Catheter having coextruded tubing
AssigneeCordis Corporation
InventorsCarlos A. Fontirroche, Stephen J. Querns
Life of this patent
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Abstract
An intravascular catheter comprises a length of flexible plastic tubing which, in turn, comprises an outer plastic layer and an inner plastic layer. The plastic materials of the outer and inner layers are different, and may be chemically bonded to each other. Advantages in catheter design are achieved.
Claims18
An intravascular catheter which comprises a coextruded length of flexible plastic extending most of the length of said catheter tubing, said tubing comprising an outer plastic layer and an inner plastic layer, said inner plastic layer comprising a high density polyethylene having functional groups chemically bonded to the material of the outer plastic layer, the plastic materials of said outer and inner plastic layers being different, the material of the inner plastic layer defining a catheter lumen, the walls of which exhibit lower frictional characteristics than the material of said outer plastic layer, the material of the outer plastic layer having greater stiffness than the material of the inner plastic layer.
An intravascular catheter which comprises a length of flexible plastic tubing having a first lumen and extending most of the length of said catheter, said tubing comprising an outer plastic layer and an inner plastic layer, said inner plastic layer comprising a copolymer of a major amount of high density polyethylene and a minor amount of an unsaturated carboxylic acid or an anhydride thereof, the plastic materials of said outer and inner plastic layers being different, and chemically bonded to each other.
An intravascular catheter which comprises a length of flexible plastic tubing having a plurality of lumens extending through the length of said plastic tubing, one of said lumens defining a lumen wall which carries an inner plastic layer chemically bonded to said lumen wall, the material of said inner plastic layer comprising a high density polyethylene in which from one to five mole percent of maleic anhydride polymer units are present, said inner plastic layer being chemically bonded to the material defining said one lumen wall, the plastic material of said tubing being different from the material of said inner plastic layer.
Dependencies are inferred from the claim text.