Catheter tubing of controlled in vivo softening
First Claim
1. A tubing comprising one or more discontinuous rods of a hydrophobic thermoplastic stiffening polymer having a Shore D hardness of about 50-80 encapsulated by a hydrophilic thermoplastic polyetherurethane, said polyetherurethane comprising the reaction product of a diisocyanate, a chain extender and a polyetherglycol comprising at least 50% by weight of polytetramethylene ether glycol, said stiffening polymer being selected from the group consisting of a polyolefin, polycarbonate liquid crystalline polymer and polyurethane of 70 to 100% hard segment.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
8 Claims
- 1. A tubing comprising one or more discontinuous rods of a hydrophobic thermoplastic stiffening polymer having a Shore D hardness of about 50-80 encapsulated by a hydrophilic thermoplastic polyetherurethane, said polyetherurethane comprising the reaction product of a diisocyanate, a chain extender and a polyetherglycol comprising at least 50% by weight of polytetramethylene ether glycol, said stiffening polymer being selected from the group consisting of a polyolefin, polycarbonate liquid crystalline polymer and polyurethane of 70 to 100% hard segment.
- 6. A tubing comprising one or more discontinuous rods of a hydrophobic thermoplastic stiffening polymer, said stiffening polymer comprising at least 30% by weight of a polyurethane having a hard segment content of 70-100% and a Shore D hardness of about 50-80%, said discontinuous rod being encapsulated by a hydrophilic thermoplastic polyetherurethane, said polyetherurethane comprising the reaction product of a diisocyanate, a chain extender and a polyetherglycol comprising at least 50% by weight polytetramethylene ether glycol.
Specification