Patent ID: 7556611
Filing Date: 2009-07-07
Classification: A61M,F04B

Abstract:
1. An apparatus for processing blood comprising a blood processing path for conducting blood through said apparatus; a plurality of pumps for controlling the flow of blood through said path; at least one control circuit electrically coupled to said pumps and controlling the operation of said pumps; a reservoir in said path, said reservoir configured to contain a fluid, wherein a fluid level of said fluid in said reservoir is variable; vent means in fluid communication with said reservoir, said vent means allowing air to pass into and out of said reservoir; a first sensor couple to said reservoir for detecting said fluid level within said reservoir and electrically connected to said control; a computer programmed with a control program for performing a test of pump ratios between at least two of said pumps by causing a first pump to pump fluid in a first direction into said reservoir and a second pump to pump fluid in a second direction out of said reservoir and finding a ratio of the action of said first pump to said second pump.