US5314493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Femoral hip joint prosthesis
Assignee: Zimmer Technology Inc
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Filing: 1992-09-10
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Granted: 1994-05-24
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Expires: 2012-09-10
Abstract
Abstract A femoral hip joint prosthesis includes a metal component having a double tapered stem and a preapplied cement mantle with an integral centralizer.
Inventors
- 👤 W. E. Michael Mikhail
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:43
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; A61F2/30767; A61F2/30907; A61F2/32; A61F2/36; A61F2/30771; A61F2/3609; A61F2/3662; A61F2/367; A61F2/3676; A61F2/46; A61F2/4603; A61F2002/30001; A61F2002/30316; A61F2002/30535; A61F2002/30565; A61F2002/30571; A61F2002/30579; A61F2/30734; A61F2002/30738; A61F2002/30878; A61F2002/30884; A61F2002/30891; A61F2002/30892; A61F2002/30919; A61F2002/4631; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00029; A61F2310/00389; A61F2310/00952
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
140 words
A femoral hip joint prosthesis for insertion into a prepared intramedullary canal comprising: (a) a structural member formed of metal and having an elongated stem extending from a proximal end to a distal end, said stem tapering from larger to progressively smaller cross-sectional sizes from said proximal end to said distal end, said stem having surfaces with a polished finish; and (b) a preapplied cement mantle on said surfaces, in direct engagement with said surfaces forming a non-bonded interfacial relationship therewith which permits subsidence of said stem within said preapplied cement mantle, said cement mantle extending beyond the end of said distal end and including an integral centralizer, said centralizer including outwardly extending means engageable with said prepared intramedullary canal and having a closed end defining a pocket, said centralizer closed end being spaced distally from said stem distal end.
Claim 2
Dependent Claim
140 words
A femoral hip joint prosthesis for insertion into a prepared intramedullary canal comprising: (a) a structural member formed of metal and having an elongated stem extending from a proximal end to a distal end, said stem tapering from larger to progressively smaller cross-sectional sizes from said proximal end to said distal end, said stem having surfaces with a polished finish; and (b) a preapplied cement mantle on said surfaces, in direct engagement with said surfaces forming a non-bonded interfacial relationship therewith which permits subsidence of said stem within said preapplied cement mantle, said cement mantle extending beyond the end of said distal end and including an integral centralizer, said centralizer including outwardly extending means engageable with said prepared intramedullary canal and having a closed end defining a pocket, said centralizer closed end being spaced distally from said stem distal end.
Claim 3
Dependent Claim
37 words
The femoral hip joint prosthesis according to claim 1, wherein said means engageable with said prepared intramedullary canal includes a plurality of wings extending outwardly in a direction away from said stem and toward said proximal end.
Claim 4
Dependent Claim
26 words
The femoral hip joint prosthesis according to claim 1, wherein said preapplied cement mantle extends intermittently in areas in direct engagement with said polished finish surfaces.
Claim 5
Dependent Claim
49 words
The femoral hip joint prosthesis according to claim 3, wherein said preapplied cement mantle includes a proximal portion in non-bonded interfacial relationship with said stem surfaces in the area of said proximal end and a distal portion in non-bonded interfacial relationship with said stem surfaces at said distal end.
Claim 6
Dependent Claim
27 words
The femoral hip joint prosthesis according to claim 4, wherein said proximal portion of said cement mantle is connected to said distal portion of said cement mantle.
Claim 7
Dependent Claim
27 words
The femoral hip joint prosthesis according to claim 4, wherein said proximal portion of said cement mantle is separate from said distal portion of said cement mantle.
Claim 8
Dependent Claim
141 words
A femoral hip joint prosthesis for insertion into a prepared intramedullary canal comprising: (a) a structural member formed of a cobalt chrome molybdenum alloy and having an elongated stem extending from a proximal end to a distal end, said stem tapering from larger to progressively smaller cross-sectional sizes from said proximal end to said distal end, said stem having surfaces with a polished finish; and (b) a preapplied cement mantle on said surfaces, in direct engagement with said surfaces forming a non-bonded interfacial relationship therewith which permits subsidence of said stem within said preapplied cement mantle, said cement mantle extending beyond the end of said distal end and including an integral centralizer, said centralizer including means engageable with said prepared intramedullary canal and having a closed end defining a pocket, said centralizer closed end being spaced from said stem distal end.
Claim 9
Dependent Claim
141 words
A femoral hip joint prosthesis for insertion into a prepared intramedullary canal comprising: (a) a structural member formed of a cobalt chrome molybdenum alloy and having an elongated stem extending from a proximal end to a distal end, said stem tapering from larger to progressively smaller cross-sectional sizes from said proximal end to said distal end, said stem having surfaces with a polished finish; and (b) a preapplied cement mantle on said surfaces, in direct engagement with said surfaces forming a non-bonded interfacial relationship therewith which permits subsidence of said stem within said preapplied cement mantle, said cement mantle extending beyond the end of said distal end and including an integral centralizer, said centralizer including means engageable with said prepared intramedullary canal and having a closed end defining a pocket, said centralizer closed end being spaced from said stem distal end.
Claim 10
Dependent Claim
37 words
The femoral hip joint prosthesis according to claim 7, wherein said means engageable with said prepared intramedullary canal includes a plurality of wings extending outwardly in a direction away from said stem and toward said proximal end.
Claim 11
Dependent Claim
26 words
The femoral hip joint prosthesis according to claim 7, wherein said preapplied cement mantle extends intermittently in areas in direct engagement with said polished finish surfaces.
Claim 12
Dependent Claim
49 words
The femoral hip joint prosthesis according to claim 9, wherein said preapplied cement mantle includes a proximal portion in non-bonded interfacial relationship with said stem surfaces in the area of said proximal end and a distal portion in non-bonded interfacial relationship with said stem surfaces at said distal end.
Claim 13
Dependent Claim
27 words
The femoral hip joint prosthesis according to claim 10, wherein said proximal portion of said cement mantle is connected to said distal portion of said cement mantle.
Claim 14
Dependent Claim
27 words
The femoral hip joint prosthesis according to claim 10, wherein said proximal portion of said cement mantle is separate from said distal portion of said cement mantle.
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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) | 1997-05-23 | 1997-11-22 | 1998-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-23 | 2001-11-22 | 2002-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-23 | 2005-11-22 | 2006-05-24 | $7700.00 | Window Closed / Lapsed |