Aesculap, Inc.

Other

Xnov IP

Jean-Francois Biegun

Aesculap Ag

Xnov IP Sarl

Pascal Marceaux

Jean-Fran&ccedil;ois Biegun

Dominique Saragaglia

Jean-François Biegun

Rolf K Miehlke

Jean-Yves Jenny

Frédérique Biegun

Pascal Loehle

Jacques Hummer

Bernard Reigner

Laurent Barba

Damien Arnalsteen

Yves Catonne

Jean-Paul Barthelemy

Antoine Gabrion

Patrice Merti

Emmanuel Marchetti

Joseph Bronner

François Chalencon

Jean Marie Fayard

Hilmi Radwan

Arnaud Mulliez

Pascal Moreau

Christophe Fornasieri

Rolf Miehlke

Yannick Pinoit

A tibial component of a knee prosthesis includes a tibial plate and a tibial insert, and anterior and posterior abutments projecting from an upper face of the tibial plate. The anterior abutment extends along at least part of the tibial plate and the posterior abutment extends for at least part of the tibial plate and comprises a part forming a promontory and an anterior cut-out, in particular central, in the form of a window formed in the anterior abutment opening onto the posterior face of the latter opposite the part forming the promontory. The tibial insert has a face upper, a face lower and a lateral face, which has a shape matching the part forming the promontory, characterised in that at least one flexible tab in the form of a hook projects centrally from an anterior face of the insert and locks by snap-fitting, into the anterior cut-out.

Tibial component and tibial insert of a knee prosthesis comprising a promontory and its associated cut-out

The invention concerns an accessory for removing material, in particular a file () or a cutting block, for prosthesis implantation surgery, in particular for hip or knee prostheses. The invention is characterised in that it comprises at least partly one plastic part and at least one insert () made of a material harder than the bone material, in particular of metal, which is fixed to the plastic material such that if the device is brought to a temperature Ti, the insert is separated from the plastic material.

Accessories for removing bone material and method for making same

An accessory for removing material for prostheses surgery including a plastic part and an insert made of a material harder than the bone material, the insert being embedded in the plastic part such that if the device is brought to a selected temperature, the accessory deteriorates itself.

The femoral component of a knee prosthetic includes a trochlean part ( ) and at least one, but preferably two condyles ( ) wherein a trochlean trajectory is defined within the external surface of the component by the trochlea. A set of internal flat sides ( and ) are implemented to make contact with corresponding re-cut sides of the extremity of the femur and define an internal open cage within the internal surface of said component and further define edges ( and ) between themselves. The perpendicular projection ( ) of said trochlean trajectory in the medial lateral perspective of said femoral component has a tilt angle (alpha) with a value different from zero relative to the line ( ) perpendicular to the perpendicular projection of said edges in said medial lateral perspective.

Tilted femoral component

A femoral part of a knee prosthetic of the type known as comprising three compartments, including two condyles ( ) and a trochlea surface part ( ) wherein the femoral part is to be anchored to the distal extremity of a femur and the external surface of the condyles is to co-operate with the upper external surface of a tibia insert such that, in a longitudinal section, the trochlea support surface ( ) defines a trochlean trajectory following a first circular arc and, still in a longitudinal section, the external surface of the condyles ( ) includes at least partially an intermediary circular arc ( ), characterised in that in a longitudinal section, the external surface of the condyles ( ) comprises an intermediary surface ( ) and an extremity surface ( ) both of which are a circular arc, with the intermediary circular arc ( ) extending over an angle of 80&deg; to 90&deg;, the extremity circular arc ( ) extending over an angle of 40&deg; to 50&deg;, the value of the curvature radius of the extremity arc ( ) being strictly less than the value of the curvature radius of the intermediary arc ( ).

Femoral component of a knee prosthetic including three curvature radii

A complete prosthetic of the knee includes a femoral part ( ) and a meniscus ( ), with said femoral part ( ) comprising at least one condyle ( ) and a trochlea part, wherein said one or a plurality of condyles each have an external surface, the shape of which complements the respective upper surface of said meniscus ( ) in order to obtain a congruence of said surfaces on at least part of the normal flexing range. At least one cavity is implemented in said trochlea such that the femoral part is blocked in its flexion by rotation in the case of negative angles beyond an inferior negative angle limit when the anterior upper edge of the meniscus comes to rest against said cavity.

Knee prosthetic with cavity implemented in the trochlea

A knee-joint prosthesis including a tibial insert ( ) between a tibial plate ( ) provided on its outer surface with means for fixing to a tibia, and a femoral part comprising a condyle provided with means for fixing to the femur, the tibia insert ( ) being mounted on the tibial plate ( ) and comprising at least two upper surfaces ( ) complementary in shape with the outer surface of the condyles, a tenon ( ) is fixed to the inner surface of the tibial plate ( ) and projects upwards and comprises an oblong part ( ) extending parallel to the inner surface of the tibial plate ( ), and the tibial insert ( ) has a cavity ( ) in which the oblong part ( ) engages with possibility of rotation and translation of the tenon ( ) relative to the tibial insert ( ).

Total knee joint comprising an insert movable relative to a tenon

A knee endoprosthesis comprising: a tibial part comprising a tibial rod bearing a tibial plate, a first tibial insert (,) disposed on the tibial plate, a femoral part comprising a femoral rod bearing two condyles (,) each having a first sliding surface co-operating and congruent with a respective second sliding surface formed on the first tibial insert (,), wherein the tibial part is coupled to the femoral part so that the femur can bend relative to the tibia from a position (&agr;&ap;0) where the knee is extended to a position (&agr;,) where the knee is bent and vice versa. A progressive locking element is provided for limiting the lateral rotation and proper rotation of the condyles (,) relative to the tibial plate, starting from a knee-bending angle &agr;,determined in advance and up to a zero angle, the amplitude of proper rotation, when the angle &agr;,is decreased, varying down to zero amplitude (complete blocking) at zero angle (unbent knee).

Tibial knee prosthesis comprising a ball joint with double inserts

Knee prosthetic, incorporating a prosthetic femoral component designed to be fixed to the furthest or nearest extremity, of the femur, a tibial prosthetic component designed to be fixed to the nearest or upper extremity of the tibia and at least one intermediary mobile meniscoid prosthetic involving a lower surface working together by sliding with the complementary upper surface of the tibial component, and at least one upper concave surface working together by sliding with a lower condyloid convex surface of the femoral component, characterised by the fact that the upper surface of the tibial component and the lower surface of the meniscoid component are flat and sloped in the same angle from the top at the rear towards the front.

Knee prosthetics

Growing community of inventors

Chaumont, France

Pascal Marceaux