Patent ID: 8926294
Filing Date: 2015-01-06
Classification: A61M,F04B,F17D,Y02A,Y10T

Abstract:
1. A pumping cassette comprising: a housing comprising a first fluid line including a first fluid inlet and a first fluid outlet for a first liquid flowpath configured to contain a first liquid, and a second fluid line including a second fluid inlet and a second fluid outlet for a second liquid flowpath configured to contain a second liquid; a first and a second balancing pods within said housing and in fluid communication with said fluid lines, each one of said first and second balancing pods defining a cavity in which a flexible membrane is disposed, said flexible membrane dividing the cavity between a first chamber and a second chamber, the first chamber in fluid communication with the first fluid line, and the second chamber in fluid communication with the second fluid line, wherein said second chamber is configured to receive a first volume of the second liquid from the second fluid line by expelling a substantially equal volume of the first liquid from the first chamber into the first fluid line; and a first and a second reciprocating positive displacement membrane pumps within said housing, each one of said first and second membrane pumps comprising an actuation chamber separated from a pumping chamber by a flexible membrane, wherein each one of said first and second membrane pumps is in fluid communication with the second fluid line, wherein the first membrane pump is configured to deliver in a pump stroke a volume of the second liquid into the second chamber of the first balancing pod, and wherein the second membrane pump is configured to deliver in a pump stroke a volume of the second liquid into the second chamber of the second balancing pod.