US4994085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial stem unit for coxa with setting guide
Assignee: Aisin Corp
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Filing: 1989-03-08
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Granted: 1991-02-19
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Expires: 2009-03-08
Abstract
Abstract An artificial stem unit for coxa with a setting guide comprises a stem made of metal to be inserted into the marrow cavity of a femur and a setting guide for fixing the stem in the marrow cavity comprising a cylindrical core rod and a plug attached to the end of the cylindrical core rod. In the operation, the setting guide is inserted into the marrow cavity of the femur in advance for the centering, and thereafter, the stem is inserted so that the through hole of the stem fit with the cylindrical core rod of the setting guide. Then the bone cement is injected to fix the stem at an accurate position set up by the above operation.
Inventors
- 👤 Kazuhiko Sawai
- 👤 Shigeo Niwa
- 👤 Tomokazu Hattori
- 👤 Wataru Yagi
- 👤 Ryohei Yabuno
- 👤 Masami Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:21
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/88; A61B17/8802; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30721; A61F2/30723; A61F2/30724; A61F2/32; A61F2/36; A61F2/3662; A61F2/46; A61F2/4684; A61F2002/30001; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30354; A61F2002/30726; A61F2002/3678; A61F2002/3694; A61F2002/4631; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00017; A61F2310/00023; A61F2310/00029; A61F2310/00179; A61F2310/00185; A61F2310/00203; A61F2310/00239; A61F2310/00293; A61F2310/00353
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
142 words
A femoral prosthesis system comprising an elongated stem defining a central longitudinal axis configured to be inserted and cemented in an intramedullary cavity, said stem having a through bore extending and aligned along the longitudinal axis thereof, said bore having a diameter of about 1.0 to 5.0 mm, and a separate setting guide insertable within the intramedullary cavity before cementing of said stem for aligning the stem in the intramedullary cavity, said setting guide having degassing means and including a cylindrical centering rod and a plug attached to one end of the rod, said rod having an outer diameter sized to slidably fit within the through bore such that the stem is capable of sliding over said rod as the stem is inserted in the intramedullary cavity, whereby proper alignment of said stem is established before the stem is cemented in place.
Claim 2
Dependent Claim
142 words
A femoral prosthesis system comprising an elongated stem defining a central longitudinal axis configured to be inserted and cemented in an intramedullary cavity, said stem having a through bore extending and aligned along the longitudinal axis thereof, said bore having a diameter of about 1.0 to 5.0 mm, and a separate setting guide insertable within the intramedullary cavity before cementing of said stem for aligning the stem in the intramedullary cavity, said setting guide having degassing means and including a cylindrical centering rod and a plug attached to one end of the rod, said rod having an outer diameter sized to slidably fit within the through bore such that the stem is capable of sliding over said rod as the stem is inserted in the intramedullary cavity, whereby proper alignment of said stem is established before the stem is cemented in place.
Claim 3
Dependent Claim
37 words
The prosthesis system of claim 1 wherein said degassing means comprises a bore within said centering rod, and air passages in said plug communicating between the bore in the centering rod and the cavity surrounding the rod.
Claim 4
Dependent Claim
28 words
The prosthesis system of claim 1, wherein said stem is made of metal selected from the group consisting of Ti alloy, Co-Cr-Mo alloy, stainless steel, alumina and zirconia.
Claim 5
Dependent Claim
26 words
The prosthesis system of claim 1, wherein said stem is made of material selected from the group consisting of bone cement, Ti alloy and stainless steel.
References Cited (Backward Citations)
US3846846A
Cited
US3906550A
Cited
US4080666A
Cited
US4337773A
Cited
US4520511A
Cited
EP0143847A1
Cited
WO1986002260A1
Cited
US4657549A
Cited
US4678471A
Cited
EP0331623A1
Cited
US4919673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |