Water absorbing trap to protect an infrared exhaled carbon dioxide apnea monitor of a patient's respiration
US4446869A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 7, 1983 |
| Grant date | May 8, 1984 |
| Priority date | — |
| Expiry date | Mar 7, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/309
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A water trap is connected to a cannula which has a substantially constant internal diameter and which communicates moisture laden patient exhalations therethrough to an analyzer. The trap includes a body having a recess adapted for receiving a water absorbing compound which has an aperture therethrough for communicating dried exhalations to the analyzer. A second recess in the body is adapted for receiving another water adsorbing compound which similarly has an aperture of same diameter. When the first compound becomes substantially saturated and thereby permits moisture laden exhalations to pass therethrough, then the second compound absorbs those exhalations and swells for thereby closing its aperture and preventing communication of moisture laden exhalations to the analyzer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.