<p>Large colonic perforations rarely occur during endoscopic diagnosis and treatment; however, when they do occur, they may require additional surgery and may lead to medical disputes, posing challenges for physicians and increasing the burden on patients. If a perforation can be closed endoscopically with clips, these burdens and conflicts may be reduced. However, owing to the geometric limitations of conventional clips, perforations exceeding a certain size are difficult to manage. In large perforations, the distance between the opposing tissue edges is often too great to allow closure with conventional clips. In this study, we propose a method in which a permanent magnet is added to a conventional endoscopic clip. The magnetic force generated between two such clips draw the opposing edges of the perforation closer together, thereby reducing the gap between them. Once the distance is sufficiently reduced, the perforation can be closed using conventional clips. The device can be inserted through the working channel of an endoscope and can exert a magnetic traction force of at least 0.8 N on the surrounding tissue. To increase the traction force, a magnetic configuration incorporating a yoke and magnet was designed based on a finite element magnetic field analysis. To evaluate the effectiveness of the device, gastroenterologists conducted experiments using an in vitro swine colon model. The results confirmed that large perforations exceeding 15 mm in diameter can be narrowed by magnetic traction. After traction, conventional endoscopic clips were used for suturing. This device should improve procedural convenience for physicians and facilitate patient recovery by enabling the endoscopic management of large perforations during diagnostic and therapeutic procedures.</p>