US4406023A
Expired / Lapsed
US
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Stemmed femoral component for the human hip
Assignee: Zimmer Technology Inc
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Filing: 1982-04-19
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Granted: 1983-09-27
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Expires: 2002-04-19
Abstract
Abstract A stemmed femoral component for the human hip for which fixation is provided by bony ingrowth and which may be easily removed for replacement thereof by an osteotone. The two-piece component includes a stem which is elongated and has on its proximal end a Morse cone and a laterally extending collar adapted to reside on the cortical bone in the region of the femoral neck. The stem is textured or provided with a porous material on its outer surfaces only in the metaphyseal portion and only on the anterior, lateral, and posterior surfaces. The medial surface is smooth, as is the diaphyseal portion of the stem. In this manner, bony ingrowth takes place only in regions that can be reached with a osteotone for removal. A threaded extractor and mating hole in a driving platform may also be provided for removal.
Inventors
- 👤 William H. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:59
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/30767; A61F2/3662; A61F2/367; A61F2/46; A61F2/4603; A61F2/4607; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30138; A61F2002/30153; A61F2002/30316; A61F2002/30317; A61F2002/30322; A61F2002/30329; A61F2002/30331; A61F2002/30332; A61F2002/30405; A61F2/30771; A61F2002/30795; A61F2002/30797; A61F2/3094; A61F2002/30968; A61F2/3609; A61F2002/3611; A61F2002/3625; A61F2002/3631; A61F2002/365; A61F2002/4619; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0017; A61F2230/0019; A61F2250/00; A61F2250/0014; A61F2250/0026; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; A61F2310/00029; A61F2310/00389; A61F2310/00592; A61F2310/00952
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
223 words
A femoral component for hip prostheses for the human hip comprising: an elongated femoral stem adapted to be inserted into a medullary canal of a femur bone of a human being, said femoral stem having a metaphyseal portion adapted to be placed in a medullary area of the femur and a diaphyseal portion adapted to extend to an isthmus of the medullary canal of the femur, the metaphyseal portion of the stem having lateral, medial, anterior and posterior surfaces; porous means disposed on the lateral, posterior and anterior surfaces of said metaphyseal portion of said stem for permitting bony ingrowth from the proximal end of the femur into said stem, the medial surface of the metaphyseal portion of the stem and all external surfaces of the diaphyseal portion of the stem being smooth so as to prevent bony ingrowth from the femur to said stem in the diaphyseal portion and on the medial surface of the metaphyseal portion of said stem; and a collar disposed on the proximal end of said stem adjacent said metaphyseal portion thereof and extending transversely of the direction of elongation of said stem beyond the medial surface but not beyond the lateral, posterior and anterior surfaces for enabling a direct osteotomy to be performed on the lateral, anterior and posterior surfaces of the metaphyseal portion of the stem.
Claim 2
Dependent Claim
223 words
A femoral component for hip prostheses for the human hip comprising: an elongated femoral stem adapted to be inserted into a medullary canal of a femur bone of a human being, said femoral stem having a metaphyseal portion adapted to be placed in a medullary area of the femur and a diaphyseal portion adapted to extend to an isthmus of the medullary canal of the femur, the metaphyseal portion of the stem having lateral, medial, anterior and posterior surfaces; porous means disposed on the lateral, posterior and anterior surfaces of said metaphyseal portion of said stem for permitting bony ingrowth from the proximal end of the femur into said stem, the medial surface of the metaphyseal portion of the stem and all external surfaces of the diaphyseal portion of the stem being smooth so as to prevent bony ingrowth from the femur to said stem in the diaphyseal portion and on the medial surface of the metaphyseal portion of said stem; and a collar disposed on the proximal end of said stem adjacent said metaphyseal portion thereof and extending transversely of the direction of elongation of said stem beyond the medial surface but not beyond the lateral, posterior and anterior surfaces for enabling a direct osteotomy to be performed on the lateral, anterior and posterior surfaces of the metaphyseal portion of the stem.
Claim 3
Dependent Claim
29 words
A femoral component as recited in claim 1 wherein said collar comprises porous means disposed on an undersurface thereof adjacent the femur for permitting bony ingrowth from the femur.
Claim 4
Dependent Claim
18 words
A femoral component as recited in claim 1 wherein said metaphyseal portion has a generally rectangular cross-sectional shape.
Claim 5
Dependent Claim
18 words
A femoral component as recited in claim 1 wherein said diaphyseal portion has a generally circular cross-sectional shape.
Claim 6
Dependent Claim
30 words
A femoral component as recited in claim 1 wherein the material of said lateral, posterior and anterior surfaces of said metaphyseal portion has been textured to form said porous means.
Claim 7
Dependent Claim
33 words
A femoral component as recited in claim 1 wherein said porous means comprise a layer of porous material affixed to said stem on said lateral, posterior and anterior surfaces of said metaphyseal portion.
Claim 8
Dependent Claim
27 words
A femoral component as recited in claim 1 wherein said porous means are provided with pores having a size in the range of 150 to 1000 microns.
Claim 9
Dependent Claim
39 words
A femoral component as recited in claim 1 further comprising threaded removal means disposed on said metaphyseal portion of said stem adjacent said collar adapted for attachment to extractor means for removal of said stem from the femur bone.
Claim 10
Dependent Claim
178 words
A femoral component for a hip prosthesis for the human hip comprising: a femoral stem adapted to fit into the medullary canal of the femur, said femoral stem having an upper portion and a lower portion, said upper portion having lateral medial, anterior and posterior surfaces; a collar formed on a proximal end of the stem adjacent the upper portion thereof and extending transversely of the direction of elongation of the stem, said collar extending transversely beyond only selected ones of said lateral, medial, anterior and posterior surfaces on the proximal end of the stem, and said collar not extending transversely beyond surfaces of said upper portion of said stem other than said selected ones of said lateral, medial, anterior and posterior surfaces; porous means for permitting bony ingrowth provided only on said other surfaces of said upper portion of and stem, said selected ones of said lateral, medial, anterior and posterior surfaces and the outer surfaces of said lower portion of said stem being smooth so as to prevent only ingrowth from the femur to said stem.
Claim 11
Dependent Claim
178 words
A femoral component for a hip prosthesis for the human hip comprising: a femoral stem adapted to fit into the medullary canal of the femur, said femoral stem having an upper portion and a lower portion, said upper portion having lateral medial, anterior and posterior surfaces; a collar formed on a proximal end of the stem adjacent the upper portion thereof and extending transversely of the direction of elongation of the stem, said collar extending transversely beyond only selected ones of said lateral, medial, anterior and posterior surfaces on the proximal end of the stem, and said collar not extending transversely beyond surfaces of said upper portion of said stem other than said selected ones of said lateral, medial, anterior and posterior surfaces; porous means for permitting bony ingrowth provided only on said other surfaces of said upper portion of and stem, said selected ones of said lateral, medial, anterior and posterior surfaces and the outer surfaces of said lower portion of said stem being smooth so as to prevent only ingrowth from the femur to said stem.
Claim 12
Dependent Claim
55 words
A femoral component as recited in claim 9 further comprising: a removable femoral head secured to the proximal end adjacent the upper portion of said stem above said collar; a neck provided on said proximal end of said stem and a recess provided in said head for receiving said neck for removably supporting said head.
Claim 13
Dependent Claim
48 words
A femoral component as recited in claim 9 wherein said selected ones of said lateral, medial, anterior and posterior surfaces comprises said medial side of said stem, and said others of said lateral, medial, anterior and posterior surfaces comprised said anterior, lateral and posterior surfaces of said stem.
Claim 14
Dependent Claim
21 words
A femoral component as recited in claim 9 wherein said lower portion of said stem is provided with a smooth surface.
Claim 15
Dependent Claim
34 words
A femoral component as recited in claim 1 further comprising: a femoral neck disposed on the proximal end of said stem adjacent said collar; and a spherical femoral head removably secured to said neck.
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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) | 1986-09-26 | 1987-03-28 | 1987-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-26 | 1991-03-28 | 1991-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-26 | 1995-03-28 | 1995-09-27 | $7700.00 | Window Closed / Lapsed |