A novel method to prevent catheter dysfunction during spray cryotherapy

This letter provides data that the insufflation of CO2 gas in an endoscope working channel as depicted in Visrodia et al1 reduces the ablation power of truFreeze spray cryotherapy. An Olympus UCR insufflator routed CO2 through the vacuum fitting of an Olympus GIF-140 gastroscope into the 2.8-mm working channel alongside the truFreeze delivery catheter. Power (Fig. 1A) measured by the use of validated test tools with a 1.4-standard liters per minute (SLPM) CO2 flow rate revealed a significant drop of 64%.

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