| http://www.w3.org/ns/prov#value | - These methods have been confined to straightline approaches to a target. [0005] There is also a smaller body of prior art in which a handheld permanent magnet or an electromagnet is used to move a metallic implant. [0006] Previous implants for delivering medication or therapy to body tissues, and particularly brain tissue, have generally relied upon the navigation of tethered implants within vesse
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