System for disabling oximeter in presence of ambient light
US5282466A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 1991 |
| Grant date | Feb 1, 1994 |
| Priority date | — |
| Expiry date | Oct 3, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/1281
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for disabling an oximetric device when radiation-carrying channels are exposed to excess ambient radiation is disclosed. It includes a transmitter channel adjacent the sample to be measured, means for isolating the channel from the sample so that it does not carry radiation reflected from or transmitted through the sample, a detector for receiving the transmitted signal, if any, and means for disabling the output in response to the transmitted signal. Preferably, the transmitter channel runs parallel to other transmitter channels in the device, and is isolated from undue ambient light. The system preferably includes means for determining when the second transmitted signal exceeds background noise and the output is disabled when the second transmitted signal exceeds background noise. In general, the sample is a fluid, usually blood, passing through a cuvette adjacent the fiber-optic channels, the cuvette defining an area of radiation absorption adjacent the transmitter channel so that the transmitter does not carry reflected or transmitted radiation from the sample. Also disclosed is a fiber-optic sensor for measuring components of a composition by detecting transmitted or …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.