Systems and methods for calibrating physiological signals with multiple techniques
First Claim
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1. A method for measuring blood pressure of a subject, comprising:
- determining, with a processor executing a first calibration technique, first calibration data for use in determining blood pressure;
determining, with a processor executing a second calibration technique, second calibration data for use in determining blood pressure, wherein the second calibration technique is different from the first calibration technique;
measuring a differential pulse transit time; and
determining, with a processor, the blood pressure of the subject based at least in part on the differential pulse transit time and at least one of the first calibration data and the second calibration data.
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Abstract
Systems and methods are disclosed herein for calibrating the calculation of physiological parameters. Two or more calibration techniques may be used to determine a relationship between physiological measurements and a desired physiological parameter, such as a relationship between differential pulse transit time (DPTT) and blood pressure. Different calibration techniques may be used in a serial fashion, one after the other, or in a parallel fashion, with different weights accorded to each calibration technique. When physiological or other changes occur, the calibration data may be stored for later use and new calibration data may be generated.
45 Citations
26 Claims
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1. A method for measuring blood pressure of a subject, comprising:
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determining, with a processor executing a first calibration technique, first calibration data for use in determining blood pressure; determining, with a processor executing a second calibration technique, second calibration data for use in determining blood pressure, wherein the second calibration technique is different from the first calibration technique; measuring a differential pulse transit time; and determining, with a processor, the blood pressure of the subject based at least in part on the differential pulse transit time and at least one of the first calibration data and the second calibration data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for measuring blood pressure of a subject, comprising:
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determining, with a processor executing a calibration technique, first calibration data; measuring a first differential pulse transit time; determining, with a processor, the blood pressure of the subject based at least in part on the first differential pulse transit time and the first calibration data; determining that a change event occurred; determining, with a processor executing a calibration technique, second calibration data based on at least two calibration data points taken after the change event occurred; measuring a second differential pulse transit time after the change event occurred; and determining, with a processor, the blood pressure of the subject based at least in part on the second differential pulse transit time and the second calibration data after the change event occurred. - View Dependent Claims (10, 11, 12, 13)
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14. A system for measuring blood pressure of a subject, comprising:
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at least two sensors; and a processor configured to; execute a first calibration technique to determine first calibration data for use in determining blood pressure; execute a second calibration technique to determine second calibration data for use in determining blood pressure, wherein the second calibration technique is different from the first calibration technique; measure a differential pulse transit time based at least in part on data received from the at least two sensors; and determine the blood pressure of the subject based at least in part on the differential pulse transit time and at least one of the first calibration data and the second calibration data. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A system for measuring blood pressure of a subject, comprising:
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at least two sensors; and a processor configured to; execute a calibration technique to determine first calibration data; measure a first differential pulse transit time based at least in part on data received from the at least two sensors; determine the blood pressure of the subject based at least in part on the first differential pulse transit time and the first calibration data; determine that a change event occurred; execute a calibration technique to determine second calibration data based on at least two calibration data points taken after the change event occurred; measure a second differential pulse transit time based at least in part on data received from the at least two sensors after the change event occurred; and determine the blood pressure of the subject based at least in part on the second differential pulse transit time and the second calibration data after the change event occurred. - View Dependent Claims (23, 24, 25, 26)
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Specification