IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0481943
(2012-05-28)
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등록번호 |
US-8834575
(2014-09-16)
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발명자
/ 주소 |
- Wyss, Joseph G.
- Sokolov, Dimitri
- Lee, Jordan S.
- Williams, John L.
- Gomaa, Said T.
- Armacost, John M.
- Wagner, Christel M.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
4 인용 특허 :
243 |
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 posterior cam configured to contact a spine of the tibial bearing and a condyle surface curved in the sagittal plane. The radius of curv
An orthopaedic knee prosthesis includes a tibial bearing and a femoral component configured to articulate with the tibial bearing. The femoral component includes a posterior cam configured to contact a spine of the tibial bearing and 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 of the condyle surface may be increased during mid-flexion.
대표청구항
▼
1. A posterior stabilized orthopaedic knee prosthesis comprising: a femoral component including (i) a pair of spaced apart condyles defining an intracondylar notch therebetween, at least one of the pair of spaced apart condyles having a condyle surface curved in the sagittal plane and (ii) a posteri
1. A posterior stabilized orthopaedic knee prosthesis comprising: a femoral component including (i) a pair of spaced apart condyles defining an intracondylar notch therebetween, at least one of the pair of spaced apart condyles having a condyle surface curved in the sagittal plane and (ii) a posterior cam positioned in the intracondylar notch; anda tibial bearing including (i) a platform having a bearing surface configured to articulate with the condyle surface of the femoral component and (ii) a spine extending upwardly from the platform,wherein the condyle surface of the femoral component (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 35 degrees to 90 degrees, (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, and (iv) 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,wherein the posterior cam of the femoral component contacts the spine of the tibial bearing at a fourth degree of flexion, the fourth degree of flexion being no greater than about 10 degrees more than the third degree of flexion,wherein each contact point of the plurality of contact points is 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 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 is selected from the group consisting of: 4.008, 3.898, 3.722, 3.629, 3.468, 3.288, 3.088, 2.866, 2.623, and 2.356, and b is a coefficient value equal to approximately 0.0166694187, c is a coefficient value equal to approximately 0.00027002378, and d is a coefficient value equal to approximately 0.0000124837. 2. The posterior stabilized orthopaedic knee prosthesis of claim 1, wherein: the condyle surface in the sagittal plane has a first radius of curvature at the first contact point, the first radius of curvature having an origin, andthe 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. 3. The posterior stabilized orthopaedic knee prosthesis of claim 1, wherein the first degree of flexion is in the range of 0 degrees to 10 degrees, the second degree of flexion is in the range of 45 degrees to 55 degrees, and the third degree of flexion is in the range of about 65 degrees to about 75 degrees. 4. The posterior stabilized orthopaedic knee prosthesis of claim 3, wherein the first degree of flexion is about 0 degrees, the second degree of flexion is about 50 degrees, and the third degree of flexion is about 70 degrees. 5. The posterior stabilized orthopaedic knee prosthesis of claim 1, wherein: (i) the condyle surface in the sagittal plane has a first radius of curvature at the first contact point, a second radius of curvature at the second contact point, and a third radius of curvature at the third radius of curvature, and(ii) the third radius of curvature is greater than the second radius of curvature by at least 0.5 millimeters. 6. The posterior stabilized orthopaedic knee prosthesis of claim 5, wherein the third radius of curvature is greater than the first radius of curvature by at least 2 millimeters. 7. The posterior stabilized orthopaedic knee prosthesis of claim 6, wherein the third radius of curvature is greater than the first radius of curvature by at least 5 millimeters. 8. The posterior stabilized orthopaedic knee prosthesis of claim 5, wherein ratio of the first radius of curvature to the third radius of curvature is less than the ratio of the first radius of curvature to the second radius of curvature. 9. The posterior stabilized orthopaedic knee prosthesis of claim 5, wherein ratio of the first radius of curvature to the second radius of curvature is between about 1.10 to about 1.30. 10. The posterior stabilized orthopaedic knee prosthesis of claim 5, wherein ratio of the first radius of curvature to the third radius of curvature is between about 1.001 to about 1.100. 11. The posterior stabilized orthopaedic knee prosthesis of claim 10, wherein ratio of the first radius of curvature to the third radius of curvature is about 1.005. 12. The posterior stabilized orthopaedic knee prosthesis of claim 5, wherein the condyle surface of the femoral component in the sagittal plane includes a curved surface section defined between the second contact point and the third contact point, the curved surface section having a substantially constant radius of curvature substantially equal to the third radius of curvature. 13. The posterior stabilized orthopaedic knee prosthesis of claim 1, wherein the fourth degree of flexion is no greater than the third degree of flexion. 14. An orthopaedic knee prosthesis comprising: a femoral component including a pair of spaced apart condyles defining an intracondylar notch therebetween, at least one of the pair of spaced apart condyles having a condyle surface curved in the sagittal plane; anda tibial bearing including a platform having a bearing surface configured to articulate with the condyle surface of the femoral component,wherein the condyle surface of the femoral component (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 35 degrees to 90 degrees, (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, and (iv) 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,wherein (i) the condyle surface in the sagittal plane has a first radius of curvature at the first contact point, a second radius of curvature at the second contact point, and a third radius of curvature at the third contact point, and (ii) the third radius of curvature is greater than the second radius of curvature by at least 2.0 millimeters,wherein each contact point of the plurality of contact points is 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 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 is selected from the group consisting of: 4.008, 3.898, 3.722, 3.629, 3.468, 3.288, 3.088, 2.866, 2.623, and 2.356, and b is a coefficient value equal to approximately 0.0166694187, c is a coefficient value equal to approximately 0.00027002378, and d is a coefficient value equal to approximately 0.0000124837. 15. The orthopaedic knee prosthesis of claim 14, wherein: the femoral component includes a posterior cam positioned in the intracondylar notch, andthe tibial bearing includes a spine extending upwardly from the platform, the posterior cam of the femoral component contacting the spine of the tibial bearing at a fourth degree of flexion no greater than about 10 degrees more than the third degree of flexion. 16. The orthopaedic knee prosthesis of claim 14, 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. 17. The orthopaedic knee prosthesis of claim 16, wherein the lateral condyle surface is substantially symmetrical to the medial condyle surface. 18. The orthopaedic knee prosthesis of claim 16, wherein wherein the lateral condyle surface of the femoral component (i) contacts the lateral bearing surface at a first contact point on the lateral condyle surface at a fifth degree of flexion, the fifth degree of flexion being less than about 30 degrees, (ii) contacts the lateral bearing surface at a second contact point on the lateral condyle surface at a sixth degree of flexion, the sixth degree of flexion being in the range of 35 degrees to 90 degrees, (iii) contacts the lateral bearing surface at a third contact point on the lateral condyle surface at a seventh degree of flexion, the seventh degree of flexion being greater than the sixth degree of flexion, and (iv) contacts the lateral 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 fifth degree of flexion to the sixth degree of flexion, andwherein (i) the lateral condyle surface in the sagittal plane has a first radius of curvature at the first contact point, a second radius of curvature at the second contact point, and a third radius of curvature at the third contact point, and (ii) the third radius of curvature of the lateral condyle surface is greater than the second radius of curvature of the lateral condyle surface by at least 2.0 millimeters. 19. The orthopaedic knee prosthesis of claim 16, wherein wherein the lateral condyle surface of the femoral component (i) contacts the lateral bearing surface at a first contact point on the lateral condyle surface at a fifth degree of flexion, the fifth degree of flexion being less than about 30 degrees, (ii) contacts the lateral bearing surface at a second contact point on the lateral condyle surface at a sixth degree of flexion, the sixth degree of flexion being in the range of 35 degrees to 90 degrees, (iii) contacts the lateral bearing surface at a third contact point on the lateral condyle surface at a seventh degree of flexion, the seventh degree of flexion being greater than the sixth degree of flexion, and (iv) contacts the lateral 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 fifth degree of flexion to the sixth degree of flexion, andwherein each contact point of the plurality of contact points of the lateral condyle surface is defined by a ray extending from a common origin to the respective contact point of the plurality of contact points, each ray of the lateral condyle surface having a length defined by the following polynomial equation: rθ=(a+(b*θ)+(c*θ2)+(d*θ3)),wherein rθ is the length of the ray of the lateral condyle surface defining a contact point at θ degrees of flexion, a is a coefficient value is selected from the group consisting of: 4.008, 3.898, 3.722, 3.629, 3.468, 3.288, 3.088, 2.866, 2.623, and 2.356, and b is a coefficient value equal to approximately 0.0166694187, c is a coefficient value equal to approximately 0.00027002378, and d is a coefficient value equal to approximately 0.0000124837. 20. The orthopaedic knee prosthesis of claim 16, wherein the fourth degree of flexion is no greater than the third degree of flexion. 21. An orthopaedic knee prosthesis comprising: a femoral component including a pair of spaced apart condyles defining an intracondylar notch therebetween, at least one of the pair of spaced apart condyles having a condyle surface curved in the sagittal planewherein the condyle surface includes: an inferior-most point,a distal surface extending posteriorly from the inferior-most point to a superior-most point, the distal surface defining an arc having a magnitude of about 50 degrees between the inferior-most point of the condyle surface and the superior-most point of the distal surface, anda posterior surface connected to the superior-most point of the distal surface, the posterior surface extending superiorly and posteriorly away from the distal surface,wherein the condyle surface has a first radius of curvature in the sagittal plane at the inferior-most point,a second radius of curvature in the sagittal plane at a first point on the distal surface, anda third radius of curvature in the sagittal plane at a first point on the posterior surface, the third radius of curvature being greater than the second radius of curvature by at least 0.5 millimeters, andwherein the condyle surface further includes a fourth radius of curvature in the sagittal plane at a second point on the posterior surface, the second point being located posterior of the first point on the posterior surface and the fourth radius of curvature being less than the third radius of curvature. 22. The orthopaedic knee prosthesis of claim 21, wherein the femoral component includes a posterior cam positioned in the intracondylar notch toward a posterior side of the femoral component.
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