Instruments and methods for forming anastomosis

An instrument for forming an anastomosis between first and second body cavity wall sections, the instrument comprising a coil implant (10) comprising an elongate tubular member (16) made of a shape memory material, the elongate member self-expanding from a drafted stowed state for introduction into the body to an implanted configuration, wherein a first portion (12) of the elongate member forms at least a first loop (20) of a coil, a second portion (14) of the elongate member forms at least a second loop (22) of a coil, the elongate member comprising at least one internal cavity, the coil implant further comprising a plurality of magnets (24) carried by the first and second portions of the elongate member, each magnet of the plurality of magnets is at least partially housed within the at least one internal cavity of the elongate member, the magnets being arranged such that the first loop is magnetically attracted to the second loop for forming a magnetic pressure anastomosis in tissue sandwiched between the f