UNOBTRUSIVE SKIN TISSUE HYDRATION DETERMINING DEVICE AND RELATED METHOD
First Claim
1. An unobtrusive PPG monitoring device for determining a hydration state of skin tissue, the device comprising:
- an interface for receiving a data stream comprising a plurality of PPG signals including at least a first PPG signal indicative of a first wavelength range, a second PPG signal indicative of a second wavelength range, and a third PPG signal indicative of a third wavelength range,a processing unit for computing at least a first combined signal based on a first pair of signals selected from the plurality of PPG signals, and a second combined signal based on a second pair of signals selected from the plurality of PPG signals, wherein at least one PPG signal of the first or second combined signal is dependent on a tissue hydration level and considerably sensitive to water deposition in the monitored skin tissue, and the PPG signals of the other combined signal are insensitive to water deposition in the monitored skin tissue;
an analysis unit for computing a hydration signal indicative of skin hydration, wherein the hydration signal is derived from the first combined signal and the second combined signal.
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Abstract
The present disclosure relates to a method and a device (10) for determining a hydration state of skin tissue. The device (10) comprises an interface (22) for receiving a data stream (100) comprising a plurality of PPG signals including at least a first PPG signal (104) indicative of a first wavelength range (72), a second PPG signal (106) indicative of a second wavelength range (74), and a third PPG signal (108) indicative of a third wavelength range (76), a processing unit (24) for computing at least a first combined signal (116) based on a first pair of signals (104, 106) selected from the plurality of PPG signals, and a second combined signal (118) based on a second pair of signals (108, 110) selected from the plurality of PPG signals, wherein at least one PPG signal of the second combined signal (118) is dependent on a tissue hydration level, and an analysis unit (26) for computing a hydration signal (34) indicative of skin hydration, wherein the hydration signal (34) is derived from the first combined signal (116) and the second combined signal (118).
36 Citations
15 Claims
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1. An unobtrusive PPG monitoring device for determining a hydration state of skin tissue, the device comprising:
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an interface for receiving a data stream comprising a plurality of PPG signals including at least a first PPG signal indicative of a first wavelength range, a second PPG signal indicative of a second wavelength range, and a third PPG signal indicative of a third wavelength range, a processing unit for computing at least a first combined signal based on a first pair of signals selected from the plurality of PPG signals, and a second combined signal based on a second pair of signals selected from the plurality of PPG signals, wherein at least one PPG signal of the first or second combined signal is dependent on a tissue hydration level and considerably sensitive to water deposition in the monitored skin tissue, and the PPG signals of the other combined signal are insensitive to water deposition in the monitored skin tissue; an analysis unit for computing a hydration signal indicative of skin hydration, wherein the hydration signal is derived from the first combined signal and the second combined signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An unobtrusive PPG monitoring method for determining a hydration state of skin tissue, the method comprising the following steps:
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receiving a data stream comprising a plurality of PPG signals including at least a first PPG signal indicative of a first wavelength range, a second PPG signal indicative of a second wavelength range, and a third PPG signal indicative of a third wavelength range, computing at least a first combined signal based on a first pair of signals selected from the plurality of PPG signals, and a second combined signal based on a second pair of signals selected from the plurality of PPG signals, wherein at least one PPG signal of the first or second combined signal is dependent on a tissue hydration level and considerably sensitive to water deposition in the monitored skin tissue, and the PPG signals of the other combined signal are insensitive to water deposition in the monitored skin tissue; computing a hydration signal indicative of skin hydration, wherein the hydration signal is derived from the first combined signal and the second combined signal. - View Dependent Claims (15)
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Specification