Patent ID: 6506340
Filing Date: 2003-01-14
Classification: A61M,Y10S

Abstract:
In an extracorporeal blood processing apparatus comprising a housing having an interior and an inlet port, said housing interior having a blood contact surface formed of a hydrophobic material, said inlet port being in fluid communication with said housing interior blood contact surface, the improvement comprising:a coating consisting essentially of a nontoxic biocompatible liquid surface-active defoaming agent durably deposited on said housing interior blood contact surface by dissolving or dispersing in an organic solvent and applying to said blood-contact surface, said defoaming agent being not significantly water soluble and having a hydrophilic-lipophilic balance rating of about 7 or less, wherein said defoaming agent is selected from the group consisting of primary alkoxylated alcohols and block copolymers of propylene oxide and ethylene oxide, said defoaming agent having a blood defoaming screen test filter bypass foam grade of 2 or less, and wherein the extracorporeal blood processing apparatus is a blood membrane oxygenator comprising a defoamer unit.