Patent US5989261A successfully refreshed from Google Patents.
US5989261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Evaluating the fit of an orthopaedic implant
Assignee: Zimmer Ltd
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Filing: 1997-07-29
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Granted: 1999-11-23
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Expires: 2017-07-29
Abstract
Abstract The invention provides means for evaluating the fit of a knee replacement prosthesis on a resected tibial surface. A provisional instrument for this purpose includes a positioning tray having a peripheral profile corresponding to that of the tibial platform of the prosthesis, the tray having an upper surface and an under surface which is substantially flat and free from projections and the tray having a plurality of holes for receiving pins for temporarily attaching the positioning tray in a desired position on the resected tibial surface. Also disclosed is a jig for guiding, drilling and broaching operations, the jig having an aperture which is shaped to guide the broach. In addition, the invention includes a tibial broach which includes a hollow body having an upper end and a lower end and having an anvil at its upper end, an interior face and a posterior face which slopes downwardly towards a lower end, the posterior face having a series of teeth which are formed in the hollow body, such that bone cut by the teeth as the broach is driven into an intramedullary canal of a tibia passes into the hollow body.
Inventors
- 👤 Peter Stanley Walker
- 👤 John Nevil Insall
- 👤 Jonathan Blamey
- 👤 Michael Wadcock
- 👤 Mark Alan Heldreth
- 👤 Shawn Elliott McGinley
- 👤 Steven A. Zawadzki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:50
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/16; A61B17/1662; A61B17/1675; A61B17/1659; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/46; A61F2/4684; A61B17/14; A61B17/15; A61B17/154; A61B17/157; A61F2/38; A61F2/3859; A61F2/3872; A61F2/389; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30182; A61F2002/30187; A61F2002/30316; A61F2002/30329; A61F2002/30383; A61F2002/3039; A61F2002/30392; A61F2002/30393; A61F2002/30398; A61F2002/304; A61F2/30767; A61F2/30771; A61F2002/30878; A61F2220/00; A61F2220/0025; A61F2230/00; A61F2230/0002; A61F2230/0028; A61F2230/0034
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
114 words
A provisional instrument component for evaluating the fit of a knee replacement prosthesis on a resected tibial surface, said component comprising a positioning tray having a peripheral profile corresponding to that of a tibial platform of the prosthesis, the tray having an upper surface and an under surface which is substantially flat and free from projections and said tray having a plurality of holes for receiving pins for temporarily attaching the positioning tray in a desired position on said resected tibial surface, wherein a boss is carried on the upper surface of the tray for guiding a temporary plastics meniscal bearing component on said upper surface with freedom of movement in the anterior-posterior direction.
Claim 2
Dependent Claim
114 words
A provisional instrument component for evaluating the fit of a knee replacement prosthesis on a resected tibial surface, said component comprising a positioning tray having a peripheral profile corresponding to that of a tibial platform of the prosthesis, the tray having an upper surface and an under surface which is substantially flat and free from projections and said tray having a plurality of holes for receiving pins for temporarily attaching the positioning tray in a desired position on said resected tibial surface, wherein a boss is carried on the upper surface of the tray for guiding a temporary plastics meniscal bearing component on said upper surface with freedom of movement in the anterior-posterior direction.
Claim 3
Dependent Claim
129 words
An instrument kit for fitting and evaluating the fit of a knee replacement prosthesis on a resected tibial surface, which comprises a tibial sizing and positioning tray having a plurality of holes therein for receiving pins for temporarily attaching the positioning tray in a desired position on said resected tibial surface and a jig for a tibial broach having a peripheral profile which corresponds with said positioning tray and having locating holes which correspond with the holes in said positioning tray, the jig also having an aperture which is shaped to guide the broach, the positioning tray having a peripheral profile corresponding to that of the tibial platform of the prosthesis, the tray having an upper surface and an under surface which is substantially flat and free from projections.
Claim 4
Dependent Claim
129 words
An instrument kit for fitting and evaluating the fit of a knee replacement prosthesis on a resected tibial surface, which comprises a tibial sizing and positioning tray having a plurality of holes therein for receiving pins for temporarily attaching the positioning tray in a desired position on said resected tibial surface and a jig for a tibial broach having a peripheral profile which corresponds with said positioning tray and having locating holes which correspond with the holes in said positioning tray, the jig also having an aperture which is shaped to guide the broach, the positioning tray having a peripheral profile corresponding to that of the tibial platform of the prosthesis, the tray having an upper surface and an under surface which is substantially flat and free from projections.
Claim 5
Dependent Claim
93 words
A tibial broach which comprises a hollow body having an upper end and a lower end, the hollow body being closed at its upper end and having an open lower end whose edges are sharpened, said hollow body having an anterior face and a posterior face which slopes downwardly and inwardly towards said lower end, wherein said posterior face is formed with a series of teeth adapted to cut bone on driving the broach into a tibia, said posterior face having apertures permitting bone cut by the teeth to enter the hollow body.
Claim 6
Dependent Claim
93 words
A tibial broach which comprises a hollow body having an upper end and a lower end, the hollow body being closed at its upper end and having an open lower end whose edges are sharpened, said hollow body having an anterior face and a posterior face which slopes downwardly and inwardly towards said lower end, wherein said posterior face is formed with a series of teeth adapted to cut bone on driving the broach into a tibia, said posterior face having apertures permitting bone cut by the teeth to enter the hollow body.
Claim 7
Dependent Claim
49 words
A broach as claimed in claim 3 wherein said hollow body has substantially parallel lower lateral and medial faces and upper lateral and medial faces which slope upwardly and outwardly towards the upper end of the lower body, the upper lateral and medial faces being formed with cutting teeth.
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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) | 2002-11-22 | 2003-05-24 | 2003-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-11-22 | 2007-05-24 | 2007-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-11-22 | 2011-05-24 | 2011-11-23 | $7700.00 | Window Closed / Lapsed |