RETURN TO FLOW CALIBRATION

Return-to-flow calibration is an individual upper arm cuff systolic calibration which can provide much higher accuracy of a measurement.

For this purpose, an arm cuff is wrapped around the same arm as the finger cuff and the operator can set the computer system to automatically inflate and deflate the arm cuff. When arm cuff pressure is supra-systolic, no pulsations can be sensed in the finger.

The first slight pulsation that passes under the arm cuff signals return to flow. It is sensed in the finger and detected by the software. The arm cuff pressure is read at that instant and the reconstructed brachial pressure is defined by this individual amount, thus improving bias and precision substantially.