The present invention provides an implantable biomarker for finding a location inside a patient while performing minimally invasive or open surgical procedures. The implantable biomarker includes a dielectric base that includes two opposing sides from which extend a plurality of wave-guide rods. The...http://www.google.de/patents/US6654629?utm_source=gb-gplus-sharePatent US6654629 - Implantable biomarker and method of use
