EP0579868A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Femoral rod for a complete hip prosthesis
Assignee: Howmedica International Divne Pfizer Italiana SpA
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Filing: 1992-11-25
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Granted: —
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Expires: 2012-11-25
Abstract
Abstract A femoral rod (1) comprising a shank (2) inserted inside the femur; a head (5) for the articulation of the femur; and means (9) for transferring the physiological loads normally supported by the femur on to a section (11) of the femoral neck (10) immediately below the head of the femur; which means consist of a transversely projecting collar (13) at the proximal end of the shank (2), of substantially the same external shape and size as the neck (10) below the head of the femur.
Inventors
- 👤 Pasquale Mario Calderale
- 👤 Francesco Pipino
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 20:19
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662; A61F2/30767; A61F2/30771; A61F2/30907; A61F2/3609; A61F2/3676; A61F2/30721; A61F2/30734; A61F2/3094; A61F2/30965; A61F2/34; A61F2/367; A61F2/3672; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30062; A61F2002/30064; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30332; A61F2002/30535; A61F2002/30604; A61F2002/3082; A61F2002/30909; A61F2002/30919; A61F2002/3625; A61F2002/3631; A61F2002/3678; A61F2002/3686; A61F2210/00; A61F2210/0004; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2310/00; A61F2310/00389; A61F2310/00592; A61F2310/00796
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
65 words
A femoral rod (1) for a complete hip prosthesis, comprising a shank (2) inserted inside the femur (4), and a head (5) for the articulation of the femur (4); characterized by the fact that it comprises means (9) for transferring the physiological loads normally supported by the femur (4) on to a section (11) of the neck (10) immediately below the head of the femur.
Claim 2
Dependent Claim
48 words
A rod as claimed in Claim 1, characterized by the fact that said means (9) consist of a transversely projecting collar (13) at the top end of said shank (2), of substantially the same external shape and size as the neck (10) below the head of the femur.
Claim 3
Dependent Claim
69 words
A rod as claimed in Claim 1 or 2, characterized by the fact that said shank (2) comprises a proximal or top portion (14) immediately below said collar (13) and having a substantially straight axis a p ; a mid portion (15) adjacent to said proximal portion (14) and having a curved axis a m blending with said axis a p ; and a distal or bottom portion (16).
Claim 4
Dependent Claim
26 words
A rod as claimed in Claim 3, characterized by the fact that said proximal portion (14) tapers slightly towards the bottom end of said shank (2).
Claim 5
Dependent Claim
85 words
A rod as claimed in one of the foregoing Claims, characterized by the fact that, in the front plane, said axis a p of said proximal portion (14) forms an angle of 125-130° with a line tangent to end point M of said curved axis a m of said mid portion (15); and the distance between said point M and the point P at which said straight axis a p intersects the bottom surface (17) of said collar (13) ranges from 80 to 120 mm.
Claim 6
Dependent Claim
31 words
A rod as claimed in one of the foregoing Claims, characterized by the fact that said proximal portion (14) of said shank (2) presents a length of 10 to 20 mm.
Claim 7
Dependent Claim
51 words
A rod as claimed in one of the foregoing Claims, characterized by the fact that the surface (18) of said distal portion (16) is smooth; said distal portion (16) presenting a length ranging from 0.33 to 0.50 of the total length of said shank (2) and having a rounded tip (19).
Claim 8
Dependent Claim
21 words
A rod as claimed in Claim 7, characterized by the fact that the axis of said distal portion (16) is straight.
Claim 9
Dependent Claim
28 words
A rod as claimed in one of the foregoing Claims from 1 to 6, characterized by the fact that the axis of said distal portion (16) is curved.
Claim 10
Dependent Claim
35 words
A rod as claimed in Claim 9, characterized by the fact that said distal portion (16) presents a bevel (20) on the portion of said surface (18) facing the convex side of said shank (2).
Claim 11
Dependent Claim
33 words
A rod as claimed in one of the foregoing Claims, characterized by the fact that the flexibility of said distal portion (16) is greater than that of the rest of said shank (2).
Claim 12
Dependent Claim
20 words
A rod as claimed in Claim 10, characterized by the fact that said distal portion (16) presents radial cavities (21).
Claim 13
Dependent Claim
20 words
A rod as claimed in Claim 11, characterized by the fact that said distal portion (16) presents longitudinal grooves (22).
Claim 14
Dependent Claim
28 words
A rod as claimed in Claim 11, characterized by the fact that said distal portion (16) is made of different material from the rest of said shank (2).
Claim 15
Dependent Claim
29 words
A rod as claimed in one of the foregoing Claims from 7 to 14, characterized by the fact that said distal portion (16) is made of composite synthetic material.
Claim 16
Dependent Claim
58 words
A rod as claimed in one of the foregoing Claims, characterized by the fact that, in the sagittal plane perpendicular to said front plane, the axis of said proximal portion (14) of said shank (2) forms an angle of 10-30° with the axis of the remaining portion of said shank (2); said two axes blending with each other.
Claim 17
Dependent Claim
42 words
A rod as claimed in one of the foregoing Claims, characterized by the fact that the bottom surface (17) of said collar (13) forms an angle of 75-90° with said axis a p of said proximal portion (14) of said shank (2).
Claim 18
Dependent Claim
49 words
A rod as claimed in one of the foregoing Claims, characterized by the fact that, with the exception of said surface (18) of said distal portion (16), said surface (28) of said shank (2) presents means for assisting osteointegration with the spongy bone (25, 35) of the femur (4).
Claim 19
Dependent Claim
43 words
A rod as claimed in Claim 17, characterized by the fact that, with the exception of said surface (18) of said distal portion (16), said surface (28) of said shank (2) presents projections (29) ranging in average size from 0.5 to 1.5 mm.
Claim 20
Dependent Claim
27 words
A rod as claimed in Claim 18, characterized by the fact that said projections (29) are also provided on said bottom surface (17) of said collar (13).
Claim 21
Dependent Claim
38 words
A rod as claimed in Claim 18, characterized by the fact that, with the exception of said surface (18) of said distal portion (16), said surface (28) of said shank (2) presents a 1-2.5 mm mesh net sheath.
Claim 22
Dependent Claim
32 words
A rod as claimed in any one of the foregoing Claims, characterized by the fact that said distal portion (16) of said shank (2) presents a sheath (31) of biodegradable, absorbable material.
Claim 23
Dependent Claim
26 words
A rod as claimed in any one of the foregoing Claims, characterized by the fact that said proximal portion (14) presents a coating (30) of hydroxylapatite.
Claim 24
Independent Claim
185 words
A system enabling articulated connection of the periacetabular bone and the femur, characterized by the fact that it comprises: a femoral rod (1) substantially comprising a shank (2) inserted inside the femur (4); a head (5) extending axially from said shank (2); and a collar (13) projecting transversely from and located at the top end of said shank (2); an acetabular cup (6) fitted to the periacetabular bone, for housing said head (5) of said rod (1) and enabling angular oscillation of the rod (1) in relation to the periacetabular bone; a femoral neck (10) projecting integrally from the femur (4), surrounding a portion of said shank (2) adjacent to said top end, and designed to support said collar (13) of said rod (1); the axial length of the femoral neck (10) being substantially equal to that produced by a resection effected below the head of the femur; the size of said collar (13) of said rod (1), measured in directions lying in the plane defined by said resection, being substantially equal to the thickness of the femoral neck (10) measured in the same directions.
Claim 25
Dependent Claim
24 words
A system as claimed in Claim 24, characterized by the fact that said rod (1) presents the characteristics claimed in Claims 1 to 23.
References Cited (Backward Citations)
No citation records indexed.
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