BODY-WORN SYSTEM FOR MEASURING CONTINUOUS NON-INVASIVE BLOOD PRESSURE (cNIBP)
First Claim
1. A system for monitoring a blood pressure value from a patient, comprising:
- (a) a sensor comprising;
a first radiation source configured to emit optical radiation at a first wavelength;
a second radiation source configured to emit optical radiation at a second wavelength;
a photodetector configured to detect radiation emitted by the first radiation source after it passes through a portion of the patient to generate a first signal, and radiation emitted by the second radiation source after it passes through a portion of the patient to generate a second signal; and
a housing comprising the first and second radiation sources and the photodetector; and
,(b) a processing component configured to be worn on the patient'"'"'s body and operably connected to the sensor to receive the first and second signals, the processing component programmed to;
i) collectively process the first and second signals to generate a processed signal;
ii) process the processed signal with a digital filter to generate a filtered signal;
iii) analyze the filtered signal to determine a feature related to blood pressure; and
iv) analyze the feature related to blood pressure to determine the blood pressure 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 monitoring a blood pressure value from a patient, comprising:
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(a) a sensor comprising;
a first radiation source configured to emit optical radiation at a first wavelength;
a second radiation source configured to emit optical radiation at a second wavelength;
a photodetector configured to detect radiation emitted by the first radiation source after it passes through a portion of the patient to generate a first signal, and radiation emitted by the second radiation source after it passes through a portion of the patient to generate a second signal; and
a housing comprising the first and second radiation sources and the photodetector; and
,(b) a processing component configured to be worn on the patient'"'"'s body and operably connected to the sensor to receive the first and second signals, the processing component programmed to;
i) collectively process the first and second signals to generate a processed signal;
ii) process the processed signal with a digital filter to generate a filtered signal;
iii) analyze the filtered signal to determine a feature related to blood pressure; and
iv) analyze the feature related to blood pressure to determine the blood pressure value. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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2. A system for monitoring a blood pressure value from a patient, comprising:
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(a) a sensor comprising;
a first radiation source configured to emit optical radiation at a first wavelength;
a second radiation source configured to emit optical radiation at a second wavelength;
a photodetector configured to detect radiation emitted by the first radiation source after it passes through a portion of the patient to generate a first signal, and radiation emitted by the second radiation source after it passes through a portion of the patient to generate a second signal; and
a housing comprising the first and second radiation sources and the photodetector; and
,(b) a processing component configured to be worn on the patient'"'"'s body and connected to the sensor to receive the first and second signals, the processing component programmed to;
i) process the first and second signals with a digital filter to generate first and second filtered signals;
ii) collectively process the first and second filtered signals to generate a processed signal;
iii) analyze the processed signal to determine a feature related to blood pressure; and
iv) analyze the feature related to blood pressure to determine the blood pressure value.
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3. A system for monitoring a blood pressure value from a patient, comprising:
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(a) a first sensor comprising;
a first radiation source configured to emit optical radiation at a first wavelength;
a second radiation source configured to emit optical radiation at a second wavelength; and
a photodetector configured to detect radiation emitted by the first radiation source after it passes through a portion of the patient to generate a first signal, and radiation emitted by the second radiation source after it passes through a portion of the patient to generate a second signal;(b) a second sensor comprising;
an ECG circuit and at least two electrodes, the second sensor configured to detect electrical signals from the patient and process them to generate a third signal; and
,(c) a processing component configured to be worn on the patient'"'"'s body and connected to the first sensor to receive the first and second signals, and to the second sensor to receive the third signal, the processing component programmed to;
i) collectively process the first and second signals by either subtracting one signal from the other or dividing one signal into the other to generate a processed signal;
ii) process the processed signal with a digital filter to generate a filtered signal;
iii) analyze the filtered signal to determine a first time-dependent feature;
iv) analyze the third signal or a processed version thereof to determine a second time-dependent feature;
v) analyze the first and second time-dependent features to determine a time difference; and
vi) analyze the time difference to determine the blood pressure value.
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4. A system for determining blood pressure values for a patient, comprising:
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(a) a first sensor comprising;
a first and second light source and a photodetector, and configured to measure a first signal corresponding to the first light source and a second signal corresponding to the second light source; and(b) a processing component configured to be worn on the patient'"'"'s body and operably connected to the first sensor and comprising;
a motion sensor for detecting a motion signal and an input port for receiving the first and second signals, the processing component programmed to determine blood pressure values by collectively processing the motion signal and a third signal resulting from combining and then digitally filtering the first and second signals.
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5. A system for determining blood pressure values for a patient, comprising:
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(a) a first sensor comprising;
a first and second light source and a photodetector, and configured to measure a first signal corresponding to the first light source and a second signal corresponding to the second light source;(b) a second sensor comprising;
an ECG circuit and at least two electrodes configured to measure a third signal;(c) a processing component configured to be worn on the patient'"'"'s body and operably connected to the first and second sensors, the processing component programmed to determine blood pressure values by collectively processing the third signal and a fourth signal resulting from combining and then digitally filtering the first and second signals.
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Specification