Methods and apparatus for physiological measurement using color band photoplethysmographic sensor
US10028669B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2015 |
| Grant date | Jul 24, 2018 |
| Priority date | — |
| Expiry date | Nov 11, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG16H30/40
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In illustrative implementations of this invention, a photoplethysmographic device measures variations of light that is reflected from, or transmitted through, human skin. In some implementations, the device includes a camera that takes the measurements remotely. In others, the device touches the skin during the measurements. The device includes a camera or other light sensor, which includes at least orange, green and cyan color channels. In some cases, such as a contact device, the device includes three or more colors of active light sources, including at least orange, green and cyan light sources. A computer analyzes the sensor data, in order to estimate a cardiac blood volume pulse wave. For each cardiac pulse, a computer detects the systolic peak and diastolic inflection of the wave, by calculating a second derivative of the wave. From the estimated wave, a computer estimates heart rate, heart rate variability and respiration rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.