Anesthesia machine having proportion limiting control system
US4266573A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 19, 1979 |
| Grant date | May 12, 1981 |
| Priority date | — |
| Expiry date | Oct 19, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87692
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A system is disclosed for providing an interconnection between two needle valves such that movement of either needle valve, in opening or closing thereof, is affected or limited by movement of the other valve. The invention is particularly suited to an anesthesia machine wherein separate supplies of oxygen (O.sub.2) and nitrous oxide (N.sub.2 O) are fed to individual needle valves which are then individually adjusted to provide a desired mixture of N.sub.2 O and O.sub.2 for administration to a patient to anesthetize the same. The system herein disclosed interconnects the individual needle valves such that the O.sub.2 needle valve may be opened fully without restriction, however, when the N.sub.2 O valve is open, the interconnection provides that closing of the O.sub.2 valve will, at a predetermined point, also correspondingly close the N.sub.2 O valve, thus preventing the percentage of N.sub.2 O in the mixed gas from raising above a set value, i.e. one at which sufficient oxygen for a respirable mixture is assured. Similarly, the N.sub.2 O valve is prevented, through the same interlock system, from being opened beyond a point where the N.sub.2 O percentage could exceed such limit. …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.