BODY-WORN SYSTEM FOR MEASURING CONTINUOUS NON-INVASIVE BLOOD PRESSURE (cNIBP)
First Claim
1. A system for measuring a vital sign value from a patient, comprising:
- (a) a first sensor configured to generate a first time-dependent signal indicative of one or more contractile properties of the patient'"'"'s heart;
(b) a second sensor configured to generate a second time-dependent signal indicative of one or more contractile properties of the patient'"'"'s heart, the second sensor comprising a radiation source configured to irradiate a portion of the patient, and a detector configured to detect radiation emitted from the radiation source after it passes through the portion of the patient, the detector comprising at least two pixel elements, each configured to generate a unique signal;
(c) a motion sensor configured to generate a motion signal indicative of movement of a region of the patient that the motion sensor is attached to; and
,(d) a processing component configured to be worn on the patient'"'"'s body, the processing component programmed to;
(i) analyze a signal generated by a first pixel element;
(ii) analyze a signal generated by a second pixel element;
(iii) analyze the motion signal;
(iv) based on analysis of the motion signal, select a signal from at least one of the pixel elements characterized by a relatively low degree of motion corruption; and
(v) analyze the signal from (iv) to determine a vital sign value.
1 Assignment
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Accused Products
Abstract
The present invention provides a technique for continuous measurement of blood pressure based on pulse transit time and which does not require any external calibration. This technique, referred to herein as the ‘Composite Method’, is carried out with a body-worn monitor that measures blood pressure and other vital signs, and wirelessly transmits them to a remote monitor. A network of body-worn sensors, typically placed on the patient'"'"'s right arm and chest, connect to the body-worn monitor and measure time-dependent ECG, PPG, accelerometer, and pressure waveforms. The disposable sensors can include a cuff that features an inflatable bladder coupled to a pressure sensor, three or more electrical sensors (e.g. electrodes), three or more accelerometers, a temperature sensor, and an optical sensor (e.g., a light source and photodiode) attached to the patient'"'"'s thumb.
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Citations
21 Claims
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1. A system for measuring a vital sign value from a patient, comprising:
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(a) a first sensor configured to generate a first time-dependent signal indicative of one or more contractile properties of the patient'"'"'s heart; (b) a second sensor configured to generate a second time-dependent signal indicative of one or more contractile properties of the patient'"'"'s heart, the second sensor comprising a radiation source configured to irradiate a portion of the patient, and a detector configured to detect radiation emitted from the radiation source after it passes through the portion of the patient, the detector comprising at least two pixel elements, each configured to generate a unique signal; (c) a motion sensor configured to generate a motion signal indicative of movement of a region of the patient that the motion sensor is attached to; and
,(d) a processing component configured to be worn on the patient'"'"'s body, the processing component programmed to;
(i) analyze a signal generated by a first pixel element;
(ii) analyze a signal generated by a second pixel element;
(iii) analyze the motion signal;
(iv) based on analysis of the motion signal, select a signal from at least one of the pixel elements characterized by a relatively low degree of motion corruption; and
(v) analyze the signal from (iv) to determine a vital sign value. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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2. A system for measuring a blood pressure value from a patient, comprising:
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(a) a first sensor configured to generate a time-dependent electrical signal indicative of one or more contractile properties of the patient'"'"'s heart, the first sensor comprising an ECG circuit and at least two electrodes; (b) a second sensor configured to generate a time-dependent optical signal indicative of one or more contractile properties of the patient'"'"'s heart, the second sensor comprising a radiation source configured to irradiate a portion of the patient, and a detector configured to detect radiation emitted from the radiation source after it passes through the portion of the patient, the detector comprising at least two pixel elements, each configured to generate a unique signal; (c) a motion sensor configured to generate a motion signal indicative of movement of a region of the patient that the motion sensor is attached to; and
,(d) a processing component configured to be worn on the patient'"'"'s body, the processing component programmed to;
(i) analyze a signal generated by a first pixel element;
(ii) analyze a signal generated by a second pixel element;
(iii) analyze the motion signal;
(iv) based on analysis of the motion signal, select a signal from at least one of the pixel elements characterized by a relatively low degree of motion corruption;
(v) analyze the signal from (iv) to determine a first feature;
(vi) analyze the time-dependent electrical signal to determine a second feature;
(vii) determine a time difference between the first and second features; and
(viii) determine a blood pressure value from the time difference.
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3. A system for measuring a blood pressure value from a patient, comprising:
- an ECG sensor configured to generate a time-dependent ECG signal;
an optical sensor featuring a radiation source and a multi-pixel radiation detector, with each pixel in the detector configured to detect radiation from the radiation source after it irradiates the patient to generate a unique signal;
a motion sensor attached to a region of the patient and configured to generate a motion signal indicative of movement of the region; and
a processing component programmed to analyze a signal from at least one pixel in the detector determined to have a relatively low degree of correlation with the motion signal to determine the blood pressure value.
- an ECG sensor configured to generate a time-dependent ECG signal;
Specification