Seed and Berry
Method of measuring blood pressure with a plethysmograph
 A method and apparatus for determining arterial blood pressures using a photoplethysmograph is provided. In the inventive method the photoplethysmograph output is calibrated to the patient using an auxiliary blood pressure determining instrument, a constant k particular to the patient's arterial blood pressure-volume relationship is determined and is stored for later use; at the time of measurement information is obtained from the photoplethysmograph output; and a computer determines the patient's systolic and diastolic blood pressures. 
SpaceLabs Medical, Inc.
A A
A61B A61B
inventional inventional
Wei-Min Paul H.
Wang Jones