A novel robotic traction system for endoscopic submucosal dissection – achieving en bloc resection of an extensive laterally spreading tumor in the lower rectum

Abstract

A novel robotic traction system for endoscopic submucosal dissection achieving en bloc resection of an extensive laterally spreading tumor in the lower rectum Colonoscopy revealed a 5.5 4.0 cm laterally spreading tumor in the lower rectum near the anal verge, with a welldemarcated line and relatively regular nodules ( Fig. 1).Indigo carmine staining displayed a glandular pattern consistent with Kudo type IV pits ( Fig. 2), and endoscopic submucosal dissection (ESD) was deemed feasible.Given the lesion's large size, location in the lower rectum, and rich vascularity, submucosal layer visualization was expected to be suboptimal during dissection, elevating the risks of intraoperative bleeding and incomplete resection.To overcome these challenges, the Endo-Faster robotic traction system was employed ( Fig. 3).Following submucosal injection and circumferential mucosa incision using a hybrid knife, the device's white soft hood was attached to the endoscope tip.Grasping forceps were fixed at the 12 o'clock direction to grasp the lesion edge, providing upward traction.The submucosal layer was in full exposure and blood vessels were clearly visible ( Fig. 4).The operation progressed with an antegrade approach from the anal to the oral side.By dynamically adjusting the position of the forceps, they can exert a controlled pulling force in multiple directions, which allowed precise electrocoagulation hemostasis and systematic dissection.Finally, the lesion was successfully completely removed ( Fig. 5).The total duration of the submucosal dissection was significantly reduced to approximately 30 minutes, with no intraoperative complications ( Video 1).Compared with conventional traction methods (e. g. dental floss [1, 2] and figure-of-eight clip [3,4]), EndoFaster enables multiple-position and multipleangle traction due to its flexibility, which improves dissection efficiency for large lesions in anatomically challenging loca-E-Videos Fig. 1 A laterally spreading tumor (5.5 cm 4.0 cm) with Parisian Type 0-IIa in the lower rectum. Fig. 2 Indigo carmine staining dis- played a glandular pattern consistent with Kudo type IV pits. Fig. 3 The scheme of the EndoFaster robotic traction system. Fig. 4 With robot-assisted traction, the submucosal layer was in full exposure (left) and blood vessels were clearly visible (right).