EP0189253A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Press fit knee prosthesis and instrumentation
Assignee: MTG Divestitures LLC
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Filing: 1986-01-09
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Granted: —
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Expires: 2006-01-09
Abstract
Abstract A knee prosthesis for press fit implantation without fixation cement, including a femoral component (10) in which the dual bearing members (12, 14) each have a distal fixation surface (22, 28) which is curvilinear and concave when viewed in sagittal planes. A novel cutting jig (48) and saw blade (98) for preparing the distal femur for implantation of the femoral component are also disclosed. The fixation post (32, 44) of both the femoral and tibial components of the prosthesis is vane shaped in cross section, and the textured fixation surfaces of the components may include a layer (46) of biocompatible felt material for distributing stresses between the component and the prepared bone member.
Inventors
- 👤 Peter Stanley Walker
- 👤 Robert Ernst Miegel
- 👤 William Francis Mckay
- 👤 Frederick C. Ewald
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 11:56
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61B; A61B17/00; A61B17/14; A61B17/15; A61B17/154; A61B17/155
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
122 words
A femoral component (10) for a prosthetic knee joint which comprises a spaced pair of bearing members (12,14) adapted for mutual articulation with an associated tibial component (16) and a bridging portion (18) joining the bearing members (12,14), each of the bearing members (12,14) having joined anterior (20,26), distal (22,28) and posterior (24,30) fixation surfaces adapted to fit against a surgically prepared distal end (25) of a femur when the femoral component (10) is implanted, the anterior (20,26), distal (22,28) and posterior (24,30) fixation surfaces of the bearing members (12,14) being respectively coincident when viewed in sagittal planes, characterized in that at least the distal fixation surface (22,28) of the bearing members (12,14) is curvilinear and concave when viewed in sagittal planes.
Claim 2
Dependent Claim
122 words
A femoral component (10) for a prosthetic knee joint which comprises a spaced pair of bearing members (12,14) adapted for mutual articulation with an associated tibial component (16) and a bridging portion (18) joining the bearing members (12,14), each of the bearing members (12,14) having joined anterior (20,26), distal (22,28) and posterior (24,30) fixation surfaces adapted to fit against a surgically prepared distal end (25) of a femur when the femoral component (10) is implanted, the anterior (20,26), distal (22,28) and posterior (24,30) fixation surfaces of the bearing members (12,14) being respectively coincident when viewed in sagittal planes, characterized in that at least the distal fixation surface (22,28) of the bearing members (12,14) is curvilinear and concave when viewed in sagittal planes.
Claim 3
Dependent Claim
23 words
The femoral component (10) of claim 1 wherein the anterior (20,26) and posterior (24,30) fixation surfaces of the bearing members (12,14) are planar.
Claim 4
Dependent Claim
99 words
A cutting jig (48) for use in the preparation of the distal end (25) of a femur prior to implantation of a femoral prosthesis, which comprises a pair of rail members (52,54) each having a convex curvilinear edge (56,58) thereon; means (60,62) for retaining the rail members (52,54) in fixed spaced relationship; and means (68,70) on the rail rembers (52,54) for temporarily securing the jig (48) to the distal end (25) of the femur, the curvilinear edges (56,58) of the rail members (52,54) being coincident when the jig (48) is secured to the femur and viewed in sagittal planes.
Claim 5
Dependent Claim
99 words
A cutting jig (48) for use in the preparation of the distal end (25) of a femur prior to implantation of a femoral prosthesis, which comprises a pair of rail members (52,54) each having a convex curvilinear edge (56,58) thereon; means (60,62) for retaining the rail members (52,54) in fixed spaced relationship; and means (68,70) on the rail rembers (52,54) for temporarily securing the jig (48) to the distal end (25) of the femur, the curvilinear edges (56,58) of the rail members (52,54) being coincident when the jig (48) is secured to the femur and viewed in sagittal planes.
Claim 6
Dependent Claim
18 words
The cutting jig (48) of claim 3 including means (72) for positioning the jig (48) on the femur.
Claim 7
Dependent Claim
30 words
The cutting jig (48) of claim 3 wherein the curvilinear edges (56,58) are in the form of a circular arc with an angle of rotation of at least about 45°.
Claim 8
Dependent Claim
51 words
A saw blade (98) for use with the cutting jig (48) of claim 3, the blade (98) having a cutting edge (100) with spaced cutting teeth (102) along at least a portion of its length, and a curvilinear cross section congruent with the curvilinear edges (56,58) of the cutting jig (48).
Claim 9
Independent Claim
83 words
A method of preparing the distal end (25) of a femur prior to implantation of a femoral prosthesis, which comprises the steps of securing a cutting jig (48) having a pair of convex curvilinear cutting edges (56,58) thereon to the distal end (25) of the femur after proper alignment therewith; making a transverse distal femoral cut in a surface defined by the curvilinear edges (56,58); removing the cutting jig (48); and making the remaining cuts on the distal end (25) of the femur.
Claim 10
Independent Claim
83 words
A method of preparing the distal end (25) of a femur prior to implantation of a femoral prosthesis, which comprises the steps of securing a cutting jig (48) having a pair of convex curvilinear cutting edges (56,58) thereon to the distal end (25) of the femur after proper alignment therewith; making a transverse distal femoral cut in a surface defined by the curvilinear edges (56,58); removing the cutting jig (48); and making the remaining cuts on the distal end (25) of the femur.
References Cited (Backward Citations)
No citation records indexed.
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