Medical device with hydrophilic coating
AssigneeAstra Aktiebolag
InventorsAnette Israelsson, Jan Utas
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Abstract
Method for the manufacture of a medical device which presents a hydrophilic surface coated elongate shaft for insertion into a body passageway comprising the steps of having the elongate shaft formed from a thermoplastic elastomer material selected from the group consisting of a polyether block amide and a styrene block copolymer and forming the hydrophilic coating on the elongate shaft by applying sequentially to the surface of the elongate shaft a solution comprising between 0.05 to 40% (weight to volume) of an isocyanate compound and a solution containing between 0.5 and 50% (weight to volume) of polyvinylpyrrolidone and curing at an elevated temperature.
Claims15
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.
A medical device comprising an elongate shaft for insertion into a body passageway, wherein the elongate shaft is made from a polyether block amide with a hardness in the range of 25 Sh D to 70 Sh D, and the outer surface of the elongate shaft is coated with a stable hydrophilic coating formed from an interpenetrating network of polyvinylpyrrolidone and polyurea, and wherein the hydrophilic coating on the elongate shaft presents a slippery and adherent surface when wet.
Dependencies are inferred from the claim text.