Patent ID: 7803120
Filing Date: 2010-09-28
Classification: A61B

Abstract:
1. A method for measuring a blood pressure of a user, the method comprising: generating a first optical waveform from a signal from a first optical sensor positioned on the user; generating a second optical waveform from a signal from a second optical sensor positioned on the user, the second optical waveform generated simultaneously with the first optical waveform, the second optical sensor positioned a distinguishable distance from the first optical sensor on the user; generating an electrical waveform from a signal from a first electrode positioned in proximity with the first optical sensor and a signal from a second electrode positioned in proximity with the second optical sensor; using a microprocessor to determine a first pulse transit time, the first pulse transit time calculated by processing the electrical waveform and the first optical waveform; using the microprocessor to determine a second pulse transit time, the second pulse transit time calculated by processing the electrical waveform and the second optical waveform; processing the first optical signal or a processed version thereof and the second optical signal or a processed version thereof to determine a third pulse transit time; and processing the first, second, and third pulse transit times to determine a blood pressure value for the user.