IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0165579
(2008-06-30)
|
등록번호 |
US-8828086
(2014-09-09)
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발명자
/ 주소 |
- Williams, John L.
- Gomaa, Said T.
- Armacost, John M.
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
243 |
초록
An orthopaedic knee prosthesis includes a femoral component having a condyle surface. The condyle surface is defined by one or more radii of curvatures, which are controlled to reduce or delay the onset of anterior translation of the femoral component relative to a tibial bearing.
대표청구항
▼
1. An orthopaedic knee prosthesis comprising: a femoral component having a condyle surface 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 surfac
1. An orthopaedic knee prosthesis comprising: a femoral component having a condyle surface 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 equal to about 0 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 10 degrees to 75 degrees, and (iii) 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,wherein (i) the condyle surface has a first radius of curvature in the sagittal plane at the first contact point, a second radius of curvature in the sagittal plane at the second contact point, and a third radius of curvature in the sagittal plane at the third contact point, and (ii) the second radius of curvature is greater than the first radius of curvature by at least 0.5 millimeters, andwherein the third radius of curvature is less than the second radius of curvature such that a curved surface section having a non-constant radius of curvature is defined between the first contact point and the third contact point and is configured to reduce paradoxical anterior translation of the femoral component. 2. The orthopaedic knee prosthesis of claim 1, wherein the second degree of flexion is about 30 degrees. 3. The orthopaedic knee prosthesis of claim 1, wherein the second radius of curvature is greater than the first radius of curvature by a distance of at least 2 millimeters. 4. The orthopaedic knee prosthesis of claim 3, wherein the second radius of curvature is greater than the first radius of curvature by a distance of at least 5 millimeters. 5. The orthopaedic knee prosthesis of claim 1, wherein the ratio of the first radius of curvature to the second radius of curvature is in the range of 0.50 to 0.99. 6. The orthopaedic knee prosthesis of claim 5, wherein the ratio of the first radius of curvature to the second radius of curvature is in the range of 0.90 to 0.99. 7. The orthopaedic knee prosthesis of claim 1, wherein the third degree of flexion is less than about 90 degrees. 8. The orthopaedic knee prosthesis of claim 1, wherein: (i) the condyle surface of the femoral component is a medial condyle surface and the bearing surface of the tibial bearing is a medial bearing surface,(ii) the femoral component further includes a lateral condyle surface curved in the sagittal plane, and(iii) the tibial bearing further includes a lateral bearing surface configured to articulate with the lateral condyle surface of the femoral component. 9. The orthopaedic knee prosthesis of claim 8, wherein the lateral condyle surface and the medial condyle surface are substantially symmetrical in the sagittal plane. 10. The orthopaedic knee prosthesis of claim 8, wherein the lateral condyle surface (i) contacts the lateral bearing surface at a first point on the lateral condyle surface at a fourth degree of flexion, the fourth degree of flexion being less than about 30 degrees, and (ii) contacts the lateral bearing surface at a second point on the lateral condyle surface at a fifth degree of flexion, the fifth degree of flexion being greater than the fifth degree of flexion, andwherein (i) the lateral condyle surface has a first radius of curvature in the sagittal plane at the first contact point, (ii) the lateral condyle surface has a second radius of curvature in the sagittal plane at the second contact point, and (iii) the second radius of curvature is greater than the first radius of curvature by at least 0.5 millimeters. 11. The orthopaedic knee prosthesis of claim 10, wherein the second radius of curvature of the lateral condyle is different from the second radius of curvature of the medial condyle. 12. The orthopaedic knee prosthesis of claim 10, wherein the second degree of flexion is different from the fifth degree of flexion. 13. The orthopaedic knee prosthesis of claim 10, wherein the difference between the first radius of curvature and the second radius of curvature is different from the difference between the third radius of curvature and the fourth radius of curvature. 14. An orthopaedic knee prosthesis comprising: a femoral component having a condyle surface 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 30 degrees, and (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 greater than about 30 degrees, and (iii) 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,wherein (i) the condyle surface has a first radius of curvature in the sagittal plane at the first contact point, (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 0.80 to 0.99, andwherein the condyle surface has a third radius of curvature in the sagittal plane at the third contact point, the third radius of curvature being less than the second radius of curvature such that a curved surface section having a non-constant radius of curvature is defined between the first contact point and the third contact point and is configured to reduce paradoxical anterior translation of the femoral component. 15. The orthopaedic knee prosthesis of claim 14, wherein the ratio of the first radius of curvature to the second radius of curvature is from 0.90 to 0.99.
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