Objective To evaluate the effect of plastic operation of ampulla after anterior resection for low rectal carcinoma.

目的评价直肠壶腹成形术在低位直肠癌前切除术中对改善患者排便功能的作用。

Purpose:To measure the length of distal margin from the lower border of tumor at different time in anterior resection for rectal cancer and analyze their relationship.

目的：研究直肠癌前切除术肿瘤下切缘的长度在不同时间的变化及其规律。

Objective To study the effect and feasibility of stapling technique on anterior resection of rectum on patients with middle of low position rectal cancer.

目的探讨吻合器技术在中低位直肠癌行直肠前切除术中的应用价值及可行性。