ADPJ(piezo actuator-driven pulsed water jet) developments assuming using under endoscopes

Abstract

Object. ADPJ (piezo actuator-driven pulsed water jet) is intended to achieve both maximal lesion resection and functional maintenance through preservation of fine vessels and minimal surrounding damage. We have study with short-straight-nozzle, but, I'm studying with long-flexible nozzle (=catheter) for using under flexible endoscopes. The present study evaluated the change of pulsed water jet under catheterMethods. First, engineering experiment, I measured pulsed water jet speeds(=jet speeds) with a high speed camera, changing the catheter length, inner diameter and bending. Second, Phantom model experiment, I used a gelatin as a phantom model. I cut it moving at constant speed with ADPJ and measured the depth of the excision, changing the catheter length. Results. jet speeds and the excision depth decreased depending on the length of catheter. The graph of Inner diameter-jet speeds peaked at one point. Bending had less effects on jet speeds than length and inner diameter.