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.