A blood pressure measurement system is configured to perform a calibration automatically when a calibration condition is satisfied. The calibration condition is based upon one or more parameters of pulse waves of a subject. The parameters may include pulse wave area; a time difference between systolic...http://www.google.ca/patents/US7455643?utm_source=gb-gplus-sharePatent US7455643 - Continuous non-invasive blood pressure measurement apparatus and methods providing automatic recalibration
