Patent ID: 6045509
Filing Date: 2000-04-04
Classification: A61B

Abstract:
A monitor for determining a physiological parameter of a patient, comprising:a calibration device configured to provide a calibration signal representative of one of the patient's physiological parameters;an exciter adapted to be positioned over a blood vessel of the patient and configured to induce a transmitted exciter waveform into the patient;a noninvasive sensor adapted to be positioned over said blood vessel and configured to sense a hemoparameter and to generate a noninvasive sensor signal containing a component of a received exciter waveform that varies with a period of the blood pressure;a processor coupled to said noninvasive sensor and including a filter configured to separate said received excited waveform that varies with a period of the blood pressure from at least one other component of the noninvasive sensor signal that does not so vary;wherein said processor is configured to determine a relationship between a property of said received exciter waveform and a property of said physiological parameter based at least in part on said calibration signal; andwherein said processor is connected to receive said calibration signal and said noninvasive sensor signal and is configured to determine said physiological parameter based at least in part on said noninvasive sensor signal and said relationship.