| 20110196503 | Modular Joint Prosthesis - The invention relates to modular joint prostheses, comprising a curved head part and/or a shaft-like shaped shaft part, to the conical pins of which a slip-on joint ball is attached, and comprising a nail which can be inserted into the bone marrow canal of the long bone and has a nail neck, wherein a connecting means is provided between the head part and the nail neck which holds the head part in a non-rotatable manner. The invention is based on the problem of providing a modular joint prosthesis which increases the modularity of the prosthesis by increased longitudinal variability, enables improved adjustability of the angular position while reducing the number of parts at the same time, and simplifies revision surgeries. This problem is solved for the prosthesis having the curved head part in that the connecting means comprises at least one collar-like module which is located in the axial direction of the nail and has at least two semi-shells, which are divided in the axial direction of the module, are detachably connected to each other, form an axially extending passage with each other for inserting the nail head into the passage and have recesses, which are disposed coaxially in the longitudinal direction of the module, are positioned perpendicularly to the axis and correspond to each other, for receiving a tensioning means, which in the tensioned state fixes the nail head in the passage exclusively by way of frictional engagement in a jaw-like manner with a tightening torque sufficient to prevent axial displacement and rotation. | 08-11-2011 |
| 20110208315 | Knee Arthrodesis Implant - A knee arthrodesis implant has a femur nail inserted in the bone marrow canal of the femur, and a tibia nail inserted in the bone marrow canal of the tibia, the nails being rigidly connected to each other by a connecting means. The problem of providing a knee arthrodesis implant having increased modularity as the result of increased length variability, having a reduced number of parts, and allowing simplified modification is addressed. The problem is addressed in that the connecting means has at least one collar-like module lying in the axis direction defined by the nail, the module having at least two half-shells which are connected to each other in a detachable manner and which are separated in the axis direction (LA) of the module, said half-shells together forming a passage which extends axially and through which a nail neck is inserted, and which have recesses corresponding to each other for receiving a tensioning means, said recesses being arranged coaxially in the longitudinal direction of the module and positioned perpendicular to the axis (LA). The tensioning means fixes the respective nail neck in the passage when in the tensioned state in the manner of a clamping jaw, exclusively by means of a friction fit producing a sufficient clamping torque to prevent axial displacement and rotation. | 08-25-2011 |
