Patent ID: 8317492
Filing Date: 2012-11-27
Classification: A61M,F04B,F17D,Y02A,Y10T

Abstract:
1. A disposable cassette configured for operative association with a base unit to replace a volume of a first liquid with a substantially equal volume of a second liquid, the disposable cassette comprising: the first fluid flow network for the first liquid and the second fluid flow network for the second liquid, the first fluid flow network comprising an inlet port and an outlet port for the first liquid, and the second fluid flow network comprising an inlet port and an outlet port for the second liquid; a first balancing pod and a second balancing pod, each balancing pod separated into a first chamber and a second chamber by a flexible membrane configured to provide a seal between the first chamber and the second chamber, wherein the first chamber is in fluid communication with the first fluid flow network and the second chamber is in fluid communication with the second fluid flow network; a first volume of the second liquid can be drawn through the inlet port of the second fluid flow network by the first reciprocating positive displacement membrane pump, stored in the first reciprocating positive displacement membrane pump, and pumped to the second chamber of the first balancing pod to displace the flexible membrane of the first balancing pod and move a first volume of the first liquid out of the first chamber of the first balancing pod to exit the cassette through the outlet port of the first fluid flow network, and a second volume of the second liquid can be drawn through the inlet port of the second fluid flow network by the second reciprocating positive displacement membrane pump, stored in the second reciprocating positive displacement membrane pump, and pumped to the second chamber of the second balancing pod to displace the flexible membrane of the second balancing pod and move a second volume of the first liquid out of the first chamber of the second balancing pod to exit the cassette through the outlet port of the first fluid flow network.