Freezing balloon with larger size adjustability at lower ablation pressure

A balloon catheter for an endovascular catheter system (210) includes a frozen balloon (236) formed from a blend of polyurethane and a polyamide block copolymer. The percentage of the polyurethane to polyamide block copolymer can be varied. For example, a cryoballoon (236) may be formed from greater than 50% polyurethane and less than 50% polyamide block copolymer; the component A is formed by more than 75% of polyurethane and less than 25% of polyamide block copolymer; or formed from about 85% polyurethane and about 15% polyamide block copolymer. Further, the ratio of the change in inflation pressure (in psi) to the change in outer diameter (in mm) of the cryoballoon (236) and the ratio of the outer diameter (in mm) of the cryoballoon (236) to inflation pressure (in psig) may be varied to form the desired cryoballoon (236). 一种用于血管内导管系统(210)的球囊导管包括由聚氨酯和聚酰胺嵌段共聚物的共混物形成的冷冻球囊(236)。聚氨酯与聚酰胺嵌段共聚物的百分比可以变化。例如，冷冻球囊(236)可以由大于50％的聚氨酯和小于50％的聚酰胺嵌段共聚物形成；由大于75％的聚氨酯和小于25％的聚酰胺嵌段共聚物形成；或者由约85％的聚氨酯和约15％的聚酰胺嵌段共聚物形成。此外，可改变膨胀压力的变化(以