Reliability-enhanced apparatus operation for re-breathing...

Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure

Reexamination Certificate

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Details

C128S204180, C128S205230

Reexamination Certificate

active

07066176

ABSTRACT:
Methods and apparatus for enhancing reliability of, and monitoring, the operation of airway valves to enhance patient safety. Pneumatic control line pressure (positive or negative) for actuation of the airway valve may be specified at a given magnitude or within a selected range and monitored continuously. Reduced or excessive pressure may be compensated by actuation of a pressure source or a bleed valve, and monitoring may be effected so as to warn the user of any deviation from the range, or deviations of selected magnitudes or frequencies or a combination thereof. The inspired volume of CO2may be monitored using air flow and CO2sensing, with detection of excessive CO2volume triggering a warning. Similarly, measured end-tidal or end-inspired CO2or other appropriate measures of CO2concentration may be employed as a warning trigger. Other driving energy sources for airway valves, and monitoring thereof, are also disclosed.

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PCT Written Opinion of Feb. 28, 2001.
PCT International Search Report dated Feb. 10, 2000.

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