Simethicone Crystallization in a Colonoscope Water Jet Channel

In the current report from the Netherlands, a group using Fujinon colonoscopes and silicone in the water jet noticed crystalline deposits inside a water jet channel connector which had broken off a colonoscope. Subsequently, it was shown that there were crystal deposits throughout the length of the water jet, which could not be washed off with warm water, peracetic acid, or precleaning detergent. Chemical analysis showed the crystals were made of simethicone.