A cannula assembly provides access to an interior body region. A grounding apparatus, a connector device, and methods associated with them are shown having improved efficiency and reliability among other advantages. If responsive messages are not timely received, they are generally resent. Signal information regarding motor speed and current is delivered from the switched reluctance motor with position sensing capability to the DSP controller and signal information regarding current and voltage is delivered from the battery to the DSP controller. Also provided are applications of such peptides for treating alkali-injuried eyes and other types of diseases.