Endoscopic ultrasonic examination for diagnosis of malignant tumors of a lower-ampullar part of the rectum determined indications to inter-sphincter resection consisting in total mesorectumectomy, resection of the rectum and internal sphincter. The method of creation of a globe-shape reservoir with artificial muscular sphincter was developed. Fourteen patients underwent surgery, the follow-up was up to 3,5 years. It is demonstrated that a globe-shape extensible reservoir and autonomic bloching function of muscular sphincter are the main conditions of repair of defecation functions in long-term period after inter-sphincter resection.