SELECTIVE MAGNETIC POSITIONING TOOL

摘要

An actuation device comprises a housing, and a plurality of permanent magnets disposed about the housing. The plurality of permanent magnets is configured to selectively transition between a first position and a second position. The plurality of permanent magnets is configured to provide a stronger magnetic field strength outside the housing than inside the housing in the first position, and wherein the plurality of permanent magnets is configured to provide a stronger magnetic field strength inside the housing than outside the housing in the second.