| abstract |
An indwelling catheter is made of a blend of a plurality of polyurethane resins containing polyglycols having different molecular weights, or a polyurethane resin containing a plurality of polyglycols having different molecular weights. It shows a dynamic storage modulus of 1 GPa or more under a dry condition at 25° C. and decrease in dynamic storage modulus when changed from a dry condition at 25° C. to a wet condition at 37° C., a decrease percentage of the dynamic storage modulus being less than 60% at the elapsed time of 20 seconds and 60% or more at the elapsed time of 1 minute after placed under the wet condition at 37° C. Its Young's modulus is 50 kgf/mm2 or more under a dry condition at 25° C., which reduces to 25 kgf/mm2 or less within 5 minutes when placed under a wet condition at 37° C. |