Shutterless mainstream discriminating anesthetic agent analyzer
US5296706A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1992 |
| Grant date | Mar 22, 1994 |
| Priority date | — |
| Expiry date | Dec 2, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/3166
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An anesthetic agent analyzer having six or more independent analytical channels, where each channel comprises a first thermopile which receives incident infrared radiation and a second thermopile behind the first thermopile which is blocked from the incident infrared radiation and thus serves as a reference for detecting ambient temperature variations. The first and second thermopiles are connected in a "parallel opposed" fashion so that the effects of ambient temperature variations automatically cancel and the detectors may be readily configured in a detector package. The anesthetic agent analyzer of the invention is designed for use with a wideband infrared radiation source so that anesthetic agents having characteristic absorption bands in the far infrared wavelength range (6-15 microns) may be more readily detected and discriminated. When implemented in a mainstream configuration, a disposable airway adapter with windows formed of polypropylene or some other suitable window material which minimally attenuates the infrared energy at the wavelengths of interest is also used. The concentrations of the discriminated anesthetic agent gases are then calculated using a second order po…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.