Locking nail for treating fractures of the proximal femur
AssigneeStryker Trauma GmbH
InventorsAndreas Werner Speitling, Klaus Dorawa, Geert Von Oldenburg
Life of this patent
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Abstract
An interlocking nail, particularly for fractures of the proximal femur having a proximal portion that has provided therein a bore preferably extending obliquely to the axis of the proximal portion for receiving a screw or pin, particularly a femoral neck pin. The bore is formed so that the lateral edge portions located on opposed sides are flattened and rounded at the inlet end or also the outlet end of the bore and continuously pass over into adjacent edge portions towards the proximal and distal sides of the inlet end and/or outlet end.
Claims17
An interlocking nail, particularly for fractures of the proximal femur comprising a proximal portion having a longitudinal axis having a bore extending transverse to the axis of the proximal portion for receiving a screw or pin, the bore having lateral edge portions located on opposed sides of the bore which are flattened and rounded at a screw or pin inlet end which edge portions continuously pass over into adjacent edge portions towards the sides of the bore aligned with said axis at the bore inlet end.
A method for manufacturing an interlocking nail, particularly for fractures of the proximal femur having a proximal portion with a longitudinal axis, said proximal portion having a bore extending obliquely to the axis of the proximal nail portion for receiving a screw or pin, particularly a femoral neck pin, the method comprising:
- forming an edge of an inlet end of the bore with a circumferential chamfer the shape and run of which are defined by using a circular milling cutter which rotates about an axis perpendicular to the axis of the proximal portion and which has an outer diameter which is larger than a diameter of the bore and moving the cutter approximately centrally against the inlet end and against the edge of the inlet end approximately perpendicularly to a longitudinal axis of the proximal nail portion until the circumferential chamfer has been produced.
A nail for insertion into the medullary canal of a long bone comprising:
- an elongated shank extending along a longitudinal axis from a first end to a second end of said shank;
- a bore extending through the shank along an axis transverse to said longitudinal axis for receiving a bone fastener, said bore having an inlet end into which the bone fastener is inserted, an outer nail surface surrounding said bore inlet end having recessed edges along first and second sides thereof said recessed edges being substantially planar and extending in a plane generally parallel to the longitudinal axis of said shank.
Dependencies are inferred from the claim text.