Patent ID: 6629961
Filing Date: 2003-10-07
Classification: A61L,C08J

Abstract:
A method for the manufacture of a medical device comprising an elongate shaft, wherein the outer surface of the elongate shaft is coated with a stable hydrophilic coating for facilitating insertion of the elongate shaft into a body passageway, the method comprising the steps of:a) forming the elongate shaft from a polyether block amide with a hardness in the range of 25 Sh D to 70 Sh D; and b) forming the hydrophilic coating on the elongate shaft by applying sequentially to the surface of the elongate shaft first a solution comprising between 0.05 to 40% (weight to volume) of an isocyanate compound and thereafter a solution containing between 0.5 and 50% (weight to volume) of polyvinylpyrrolidone and curing at an elevated temperature, wherein the hydrophilic coating on the elongate shaft presents a slippery and adherent surface when wet.