Device for indicating the presence of carbon dioxide in a patient's exhaled air
US5468451A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 10, 1994 |
| Grant date | Nov 21, 1995 |
| Priority date | — |
| Expiry date | Feb 10, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/584
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for indicating the presence of CO.sub.2 in a patient's inhaled air comprises a CO.sub.2 detector including an indicator element (14) which undergoes a reversible color change in response to exposure thereof to air containing CO.sub.2 in concentrations of the same order of magnitude as the CO.sub.2 concentration of air exhaled by a human being, and also comprises a heat-moisture exchanger (12) including a housing (13) with a first connecting port (15) adapted to be connected to the trachea of a patient, and a second connecting port (15) adapted for connection to a ventilator or an anesthetic machine, for example. In a flow-through passage (P) extending between the connecting ports (15, 16) there is mounted an element (18) for the regenerative exchange of heat and moisture between, on the one hand, air flowing through the flow-through passage (P) in one direction and, on the other hand, air flowing through the flow-through passage (P) in the opposite direction. The indicator element (14) is disposed in the flow-through passage on the side of the heat-moisture exchanger element (18) remote from the first connecting port (15) and is viewable from outside the housing, and its r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.