Gas mixing device and gas analyzer making use of the same
US4905497A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1988 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | Jun 3, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87684
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A gas mixing device of a blood gas analyzer has a substrate made of a material such as silicon and a plate having a flat smooth surface, made of a material such as glass. The plate is bonded to the substrate. The substrate has a plurality of fine elongated grooves extending between inlet and outlet ports formed in the plate. Different gases are introduced through the respective inlet ports, and combined with each other in the gas mixing device. The levels of flow resistance in branch grooves are so determined that the different gases are mixed at predetermined mixing ratios for delivery to the outlet ports. Further, the analyzer includes the gas mixing device and a measuring unit equipped with a plurality of gas measuring electrodes. The mixture gas from the gas mixing device is made to bubble through a buffer solution in a reservoir for producing a standard liquid measuring unit that is delivered at predetermined time intervals to the analyzer for calibration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.