| http://www.w3.org/ns/prov#value | - Rather than using a source for the magnetic field B that is located external to the patient 41, a special lead assembly 51, shown in cross-section in FIG. 15, may be used to produce a suitable magnetic field B. The lead assembly 51 includes an inner sleeve 53 and an outer sleeve 55, both of which are advantageously made of biocompatible material, such as silicone rubber.
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