Synthes Usa, LLC

Synthes Gmbh

Synthes Ag

Synthes Ltd. (u.s.a.)

Ao-forschungsinstitut Davos

Kaj Klaue

Jeffrey W Mast

Stephan M Perren

Jean L Chareire

Hans Brunner

The invention relates to a bone plate that has a longitudinal axis, top and bottom surfaces and plate holes which extend between the two surfaces for receiving bone screws or other fasteners. The bone plate is substantially symmetrical about a middle plane extending between the two surfaces. The symmetry of the bone plate makes it possible to set the bone plate on and fasten it to the bone with either surface facing the bone without affecting the clinical results.

Symmetrical bone plate

A lock washer for attaching a bone screw to a bone plate. The lock washer includes a body having a central axis and a borehole having internal threading for receiving the bone screw. The lock washer includes a lower section adapted to abut the surface of a bone, and an upper section shaped to be retained in a plate borehole. An osteosynthetic system including a bone plate having an upper surface, a lower surface to be positioned facing the bone, and a lock washer is also disclosed. In addition, an osteosynthetic bone plate having an upper surface, a lower surface, and boreholes extending through the bone plate from the upper surface to the lower surface is disclosed. Boreholes are provided with hollow protrusions extending beyond the lower surface of the bone plate and having an internal threading for receiving a bone screw.

Osteosynthetic bone plate and lock washer

A lockwasher is provided for attaching a bone screw to a bone plate, thus making up an osteosynthetic system. The washer has a threaded screw hole, a lower section with a surface to be applied to a bone and an upper section shaped to be retained in a plate borehole, the lower section being of less than average width than the upper section.

Lock washer for bone plate osteosynthesis

A stem for an endoprosthesis to be anchored in a bone (3) comprises a chamber (4) which surrounds the stem periprosthetically, which can be sealed in a pressure tight manner and which can be expanded with a thermoplastic or thermostable filling material (16). The rigid stem (1) of the endoprosthesis is connected mechanically to the bone (3) via the expandable chamber (4) by means of the filling material (16). The filling material is isolated from the bone (3), however, by the wall of the pressure-tight chamber (4). This makes it possible to ensure that the outer wall of the chamber (4) adjacent to the bone is extremely biocompatible.

Adaptable stem for endoprosthesis

An osteosynthetic pressure plate having several holes for bone screws positioned along its longitudinal axis and having an underside with curved recesses, designed for positioning on the bone so that immediately upon implantation there are spaces between the bone and the pressure plate.

Osteosynthetic pressure plate osteosynthetic compression plate

An osteosynthetic compression plate with holes for the insertion of bone screws, with a cross-section that is trapezoidal or otherwise provides for a decreased plate surface against the bone while providing necessary rigidity.

Osteosynthetic compression plate

An intramedullary nail has a tip portion provided with means for engaging a bolt previously inserted into a bone transverse to the bone axis.

Intramedullary nail

A drill guide for use with surgical compression plates having means to prevent the drill from contacting the sides of the plate holes when drilling obliquely.

Drill guide for use with surgical compression plates

A surgical compression plate is provided with at least one elongated screw hole with a sloping camming surface that bows outwardly to provide a constant torque until the screw is seated or a torque that increases gradually and then diminishes until the screw is seated, with a sudden increase in torque on seating, thereby to advise the surgeon that the screw has been seated.

Surgical compression plate

A surgical compression plate is provided which is designed to permit the insertion of bone screws at angles up to 45.degree.. A drill guide capable of tilting to various angles, for use in connection with the novel plate is also disclosed.

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Bern, Switzerland

Kaj Klaue