1 μm) or less is 60% or more, the section of the crystal grain size being a sectional width used in the number-based particle size distribution of crystal grains, the mode particle size being a representative diameter of a section with a highest frequency in the number-based particle size distribution, and the representative diameter being a median value of each section in the number-based particle size distribution.
Dependencies are inferred from the claim text.