Patent ID: 8197439
Filing Date: 2012-06-12
Classification: A61M,F04B,G16H,Y02A

Abstract:
1. A method for determining a volume of fluid moved by a pump, the method including: measuring a first pressure for a pump control chamber when the pump control chamber is isolated from a reference chamber, the pump control chamber having a volume that varies at least in part based on movement of a portion of the pump; measuring a second pressure for the reference chamber when the reference chamber is isolated from the pump control chamber, the reference chamber having a known volume; measuring a third pressure associated with the pump control chamber after fluidly connecting the reference chamber and the pump control chamber, but before substantial equalization of pressures between the pump control and reference chambers has occurred; measuring a fourth pressure associated with the reference chamber after fluidly connecting the reference chamber and the pump control chamber, but before substantial equalization of pressures between the pump control and reference chambers has occurred; determining a volume for the pump control chamber based on the first, second, third and fourth measured pressures.