Acetabular cup fixation
AssigneeBiomet Manufacturing, LLC
InventorJason D. Meridew
Life of this patent
Estimating the term…
Abstract
An acetabular cup system includes an acetabular cup having a wall with an inner surface and an outer surface. The acetabular cup includes a fixation opening through the wall, the fixation opening including a first wall portion adjacent to the inner surface and a second wall portion adjacent to the outer surface. The acetabular cup system also includes a fixation fastener including a head and a shaft with a bone-anchoring portion. The fastener can be inserted though the fixation opening. The head includes a first head portion engageable with the first wall portion and a second head portion engageable with the second wall portion.
Claims16
An acetabular cup system comprising:
- an acetabular cup having a wall with an inner surface and an outer surface, the acetabular cup including a fixation opening through the wall, the fixation opening including a first wall portion adjacent to the inner surface and a second wall portion adjacent to the outer surface;
- and
- a fixation fastener including a head and a shaft with a bone-anchoring portion, the fixation fastener insertable though the fixation opening, the head including a first head portion engageable with the first wall portion and a second head portion engageable with the second wall portion, wherein the first head portion is substantially spherical and has an unthreaded surface that extends towards a central axis of the fixation fastener past a thread of the second head portion and the second head portion is cylindrical and the thread is a self-tapping thread configured to cut into the second wall portion.
An acetabular cup system comprising:
- an acetabular cup having a wall with an inner surface and an outer surface, the acetabular cup including a fixation opening through the wall, the fixation opening having an unthreaded surface with a spherical portion extending from the inner surface and a cylindrical portion having a single constant diameter extending an entire distance from the spherical portion to the outer surface;
- and
- a fastener including a head with a first threaded portion and a shaft with a bone anchoring portion and a second threaded portion, wherein the fastener is insertable through the fixation opening,
- wherein the first threaded portion includes cutting threads to threadably engage an entire circumference of a cylindrical portion of the fixation opening, and wherein the second threaded portion includes threads different from the cutting threads to threadably engage a bone portion.
An acetabular cup system comprising:
- an acetabular cup having a wall with an inner surface and an outer surface, the acetabular cup including a fixation opening through the wall, the fixation opening having an unthreaded surface with a spherical portion extending directly from the inner surface and a cylindrical portion having a single constant diameter extending directly from the spherical portion an entire distance to the outer surface;
- and
- a fastener including a head and a shaft with a bone anchoring portion, the fastener insertable though the fixation opening, the head including an unthreaded spherical portion mateable with the spherical portion of the fixation opening and a threaded portion extending directly from the spherical portion of the head and having self-tapping threads that cut threads into the cylindrical portion of the fixation opening and engages an entire circumference of the cylindrical portion of the fixation opening when the fixation fastener is fully seated in the fixation opening.
Dependencies are inferred from the claim text.