Catheter balloon and balloon catheter

A catheter balloon comprising a cylindrical portion and attaching portions for a catheter, said catheter balloon having a base layer formed of a high-strength polymer and one or more covering layers formed over at least one surface of said base layer of the same flexible polymer or different flexible polymers more flexible than said high-strength polymer, and said covering layer or covering layers together bearing 10% or more part of the bursting stress of the balloon, and said cylindrical portion having a wall thickness of 25 .mu.m or thinner.

A catheter balloon comprising a cylindrical portion and attaching portions for a catheter, said catheter balloon having a base layer formed of a high-strength polymer, a first covering layer formed over the outside surface of said base layer of an flexible polymer having a ratio of the elongation at break of the high-strength polymer to that of the flexible polymer within a range from about 1:0.7 to 1:1.3 and being more flexible than the high-strength polymer, and a second covering layer formed over the outside surface of said first covering layer of another flexible polymer more flexible than said flexible polymer for said first covering layer.

A balloon catheter comprises of a tubular catheter body and a balloon attached to a distal end portion of said tubular catheter body, and said balloon comprising a cylindrical portion and attaching portions for a catheter, said catheter balloon having a base layer formed of a high-strength polymer and one or more covering layers formed over at least one surface of said base layer of the same flexible polymer or different flexible polymers having a ratio of the elongation at break of the high-strength polymer to that of the flexible polymer within a range from about 1:0.7 to 1:1.3 and being more flexible than said high-strength polymer, and said cylindrical portion having a wall thickness of 25 .mu.m or thinner.

A balloon catheter comprises of a tubular catheter body and a balloon attached to a distal end portion of said tubular catheter body, and said balloon comprising a cylindrical portion and attaching portions for a catheter, said catheter balloon having a base layer formed of a high-strength polymer and one or more covering layers formed over at least one surface of said base layer of the same flexible polymer or different flexible polymers more flexible than said high-strength polymer, and said covering layer or covering layers together bearing 10% or more part of the bursting stress of the balloon, and said cylindrical portion having a wall thickness of 25 .mu.m or thinner.

A balloon catheter comprises of a tubular catheter body and a balloon attached to a distal end portion of said tubular catheter body, and said balloon comprising a cylindrical portion and attaching portions for a catheter, said catheter balloon having a base layer formed of a high-strength polymer, a first covering layer formed over the outside surface of said base layer of an flexible polymer having a ratio of the elongation at break of the high-strength polymer to that of the flexible polymer within a range from about 1:0.7 to 1:1.3 and being more flexible than the high-strength polymer, and a second covering layer formed over the outside surface of said first covering layer of another flexible polymer more flexible than said flexible polymer for said first covering layer.