Method for evaluating contact pressure between an optical sensor and a user's skin and associated device

By comparing optical signals at different wavelengths to evaluate contact pressure, the method improves the accuracy of wearable devices' physiological measurements by adjusting the sensor's fit, addressing issues of poor positioning and excessive pressure.

FR3134707B1Active Publication Date: 2026-05-22WITHINGS SAS
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Patent Information

Authority / Receiving Office
FR · FR
Patent Type
Patents
Current Assignee / Owner
WITHINGS SAS
Filing Date
2022-04-25
Publication Date
2026-05-22

AI Technical Summary

Technical Problem

Existing wearable devices with optical sensors, such as smartwatches, face challenges in accurately measuring blood circulation due to improper positioning, which leads to poor-quality PPG measurements, often caused by excessive contact pressure that displaces blood from superficial vessels, affecting the quality of optical signals.

Method used

A method and device that utilize optical signals at different wavelengths to evaluate contact pressure by comparing optical data obtained from green and red or green and infrared ranges, calculating a vascular parameter, and adjusting the sensor's position based on this evaluation to ensure optimal contact pressure.

Benefits of technology

The method enhances the robustness of optical signal quality by normalizing variations in contact pressure, reducing the influence of external factors, and providing user notifications to adjust the device's fit, thereby improving the accuracy of physiological measurements like heart rate and blood oxygen saturation.

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Abstract

The invention relates in particular to a method for evaluating contact pressure between an optical sensor and a user's skin, the method comprising: a) determining (502) first optical data, using a first optical signal obtained by the optical sensor at a first wavelength; b) determining (504) second optical data, using a second optical signal obtained by the optical sensor at a second wavelength, different from the first wavelength; c) analyzing (506) at least one comparison of the first optical data with the second optical data, the analysis generating information relating to the contact pressure between the optical sensor and the skin. Figure for the abstract: Figure 5
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