pH electrode
US5354449A · kind A · utility
335Cited by
6References
14Claims
0Family size
Inventors
Key dates
| Filing date | Oct 13, 1992 |
| Grant date | Oct 11, 1994 |
| Priority date | — |
| Expiry date | Oct 13, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/3335
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pH electrode suitable for in vivo use is provided in a cannula 10, and comprises a reference electrode 14 consisting of a chloridized silver wire surrounded by a solid unbuffered internal reference material 16 comprising potassium chloride, silver chloride, citric acid and sorbitol as a hygroscopic agent. The material 16 is surrounded by a PVC sleeve 12. The tip of the cannula 10 has a pH sensitive polymer-based membrane 20 across its end. The reference material has a pH when hydrated of about 2 which is below the range of pH response of the membrane 20.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.