Optimal realization of arbitrary forces in a magnetic stereotaxis system

Author

Meeker, David C. ; Maslen, Eric H. ; Ritter, Rogers C. ; Creighton, Francis M.

Author_Institution

Dept. of Mech. & Aerosp. Eng., Virginia Univ., Charlottesville, VA, USA

Volume

32

Issue

2

fYear

1996

fDate

3/1/1996 12:00:00 AM

Firstpage

320

Lastpage

328

Abstract

Very small implanted permanent magnets guided by large electromagnetic coils have been proposed previously as a method for delivering hyperthermia 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 implanted magnet. The coil current-to-force relationship is developed for this type of machine, and several optimal solutions for realizing an arbitrary static force are presented for various constraints on the orientation of the implanted permanent magnet. Costs of the different solutions are compared in several examples using a mathematical model based on the Magnetic Stereotaxis System (MSS) developed by Stereotaxis, Inc., the University of Virginia, and Wang NMR

Keywords

biomedical equipment; brain; coils; hyperthermia; patient treatment; permanent magnets; arbitrary forces; brain tissue; catheters; coil current-to-force relationship; costs; design; force; hyperthermia; implanted magnet; implanted permanent magnet; large electromagnetic coils; magnetic stereotaxis system; mathematical model; optimal realization; orientation; stationary coils; very small implanted permanent magnets; Brain; Catheters; Coils; Costs; Electromagnetic forces; Humans; Hyperthermia; Mathematical model; Nuclear magnetic resonance; Permanent magnets;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.486515

Filename

486515