Catheter tubing of controlled in vivo softening
AssigneeBecton, Dickinson and Company
InventorsMin-Shiu Lee, Mutlu Karakelle, David E. Spielvogel, Robert A. Taller
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Abstract
A catheter tubing has a layer of a hydrophobic stiffening polymer encapsulated by a layer of hydrophilic thermoplastic base polymer. Preferred stiffening polymers are polyesterpolyether block copolymers. Preferred base polymers are thermoplastic polyetherurethanes. The encapsulated layer may be a stripe or an annular layer having base polymer layers laminated on both surfaces thereof.
Claims1
A catheter tubing comprising a stripe of a thermoplastic hydrophobic polyester-polyether block copolymer having a Shore D hardness of about 50 to 80 encapsulated in a hydrophilic thermoplastic polyetherurethane, said polyetherurethane consisting essentially of the reaction product of 4,4'-diphenylmethane diisocyanate, polytetramethylene ether glycol and 1,4-butanediol.
Dependencies are inferred from the claim text.