Light guide system for physiological sensor
US10485437B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2015 |
| Grant date | Nov 26, 2019 |
| Priority date | — |
| Expiry date | Apr 15, 2038 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2562/185
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A light guide system for a physiological sensor includes a light channel in optical communication with an emitter and a light channel in optical communication with a detector. The light channels are formed of a bio-compatible resilient plastic, such as a silicone, that is blended with a colorant. Each light channel has an optical transmission spectrum that passes the emitter spectral band and rejects most or all ambient light. The colorant can be a pigment provided as a suspension in a liquid or a dye provided in liquid form. The optical transmission spectrum defines a longpass optical filter where the shortest wavelength of the optical spectrum of the emitter is greater than the transition wavelength of the longpass optical filter. Each of the light channels is configured to be in contact with the skin, thereby reducing or eliminating optical loss due to transmission through an air gap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.