MINIATURE PIEZOELECTRIC CARDIOVASCULAR MONITORING SYSTEM
First Claim
1. An apparatus comprising:
- a wearable sensor assembly including a flexible band having a polymer layer and a sensing layer both positioned for mounting the wearable sensor onto a sensing region of a subject for measuring vascular wall motion and blood flow dependent measurements over the sensing region, the wearable sensor comprising;
(i) a piezoelectric sensor for measuring raw signal data, in real time, of vascular wall motion and blood flow dependent measurements, wherein the piezoelectric sensor comprises a piezoelectric electrode structure in the sensing layer for measuring the raw signal data in response to physical movement of the sensor region as detected by the piezoelectric sensor, and(ii) a secondary sensor for collecting and extracting photoplethysmograph derived blood flow data and photoplethysmograph derived waveform features; and
a signal processor configured toreceive the raw signal data from the piezoelectric sensor,filter the received raw signal data from the piezoelectric sensor,perform signal decomposition on the filtered raw signal data from the piezoelectric sensor,analyze the received raw signal data from the piezoelectric sensor to extract one or more waveform features from the received raw signal data, andanalyze the photoplethysmograph derived blood flow data and the photoplethysmograph derived waveform features from the secondary sensor and compare the analyzed blood flow data and the waveform features to the extracted one or more waveform features from the piezoelectric sensor to extract indicators of circulating vascular volume and/or vascular tone to characterize and/or predict vascular health of the subject for clinical decision making.
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Accused Products
Abstract
The invention is a passive, wearable sensor that uses a thin piezoelectric material to produce a time history of blood pressure of the patient, with signal processing algorithms to extract physiological information. The sensor consists of a piezoelectric transducer set in a polymer laminate that can be applied to the finger or wrist of the patient. During use, a combination of compressive and bending deformation in the piezoelectric layer in response to blood pressure in the finger or wrist as a voltage output. Using signal processing techniques, the raw signal is filtered and decomposed to obtain a information to form derivative signals such as blood pressure, pulse pressure, pulse pressure variability, heart rate, heart rate variability, and respiratory rate which can be very important pre-cursors in the monitoring of the patient'"'"'s physiological conditions.
33 Citations
25 Claims
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1. An apparatus comprising:
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a wearable sensor assembly including a flexible band having a polymer layer and a sensing layer both positioned for mounting the wearable sensor onto a sensing region of a subject for measuring vascular wall motion and blood flow dependent measurements over the sensing region, the wearable sensor comprising; (i) a piezoelectric sensor for measuring raw signal data, in real time, of vascular wall motion and blood flow dependent measurements, wherein the piezoelectric sensor comprises a piezoelectric electrode structure in the sensing layer for measuring the raw signal data in response to physical movement of the sensor region as detected by the piezoelectric sensor, and (ii) a secondary sensor for collecting and extracting photoplethysmograph derived blood flow data and photoplethysmograph derived waveform features; and a signal processor configured to receive the raw signal data from the piezoelectric sensor, filter the received raw signal data from the piezoelectric sensor, perform signal decomposition on the filtered raw signal data from the piezoelectric sensor, analyze the received raw signal data from the piezoelectric sensor to extract one or more waveform features from the received raw signal data, and analyze the photoplethysmograph derived blood flow data and the photoplethysmograph derived waveform features from the secondary sensor and compare the analyzed blood flow data and the waveform features to the extracted one or more waveform features from the piezoelectric sensor to extract indicators of circulating vascular volume and/or vascular tone to characterize and/or predict vascular health of the subject for clinical decision making. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification