Patent ID: 8890511

Claim:
A system for targeting an operation site, comprising: an identifier having an electromagnetic field generator configured to produce electromagnetic fields; a surgical implement comprising: a handle; a blade portion coupled to the handle, the blade portion comprising a curved portion; and an electromagnetic field sensor removably coupled to the blade portion, the surgical implement defining a channel that extends through a portion of the blade portion and is configured to receive the electromagnetic field sensor, the blade portion including a transparent or translucent portion near the channel, wherein the electromagnetic field sensor is coupleable at any of a plurality of predefined positions within the channel, and wherein the surgical implement comprises a plurality of landmarks, each of the plurality of landmarks corresponding to one of the plurality of predefined positions within the channel, the landmarks being visible at an exterior surface of the surgical implement; and a control unit configured to access information indicating a position of the electromagnetic field sensor relative to the operation site, receive a signal from the electromagnetic field sensor that is indicative of a position of a tool relative to the electromagnetic field sensor, and determine a position of the tool relative to an operation site based on the received signal and the position of the electromagnetic field sensor relative to the operation site.