Patent ID: 9149192
Filing Date: 2015-10-06
Classification: A61B

Abstract:
1. A method for calculating blood pressure from a patient, said method comprising: detecting an electrical waveform corresponding to the electrical activity of the patient's heart with a first sensor comprising a first electrode located at a first location on a subject and a second electrical signal measured by a second electrode located at a second location on the subject, the first and second electrodes operably connected to an amplifier system that generates the electrical waveform from the electrical activity which is detected by the first and second waveforms; detecting a first pulse waveform with a second sensor located on a hand of the subject; detecting a second pulse waveform with a third sensor located on the opposite hand of the subject; transmitting the electrical waveform, the first pulse waveform, and the second pulse waveform to a microprocessor; and processing the electrical waveform, the first pulse waveform, and the second pulse waveform by using the microprocessor to (i) identify a first feature in the electrical waveform corresponding to a heartbeat, (ii) identify a second feature in the first pulse waveform corresponding to the heartbeat, (iii) identify a third feature in the second pulse waveform corresponding to the heartbeat, (iv) calculate a first time difference between the first feature and the second feature, (v) calculate a second time difference between the first feature and the third feature; (vi) calculate a third time difference between the first time difference and the second time difference and (vii) calculate the subject's blood pressure using the third time difference and an algorithm relating the third time difference to blood pressure.