Acetabular cup positioning insert
First Claim
1. An acetabular cup comprising:
- an insert having a body including a central bore for receiving a positioning rod;
a key element formed on said bore adapted to engage a keyway on said positioning rod to align said positioning rod, said insert having a locating element formed on an outer surface of said body and a spring element extending radially outwardly from said body;
a generally hemispherical shell member coupled to said insert and having an outer surface for engaging the acetabulum and an inner surface including means for engaging said spring element for releasably coupling said insert on said shell, said shell having a plurality of apertures extending from said inner to said outer surface of said shell member, said shell member having a means for aligning said insert locating element at a predetermined orientation with respect to said apertures so that the coupling of said insert onto said shell and the engagement of said locating element with said means for alignment aligns said key element on said central bore thereof at a predetermined orientation with respect to said apertures in said shell.
6 Assignments
0 Petitions
Accused Products
Abstract
An acetabular cup for use as a prosthetic implant has an insert with a body including a central bore for receiving a positioning rod therein. A key element is formed on the bore and is adapted to align the positioning rod. The insert has a locating element formed on an outer surface of the body and also includes spring elements extending radially outwardly from the body. The acetabular cup has a generally hemispherical shell member coupled to the outer surface of the insert. The shell has an outer surface for engaging the acetabulum and an inner surface having a circumferential groove for receiving the spring elements. The spring elements may be deflected radially inwardly out of engagement with the groove for releasing the insert from the shell. The shell has a plurality of apertures extending from its inner to its outer surface, which apertures are located in an asymmetrical pattern about the shell. The shell includes a recess on its open end for receiving the locating element on the insert to align the insert at a predetermined orientation with respect to the apertures in the shell. The engagement of the insert onto the shell and the engagement of the locating element in the recess aligns the key element on the central bore and, therefore, the positioning rod at a predetermined orientation with respect to the apertures in the shell.
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Citations
20 Claims
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1. An acetabular cup comprising:
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an insert having a body including a central bore for receiving a positioning rod; a key element formed on said bore adapted to engage a keyway on said positioning rod to align said positioning rod, said insert having a locating element formed on an outer surface of said body and a spring element extending radially outwardly from said body; a generally hemispherical shell member coupled to said insert and having an outer surface for engaging the acetabulum and an inner surface including means for engaging said spring element for releasably coupling said insert on said shell, said shell having a plurality of apertures extending from said inner to said outer surface of said shell member, said shell member having a means for aligning said insert locating element at a predetermined orientation with respect to said apertures so that the coupling of said insert onto said shell and the engagement of said locating element with said means for alignment aligns said key element on said central bore thereof at a predetermined orientation with respect to said apertures in said shell. - View Dependent Claims (2, 3, 4)
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5. An insert for a prosthetic acetabular cup shell of the type having a generally hemispherical shape with an open end and a recess on an inner surface thereof adjacent the open end, said insert comprising:
a body having a central longitudinal bore therethrough aligned with the central axis of said hemispherical shell, said bore having a key element formed thereon, said body having a first end adapted to be received within said acetabular cup shell and a second end extending outwardly of the open end thereof, a spring element connected to said body at the first end thereof and having a free end spaced radially outwardly of said second end of said body, said free end of said spring element having a means for engaging the recess on the inner surface of the acetabular cup shell for retaining said insert within said cup. - View Dependent Claims (6, 7, 8, 9)
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10. An acetabular cup of the type having an outer shell including a plurality of apertures therethrough comprising:
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an insert having a body including a central bore for receiving a positioning rod; an alignment element formed on said central bore for aligning said positioning rod with respect to said insert, said insert having a locating element formed on an outer surface of said body and a means for releasably engaging the outer shell; said outer shell having an outer surface for engaging the acetabulum and an inner surface including means for capturing said means on said insert for releasably engaging the outer shell, said outer shell including means for aligning said insert locating element at a predetermined orientation with respect to the apertures in the outer shell so that upon engagement of said insert with said outer shell and the engagement of said locating element with said means for aligning, said alignment element on said central bore is aligned at a predetermined orientation with respect to said apertures. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An acetabular cup comprising:
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an insert having a body including a central bore for receiving a positioning rod; a key element formed on said bore adapted to engage a keyway on said positioning rod to align said positioning rod, said insert having a locating element formed on an outer surface of said body and a spring element extending radially outwardly from said body; a generally hemispherical shell member coupled to said insert and having an outer surface for engaging the acetabulum and an inner surface including means for engaging said spring element for releasably coupling said insert on said shell, said shell having a plurality of spikes extending outwardly of said outer surface of said shell member, said shell member having a means for aligning said insert locating element at a predetermined orientation with respect to said spikes so that the coupling of said insert onto said shell and the engagement of said locating element with said means for alignment aligns said key element on said central bore thereof at a predetermined orientation with respect to said spikes in said shell. - View Dependent Claims (18, 19, 20)
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Specification