System and method for navigated drill guide

摘要

A system for tracking a navigated instrument. The system can include a first elongated instrument and a second elongated instrument. The first elongated instrument can have a first proximal end and a first distal end. The first elongated instrument can be adapted to be positioned relative to an anatomy. The second elongated instrument can move adjacent to the first elongated instrument. The second elongated instrument can have a second proximal end and a second distal end. The system can also include at least one tracking device coupled to the second elongated instrument. When the second elongated instrument is in a first position, the at least one tracking device tracks the first distal end of the first elongated instrument, and when the second elongated instrument is in a second position, the at least one tracking device tracks the second distal end of the second elongated instrument.

主权项

1. A system comprising:
a guide instrument that has a first proximal end, a first distal end and defines a first bore, the guide instrument positionable with a handle adjacent to an anatomy; a sleeve having a second proximal end, a second distal end and a second bore, the sleeve slideably received within the first bore; a drill bit slideably received within the second bore and moveable relative to the sleeve, having a third distal end and an axially extending body composed of a first non-ferrous metal material, the body including at least two distinct segments that are axially separated, wherein the at least two distinct segments composed of a second non-ferrous metal material, the first non-ferrous metal material having a first magnetic permeability different from a second magnetic permeability of the second non-ferrous metal material and the at least two distinct segments include a segment length less than a total length of the body; at least one tracking device fixedly coupled about the sleeve; and a controller configured to receive a varying signal from the at least one tracking device based at least on the first magnetic permeability different from the second magnetic permeability; wherein when the sleeve is in a first position, the at least one tracking device indicates a position of the first distal end of the guide instrument, and when the sleeve is in a second position, the at least one tracking device indicates a position of the third distal end of the drill bit; wherein movement of the drill bit relative to and within the second bore of the sleeve and relative to the at least one tracking device acts to change a current induced in the at least one tracking device due to movement of a first distinct segment and a second distinct segment of the at least two distinct segments through the at least one tracking device and to determine a depth of the third distal end; wherein the controller receives the varying signal based on the current induced in the at least one tracking device to at least assist in determining at least one of a position or a trajectory of the drill bit.