Patent US4459985A successfully refreshed from Google Patents.
US4459985A
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Tibial prosthesis extractor and method for extracting a tibial implant
Assignee: Howmedica Osteonics Corp
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Filing: 1983-03-04
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Granted: 1984-07-17
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Expires: 2003-03-04
Abstract
Abstract An extractor for dislodging an implanted tibial prosthesis comprising substantially parallel upper and lower members joined by a yoke, with the lower member comprising a pair of forked blades to insert under the tibial component and the upper member being adapted to receive means for applying upward dislodging force.
Inventors
- 👤 William F. McKay
- 👤 Peter B. Van Syckle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:57
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/46; A61F2/4603; A61F2/461; A61F2002/4619; A61F2002/4625; A61F2002/4628
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
An extractor for dislodging an implanted tibial prosthesis having a tibial tray and stem, said device comprising substantially parallel upper and lower member joined by a yoke at one end thereof, said members being sufficiently spaced by said yoke to admit said tibial tray therebetween, said lower member comprising a pair of forked blades for insertion between said tray and the proximal end of the tibia, straddling said stem, and said upper member being adapted to receive means for applying upward dislodging force to said tray in substantially axial alignment with said stem to extract said prosthesis from said tibia.
Claim 2
Dependent Claim
100 words
An extractor for dislodging an implanted tibial prosthesis having a tibial tray and stem, said device comprising substantially parallel upper and lower member joined by a yoke at one end thereof, said members being sufficiently spaced by said yoke to admit said tibial tray therebetween, said lower member comprising a pair of forked blades for insertion between said tray and the proximal end of the tibia, straddling said stem, and said upper member being adapted to receive means for applying upward dislodging force to said tray in substantially axial alignment with said stem to extract said prosthesis from said tibia.
Claim 3
Dependent Claim
22 words
The extractor of claim 1 wherein said upper member is adapted to attach an impact device thereto for applying said dislodging force.
Claim 4
Dependent Claim
21 words
The extractor of claim 1 having anchoring means for fixed securement to said tibial tray while said dislodging force is applied.
Claim 5
Dependent Claim
24 words
The extractor of claim 3 wherein said anchoring means is a pointed screw threaded therethrough for engaging a plastic insert in said tibial tray.
Claim 6
Independent Claim
64 words
A method for extracting a tibial implant having a tibial tray and stem comprising excising a layer of proximal tibial bone immediately below said tibial tray, inserting fork means into the space so created between the tray and the proximal tibia surface, straddling said stem, and transmitting impact shock to said tray through said fork means in a direction substantially coaxial with said stem.
Claim 7
Independent Claim
64 words
A method for extracting a tibial implant having a tibial tray and stem comprising excising a layer of proximal tibial bone immediately below said tibial tray, inserting fork means into the space so created between the tray and the proximal tibia surface, straddling said stem, and transmitting impact shock to said tray through said fork means in a direction substantially coaxial with said stem.
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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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |