Institut Straumann Ag

Synthes Usa, LLC

Other

Synthes Gmbh

Institut Dr. Ing. Reinhard Straumann, A.g.

Fritz Straumann

Franz Sutter

Slobodan Tepic

Stephen M Perren

Joram Raveh

Stephan N Perren

A bone plate for use in osteosynthesis having a plurality of contact elements extending from its lower surface so that contact between plate and bone is reduced to the minimum contact needed during attachment of the plate to a bone.

Point contact bone compression plate

A plate is provided with clearance holes and fastening screws. Each screw is provided in the region of its head with a clamping part subdivided into tongues by means of slots and provided with an internal opening bounded by a conical surface. To each screw belongs an expander having a conical outer surface. The expander is axially displaceable in relation to the clamping part to force the tongues of the clamping part apart and lock the screw in relation to the plate. A rigid connection between the plate and the screws is thus provided, even if reabsorption of bone material takes place at the bearing surface of the plate.

Device comprising an implant and screws for fastening said implant to a

A plate bearing against a bone has a number of clearance holes with sleeves. Openings provided in the sleeves include each a section diverging away from the bone and bounded by a conical surface. The sleeves are subdivided into tongues by means of slots cut into the free face of the collar. A screw is screwed into the bone at every clearance hole, the head of the screw being bounded by a conical or convex surface. By tightening the screw the tongues are forced apart by the head of the screw, thus clamping the sleeve in relation to the plate. This provides a guarantee, that the plate will stay rigidly connected with the screws, even if a reabsorption of bone takes place. Some of the sleeves comprise clamping parts excentric in relation to the screw axes, enabling the surgeon to press the bone pieces against each other.

Device comprising a plate and screws for fastening a plate to a bone

Oil burner for low heating capacities

A prosthesis for forming the spherical part of a hip joint with a calotte-shaped cap is disclosed. The inner surface of the prosthesis is provided with grooves and ribs which are evenly distributed over the circumference of the inner surface and extend along planes which, in turn, extend through the rotational symmetry axis of the outer cap surface. A sleeve having jacket is provided with holes is rigidly secured at the inner end of the inner cap surface on the cap and projects partly out of the latter. The ribbing of the inner cap surface and the sleeve permit the prosthesis to be firmly and durably secured in an operation on the bone without cement.

Universal joint prosthesis with cap

An implant for fixing an artificial replacement tooth to a jaw bone comprises a post for firmly holding the replacement tooth and at least two hollow cylindrical bodies. The bodies have mutually parallel axes, are rigidly connected to the post and open at one axial end. The cylindrical wall of each body is intended to be inserted into the jaw bone and is provided with means defining passages through which the jaw bone can grow to secure the implant to the jaw. A group of teeth may be fixed to the jaw by the use of a bridge and two or more implants.

Implant for an artificial tooth

A bearing part comprises an age hardened cobalt alloy having a bearing surface exposed to bearing friction provided with a boride covering layer. The bearing part is manufactured by forming a ductile age hardening alloy of cobalt and ageing it by heat treatment and meanwhile depositing a layer of boride onto the bearing portion of the alloy at a temperature of from between 550.degree. to 900.degree. C by diffusion from a vapor phase or a solid phase.

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Waldenburg, Switzerland

Fritz Straumann