IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0165575
(2008-06-30)
|
등록번호 |
US-8187335
(2012-05-29)
|
발명자
/ 주소 |
- Wyss, Joseph G.
- Sokolov, Dimitri
- Lee, Jordan S.
- Williams, John L.
- Gomaa, Said T.
- Armacost, John M.
- Wagner, Christel M.
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
15 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 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, (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 the first degree of flexion and in the range of about 0 degrees to about 50 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 and less than about 90 degrees,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 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 0.5 millimeters, andwherein the posterior cam of the femoral component initially contacts the spine of the tibial bearing after the second degree of flexion 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. 2. The posterior stabilized orthopaedic knee prosthesis of claim 1, wherein the second degree of flexion is no greater than about 30 degrees. 3. The posterior stabilized orthopaedic knee prosthesis of claim 1, wherein the third degree of flexion is at least 30 degrees. 4. The posterior stabilized orthopaedic knee prosthesis of claim 3, wherein the third degree of flexion is at least 50 degrees. 5. The posterior stabilized orthopaedic knee prosthesis of claim 4, wherein the third degree of flexion is at least 70 degrees. 6. The posterior stabilized orthopaedic knee prosthesis of claim 1, wherein the fourth degree of flexion is no greater than the third degree of flexion. 7. The posterior stabilized orthopaedic knee prosthesis of claim 1, wherein the fourth degree of flexion is at least 70 degrees. 8. The posterior stabilized orthopaedic knee prosthesis of claim 1, wherein the third radius of curvature is greater than the second radius of curvature by at least 2 millimeters. 9. The posterior stabilized orthopaedic knee prosthesis of claim 8, wherein the third radius of curvature is greater than the second radius of curvature by at least 5 millimeters. 10. The posterior stabilized orthopaedic knee prosthesis of claim 1, wherein the ratio of the second radius of curvature to the third radius of curvature is in the range of 0.75 to 0.85. 11. The posterior stabilized orthopaedic knee prosthesis of claim 1, wherein the second degree of flexion is about 50 degrees, the third degree of flexion is about 70 degrees, the fourth degree of flexion is substantially equal to the third degree of flexion, and the third radius of curvature is greater than the second radius of curvature by at least 5 millimeters. 12. The posterior stabilized orthopaedic knee prosthesis of claim 1, wherein: the condyle surface of the femoral component includes (i) a first curved surface section defined between the first contact point and the second contact point and (ii) a second curved surface section defined between the second contact point and the third contact point,the first curved surface section having a substantially constant radius of curvature in the sagittal plane substantially equal to the second radius of curvature, andthe second curved surface section having a substantially constant radius of curvature in the sagittal plane substantially equal to the third radius of curvature. 13. 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 between 20 and 50, and b is a coefficient value in a range selected from the group consisting of: −0.30
※ AI-Helper는 부적절한 답변을 할 수 있습니다.