Apparatus and method for measuring an induced perturbation to determine a physiological parameter
First Claim
1. 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; and
wherein 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.
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Accused Products
Abstract
A monitor for determining a patient'"'"'s physiological parameter includes a calibration device configured to provide a calibration signal representative of the 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 physiological parameter. In the preferred embodiment, the physiological parameter measured is blood pressure, however, the present invention can also be used to analyze and track other physiological parameters such as vascular wall compliance, strength of ventricular contractions, vascular resistance, fluid volume, cardiac output, myocardial contractility and other related parameters.
991 Citations
17 Claims
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1. A monitor for determining a physiological parameter of a patient, comprising:
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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; and wherein 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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A processor for determining a physiological parameter of a patient with an apparatus having 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, and a noninvasive sensor adapted to be positioned over said blood vessel and configured to sense a hemoparameter and to generate a noninvasive sensor signal representative of said hemoparameter, said processor comprising:
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a first input configured to receive said calibration signal; a second input configured to receive said noninvasive sensor signal; a filter configured to separate from said noninvasive sensor signal a component representing a received exciter 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; a relationship routine 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; and a determination routine configured to determine said physiological parameter based at least in part on said noninvasive sensor signal and said relationship. - View Dependent Claims (8, 9, 10, 11)
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12. A method of determining a physiological parameter of a patient, comprising the steps of:
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providing a calibration signal representative of one of the patient'"'"'s physiological parameters and storing the calibration signal; inducing a transmitted exciter waveform into the patient; noninvasively sensing a hemoparameter and generating a noninvasive sensor signal representative of said hemoparameter and containing a component of a received exciter waveform that varies with a period of the blood pressure; separating from said noninvasive sensor signal a component representing a received exciter 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; determining 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; and processing said calibration signal and said noninvasive sensor signal to determine said physiological parameter based at least in part on said noninvasive sensor signal and said relationship. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification