Rapid non-invasive blood pressure measuring device
First Claim
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1. A measurement device for generating an arterial volume indicative signal, the measurement device comprising:
- an exciter adapted to receive an oscillating signal and generate a pressure wave based at least in part on the oscillating signal on the artery at a measurement site on a patient, wherein the pressure wave comprises a frequency; and
a detector placed sufficiently near the measurement site to detect a volumetric signal indicative of arterial volume of the patient, wherein the volumetric signal comprises an amplitude, and wherein the measurement device is connected to a processor, which determines when the amplitude of the volumetric signal is greatest, thereby determining when transmural pressure is about zero.
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Abstract
A measurement device for generating an arterial volume-indicative signal includes an exciter and a detector. The exciter is adapted to receive an oscillating signal and generate a pressure wave based at least in part on the oscillating signal on the artery at a measurement site on a patient. The pressure wave includes a frequency. The detector is placed sufficiently near the measurement site to detect a volumetric signal indicative of arterial volume of the patient.
847 Citations
19 Claims
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1. A measurement device for generating an arterial volume indicative signal, the measurement device comprising:
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an exciter adapted to receive an oscillating signal and generate a pressure wave based at least in part on the oscillating signal on the artery at a measurement site on a patient, wherein the pressure wave comprises a frequency; and
a detector placed sufficiently near the measurement site to detect a volumetric signal indicative of arterial volume of the patient, wherein the volumetric signal comprises an amplitude, and wherein the measurement device is connected to a processor, which determines when the amplitude of the volumetric signal is greatest, thereby determining when transmural pressure is about zero. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of determining the blood pressure of a patient from an arterial volume indicative signal, the method comprising:
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inducing a high-frequency pressure wave onto an artery detecting a signal indicative of arterial volume, wherein the signal includes a high-frequency component from the pressure wave;
filtering low-frequency components from the signal, thereby providing a filtered signal, wherein the filtered signal comprises an amplitude; and
determining when the amplitude of the filtered signal is greatest, thereby determining when transmural pressure is about zero. - View Dependent Claims (9, 10, 11, 12)
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13. A measurement device for determining the blood pressure of a patient by finding a time when transmural pressure is approximately equal to zero, the measurement device comprising:
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a device, which perturbs at least one of pressure and volume of an artery of a patient; and
a pressure transducer placed sufficiently near a measurement site to detect a signal indicative of an oscillation response when the device perturbs the at least one of pressure and volume, wherein the measurement device is in communication with a processor, which determines when an amplitude of the signal is greatest, thereby determining the time when transmural pressure is approximately equal to zero.
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14. A measurement device for determining the blood pressure of a patient, the measurement device comprising:
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an exciter, which induces a pressure oscillation along an artery; and
a detector, which senses the pressure oscillation and outputs a signal indicative of the pressure oscillation, wherein at least one of the exciter and detector are adapted to be placed between portions of an external pressure application device and a measurement site, wherein the measurement device is in communication with a processor, which determines a time when an amplitude of the signal is greatest, and determine a point where transmural pressure is about zero based at least in part upon the time. - View Dependent Claims (15)
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16. A method of determining blood pressure of a patient, the method comprising:
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providing a range of pressures to an artery;
providing an oscillating signal to the artery;
measuring a signal indicative of the oscillating signal and at least one pressure within the range of pressures;
filtering the signal indicative of the oscillating signal and at least one pressure within the range of pressures to produce a filtered signal, wherein the filtered signal comprises an amplitude;
determining a point of about zero transmural pressure when the amplitude of the filtered signal is at maximum; and
determining a pressure within the range in pressures based at least in part from said point of about zero transmural pressure.
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17. A method of determining blood pressure of a patient, the method comprising:
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detecting a signal indicative of an oscillation along an artery; and
determining a point of zero transmural pressure from an amplitude maximum of said detected signal.
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18. A measurement device for generating an arterial volume indicative signal, the measurement device comprising:
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an exciter adapted to receive an oscillating signal and generate a pressure wave based at least in part on the oscillating signal of the artery at a measurement site on a patient, wherein the pressure wave comprises a frequency;
a detector placed sufficiently near the measurement site to detect a volumetric signal indicative of arterial volume of the patient; and
a high pass filter, which substantially removes pulsatile components from the volumetric signal, thereby producing a filtered signal, wherein the filtered signal comprises an amplitude, and wherein the measurement device is in communication with a processor, which determines when the amplitude of the filtered signal is greatest, thereby determining when transmural pressure is about zero.
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19. A measurement device for generating an arterial volume indicative signal, the measurement device comprising:
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an exciter adapted to receive an oscillating signal and generate a pressure wave based at least in part on the oscillating signal on the artery at a measurement site on a patient, wherein the pressure wave comprises a frequency; and
a detector placed sufficiently near the measurement site to detect a volumetric signal indicative of arterial volume of the patient;
wherein the measurement device is in communication with a processor, which digitally filters the volumetric signal, thereby producing a filtered signal, wherein the filtered signal comprises an amplitude, and wherein the processor, determines when the amplitude of the filtered signal is greatest, thereby determining when transmural pressure is about zero.
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Specification