The present invention is related to a preparation method of the compounds for absorbing heavy metals. The body-surface mapping system energizes groupings or regions of electrodes, then compares and adjusts the current driven through each grouping or region of electrodes to produce near-uniform fields. A method for construction of the self-assembling nanoparticle drug delivery system is also provided. An elongated support assembly includes a central axis, and an ablation surface extending longitudinally along an exterior surface portion of the support assembly. A contrasting vivid color band on distal cutting sections optically merges into a distinctively visible cutting edge for obstacle avoidance and safety enhancement. The invention may be used at a third party site remote from the system transmitters and receivers.