EP0094743A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A femoral component for a hip prosthesis
Assignee: Harris William H
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Filing: 1983-04-18
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Granted: —
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Expires: 2003-04-18
Abstract
Abstract A stemmed femoral component 10 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 18 which is elongate and has on its proximal end a Morse cone 10 and a laterally extending collar 22 adapted to reside on the cortical bone 24 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 42 and only on the anterior, posterior and lateral surfaces 28, 29, 30. The medial surface is smooth 32, as is the diaphyseal portion 40 of the stem 18. In this manner, bony ingrowth takes place only in regions that can be reached with a osteotone for removal. A threaded extractor 52 and mating hole 51 in a driving platform may also be provided for removal.
Inventors
- 👤 William H. Harris
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 14:36
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: 12
Claim 1
Independent Claim
250 words
A femoral component for a hip prosthesis for a human hip comprising: an elongate femoral stem (18) adapted to be fitted into a medullary canal of a femur bone (12), the femoral stem (18) having an upper or metaphyseal portion (42) adapted to be placed in a medullary area of the femur (12) and a lower or diaphyseal portion (40) adapted to extend to an isthmus of the medullary canal of the femur, the metaphyseal portion (42) of the stem (18) having anterior, posterior, lateral and medial surfaces (28,29,30,32); a collar (22) formed on a proximal end of the stem (18) adjacent the metaphyseal portion (42) thereof and extending transversely of the direction of elongation of the stem (18), the collar (22) extending transversely beyond only a selected one or more of the anterior, posterior, lateral and medial surfaces (28,29,30,32) on the proximal end of the stem (18), and the collar (22) not extending transversely beyond the surfaces (28,29,30,32) of the metaphyseal portion (42) of the stem (18) other than the said selected ones of the said anterior, posterior, lateral and medial surfaces (28,29,30,32) and; porous means, for permitting bony ingrowth from the proximal end of the femur (12) to the stem (18), provided only on the said other surfaces of said metaphyseal portion (42) of the stem (18), the said selected ones of the said anterior, posterior, lateral and medial surfaces (28,29, 30,32) being smooth so as to prevent bony ingrowth from the femur (12) to the stem (18).
Claim 2
Dependent Claim
250 words
A femoral component for a hip prosthesis for a human hip comprising: an elongate femoral stem (18) adapted to be fitted into a medullary canal of a femur bone (12), the femoral stem (18) having an upper or metaphyseal portion (42) adapted to be placed in a medullary area of the femur (12) and a lower or diaphyseal portion (40) adapted to extend to an isthmus of the medullary canal of the femur, the metaphyseal portion (42) of the stem (18) having anterior, posterior, lateral and medial surfaces (28,29,30,32); a collar (22) formed on a proximal end of the stem (18) adjacent the metaphyseal portion (42) thereof and extending transversely of the direction of elongation of the stem (18), the collar (22) extending transversely beyond only a selected one or more of the anterior, posterior, lateral and medial surfaces (28,29,30,32) on the proximal end of the stem (18), and the collar (22) not extending transversely beyond the surfaces (28,29,30,32) of the metaphyseal portion (42) of the stem (18) other than the said selected ones of the said anterior, posterior, lateral and medial surfaces (28,29,30,32) and; porous means, for permitting bony ingrowth from the proximal end of the femur (12) to the stem (18), provided only on the said other surfaces of said metaphyseal portion (42) of the stem (18), the said selected ones of the said anterior, posterior, lateral and medial surfaces (28,29, 30,32) being smooth so as to prevent bony ingrowth from the femur (12) to the stem (18).
Claim 3
Dependent Claim
51 words
A femoral component as claimed in claim 1 wherein the selected one or more of the anterior, posterior, lateral and medial surfaces (28,29,30,32) comprises the medial side (32)of the stem (18), and the said others of the said surfaces comprise the anterior, posterior and lateral surfaces (28,29,30) of the stem (18).
Claim 4
Dependent Claim
30 words
A femoral component as claimed in claim 1 or claim 2 wherein the diaphyseal portion (40) of the stem (18) is provided with a smooth surface to prevent bony ingrowth.
Claim 5
Dependent Claim
37 words
A femoral component as claimed in claim 1, claim 2 or claim 3 wherein the collar (22) comprises porous means disposed on an undersurface thereof adjacent the femur (12) for permitting bony ingrowth from the femur (12).
Claim 6
Dependent Claim
20 words
A femoral component as claimed in any preceding claim wherein the metaphyseal portion (42) has a generally rectangular cross-sectional shape.
Claim 7
Dependent Claim
20 words
A femoral component as claimed in any preceding claim wherein the diaphyseal portion (40) has a generally circular cross-sectional shape.
Claim 8
Dependent Claim
30 words
A femoral component as claimed in any preceding claim wherein the material of the said other surfaces of the metaphyseal portion (42) has been textured to form the porous means.
Claim 9
Dependent Claim
33 words
A femoral component as claimed in any preceding claim wherein the porous means comprise a layer of porous material affixed to the stem (18) on the said surfaces of the metaphyseal portion (42).
Claim 10
Dependent Claim
28 words
A femoral component as claimed in any preceding claim wherein the porous means are provided with pores having a size in the range of 150 to 1000 microns.
Claim 11
Dependent Claim
47 words
A femoral component as claimed in any preceding claim further comprising threaded removal means (51) disposed on the metaphyseal portion (42) of the stem (18) adjacent the collar (22) adapted for attachment to extrator means (52) for removal of the stem (18) from the femur bone (12).
Claim 12
Dependent Claim
70 words
A femoral component as claimed in any preceding claim further comprising: a removable femoral head (16) securable to the proximal end of the component (20) adjacent the meatphyseal portion (42) of the stem (18) above the collar (22); and a neck (20) provided on the proximal end of the stem (18) and a recess provided in the head (16) for receiving the neck (20) for removably supporting the head (16).
References Cited (Backward Citations)
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