Transcutaneous pH measuring instrument
US4033330A · kind A · utility
106Cited by
10References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1975 |
| Grant date | Jul 5, 1977 |
| Priority date | — |
| Expiry date | Sep 8, 1995 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/14552
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A transcutaneous pH measuring device is provided in which a known volume of fluid is brought into equilibrium with body fluids through a membrane on a portion of skin whose surface layers have been stripped away. The fluid contains a pH sensitive dye. Optical measurements of the transmission characteristics of the fluid are obtained when the fluid is in the optical path. During portions of each operating cycle, the fluid is driven back into the vicinity of the skin to pH equilibrate with body fluids while standardization measurements are obtained using an optical plug of known transmission characteristics in the optical path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.