Clinical study on application of covering method with polyglycolic acid sheet (Neoveil) and fibrin glue (Beriplast) for wounds after endoscopic submucosal dissection for colorectal tumors

Interventions: Covering ulcer bed made after colorectal ESD with Neoveil and Beriplast Primary outcome(s): The extent of remaining Neoveil on the ulcer bed 8 to 14 days after ESD Study Design: Single arm Non-randomized