Prosthetic acetabular devices

Claim 2

A prosthetic acetabular device, comprising: a cup having hemispherical inner and outer surfaces and a circular rim joining said surfaces; a plurality of annular ribs each extending from and circumscribing said outer surface parallel to said rim, and including one such rib bordering said rim; a disc form end stop extending from that part of said outer surface most remote from said rim, said stop having an annular edge disposed parallel to said rim; each of said ribs and said stop being formed integrally with said cup and extending therefrom substantially uniformly; said ribs and said stop being uniformly mutually spaced to define grooves therebetween having significantly greater transverse dimensions than said ribs; and each of said ribs except said one rib being formed with a plurality of transverse passages therethrough and uniformly spaced therearound to communicate neighboring ones of said grooves.

Claim 3

A prosthetic device for use as a bone joint socket replacement, which device is designed to be used together with a self-hardening or self-curing gap-filling agent within a cavity cut in the bone at the joint socket, said prosthetic device comprising: a cup-shaped member having a substantially hemispherical inner surface, a substantially hemispherical outer surface, and a circular rim joining said surfaces; and a plurality of annular ribs extending from and circumscribing said outer surface parallel to said rim and including one such rib bordering said rim; said ribs extending from said outer surface substantially uniformly to ensure a sufficient spacing of said outer surface from said cavity to accommodate a desired thickness of said gap-filling agent therebetween; said ribs being mutually spaced to define grooves therebetween having significantly greater transverse dimensions than said ribs to ensure that a major proportion of said outer surface area is bonded to said cavity by said gap-filling agent; said ribs being integrally formed with said member and having side faces extending radially relative to the hemispherical center of said outer surface to afford dovetail transverse sectional shaping for said ribs to ensure enhanced bonding with said gap-filling agent; and each of said ribs except said one rib being formed with a plurality of transverse passages therethrough and uniformly spaced therearound to communicate neighboring ones of said grooves and ensure uniform distribution of said gap-filling agent.

Claim 4

A prosthetic device for use as a bone joint socket replacement, which device is designed to be used together with a self-hardening or self-curing gap-filling agent within a cavity cut in the bone at the joint socket, said prosthetic device comprising: a cup-shaped member having a substantially hemispherical inner surface, a substantially hemispherical outer surface, and a circular rim joining said surfaces; and a plurality of annular ribs extending from and circumscribing said outer surface parallel to said rim and including one such rib bordering said rim; said ribs extending from said outer surface substantially uniformly to ensure a sufficient spacing of said outer surface from said cavity to accommodate a desired thickness of said gap-filling agent therebetween; said ribs being mutually spaced to define grooves therebetween having significantly greater transverse dimensions than said ribs to ensure that a major proportion of said outer surface area is bonded to said cavity by said gap-filling agent; said ribs being integrally formed with said member and having side faces extending radially relative to the hemispherical center of said outer surface to afford dovetail transverse sectional shaping for said ribs to ensure enhanced bonding with said gap-filling agent; and each of said ribs except said one rib being formed with a plurality of transverse passages therethrough and uniformly spaced therearound to communicate neighboring ones of said grooves and ensure uniform distribution of said gap-filling agent.

Claim 5

A device according to claim 2 comprising a disc form end stop extending from that part of said outer surface most remote from said rim, said stop being similar to said ribs in that it extends uniformly and integrally from said outer surface, it has an annular periphery disposed parallel to said rim, it has a side face extending radially relative to said center, and it is spaced from the next adjacent one of said ribs to define an additional one of said grooves.

Claim 6

A device according to Claim 2 made of plastic non-radiographically opaque material, wherein said ribs are transversely grooved in a radial plane symmetrically disposed relative to said inner surface, and comprising an arcuate member of radiographically opaque material received in said grooves.

Claim 7

A device according to Claim 2 made of metal and comprising a substantially hemispherical liner cup of plastic material dimensioned to seat in said inner surface, said inner surface having an annular groove therearound parallel to and adjacent said rim, and a spring circlip received in and projected from said groove to retain said liner cup seated in said inner surface.