Apparatus and method for measuring an induced perturbation to determine blood pressure
First Claim
1. A monitor for determining a patient'"'"'s physiological parameter, comprising:
- a calibration device configured to provide a calibration signal representative of the patient'"'"'s physiological parameter;
an exciter, positioned over a blood vessel of the patient, for inducing a transmitted exciter waveform into the patient;
a noninvasive sensor, positioned over said blood vessel, said noninvasive sensor configured to sense a hemoparameter and to generate a noninvasive sensor signal representative of said hemoparameter containing a component of a received exciter waveform;
a processor configured to determine a relationship between a property of said received exciter waveform and a property of the physiological parameter; and
wherein said processor is connected to receive said calibration signal and said noninvasive sensor signal, said processor configured to determine said physiological parameter based at least in part on said calibration signal, said noninvasive sensor signal, and said relationship.
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Accused Products
Abstract
A monitor for continuously determining a patient'"'"'s physiological parameter includes a means for obtaining a periodic calibration measurement of the patient'"'"'s physiological parameter. An exciter, positioned over an artery of the patient induces an exciter waveform into the patient'"'"'s arterial blood. A noninvasive sensor, positioned over the artery, senses a hemoparameter and provides a noninvasive sensor signal output representative of the hemoparameter. A processor receives the calibration measurement and noninvasive sensor signal output. The processor determines a DC offset based on the calibration measurement and processes the noninvasive sensor signal to continuously determine the patient'"'"'s physiological parameter. A method includes steps for performing the present invention. 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.
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Citations
26 Claims
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1. A monitor for determining a patient'"'"'s physiological parameter, comprising:
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a calibration device configured to provide a calibration signal representative of the patient'"'"'s physiological parameter; an exciter, positioned over a blood vessel of the patient, for inducing a transmitted exciter waveform into the patient; a noninvasive sensor, positioned over said blood vessel, said noninvasive sensor configured to sense a hemoparameter and to generate a noninvasive sensor signal representative of said hemoparameter containing a component of a received exciter waveform; a processor configured to determine a relationship between a property of said received exciter waveform and a property of the physiological parameter; and wherein said processor is connected to receive said calibration signal and said noninvasive sensor signal, said processor configured to determine said physiological parameter based at least in part on said calibration signal, said noninvasive sensor signal, and said relationship. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A processor for determining a patient'"'"'s physiological parameter with an apparatus having a calibration device configured to provide a calibration signal representative of the patient'"'"'s physiological parameter, an exciter positioned over a blood vessel of the patient for inducing a transmitted exciter waveform into the patient, and a noninvasive sensor positioned over said blood vessel, said noninvasive sensor 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; a relationship routine configured to determine a relationship between a property of said received exciter waveform and a property of said physiological parameter; and a determination routine configured to determine said physiological parameter based at least in part on said calibration signal, said noninvasive sensor signal, and said relationship. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of determining a patient'"'"'s physiological parameter, comprising the steps of:
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providing a calibration signal representative of the patient'"'"'s physiological parameter 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; determining a relationship between a property of said received exciter waveform and a property of the physiological parameter; and determining said physiological parameter based at least in part on said calibration signal, said non-invasive sensor signal, and said relationship. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. A monitor for determining a patient'"'"'s blood pressure, comprising:
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an inflatable cuff positioned on an extremity of the patient and configured to provide a calibration signal representative of the patient'"'"'s physiological parameter; an exciter positioned over a blood vessel of the patient and configured to induce a transmitted exciter waveform into the patient; a noninvasive sensor, positioned over said blood vessel and at a distance from said exciter, said noninvasive sensor configured to sense a hemoparameter and to generate a noninvasive sensor signal representative of said hemoparameter containing a component of a received exciter waveform; a processor configured to determine a relationship between a property of said received exciter waveform and a property of said physiological parameter; wherein said processor is connected to receive said calibration signal and said noninvasive sensor signal; wherein said processor includes a filter configured to separate from said noninvasive sensor signal a component representing said received exciter waveform; and wherein said processor is configured to determine said physiological parameter based at least in part on said calibration signal, said noninvasive sensor signal, and said relationship. - View Dependent Claims (26)
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Specification