Fedora-Type Magnetic Compression Anastomosis Device For Intestinal Anastomosis

BACKGROUNDAlthough previous studies have confirmed the feasibility of magnetic compression anastomosis (MCA), there is still a risk of long-term anastomotic stenosis. For traditional MCA devices, a large device is associated with great pressure, and eventually increased leakage.AIMTo develop a novel MCA device to simultaneously meet the requirements of pressure and size.METHODSTraditional nummular MCA devices of all possible sizes were used to conduct ileac anastomosis in rats. The mean (+/- SD) circumference of the ileum was 13.34 +/- 0.12 mm. Based on short- and long-term follow-up results, we determined the appropriate pressure range and minimum size. Thereafter, we introduced a novel "fedora-type" MCA device, which entailed the use of a nummular magnet with a larger sheet metal.RESULTSWith traditional MCA devices, the anastomoses experienced stenosis and even closure during the long-term follow-up when the anastomat was smaller than phi 5 mm. However, the risk of leakage increased when it was larger than phi 4 mm. On comparison of the different designs, it was found that the "fedora-type" MCA device should be composed of a phi 4-mm nummular magnet with a phi 6-mm sheet metal.CONCLUSIONThe diameter of the MCA device should be greater than 120% of the enteric diameter. The novel "fedora-type" MCA device controls the pressure and optimizes the size.