Patent ID: 9713657
Date: 2017-07-25
CPC Classifications: A61L,A61M

Claim:
1. A cylindrical catheter balloon possessing an axis and formed of a membrane comprised of a laminate of at least two layers, one of the layers being a polyamide elastomer layer and the other layer being a polyamide layer, the polyamide layer possessing an inner side, the polyamide elastomer layer being disposed at the inner side of the polyamide layer, a refractive index n r1 in a circumferential direction of a cross-section perpendicular to the axis in an inner side surface of the polyamide layer is greater than a refractive index n r2 in the circumferential direction of a cross-section perpendicular to the axis in an inner side surface of the polyamide elastomer layer, and a difference between the refractive index n r1 and the refractive index n r2 is 0.01 to 0.02, and wherein a refractive index in a radial direction of the cross-section perpendicular to the axis in the inner side surface of the polyamide elastomer layer is greater than a refractive index of the polyamide layer.