Novel deformable self-assembled magnetic anastomosis ring for endoscopic treatment of colonic stenosis via natural orifice

Figure 1 A schematic of the deformable self-assembled magnetic anastomosis ring. A: Transformation of the deformable self-assembled magnetic anastomosis ring from a linear structure to a ring; B to D: Computer simulation of magnetic flux density. DSAMAR: Deformable self-assembled magnetic anastomosis ring.

Figure 2 Colonic stenosis model. A: Colonic stenosis as seen by colonography; B: Colonic stenosis as seen by colonoscopy.

Figure 3 Animal experiment process. A: Hard guide wire passes through the stenosis into the proximal colon; B: Linear deformable self-assembled magnetic anastomosis ring (DSAMAR) passes through the narrow segment of the colon; C: DSAMAR enters the proximal colon completely; D: Magnetic rings at both ends of the narrow colon were attracted to each other; E: DSAMAR in the distal colon as seen by colonoscopy.

Figure 4 Magnetic compression anastomosis was established. A to C: Deformable self-assembled magnetic anastomosis rings expelled from the body; D: Magnetic compression anastomosis as seen by colonoscopy; E: Colonography showed good patency of the colon.

Figure 5 Magnetic compression anastomosis specimen. A: Serous surface of the anastomosis; B: Colonic anastomosis seen on mucosal surface; C: Masson’s staining of anastomosis; D: Hematoxylin and eosin staining of anastomosis.