US4827919A
Expired / Lapsed
US
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Femoral spacer
Assignee: MTG Divestitures LLC
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Filing: 1986-10-27
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Granted: 1989-05-09
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Expires: 2006-10-27
Abstract
Abstract A femoral spacer for positioning a femoral prosthesis is disclosed comprising a hollow body portion having an outside surface and an inside surface. The outside surface is adapted to contact the intramedullary canal wall, and the inside surface is adapted to contact the proximal portion of the prosthesis such that the prosthesis is substantially centered within the intramedullary canal.
Inventors
- 👤 James L. Barbarito
- 👤 William J. Cymbaluk, Jr.
- 👤 Matthew P. Poggie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:36
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30721; A61F2/30724; A61F2/30728; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/88; A61B17/8802; A61B17/8805; A61B17/8808; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/3008; A61F2002/30729; A61F2/30734; A61F2002/30738; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/30777; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2/46; A61F2002/4631; A61F2250/00; A61F2250/0058; A61F2250/0096; A61F2250/0098
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
A proximal femoral spacer for positioning a femoral prosthesis having a medial collar within the intramedullary canal of a resectioned femur, said spacer comprising a body portion having an outside surface and an inside surface, wherein a substantial portion of the outside surface in use contacts the intramedullary canal wall and a substantial portion of the inside surface contacts a proximal portion of the prosthesis, whereby the proximal portion of the prosthesis is substantially centered within the intramedullary canal but with the medial collar of the prosthesis resting directly on the calcar portion of the resectioned femur, wherein the outside surface of the body portion includes anterior and posterior shoulders, said shoulders having undersides that rest on the femur.
Claim 2
Dependent Claim
119 words
A proximal femoral spacer for positioning a femoral prosthesis having a medial collar within the intramedullary canal of a resectioned femur, said spacer comprising a body portion having an outside surface and an inside surface, wherein a substantial portion of the outside surface in use contacts the intramedullary canal wall and a substantial portion of the inside surface contacts a proximal portion of the prosthesis, whereby the proximal portion of the prosthesis is substantially centered within the intramedullary canal but with the medial collar of the prosthesis resting directly on the calcar portion of the resectioned femur, wherein the outside surface of the body portion includes anterior and posterior shoulders, said shoulders having undersides that rest on the femur.
Claim 3
Dependent Claim
24 words
A spacer according to claim 1 wherein the spacer comprises at least one material selected from the group consisting of polymethyl methacrylate and methylmethacrylate.
Claim 4
Dependent Claim
28 words
A spacer according to claim 1 wherein the outside surface is substantially congruent with the femoral canal, and the inside surface is substantially congruent with the femoral prosthesis.
Claim 5
Dependent Claim
14 words
A spacer according to claim 2 wherein the body portion comprises a radiopaque material.
Claim 6
Dependent Claim
72 words
A method of positioning the proximal shoulder area of a femoral stem prosthesis in a femoral canal comprising the steps of: (1) providing a device of claim 1, (2) reaming the femoral canal, (3) filling the femoral canal with bone cement, (4) placing the device into the bone cement so that the outside contacts the intramedullary canal wall, and (5) inserting the femoral stem prosthesis into the filled canal through the device.
Claim 7
Dependent Claim
13 words
A spacer according to claim 1, wherein said body portion is substantially annular-shaped.
Claim 8
Dependent Claim
22 words
A spacer according to claim 1, wherein said outer surface and said inner surface of said spacer are substantially smooth and unperforated.
Claim 9
Dependent Claim
13 words
A spacer according to claim 4, wherein said radiopaque material comprises barium sulfate.
Claim 10
Dependent Claim
27 words
A spacer according to claim 1, wherein said body portion has a slit located therein which enables said spacer to be placed into an irregular-shaped intramedullary canal.
Claim 11
Dependent Claim
51 words
A spacer according to claim 6, wherein said body portion includes also a bore located between said inside surface and said outside surface, said bore enabling excess bone cement to be to added to or removed from the intramedullary canal during the procedure of filling the femoral canal with bone cement.
References Cited (Backward Citations)
US2785673A
Cited
US2719522A
Cited
US4077070A
Cited
US3820167A
Cited
US3829904A
Cited
US3943576A
Cited
US3848272A
Cited
US3846846A
Cited
US3996625A
Cited
US4187559A
Cited
US4012796A
Cited
US4080666A
Cited
US4064567A
Cited
US4231120A
Cited
US4302855A
Cited
US4459708A
Cited
US4292694A
Cited
US4292695A
Cited
US4357716A
Cited
US4404692A
Cited
WO1983002555A1
Cited
US4661112A
Cited
WO1988001854A1
Cited
US4770660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |