Carbon dioxide monitor
Abstract
Abstract A MONITOR FOR CONTINUOUSLY MEASURING THE PARTIAL PRESSURE OF CO2 IN A STREAM OF INTRAVENOUS LIQUID INCLUDES AN ION SENSITIVE ELECTRODE HAVING A BICARBONATE BUFFER SOLUTION. THE ELECTRODE IS POSITIONED IN A SAMPLING CAVITY WHICH IS MAINTAINED CONTINUOUSLY FULL OF THE INTRAVENOUS LIQUID WHICH IS TO BE MONITORED AND THE BUFFER SOLUTION IS SEPAREATED FROM THE CAVITY BY A SEMIPERMEABLE TEFLON MEMBRANE. A SAMPLING STREAM OF THE LIQUID IS DIRECTED INTO THE BODY OF LIQUID IN THE CAVITY AND AGAINST THE MEMBRANE AND AT LEAST A PORTION OF THE CO2 IN THE STREAM PASSES THROUGH THE MEMBRANE TO VARY THE PH OF THE BUFFER SOLUTION AS A FUNCTION OF THE PARTIAL PRESSURE OF THE CO2 IN THE SAMPLE STREAM. THE CHANGE IN PH IS MEASURE TO PROVIDE AN INDICATION OF THE PARTIAL PRESSURE IN THE SAMPLE. CALIBRATION OF THE MONITOR IS EFFECTED BY DRAINING THE CHAMBER AND EXPOSING THE MEMBRANE TO A NEBULIZED GASEOUS MIXTURE OF THE LIQUID AND A STANDARD CO2 OF A KNOWN PARTIAL PRESSURE.
Inventors
- 👤 Otho K Mcfarland
- 👤 George M Illich Jr
- 👤 Wilfred C Ling
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |