US4883491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous-coated artificial joints
Assignee: Joint Medical Products Corp
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Filing: 1988-10-06
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Granted: 1989-11-28
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Expires: 2008-10-06
Abstract
Abstract Artificial joint prostheses are provided whose outer surfaces include a screw thread which is interrupted by porous-coated columns so as to produce an alternating pattern of threaded columns adjacent to porous-coated columns. The threaded columns provide initial mechanical fixation of the prosthesis to bone and the porous-coated columns provide long-term fixation through bone ingrowth.
Inventors
- 👤 Thomas H. Mallory
- 👤 Timothy McTighe
- 👤 Douglas G. Noiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:48
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30721; A61F2/30734; A61F2/30767; A61F2/32; A61F2/34; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61F2/3094; A61F2/36; A61F2/3662; A61F2/367; A61F2/3676; A61F2/38; A61F2/40; A61F2/42; A61F2/4241; A61F2002/30001; A61F2002/30108; A61F2002/30199; A61F2002/30242; A61F2002/30316; A61F2002/30317; A61F2002/30322; A61F2002/30329; A61F2002/30331; A61F2002/30332; A61F2002/30476; A61F2002/30492; A61F2002/30535; A61F2002/30537; A61F2002/30538; A61F2002/3054; A61F2002/30594; A61F2002/30738; A61F2002/30769; A61F2/30771; A61F2002/30772; A61F2002/30784; A61F2002/30785; A61F2002/3085; A61F2002/30858; A61F2002/30871; A61F2002/30873; A61F2/30942; A61F2002/30952; A61F2002/3401; A61F2002/3403; A61F2002/3412; A61F2002/342; A61F2/3609; A61F2002/365; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2230/00; A61F2230/0063; A61F2230/0071; A61F2250/00; A61F2250/0014; A61F2250/0026; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; A61F2310/00389; A61F2310/00395; A61F2310/00407
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
162 words
A prosthesis comprising a cup for use as part of an artificial ball and socket joint, said cup having a spherically-shaped outside surface upon which is formed a screw thread for engagement with bone, said outside including a dome portion and a base portion, the dome portion being porous-coated and the base portion including (a) the screw thread and (b) a plurality of porous-coated columns which extends from the dome portion into the region of the base of the cup where the cup is of greatest width, the outer surface of the porous-coated column lying substantially on the same sphere as the outer surface of the porous-coated dome, said screw thread being free of porous coating and being interrupted by the porous-coated columns so as to produce an alternating pattern of threaded columns adjacent to porous-coated columns, the threaded columns providing initial mechanical fixation of the prosthesis to the bone and the porous-coated columns allowing long-term fixation through bone ingrowth and remodeling.
Claim 2
Dependent Claim
162 words
A prosthesis comprising a cup for use as part of an artificial ball and socket joint, said cup having a spherically-shaped outside surface upon which is formed a screw thread for engagement with bone, said outside including a dome portion and a base portion, the dome portion being porous-coated and the base portion including (a) the screw thread and (b) a plurality of porous-coated columns which extends from the dome portion into the region of the base of the cup where the cup is of greatest width, the outer surface of the porous-coated column lying substantially on the same sphere as the outer surface of the porous-coated dome, said screw thread being free of porous coating and being interrupted by the porous-coated columns so as to produce an alternating pattern of threaded columns adjacent to porous-coated columns, the threaded columns providing initial mechanical fixation of the prosthesis to the bone and the porous-coated columns allowing long-term fixation through bone ingrowth and remodeling.
Claim 3
Dependent Claim
17 words
The prosthesis of claim 1 wherein the porous-coated columns and the threaded columns have approximately equal areas.
Claim 4
Dependent Claim
49 words
The prosthesis of claim 1 wherein the outer surfaces of the porous-coated columns lie substantially in or slightly above the surface of revolution defined by the root of the screw thread so that the porous-coated regions come into contact with bone as the prosthesis is screwed into the bone.
Claim 5
Dependent Claim
11 words
The prosthesis of claim 1 wherein the screw thread is self-tapping.
Claim 6
Dependent Claim
125 words
A prosthesis comprising a cup for use as part of an artificial ball and socket joint, said cup having an outside surface upon which is formed a screw thread for engagement with bone, said outside surface including a dome which is porous-coated and a base where the cup is of greatest width, the screw thread being formed in the region of the base and being interrupted by porous-coated columns which extend from the dome into the region of the base so as to produce an alternating pattern of threaded columns adjacent to porous-coated columns, the threaded columns being free of porous coating and providing initial mechanical fixation of the prosthesis to the bone and the porous-coated columns allowing long-term fixation through bone ingrowth and remodeling.
Claim 7
Dependent Claim
125 words
A prosthesis comprising a cup for use as part of an artificial ball and socket joint, said cup having an outside surface upon which is formed a screw thread for engagement with bone, said outside surface including a dome which is porous-coated and a base where the cup is of greatest width, the screw thread being formed in the region of the base and being interrupted by porous-coated columns which extend from the dome into the region of the base so as to produce an alternating pattern of threaded columns adjacent to porous-coated columns, the threaded columns being free of porous coating and providing initial mechanical fixation of the prosthesis to the bone and the porous-coated columns allowing long-term fixation through bone ingrowth and remodeling.
Claim 8
Dependent Claim
17 words
The prosthesis of claim 5 wherein the porous-coated columns and the threaded columns have approximately equal areas.
Claim 9
Dependent Claim
49 words
The prosthesis of claim 5 wherein the outer surfaces of the porous-coated columns lie substantially in or slightly above the surface of revolution defined by the root of the screw thread so that the porous-coated regions cone into contact with bone as the prosthesis is screwed into the bone.
Claim 10
Dependent Claim
11 words
The prosthesis of claim 5 wherein the screw thread is self-tapping.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |