Experimental application of pulsed laser‐induced water jet for endoscopic submucosal dissection: Mechanical investigation and preliminary experiment in swine. Issue 3 (19th September 2012)

• Record Type: Journal Article
• Authors: Sato, Chiaki; Nakano, Toru; Nakagawa, Atsuhiro; Yamada, Masato; Yamamoto, Hiroaki; Kamei, Takashi; Miyata, Go; Sato, Akira; Fujishima, Fumiyoshi; Nakai, Masaaki; Niinomi, Mitsuo; Takayama, Kazuyoshi; Tominaga, Teiji; Satomi, Susumu
• Is Part Of: Digestive endoscopy. Volume 25:Issue 3(2013:May)
• Page Start: 255
• Page End: 263
• Publication Date: 2012-09-19
• Subjects: Digestive organs -- Diseases -- Periodicals; Digestive organs -- Diseases -- Diagnosis -- Periodicals; Endoscopy -- Periodicals; Digestive System Diseases -- diagnosis -- Periodicals; Digestive System Diseases -- therapy -- Periodicals; Endoscopy -- Periodicals; 616.3
• DOI: 10.1111/j.1443-1661.2012.01375.x
• Languages: English
• ISSNs: 0915-5635

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="den1375-sec-0001" sec-type="section"> <title>Background and Aim</title> <p>A current drawback of endoscopic submucosal dissection (ESD) for early‐stage gastrointestinal tumors is the lack of instruments that can safely assist with this procedure. We have developed a pulsed jet device that can be incorporated into a gastrointestinal endoscope. Here, we investigated the mechanical profile of the pulsed jet device and demonstrated the usefulness of this instrument in esophageal ESD in swine.</p> </sec> <sec id="den1375-sec-0002" sec-type="section"> <title>Methods</title> <p>The device comprises a 5‐Fr catheter, a 14‐mm long stainless steel tube for generating the pulsed water jet, a nozzle and an optical quartz fiber. The pulsed water jet was generated at pulse rates of 3 Hz by irradiating the physiological saline (4°C) within the stainless steel tube with an holmium‐doped yttrium‐aluminum‐garnet (Ho:YAG) laser at 1.1 J/pulse. Mechanical characteristics were evaluated using a force meter. The device was used only for the part of submucosal dissection in the swine ESD model. Tissues removed using the pulsed jet device and a conventional electrocautery device, and the esophagus, were histologically examined to assess thermal damage.</p> </sec> <sec id="den1375-sec-0003" sec-type="section"> <title>Results</title> <p>The peak impact force was observed at a stand‐off distance of 40 mm (1.1 J/pulse). ESD using the pulsed jet device was successful, as the tissue specimens showed precise dissection of the submucosal layer. The extent of thermal injury was significantly lower in the dissected bed using the pulsed jet device.</p> </sec> <sec id="den1375-sec-0004" sec-type="section"> <title>Conclusion</title> <p>The results showed that the present endoscopic pulsed jet system is a useful alternative for a safe ESD with minimum tissue injury.</p> </sec> </abstract>