Newly developed endoscopic retrieval device: funnel-shaped overtube formed by air inflation-deflation.

Techniques for endoscopic retrieval require further development. Traditional measures using nets, grasping forceps, and overtubes [1] are sometimes inadequate for retrieval of large, endoscopically resected specimens or sharp foreign bodies with a potential risk of perforation. Although new alternatives include plastic [2], laparoscopic [3], and commercially available bags [4], reliable retrieval of solid gastrointestinal mesenchymal tumors (GIMTs) during endoscopic full-thickness resection is still being investigated. Based on our previously published concept [5], we have developed a novel retrieval device, a funnel-shaped overtube formed by air inflation–deflation (Fuji Systems, Tokyo, Japan). We here report a successful animal experiment in which the device achieved retrieval of press-through package (PTP) sheets and simulated gastric GIMTs ([Video 1]).