IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0165574
(2008-06-30)
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등록번호 |
US-8192498
(2012-06-05)
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발명자
/ 주소 |
- Wagner, Christel M.
- Sokolov, Dimitri
- Lee, Jordan S.
- Williams, John L.
- Gomaa, Said T.
- Armacost, John M.
|
출원인 / 주소 |
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
61 인용 특허 :
238 |
초록
▼
An orthopaedic knee prosthesis includes a tibial bearing and a femoral component configured to articulate with the tibial bearing. The femoral component includes a condyle surface curved in the sagittal plane. The radius of curvature of the condyle surface decreases gradually between early-flexion a
An orthopaedic knee prosthesis includes a tibial bearing and a femoral component configured to articulate with the tibial bearing. The femoral component includes a condyle surface curved in the sagittal plane. The radius of curvature of the condyle surface decreases gradually between early-flexion and mid-flexion. Additionally, in some embodiments, the radius of curvature may be increased during mid-flexion.
대표청구항
▼
1. An orthopaedic knee prosthesis comprising: a femoral component having a condyle surface that is curved in the sagittal plane; anda tibial bearing having a bearing surface configured to articulate with the condyle surface of the femoral component,wherein the condyle surface (i) contacts the bearin
1. An orthopaedic knee prosthesis comprising: a femoral component having a condyle surface that is curved in the sagittal plane; anda tibial bearing having a bearing surface configured to articulate with the condyle surface of the femoral component,wherein the condyle surface (i) contacts the bearing surface at a first contact point on the condyle surface at a first degree of flexion, the first degree of flexion being less than about 30 degrees, (ii) contacts the bearing surface at a second contact point on the condyle surface at a second degree of flexion, the second degree of flexion being in the range of 45 degrees to 90 degrees, and (iii) contacts the bearing surface at a plurality of contact points between the first contact point and the second contact point when the femoral component is moved from the first degree of flexion to the second degree of flexion, each contact point of the plurality of contact points being defined by a ray extending from a common origin to the respective contact point of the plurality of contact points, each ray having a length different from every other ray such that a curved surface section having a non-constant radius of curvature is defined between the first contact point and the second contact point,wherein (i) the condyle surface has a first radius of curvature in the sagittal plane at the first contact point, the first radius of curvature having an origin, (ii) the condyle surface has a second radius of curvature in the sagittal plane at the second contact point, and (iii) the ratio of the first radius of curvature to the second radius of curvature is in the range of 1.10 to 1.45, and (iv) the distance between the origin of the first radius of curvature and the common origin of the rays is in the range of 0 and 10 millimeters. 2. The orthopaedic knee prosthesis of claim 1, wherein ratio of the first radius of curvature to the second radius of curvature is about 1.35. 3. The orthopaedic knee prosthesis of claim 1, wherein the first degree of flexion is in the range of 0 degrees to 10 degrees and the second degree of flexion is in the range of 60 degrees to 70 degrees. 4. The orthopaedic knee prosthesis of claim 3, wherein the first degree of flexion is about 5 degrees and the second degree of flexion is about 65 degrees. 5. The orthopaedic knee prosthesis of claim 1, wherein: (i) the condyle surface contacts the bearing surface at a third contact point on the condyle surface at a third degree of flexion, the third degree of flexion being greater than the second degree of flexion, and(ii) the condyle surface has a third radius of curvature in the sagittal plane at the third contact point, the third radius of curvature being greater than the second radius of curvature by at least 0.5 millimeters. 6. The orthopaedic knee prosthesis of claim 5, wherein the ratio of the first radius of curvature to the third radius of curvature is in the range of 1.10 to 1.45. 7. The orthopaedic knee prosthesis of claim 6, wherein the ratio of the first radius of curvature to the third radius of curvature is about 1.28. 8. The orthopaedic knee prosthesis of claim 5, wherein the third degree of flexion is in the range of 80 degrees to 110 degrees. 9. The orthopaedic knee prosthesis of claim 8, wherein the third degree of flexion is about 90 degrees. 10. The orthopaedic knee prosthesis of claim 5, wherein: (i) the condyle surface contacts the bearing surface at a fourth contact point on the condyle surface at a fourth degree of flexion, the fourth degree of flexion being greater than the third degree of flexion, and(ii) the condyle surface has a fourth radius of curvature in the sagittal plane at the fourth contact point, the fourth radius of curvature being less than the third radius of curvature. 11. The orthopaedic knee prosthesis of claim 10, wherein the ratio of the first radius of curvature to the fourth radius of curvature is in the range of 1.10 to 1.45. 12. The orthopaedic knee prosthesis of claim 11, wherein the ratio of the first radius of curvature to the fourth radius of curvature is about 1.305. 13. The orthopaedic knee prosthesis of claim 10, wherein the fourth degree of flexion is in the range of 90 degrees to 120 degrees. 14. The orthopaedic knee prosthesis of claim 13, wherein the third degree of flexion is about 105 degrees. 15. The orthopaedic knee prosthesis of claim 10, wherein the ratio of the first radius of curvature to the second radius of curvature is about 1.35, the ratio of the first radius of curvature to the third radius of curvature is about 1.28, and the ratio of the first radius of curvature to the third radius of curvature is about 1.305. 16. The orthopaedic knee prosthesis of claim 10, wherein: the condyle surface of the femoral component in the sagittal plane includes (i) a second curved surface section defined between the second contact point and the third contact point and (ii) a third curved surface section defined between the third contact point and the fourth contact point,the second curved surface section having a substantially constant radius of curvature in the sagittal plane substantially equal to the third radius of curvature, andthe third curved surface section having a substantially constant radius of curvature in the sagittal plane substantially equal to the fourth radius of curvature. 17. The orthopaedic knee prosthesis of claim 1, wherein: the length of each ray is defined by the following polynomial equation: rθ=(a+(b*θ)+(c*θ2)+(d*θ3)),wherein rθ is the length of the ray defining a contact point at θ degrees of flexion, a is a coefficient value between 20 and 50, and b is a coefficient value in a range selected from the group consisting of: −0.30
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