Drill-device for alignment of a bone screw driven into the neck of a femur

A drill-guide device for a drill to produce a bone-screw pilot hole extending substantially transverse to a longitudinally extending intramedullary nail which has been longitudinally installed in a femur having a fracture in the femoral neck thereof, wherein the intramedullary nail has an exposed proximal end, said device comprising a drill template (5) and adjustable means for removably attaching said template to the proximal end (2) of the intramedullary nail (1) and for adjustably tilting said template about a horizontal axis (A--A) extending transverse to the longitudinal axis of the intramedullary nail (1) and transverse to the direction of the femoral neck, said adjustable means including means for vertically adjusting said template in a direction parallel to the longitudinal axis of the intramedullary nail (1), said drill template (5) being a block having at least two drill-guide bores (3, 4) which are at a horizontal spacing (a) transverse to the longitudinal axis of the intramedullary nail (1) and transverse to the direction of the femoral neck, said spacing being sufficient for said bores to straddle the intramedullary nail (1), said drill-guide bores (3,4) being on axes (X, Y) which define a geometric plane that is inclined in substantial conformance with the slope of the femoral neck with respect to the shaft of the femur, the axes (X, Y) of the respective drill-guide bores (3, 4) converging in the direction of the alignment of the femoral neck in such manner that these axes geometrically intersect beyond the femoral head.

A drill-guide device for a drill to produce one or more bone-screw pilot holes for bone-screw stabilization of a femoral-neck fracture, particularly in the circumstance of an intramedullary nail already installed in the shaft of the same femur, the intramedullary nail having a longitudinal axis and an exposed proximal end, said device comprising a drill template and a suspension system with means for removably and rotatably connecting said template to the proximal end of the intramedullary nail, said suspension system comprising a straight member extending radially with respect to said axis and rotatable about said axis at the connection to the intramedullary nail and therefore providing a means of visually positioning said straight member for viewed registration with the radial direction of the femoral neck, a vertically downward member connected to said straight member and including means providing vertically adjustable and releasable clamped connection to said template, said template having at least one pair of horizontally spaced drill-guide bores which are spaced sufficiently to straddle opposite sides of the intramedullary nail and which can be oriented for the guided drilling of holes which traverse but do not interfere with opposite sides of the femoral shaft and which extend up the femoral neck and into the head of the femur, the axes of the respective guide bores converging to their geometric intersection at a point which is beyond the femoral head.