| abstract |
A sheet or tube of fluororesin material having continnuous pores, particularly polytetrafluoroethylene, has a nap nraised on at least one surface thereof, and is suitable for nprosthetic use as a patch, or an artificial blood vessel. A nmethod of manufacturing such napped fluororesin material ncomprises impregnating fluororesin material having continnuous pores with water, freezing it, raising a nap thereon, nand defrosting and dewatering it. |