Importance

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Abstract

A monitor for determining a patient's physical condition includes a calibration device configured to provide a calibration signal representative of a patient's physiological parameter. An exciter is positioned over a blood vessel of the patient for inducing a transmitted exciter waveform into the patient. A noninvasive sensor is positioned over the blood vessel, where the noninvasive sensor is configured to sense a hemoparameter and to generate a noninvasive sensor signal representative of the hemoparameter containing a component of a physiological parameter waveform and a component of a received exciter waveform. In this context, a hemoparameter is defined as any physiological parameter related to vessel blood such as pressure, flow, volume, velocity, blood vessel wall motion, blood vessel wall position and other related parameters. A processor is configured to determine a relationship between a property of the received exciter waveform and a property of the physiological parameter. The processor is connected to receive the calibration signal and the noninvasive sensor signal, and the processor is configured to process the calibration signal and the noninvasive sensor signal to determine the physical condition. In an exemplary embodiment, the physical condition is arterial stiffness that represents cardiovascular disease, however, many additional physical conditions can be measured and determined such as arterial elasticity, arterial thickness, arterial wall compliance and other conditions. Also, in an exemplary embodiment, the physiological parameter measured is blood pressure, however, the present invention can also be used to analyze and track other physiological parameters

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First Claim