System for measurement of oxygen uptake and respiratory quotient
US4197857A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 6, 1978 |
| Grant date | Apr 15, 1980 |
| Priority date | — |
| Expiry date | Apr 6, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/497
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for measuring the oxygen uptake and respiratory quotient of a patient which employs a high resistance gas flow path in parallel with a pneumotachograph. The high resistance path is connected to each side of the pneumotachograph and a small chamber is included in the high resistance path at each end thereof adjacent its connection to the pneumotachograph. The volume of the high resistance path, together with its resistance relative to that of the pneumotachograph is chosen such that, during respiration of the patient employing the device, the high resistance path will never be completely flushed through in one direction before flow starts in the opposite direction. The high reistance path is chosen to be a constant resistance such that the amount of flow therethrough is proportional to the flow through the pneumotachograph. Thus by sampling and analyzing a small portion of the gas of the two chambers and measuring the amount of gas flow by the pneumotachograph, the exact amount of oxygen uptake can be calculated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.