Anesthetic gas detection apparatus
US6277081A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 1999 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | May 18, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/3504
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus is provided for detecting each of the five known anesthetic agents, CO.sub.2, and N.sub.2 O when monitoring a patient's respiratory gas stream during anesthesia. A source of infrared radiation emits the infrared tight through a gas stream and onto the infrared detector/sensor. The detector may contain ten analytical channels, each channel containing an independent infrared detector and a specific bandpass infrared filter which only permits certain wavelengths of the infrared radiation to reach the respective infrared detector. One of the channels is a blocked detector which serves as the reference point. A calibration and processing means is also provided to compensate for factors such as offset voltage, cross coupling, wideband changes and thermal drifts which may affect the accuracy of the gas measurements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.