Patent ID: 7686818

Claim:
A stereotaxic apparatus for a locking nail comprising two oscillating circuits which are disposed in a recess in an outer surface of the nail along the longitudinal direction of the locking nail and spaced from a cross-bore in the nail, the apparatus having a guide sleeve to place a drill or bone screw which, when the stereotaxic apparatus is in an oriented condition, points to a cross-bore in the locking nail wherein the stereotactic apparatus has: three or more oscillating circuits are arranged in a first plane that are equidistant each from a first center located in said plane; three or more oscillating circuits are arranged in a second plane extending in parallel with said first plane that are equidistant each from a second center located in said second plane; wherein said first and second planes are arranged towards each other such that a face normal to one of the planes extends through said first and second centers; and at least two oscillating circuits are arranged at a distance from a straight line extending through said centers and the interconnecting straight line of which, in the condition aligned with said locking nail, is substantially perpendicular to the longitudinal direction of said locking nail wherein an additional excitation coil is provided which emits a HF pulse for an excitation of the oscillating circuits in the locking nail.