摘要目的:牵引方法可加快胃早期肿瘤超级微创非全层切除的速度，缩短术者的学习曲线，探讨采用组织夹-牙线可变角度牵引法作为胃肠早期肿瘤经内镜非全层切除过程中的牵引方法。方法:采用回顾性研究的方法，纳入2022年1月至2023年6月于解放军总医院第一医学中心开展的早期胃癌行超级微创病灶非全层切除术的18例患者，采用同级别专家进行操作，分为牵引组和非牵引组各9例，分别记录其黏膜下剥离时间（SDT）、黏膜下剥离速度（SDS）、术中固有肌层暴露、固有肌层缺损度分级（MPD）、术中出血量、整块切除、治愈性切除、手术费用及手术器械使用情况。结果:9例采用可变角度牵引法，9例未采用牵引法。两组整块切除率和治愈性切除率均为100%。牵引组SDT为28.00（21.00，34.00） min，非牵引组为56.00（40.00，85.00） min，差异有统计学意义（ P<0.05）；牵引组SDS为（0.58 ± 0.21） cm 2/min，非牵引组为（0.23 ± 0.10） cm 2/min，差异有统计学意义（ P<0.05）。牵引组固有肌层暴露8例，非牵引组6例；牵引组术中固有肌层损伤MPD-0级8例，MPD-Ft级1例；非牵引组MPD-0级4例，MPD-Pt级1例，MPD-Ft级4例。两组术中出血量、住院费用、手术费用和住院时间比较差异均无统计学意义（ P>0.05）。两组无严重不良事件发生。 结论:可变角度牵拉法加快了胃早癌非全层切除的SDT和SDS，固有肌层与黏膜层充分分离，剥离深度更深，固有肌层损伤率低，术中出血量少，未增加医疗费用，该方法可以成为超级微创手术的辅助治疗技术。

abstractsObjective:Assisted traction technology is effective in increasing the rate of super minimally invasive surgery (SMIS) in patients with early gastric cancer (EGC), and shortening the operator′s learning curve. We adopt the variable angle traction technique of tissue clamp dental floss as a traction technique in this research.Methods:Patients with early gastric cancer who were treated with SMIS - non full layer resection of EGC were enrolled in the First Medical Center of Chinese PLA General Hospital from January 2022 to June 2023. This research was carried out by experts at the same level. It was divided into two groups: traction and non-traction. Submucosal detachment time (SDT), submucosal detachment rate (SDS), lamina propria exposure, muscularis propria defect (MPD), bleeding during operation, block resection, surgical resection, hand operation expenses, and surgical instruments were recorded.Results:Nine patients adopted variable angle traction, and 9 patients did not. The overall resection rate and curative resection rate of both groups were 100%. The mean SDT time was 28.00 (21.00, 34.00) min in traction group and 56.00 (40.00, 85.00) min in non traction group. And it had statistical significance ( P = 0.005). The SDS was (0.58 ± 0.21) cm 2/min in traction group and (0.23 ± 0.10) cm 2/min in non-traction group. And it had statistical significance ( P<0.05). Exposure of intrinsic muscle layer (IML): 8 cases in the traction group and 6 cases in the non-traction group. Intraoperative IML injury: in the traction group, 8 cases were MPD-0 and 1 case was MPD-Ft; in the non-traction group, 4 cases were MPD-0, 1 case was MPD-Pt, and 4 cases were MPD-Ft. There was no statistical difference between the two groups in terms of intraoperative bleeding, hospitalization expenses, surgical expenses, and the total hospitalization time. There were no serious adverse reactions or outcomes. Conclusions:The variable angle traction method accelerates SDT and SDS for SMIS-non full layer resection of EGC. It has the advantages of the sufficient separation of IML and mucosal layer, the deeper dissection depth, the low injury of IML, low intraoperative bleeding, and no additional medical costs. Therefore, this method can become an auxiliary treatment technology for SMIS.