Patent ID: 7941213
Filing Date: 2011-05-10
Classification: A61N

Abstract:
1. A system to determine a location of an electrode within a volume, comprising: a medical device sized and shaped to be positioned by implantation and contained within the volume, the medical device including: a lead having a first implantable electrode; an implantable case containing an electronics system operable to receive a signal from the first implantable electrode, wherein the first implantable electrode is operable to move based on contact with a surface within the volume and relative to the implantable medical device; a connector extending from the lead to be connected to the electronics system; and a current injecting system operable to inject a current into the volume between a first injecting electrode and a second injecting electrode; wherein the first implantable electrode is operable to sense a voltage at a location due at least in part to the current injected into the volume.