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US 10,327,649 B1Granted
Non-invasive wearable blood pressure monitoring system
AssigneeSensogram Technologies, Inc.
InventorsVahram Mouradian, Armen Poghosyan
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Abstract
Presented are embodiments of an apparatus and methodology for non-invasive, continuous or semi-continuous monitoring of human blood pressure by photoplethysmography (PPG) based sensor system.
Claims9
A method of continuously monitoring blood pressure, the method comprising:
- (a) retrieving previously stored values for inductance (L) and compliance of the cardiovascular system (C);
- (b) receiving a photoplethysmographic (PPG) signal for each pulse or for a given time period;
- (c) filtering the received PPG signal to produce a clean PPG signal;
- (d) determining the heart rate;
- (e) determining the peripheral resistance using the heart rate and a profile-based lookup table;
- (f) calculating the blood pressure using the clean PPG signal, the peripheral resistance, L and C;
- and
- (g) determining the systolic and diastolic blood pressure.
5 more elements
A system for continuously monitoring blood pressure, the system comprising:
- a light source;
- an optical sensor positioned to receive reflected light from the light source;
- a signal processing unit adapted to receive an electrical signal from the optical sensor and configured to output a clean digital signal;
- a microprocessor in communication with the light source, the signal processing unit, a memory and a computer/wireless interface, the microprocessor having instructions for:
- (a) retrieving previously stored values for inductance (L) and compliance of the cardiovascular system (C);
- (b) receiving a photoplethysmographic (PPG) signal for each pulse or for a given time period;
- (c) filtering the received PPG signal to produce a clean PPG signal;
- (d) determining the heart rate;
- (e) determining the peripheral resistance from thea selected profile-based lookup table using the heart rate;
- (f) calculating the blood pressure using the clean PPG signal, the peripheral resistance, L and C;
- and
- (g) determining the systolic and diastolic blood pressure.
9 more elements
Dependencies are inferred from the claim text.