Double stapling technique
The application of stapler in colorectal anastomosis makes the surgery more reliable, faster and safer than classical anastomosis. However, purse need to be sewed in stump rectum when general stapler is used. In case that patients is fat, patientsí» pelvis is narrow or stump rectum is so short that it retracts to the depth of pelvis, the operation to sew purse is very difficult, sometimes impossible, even with purse-string forceps. Doctor Knight and doctor Griffen firstly introduced double stapling technique in 1980. Linear stapler, one of them, was developed to overcome the above shortcoming. It changed manually sewing purse into onetime suture with instruments in stump rectum operation, which makes the operation simple, convenient and more reliable, and lower to reach anus. Consequently, the introduction of curved cutter stapler overcame the shortcomings of linear stapler. The curved cutter stapler is 40mm in arc length and 30mm in linear length, so it may complete 40mm length of tissue anastomosis in 30 mm of narrow room in pelvic floor. Also, it completes cutting and suture at the same time, which decreases risk of contamination, and thus avoids the difficultly that linear stapler must cut rectum in narrow room and the possibility of the resultant injury. The design complies with the natural anatomy of pelvic cavity and is easy to insert in lower site, which makes low anastomosis more feasible.