Expandable catheter having hydrophobic surface

Details Expandable catheter having hydrophobic surface Expandable catheter having hydrophobic surface

A - Human Necessities

61

M

A61M 29/04 (2006.01) A61L 29/08 (2006.01) A61L 29/16 (2006.01)

Patent

CA 2043051

A catheter of a thermoplastic elastomeric hydrophilic polyurethane is coated on at least the outside surface with a hydrophobic polymer and expands to a larger lumen size in about 3 to 15 minutes when contacted with an aqueous liquid. The hydrophilic polyurethane may be synthesized by one-shot bulk polymerization, and may be melt extruded into a base tubing and dip coated with the hydrophobic polymer, or the hydrophilic polyurethane and hydrophobic polymer may be coextruded. The catheter may have multiple lumens and may include an antithrombogenic agent, antiinfective agent and radiopaque agent.

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