Modular hip joint prosthesis
OwnerPhilipp Rolf Kropf, Albert Geisserinventors
Life of this patent
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Abstract
The modular hip prosthesis has an axial stem forming its distal part. Two modular proximal parts can be mounted on the stem from its proximal end and be rigidly connected thereto. Because the prosthesis has two modular parts at its proximal end, it can be optimally adapted to match the bone geometry intraoperatively. The diameter of the prosthesis in its proximal part and the position of the hip joint can be defined independently. Due to its slim shape and a drain for medullary material, the stem can directly be driven into the bone and does not require a pre-drilled cavity.
Claims15
A modular hip joint prosthesis comprising a stem forming a distal part of said prosthesis,
- a metaphysary part attachable to said stem from a proximal end of said stem and having a diameter increasing towards a proximal end of said metaphysary part, an outer surface of said metaphysary part providing a widening surface section of said prosthesis, and
- a cervical part attachable to said stem from said proximal end of said stem and carrying a laterally-projecting neck for receiving a ball or head of the hip joint, said cervical part alone defining the angle of projection of said laterally-projecting neck,
- wherein said proximal end of said stem extends into said cervical part and comprises a circular circumferential groove and flat lateral faces facing outwardly for rigidly connecting said stem to a tool for driving said stem into a bone,
- wherein said distal part is threadless and extends from said metaphysary part,
- and wherein said stem, said metaphysary part, and said cervical part are three separate modular parts.
A modular hip joint prosthesis comprising a stem forming a distal part of said prosthesis,
- a metaphysary part attachable to said stem from a proximal end of said stem and having a diameter increasing towards a proximal end of said metaphysary part, an outer surface of said metaphysary part providing a widening surface section of said prosthesis,
- a cervical part adjacent to said proximal end of said metaphysary part, attachable to said stem from said proximal end of said stem, and carrying a laterally-projecting neck for receiving a ball or head of the hip joint, said cervical part defining the angle of projection of said laterally-projecting neck, and
- a coupling means engaging said cervical part and said stem for pulling said cervical part against said stem, thereby pushing said metaphysary part against said stem,
- wherein said coupling means comprises
- a coupling member with arms engaging a circular circumferential groove of a proximal end of said stem and
- a threading for receiving a screw,
- wherein said coupling means is located in an opening of said cervical part and wherein walls of said opening prevent said arms from disengaging said groove.
A modular hip joint prosthesis comprising a stem forming a distal part of said prosthesis,
- a metaphysary part axially attachable to said stem from a proximal end of said stem and having a diameter increasing towards a proximal end of said metaphysary part, an outer surface of said metaphysary part providing a widening surface section of said prosthesis,
- a cervical part axially attachable to said stem from said proximal end of said stem and carrying a laterally-projecting neck for receiving a ball or head of the hip joint, said cervical part alone defining the angle of projection of said laterally-projecting neck, wherein said stem extends through said metaphysary part and into said cervical part,
- wherein said stem, said metaphysary part, and said cervical part are three separate modular parts.
A modular hip joint prosthesis comprising a stem forming a distal part of said prosthesis,
- a metaphysary part attachable to said stem from a proximal end of said stem and having a diameter increasing towards a proximal end of said metaphysary part, an outer surface of said metaphysary part providing a widening surface section of said prosthesis,
- a cervical part attachable to said stem from said proximal end of said stem and carrying a laterally-projecting neck for receiving a ball or head of the hip joint, said cervical part alone defining the angle of projection of said laterally-projecting neck, and
- a coupling means for pulling said stem toward said cervical part, said coupling means comprising
- arms for engaging a circular circumferential groove of a proximal end of said stem and
- a threading for receiving a screw,
- wherein said coupling means is located in an opening of said cervical part and wherein walls of said opening prevent said arms from disengaging said groove.
Dependencies are inferred from the claim text.