Patent ID: 7727191
Filing Date: 2010-06-01
Classification: A61B,A61M

Abstract:
1. A catheter comprising: a proximal end portion and a distal end portion, the proximal end portion defining at least one fluid inlet port and at least one fluid outlet port; a first expandable membrane having a first pressurization limit, and a second expandable membrane, having a second pressurization limit, wherein the second pressurization limit is approximately 20 psig greater than the first pressurization limit; wherein the first expandable membrane is coupled to the catheter at an inner bond joint, and the second expandable membrane is coupled to the catheter at an outer bond joint, and wherein the first pressurization limit is determined by the sealing strength of the inner bond joint; the first expandable membrane defining a cooling chamber, the second expandable membrane disposed around the first expandable membrane defining a junction between the first and second expandable membranes; a coolant injection lumen in fluid communication with the at least one fluid inlet port and the cooling chamber; a primary coolant return lumen in fluid communication with the at least one fluid outlet port and the cooling chamber, the coolant injection lumen, the cooling chamber, and the primary coolant return lumen defining a first fluid pathway; and, a secondary coolant return lumen in fluid communication with the at least one fluid outlet port and the junction, the junction and the secondary coolant return lumen defining a second fluid pathway.