Mathys Medizinaltechnik Ag

Synthes Usa, LLC

Peter Christen

Daniel Delfosse

Anton Cotting

Renzo Renzini

Christof Muller

Enzo Barbieri

The invention relates to a positioning instrument () for inserting an extension shell () into a human or animal bone, especially a pelvic bone. Said instrument comprises a fixing device () for fixing the extension shell () to the positioning instrument (), and a displacement device () for displacing a disc element () of the positioning instrument () at least essentially axially in relation to the extension shell () fixed to the fixing device (). Said disc element () co-operates with beveled surfaces (to) of the extension shell () during the displacement, in order to tighten the extension shell (). Furthermore, the disc element ()-viewed in the direction of insertion ()-does not project beyond the radially furthest projecting elements () of the tightened extension shell ().

Positioning instrument for inserting an extension shell

The invention relates to an expandable socket () for a hip joint endoprosthesis able to be cementlessly anchored in place which is at least approximately hemispherical and which is provided with a plurality of slots () extending in a meridional direction, thus forming intervening tongues (), on which are formed projections () that form a plurality of rows () extending from an equator () of the expandable socket (). The projections () are arranged on the tongues () in such a manner that a row () of projections () arranged in the center of the tongue () extends on a meridian () of the hemispherical socket () while at least one adjoining row () of projections () extends in a line that extends at all points in parallel to the meridian () of the row () of projections () arranged in the center and not through a pole () of the hemispherical expandable socket ().

Expandable socket

A drill head for intramedullary drilling has a front part, a middle part and a rear part and is shaped as a hollow body of revolution. The front and rear parts have spiral slots formed with cutting edges. The rear part has an attachment for coupling to a drilling shaft.

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Selzach, Switzerland

Peter Christen