Rectal Tumor Resection Using the UNI-VEC Multichannel Transanal Access Device

Inclusion Criteria: * All polyps included in the Paris Classification (Polypoid (0-I): Sessile type (Is), Pedunculated type (Ip), Non-polypoid (0-II, III): Raised type (IIa), Flat type (IIb), Depressed type (IIc), Excavated type (III)) * Lesions located from the anal margin to about 20 cm. * Extent of at least 2 cm² (polyps 2 cm in diameter or areas of ERM or ESD 2 x 2 cm). * Well or moderately differentiated tumours. T1: Tumours confined to the mucosa (Tis) and submucosa (T1). * No positive lymph nodes. * No lymphatic, vascular or perineural invasion. Exclusion Criteria: * Are considered vulnerable subjects. * They suffer from hematological diseases with altered coagulation of their own or pharmacologically induced coagulation disorders (the use of acetylsalicylic acid (ASA) in doses of 150 mg/day is permitted). * Have rectal lesions that lie above the pectineal line or extend into the anal canal. * Local or distant metastasis. * Have a score of more than 2 points on the Wexner faecal incontinence scale.