OPTIMAL REALIZATION OF ARBITRARY FORCES IN A MAGNETIC STEREOTAXIS SYSTEM

Very small implanted permanent magnets guided by large electromagnetic coils have been proposed previously as a method for delivering hypert hermia to or guiding catheters through brain tissue, This procedure is termed ''magnetic stereotaxis,'' Early efforts employed a single coil on a movable boom, a design that proved logistically difficult to use on human patients, The present work deals instead with a design where several stationary coils are employed to develop a force on the impla nted magnet; The coil current-to-force relationship is developed far t his type of machine, and several optimal solutions for realizing an ar bitrary static force are presented for various constraints on the orie ntation of the implanted permanent magnet, Costs of the different solu tions are compared in several examples using a mathematical model base d on the Magnetic Stereotaxis System (MSS) developed by Stereotaxis, I nc., the University of Virginia, and Wang NMR.