Steerable guidewire and method for manufacturing steerable guidewire, steerable catheter and method for manufacturing steerable catheter

A steerable guidewire, which is inserted into a catheter and guides the catheter to a desired blood vessel, comprising:

• a steerable tip part that can be bent in at least two stages due to an external stimulus and that is steered in a predetermined direction such that an end of the steerable guidewire is steerable;
• and
• a non-steerable tip part that is not steerable, wherein:
• the steerable tip part comprises
• a first steerable tip part having a first length and bent so as to have a first bending radius, and
• a second steerable tip part having one end connected to the first steerable tip part and the other end connected to the non-steerable tip part, having a second length, and bent and steered so as to have a second bending radius;
• the first steerable tip part is positioned farther from the non-steerable tip part than the second steerable tip part;
• the first length is smaller than a second length, and the first bending radius is smaller than the second bending radius;
• the steerable tip part has a tubular shape and is formed in a non-symmetrical structure with respect to a center axis line of the inside thereof;
• and
• in the steerable tip part, a distance from the center axis line to a first inner circumferential surface is larger than a distance from the center axis line to a second inner circumferential surface facing the first inner circumferential surface.

A steerable catheter comprising:

• a steerable tip part that can be bent in at least two stages due to an external stimulus and that is steered in a predetermined direction such that an end of the steerable guidewire is steerable;
• and
• a non-steerable tip part that is not steerable, wherein:
• the steerable tip part comprises
• a first steerable tip part having a first length and bent in a first angle with respect to the non-steerable tip part, and
• a second steerable tip part having one end connected to the first steerable tip part, having a second length, and bent and steered into a second angle with respect to the non-steerable tip part;
• the first steerable tip part is positioned farther from the non-steerable tip part than the second steerable tip part;
• the first length of the first steerable tip part is smaller than a sum of lengths of steerable tip parts other than the first steerable tip part, and the first angle is steered so as to be larger than the second angle;
• the steerable tip part has a tubular shape and is formed in a non-symmetrical structure with respect to a center axis line of the inside thereof;
• and
• in the steerable tip part, a distance from the center axis line to a first inner circumferential surface is larger than a distance from the center axis line to a second inner circumferential surface facing the first inner circumferential surface.