SYSTEMS AND METHODS FOR CALIBRATING PUMP STROKE VOLUMES DURING A BLOOD SEPARATION PROCEDURE

摘要

A method is provided for calibrating a pump during a blood separation procedure that has at least a first and second state or phase where fluid is flowed to or from a reservoir by action of the pump. The state or phase of the procedure may be a priming state, a draw state, a separation state and a return state, and the pump calibration may be performed between consecutive performances of the same procedure state. The calibration is based on a variance between the volume of fluid predicted to be processed by the pump for the given state of the procedure and the actual volume processed based on the change of weight of the reservoir. Recalibration of the pump, if necessary, is accomplished before the performance of the second phase is commenced.

主权项

1. A method for calibrating a pump during an blood separation procedure having at least a first and second state where fluid is flowed to or from a reservoir by the pump, comprising:
a) providing a predetermined value for a flow rate of fluid to or from the reservoir for the first state of the procedure; b) obtaining the weight of the reservoir at the beginning of the first state of the procedure; c) operating the pump to flow fluid to or from the reservoir to perform the first state of the procedure; d) obtaining the weight of the reservoir at the end of the first state of the procedure; e) comparing the weight of the reservoir at the beginning of the first state of the procedure to the weight of the reservoir at the end of the first state of the procedure to determine an actual flow rate of fluid to or from the reservoir; f) determining a variance between the actual flow rate and the predetermined value for the flow rate; and g) adjusting the predetermined value for the flow rate for the second state of the procedure based on the variance.