Implantable humeral shoulder prosthesis having extended articular surface
AssigneeSulzer Orthopedics Inc.
InventorRobert G. Prybyla
Life of this patent
Estimating the term…
Abstract
An implantable humeral shoulder prosthesis includes a stem and a head. The stem includes a distal stem portion having a longitudinal axis and a proximal body, and a first connector having an axis disposed at an acute angle relative to the longitudinal axis. The head includes an undersurface and a spherical articulating surface having a center. The undersurface includes a second connector having an axis that does not pass through the center. The articulating surface subtends a greater angle in a first plane including the axis of the second connector than in a second plane including the axis of the second connector. The first and second connectors are mutually engageable to interlock the head to the proximal body.
Claims17
An implantable humeral shoulder prosthesis comprising:
- a stem including a distal stem portion having a longitudinal axis and a proximal body, said proximal body including a first connector having a first axis disposed at an acute angle relative to said longitudinal axis;
- and
- a head including an undersurface, a spherical articulating surface, including a skirt extending at least about 30 degrees below said undersurface to increase said articulation surface and a radial axis of symmetry that is perpendicular to said undersurface, said head further including at said undersurface a second connector having a second axis;
- said first and second connectors being mutually engageable to interlock said head to said proximal body, wherein said first and second axes are concentric with each other and are offset from said radial axis when said first and second connectors are mutually engaged to interlock.
Dependencies are inferred from the claim text.