Balloon for balloon catheter and balloon catheter

A balloon for a balloon catheter having a longitudinal direction extending from a proximal side to a distal side, and radial and circumferential directions, both orthogonal to the longitudinal direction, comprising:

• a straight portion, a proximal tapered portion located further toward the proximal side than the straight portion, and a distal tapered portion located further toward the distal side than the straight portion, wherein:
• the straight portion comprises a cylindrical balloon main body and a ridge provided on an outer surface of the balloon main body, the ridge protruding outward in the radial direction and extending in the longitudinal direction,
• a notch is formed in the ridge, and
• the notch comprises a specific notch satisfying a Requirement A or a Requirement B, wherein:
• the Requirement A is that, in a cross section taken along the longitudinal direction and passing through a top portion of the ridge, an outer edge of the ridge in the specific notch has a proximal first segment extending radially outward and linearly inclined proximally, and a proximal second segment extending radially outward and linearly inclined proximally provided on the proximal side relative to the proximal first segment, wherein:
• the proximal first segment extends radially outward at an angle P1 of 35° or more and less than 90° with respect to the longitudinal direction from the distal side toward the proximal side, and
• the proximal second segment extends radially outward at an angle P2 that is smaller than the angle P1 by 20° or more with respect to the longitudinal direction from the distal side toward the proximal side, and
• the Requirement B is that, in the cross section taken along the longitudinal direction and passing through the top portion of the ridge, the outer edge of the ridge in the specific notch has a distal first segment extending radially outward and linearly inclined distally, and a distal second segment extending radially outward and linearly inclined distally provided on the distal side relative to the distal first segment, wherein:
• the distal first segment extends radially outward at an angle Q1 of 35° or more and less than 90° with respect to the longitudinal direction from the proximal side toward the distal side, and
• the distal second segment extends radially outward at an angle Q2 that is smaller than the angle Q1 by 20° or more with respect to the longitudinal direction from the proximal side toward the distal side.