First Fully Endoscopic End-to-End Colonic Anastomoses With a Novel Endoscopic Device: A Feasibility Study in a Porcine Model.

BACKGROUND Continuous advancements and breakthroughs in flexible gastrointestinal endoscopy have led to alternatives to colonic anastomosis. OBJECTIVE This study aimed to evaluate the feasibility and safety of end-to-end colonic anastomosis using a single flexible endoscope with the novel through-the-scope "bow-tie" (TTS-BT) device and conventional metal clips in a porcine model. DESIGN Animal study. SETTINGS Animal laboratory at China Medical University. PATIENTS Eight healthy pigs were included. INTERVENTIONS Eight animals underwent total colonic severance and anastomoses with through-the-scope "bow-tie" devices and metal clips. MAIN OUTCOME MEASURES The primary outcomes were the success rate of the anastomosis and survival rate during 3-month follow-up. Furthermore, the secondary outcomes were anastomotic site healing, reintervention rate, and rate of anastomotic complications such as bleeding, leakage, stenosis, and obstruction. Six pigs were euthanized, and necropsies were performed 3 months postoperatively, while two pigs were fed for long-term observation. The anastomotic stoma was histologically analyzed using Hematoxylin-eosin and Masson's trichrome staining. RESULTS End-to-end colonic anastomoses were successfully performed using through-the-scope "bow-tie" devices, and satisfactory healing was achieved in all pigs. The success rate of anastomosis was 100% (8/8). All animals survived postoperatively without anastomotic complications, including bleeding, leakage, or obstruction; however, two cases of stenosis occurred (25%), and one case (12.5%) required reintervention. LIMITATIONS Large-scale studies should be conducted to verify the feasibility and safety of the through-the-scope "bow-tie" device in other parts of the intestine. CONCLUSIONS Flexible endoscopy with the through-the-scope "bow-tie" device is feasible and safe for intraluminal colonic anastomosis. This study may expand the indications for full-thickness endoscopic resection in the future. See Video abstract.