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A novel mainstream capnometer system for endoscopy delivering oxygen

Capnometry is a method to measure carbon dioxide (CO2) in exhaled gas and it has been used in patients to monitor their respiratory status. Monitoring of exhaled CO2 during endoscopic procedures has been shown to be effective in detecting drug-induced respiratory depression. Oxygen (O2) supplementation is given to patients to abolish hypoxia during endoscopy. However, oxygen administration can interfere with CO2 measurement owing to oxygen flow. Therefore, we developed cap-ONE Biteblock for patients undergoing endoscopy with oxygen supply to measure CO2 accurately. In this study we evaluated the basic performance of cap-ONE Biteblock. The cap-ONE Biteblock system could accurately measure CO2 and efficiently supply O2 comparing to conventional devices via a bench study.