Carbon dioxide indicator
US5124129A · kind A · utility
52Cited by
18References
59Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1990 |
| Grant date | Jun 23, 1992 |
| Priority date | — |
| Expiry date | Jan 29, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/204998
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A carbon dioxide indicator for use in determining the proper placement of endotracheal tubes. The indicator is comprised of a pH-sensitive dye suspended in a predominantly hydrophilic polymer matrix. The indicator may be placed inside a tube or connector to form an indicator device. When the pH-sensitive dye changes color due to CO.sub.2 and moisture in exhaled air, the color change is visible from outside the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.