An automatic controller utilizes a pulse oximeter signal to regulate the oxygen mixture output, peak expiratory end pressure, and inspiratory ventilation time from a positive pressure respiratory assist ventilator. The pulse oximeter senses a patient's hemoglobin saturation and pulse rate by an optical...http://www.google.com.tw/patents/US5388575?utm_source=gb-gplus-share專利 US5388575 - Adaptive controller for automatic ventilators
