Sulzer Orthopedics Inc.

Thomas Willi

Andreas Marchione

Heinrich Stutz

The invention relates to a drilling jig for the determination of the axis of a femur head prosthesis. A guide tube ( ), around whose longitudinal axis ( ) a sensing probe can be rotated, has a rounded head ( ) which is supported in a housing ( ) pivotable in all directions and fixable by first clamping elements ( ), in order to fix its longitudinal axis in a desired angle. The housing ( ) is displaceable in all directions transversely to its longitudinal axis with respect to a base part ( ) which can be anchored to the femur head ( ) and fixable by two clamping elements ( ) in order to define the position of the longitudinal axis ( ) of the guide tube ( ) by rotation of a sensing probe around this longitudinal axis ( ) relative to the cross-section of the femur neck ( ).

Drilling jig for the determination of the axis of a femur head prosthesis

The invention relates to a ball draw-off apparatus for shaft prostheses with balls ( ) which can be placed onto the prosthesis neck ( ). The apparatus has two rotary bodies (5a, ) which are rotatably supported in a housing ( ), which can in each case be rotated with a lever arm ( ) and which with their axes of rotation ( ) lie in a common plane and form an open gap S in the projection onto the plane F for the introduction of the prosthesis neck ( ). The rotary bodies have a profile which with increasing rotation decreases the gap S for clamping the prosthesis neck ( ) and causes an increase of the distance of its upper edge ( ) from the plane F in order to produce a draw-off force P at the placed on ball directly or indirectly via an intermediate body.

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Breite Nürensdorf, Switzerland

Thomas Willi