An apparatus, system and method for determining the location of a treatment tool within a body using a waveguide coupled to the treatment tool and adapted to carry electromagnetic radiation to a point of egress near a predefined point on the treatment tool. The waveguide being connected to a radiation...http://www.google.de/patents/US20020038121?utm_source=gb-gplus-sharePatent US20020038121 - Apparatus system and for identifying a treatment tool within a patient's body
