Patent ID: 8747330
Filing Date: 2014-06-10
Classification: A61B

Abstract:
1. A method for measuring respiratory rate from a patient, comprising the following steps: (a) measuring an impedance pneumography signal from the patient with an impedance pneumography sensor connected to at least two electrodes mounted on the patient's torso, the impedance pneumography signal representing a time-dependent capacitance change in the patient's torso; (b) measuring at least one motion signal with a three axis motion sensor mounted on the patient's torso and having an axis of measurement aligned into the patient's torso, the at least one motion signal comprising signal components corresponding to breathing-induced motion, posture of the patient, and degree of motion of the patient; (c) analyzing the motion signal with a first microprocessor located on the patient's body to determine a motion parameter indicative of the patient's degree of motion; (d) analyzing the motion parameter with the first microprocessor, wherein (e) using the second microprocessor, collectively processing both the motion signal and impedance pneumography signal to determine coefficients corresponding to a digital filter; (f) transmitting the coefficients from the second microprocessor to the first microprocessor; (g) using the first microprocessor, processing one of the motion signal and impedance pneumography signal with the coefficients to determine a digitally filtered waveform; and (h) using the first microprocessor, analyzing the digitally filtered waveform to determine the respiratory rate.