Fig. 1. Diverticuloscopes with painted distal flaps. (A) Constructed in house. (B) Commercial type.

Fig. 2. Endoscopic cricopharyngeal myotomy with a needle-knife sphincterotome. Guiding catheter (arrows) placed before myotomy, shows esophageal lumen. (A) Diverticuloscope placed on diverticular bridge for cutting. (B) Single midline incision of septum in cranio-caudal direction at start of myotomy. (C, D) Endoscopic view of septum cut with needle-knife sphincterotome. (E) Endoscopic view after myotomy completion. (F) Clips positioned at the distal aspect of septotomy at end of procedure.

Fig. 3. Catheter marked to measure diverticulum cut depth.

Graphical abstract