Objective. The purposes of the study are to compare the bariatric results of the stapleless and stapler single-anastomotic gastric bypass surgery for morbid obesity and assess the likelihood of complications. Material and methods. This randomized controlled clinical trial analyzed the long-term results of 80 patients with morbid obesity, divided into two groups. In the first (main) group of 40 patients, the authors stapleless modification of mini-gastric shunting with the creation of a small ventricle by tightly compressing the stomach with an adjustable gastric bandage was used. In the second (control) group of 40 patients, antireflux modification of mini-gastric shunting using EndoGIA staplers for dissection and stitching of the walls of the stomach was used. Results. In both groups there was no lethality and inconsistency of the sutures. The volume of blood loss with stapleless technology in the first group was 5.85±8.0 ml vs. 31.12±30.51 in the second group (p=0.001). Most often, biliary reflux was observed in the group where a linear stapler was used to create gastroenteroanastomosis: 7 (8.75%) cases vs. 1 (1.25%) in the stapleless group where the anastomosis was performed using a double-row manual suture. In contrast to the main group, in the control group, in 4 cases re-operations were required: due to the occurrence of severe biliary reflux — 2 cases, intra-abdominal bleeding — 1 case, unsatisfactory loss of body weight — 1 case. The percentage of total weight loss was better in the main group, where it was 34.06±9.03% vs. 29.27±10.59% in the control group (p=0.03). Conclusion. Comparison of the results on weight loss indicates a greater bariatric effect after stapleless laparoscopic gastroshunting with morbid obesity against the standard stapler method. The likelihood of complications when using a mechanical staple joint to create a gastric pouch and gastroenteroanastomosis is higher compared to the developed stapleless technology.