Patent US3941516A successfully refreshed from Google Patents.
Patent EP0714645A1 successfully refreshed from Google Patents.
EP0714645A1
Expired / Lapsed
EP
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Modular knee prosthesis
Assignee: Johnson and Johnson Professional Inc
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Filing: 1995-11-30
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Granted: —
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Expires: 2015-11-30
Abstract
Abstract A modular knee prosthesis includes a femoral component having a pair of spaced apart condylar portions each having a superior articulating surface and an inferior surface, and a boss structure disposed between and connecting the condylar portions. The prosthesis further includes an elongate stem member that mounts within the medullary canal of a distal portion of a femur, a collar and at least one securing bolt. The collar mounts upon the external end of the stem member, and has a distal surface that is substantially transverse to a longitudinal axis of the stem member when mounted thereon. The collar distal surface and the inferior surface of the boss structure define a selected mounting angle therebetween, and the securing bolt, which is adapted to mount within an aperture formed in the boss structure, has a head portion with a spherical first surface from which an elongate shaft portion extends. The shaft of the securing bolt can be disposed at a generally centrally located position or at a non-centrally located position on the head portion of the bolt.
Inventors
- 👤 Stefan M. Gabriel
- 👤 David G. Sheehan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 21:11
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3859; A61F2002/30001; A61F2002/30316; A61F2002/30329; A61F2002/30476; A61F2002/30495; A61F2220/00; A61F2220/0025
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
201 words
A modular knee prosthesis comprising a femoral component having a pair of spaced apart condylar portions each having a superior, articulation surface and an inferior surface, the femoral component further including a boss structure disposed between and connecting the condylar portions, the boss structure having an inferior surface that extends, in a first orientation, generally horizontally in a transverse plane, and an opposed superior surface, wherein an aperture having a selected configuration extends between the inferior and superior surfaces of the boss structure; an elongate stem member means for mounting within the medullary canal of a distal portion of a femur, the stem member having a closed proximal end and an open distal end; a collar means for mounting upon the external end of the stem member, the collar means having a distal surface that is substantially transverse to a longitudinal axis of the stem member when mounted thereon, the collar distal surface and the inferior surface of the boss structure defining a selected mounting angle therebetween; and at least one securing bolt for mounting within the aperture of the boss structure, the securing bolt having a head portion with a spherical first surface from which an elongate shaft portion extends.
Claim 2
Dependent Claim
28 words
The knee prothesis of claim 1 wherein the shaft portion of the bolt is disposed at and extends from a generally centrally located position on the head portion.
Claim 3
Dependent Claim
27 words
The knee prosthesis of claim 1 wherein the shaft portion of the bolt is disposed at and extends from a non-centrally located position on the head portion.
Claim 4
Dependent Claim
40 words
The knee prosthesis of claim 3 wherein the elongate shaft portion is offset a selected distance, preferably 0.1 mm to 5 mm, in the transverse plane, in an anterior-posterior direction from a centrally located position on the bolt head portion.
Claim 5
Dependent Claim
34 words
The knee prosthesis of any one of claims 1 to 4 wherein the distal end of the elongate stem member includes a receiving means for receiving and engaging the shaft portion of the bolt.
Claim 6
Dependent Claim
44 words
The knee prosthesis of claim 5 wherein the receiving means includes a cavity, at least a portion of which is threaded and preferably at least a portion of the bolt shaft is threaded so as to matingly engage a threaded portion of the cavity.
Claim 7
Dependent Claim
63 words
The knee prosthesis of any one of claims 1 to 6 wherein the securing bolt is mountable within the collar means such that the spherical first surface of the head portion engages the aperture of the boss, wherein the mounting angle of the collar means determines the angle at which the bolt shaft portion extends from the inferior surface of the boss structure.
Claim 8
Dependent Claim
63 words
The knee prosthesis of any one of claims 1 to 7 wherein the mounting angle of the distal end of the collar means is in the range of 0 degrees to 15 degrees either in the medial-lateral direction in the transverse plane, to the medial or lateral side or in the anterior-posterior direction in the transverse plane, to the anterior or posterior side.
Claim 9
Dependent Claim
35 words
The knee prosthesis of any one of claims 1 to 8 wherein the head portion of the bolt includes a first anti-rotation means for preventing rotation of the bolt when mounted within the boss aperture.
Claim 10
Dependent Claim
51 words
The knee prosthesis of claim 9 wherein the boss structure further includes a second anti-rotation means, which engages the first anti-rotation means of the bolt, for preventing rotation of the bolt when mounted within the boss aperture, the second anti-rotation means being formed on the superior surface of the boss structure.
Claim 11
Dependent Claim
35 words
The knee prosthesis of any one of claims 1 to 10 wherein the collar includes a third anti-rotation means for preventing rotation of the collar when mounted on the inferior surface of the boss structure.
Claim 12
Dependent Claim
54 words
The knee prosthesis of claim 11 wherein the inferior surface of the boss structure includes a fourth anti-rotation means, which engages the third anti-rotation means of the collar, for preventing rotation of the collar when mounted on the boss structure, the fourth anti-rotation means being formed on the inferior surface of the boss structure.
Claim 13
Dependent Claim
47 words
The knee prosthesis of any one of claims 1 to 12 wherein the aperture formed within the inferior surface of the boss structure has a selected elliptical shape that is elongated in at least one of an anterior-posterior direction and a medial-lateral direction in the transverse plane.
Claim 14
Dependent Claim
45 words
The knee prosthesis of any one of claims 1 to 13 further comprising locking means, preferably comprising a snap-ring, for securing the collar means to the elongated stem member, the locking means being disposed in an interference fit with the collar means and the stem.
Claim 15
Dependent Claim
27 words
The knee prosthesis of any one of claims 1 to 14 wherein the elongate stem member is rotatable about its longitudinal axis independent of the collar means.
Claim 16
Dependent Claim
35 words
The knee prosthesis of any one of claims 1 to 15 wherein the collar means, the elongate stem member and/or the securing bolt are suitable for use, without modification, in right or left side prostheses.
References Cited (Backward Citations)
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