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US 2020/0368432 A1Published application
System and method of a biosensor for detection of vasodilation
AssigneeSanmina Corporation
InventorsRobert Steven Newberry, Matthew Rodencal
Life of this patent
Estimating the term…
Abstract
An optical circuit detects PPG signals reflected from skin tissue at one or more different wavelengths. A processing circuit integrated in the biosensor or in communication with the biosensor processes the PPG signals to obtain a period of vasodilation, a level of vasodilation and rate of change of the level of vasodilation. The processing circuit compares the level of vasodilation to a normal range and determines an arterial stiffness index using the comparison and the rate of change of the level of vasodilation.
Claims20
A device, comprising:
- an optical circuit configured to:
- detect a plurality of photoplethysmography (PPG) signals over a measurement period, wherein the plurality of PPG signals include at least a first PPG signal obtained from light at a first wavelength reflected from or transmitted through skin tissue of a user and a second PPG signal obtained from light at a second wavelength reflected from or transmitted through skin tissue of a user;
- and
- at least one processing device configured to:
- determine at least one vasodilation period using one or more of the first PPG signal or the second PPG signal detected over the measurement period;
- determine a level of vasodilation or vasoconstriction during the vasodilation period using the first PPG signal and the second PPG signal;
- compare the level of vasodilation or vasoconstriction to a normal range of levels, wherein the normal range of levels is determined using PPG signals from healthy users in a general sample population;
- and
- determine an arterial stiffness index using the comparison.
6 more elements
A device, comprising:
- an optical circuit configured to:
- detect a plurality of photoplethysmography (PPG) signals over a measurement period, wherein the plurality of PPG signals include at least a first PPG signal obtained from light at a first wavelength reflected from or transmitted through skin tissue of a user and a second PPG signal obtained from light at a second wavelength reflected from or transmitted through skin tissue of a user;
- and
- at least one processing device configured to:
- determine an R value using the first PPG signal and the second PPG signal detected during the measurement period, wherein the R value is determined using a ratio of an AC component of the first PPG signal and an AC component of the second PPG signal;
- determine a level of vasodilation or vasoconstriction during a vasodilation period using the R value;
- compare the level of vasodilation or vasoconstriction to a normal range of levels, wherein the normal range of levels is determined using PPG signals from healthy users in a general sample population;
- and
- determine an arterial stiffness index using the comparison.
6 more elements
A device, comprising:
- an optical circuit configured to:
- detect a plurality of photoplethysmography (PPG) signals over a measurement period, wherein the plurality of PPG signals include at least a first PPG signal obtained from light at a first wavelength reflected from or transmitted through skin tissue of a user and a second PPG signal obtained from light at a second wavelength reflected from or transmitted through skin tissue of a user;
- and
- at least one processing device configured to:
- determine at least one vasodilation period using one or more of the first PPG signal or the second PPG signal detected during the measurement period;
- determine a level of vasodilation or vasoconstriction during the at least one vasodilation period using the first PPG signal and the second PPG signal;
- determine a rate of change of the level of vasodilation or vasoconstriction during the vasodilation period;
- and
- determine an arterial stiffness index using the rate of change of the level of vasodilation or vasoconstriction during the vasodilation period.
6 more elements
Dependencies are inferred from the claim text.