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EP0137664A2
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EP
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Acetabular cup assembly prosthesis
Assignee: MTG Divestitures LLC
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Filing: 1984-08-20
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Granted: —
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Expires: 2004-08-20
Abstract
Abstract An acetabular cup assembly prosthesis (10) comprises the combination of a support shell (12) for introduction into an acetabulum (16) and a socket insert (14) in nesting engagement within the shell (12). The shell (12) has a generally hemispherical outer surface (24) and a downwardly extending concavity (20) surrounded by a peripheral rim (22). At least one anchoring post (26) secures the shell (12) to the acetabulum (16), and a central opening (30) in the bottom of the concavity (20) serves as a connection location for the socket insert (14). The insert (14) has a hemispherical concavity (32) that articulates with the rounded head of a femoral prosthesis, while the outer surface (34) of the insert (14) nests within the concavity (20) of the support shell (12). A central fastening tab (36) extends from the insert (14) into locking engagement with the opening (30) in the support shell (12), and structure (44, 46) is provided to prevent relative rotation of the shell (12) and insert (14).
Inventors
- 👤 Robert Vincent Kenna
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 17:55
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/34; A61F2/30767; A61F2002/30001; A61F2002/30316; A61F2002/30329; A61F2002/30476; A61F2002/305; A61F2002/3412; A61F2002/3414; A61F2220/00; A61F2220/0025
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
224 words
An acetabular cup assembly prosthesis (10) comprising the combination of a support shell (12) for introduction into an acetabulum (16) and a socket insert (14) for nesting engagement within the support shell (12), characterized by the support shell (12) having a generally hemispherical outer surface (24) and a downwardly extending concavity (20) surrounded by a peripheral rim portion (22), at least one anchoring post (26) on the outside of the support shell (12) adjacent the peripheral rim portion (22) and extending downward therefrom for securing the support shell (12) within the acetabulum (16), and a central opening (30) in the bottom of the concavity (20) for connecting the socket insert (14) to the support shell (12), the socket insert (14) having a hemispherical concavity (32) and an outer surface (34) that nests within the concavity (20) of the support shell (12), a central fastening tab (36) extending downward from the outer surface (34) of the socket insert (14) into locking engagement with the central opening (30) in the support shell (12), and means (44,46) on the support shell (12) and socket insert (14) preventing relative rotation of the socket insert (14) and support shell (12) about an axis that passes through the geometric center of the hemispherical concavity (32) of the socket insert (14) and the central opening (30) in the support shell (12).
Claim 2
Dependent Claim
224 words
An acetabular cup assembly prosthesis (10) comprising the combination of a support shell (12) for introduction into an acetabulum (16) and a socket insert (14) for nesting engagement within the support shell (12), characterized by the support shell (12) having a generally hemispherical outer surface (24) and a downwardly extending concavity (20) surrounded by a peripheral rim portion (22), at least one anchoring post (26) on the outside of the support shell (12) adjacent the peripheral rim portion (22) and extending downward therefrom for securing the support shell (12) within the acetabulum (16), and a central opening (30) in the bottom of the concavity (20) for connecting the socket insert (14) to the support shell (12), the socket insert (14) having a hemispherical concavity (32) and an outer surface (34) that nests within the concavity (20) of the support shell (12), a central fastening tab (36) extending downward from the outer surface (34) of the socket insert (14) into locking engagement with the central opening (30) in the support shell (12), and means (44,46) on the support shell (12) and socket insert (14) preventing relative rotation of the socket insert (14) and support shell (12) about an axis that passes through the geometric center of the hemispherical concavity (32) of the socket insert (14) and the central opening (30) in the support shell (12).
Claim 3
Dependent Claim
30 words
An acetabular cup assembly prosthesis (10) as in claim 1 wherein the concavity (20) in the support shell (12) is generally hemispherical and the peripheral rim portion (22) is annular.
Claim 4
Dependent Claim
84 words
An acetabular cup assembly prosthesis (10) as in claim 1 wherein the socket insert (14) includes an outwardly extending brim portion (42) engaging the peripheral rim portion (22) of the support shell (12), and the means (44,46) on the support shell (12) and socket insert (14) preventing relative rotation includes a slot (44) in the brim portion (42) of the socket insert (14) and a raised lug (46) on the peripheral rim portion (22) of the support shell (12) positioned within the slot (44).
Claim 5
Dependent Claim
39 words
An acetabular cup assembly prosthesis (10) as in claim 1 including a pair of spaced apart anchoring posts (26,28) on the outside of the support shell (12) wherein the anchoring posts (26,28) are spaced either 45° or 90° apart.
Claim 6
Dependent Claim
39 words
An acetabular cup assembly prosthesis (10) as in claim 1 including three spaced apart anchoring posts (26,28,29) on the outside of the support shell (12) wherein the three anchoring posts (26,28,29) collectively are spaced from 135° to 240° apart.
Claim 7
Dependent Claim
47 words
An acetabular cup assembly prosthesis (10) as in claim 1 wherein the central opening (30) in the support shell (12) includes an undercut (38) and the central fastening tab (36) on the socket insert (14) includes an outwardly extending portion (40) in engagement with the undercut (38).
Claim 8
Dependent Claim
75 words
An acetabular cup assembly prosthesis (10) as in claim 1 wherein the central fastening tab (58) of the socket insert (56) is bifurcated into two flexible branch portions (60,62) each having an outwardly extending locking lip (66), the central opening (30) in the support shell (12) includes an undercut (38), and the outwardly extending locking lip (66) of each branch portion (60,62) of the central fastening tab (58) is in engagement with the undercut (38).
Claim 9
Dependent Claim
26 words
An acetabular cup assembly prosthesis (10) as in claim 1 wherein the exterior surface (24) of the support shell (12) has a porous coating (48) thereon.
Claim 10
Dependent Claim
26 words
An acetabular cup assembly prosthesis (10) as in claim 1 wherein the support shell (12) is metal and the socket insert (14) is high density polyethylene.
Claim 11
Dependent Claim
68 words
A replacement socket insert (56) for an acetabular cup assembly prosthesis (10), characterized in comprising a body portion having a hemispherical concavity and a central fastening tab (58) extending downward from the outer surface of the body portion, the central fastening tab (58) including two flexible branch portions (60,62) separated by a slot (64) and each branch portion (60,62) having an outwardly extending locking lip (66) thereon. .
Claim 12
Dependent Claim
68 words
A replacement socket insert (56) for an acetabular cup assembly prosthesis (10), characterized in comprising a body portion having a hemispherical concavity and a central fastening tab (58) extending downward from the outer surface of the body portion, the central fastening tab (58) including two flexible branch portions (60,62) separated by a slot (64) and each branch portion (60,62) having an outwardly extending locking lip (66) thereon. .
References Cited (Backward Citations)
No citation records indexed.
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