IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0165582
(2008-06-30)
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등록번호 |
US-8206451
(2012-06-26)
|
발명자
/ 주소 |
- Wyss, Joseph G.
- Bennett, Travis D.
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
19 인용 특허 :
238 |
초록
▼
A posterior stabilized knee orthopaedic prosthesis includes a tibial bearing and a femoral component configured to articulate with the tibial bearing. The tibial bearing includes a spine having a concave cam surface and a convex cam surface. The femoral component includes a posterior cam having a co
A posterior stabilized knee orthopaedic prosthesis includes a tibial bearing and a femoral component configured to articulate with the tibial bearing. The tibial bearing includes a spine having a concave cam surface and a convex cam surface. The femoral component includes a posterior cam having a concave cam surface and a convex cam surface. During flexion, the concave cam surface of the posterior cam contacts the convex cam surface of the spine and the convex cam surface of the posterior cam contacts the concave cam surface of the spine.
대표청구항
▼
1. An orthopaedic knee prosthesis comprising: a tibial bearing configured to be coupled to a tibial tray, the tibial bearing having (i) a platform including a medial bearing surface and a lateral bearing surface and (ii) a spine extending upwardly from the platform between the medial bearing surface
1. An orthopaedic knee prosthesis comprising: a tibial bearing configured to be coupled to a tibial tray, the tibial bearing having (i) a platform including a medial bearing surface and a lateral bearing surface and (ii) a spine extending upwardly from the platform between the medial bearing surface and the lateral bearing surface, the spine having a posterior side including a concave cam surface and a convex cam surface, the concave cam surface being concavely curved in the sagittal plane and the convex cam surface being convexly curved in the sagittal plane; anda femoral component configured to articulate with the tibial bearing, the femoral component including (i) a pair of spaced apart condyles defining an intracondylar notch therebetween and (ii) a posterior cam positioned in the intracondylar notch defined between the spaced apart condyles, the posterior cam including a concave cam surface and a convex cam surface that are positioned toward a posterior side of the femoral component, the concave cam surface being concavely curved in the sagittal plane and concavely curved in the medial-lateral direction and the convex cam surface being is convexly curved in the sagittal plane and concavely curved in the medial-lateral direction,wherein the concave cam surface of the posterior cam initially contacts the convex cam surface of the spine during a first range of flexion and the convex cam surface of the posterior cam initially contacts the concave cam surface of the spine during a second range of flexion that is different from the first range of flexion. 2. The orthopaedic prosthesis of claim 1, wherein the concave cam surface and the convex cam surface of the spine are convexly curved in the transverse plane. 3. The orthopaedic prosthesis of claim 2, wherein the radius of curvature in the transverse plane of the concave cam surface of the spine is substantially equal to the radius of curvature in the transverse plane of the convex cam surface of the spine. 4. The orthopaedic prosthesis of claim 1, wherein the spine of the tibial bearing and the posterior cam of the femoral component each have a substantially “S”-shaped cross-sectional profile. 5. The orthopaedic prosthesis of claim 1, wherein the convex cam surface of the spine of the tibial bearing is located superiorly relative to the concave cam surface of the spine. 6. The orthopaedic prosthesis of claim 1, wherein the degrees of flexion of the first range of flexion are less than the degrees of flexion of the second range of flexion. 7. The orthopaedic prosthesis of claim 1, wherein the first range of flexion is about 50 degrees of flexion to about 80 degrees of flexion and the second range of flexion is about 80 degrees of flexion to about 150 degrees of flexion. 8. The orthopaedic prosthesis of claim 1, wherein the concave cam surface of the spine of the tibial bearing is defined by a first radius of curvature and the convex cam surface of the spine is defined by a second radius of curvature, the first radius of curvature being different from the second radius of curvature. 9. The orthopaedic prosthesis of claim 8, wherein the concave cam surface of the posterior cam of the femoral component is defined by a first radius of curvature and the convex cam surface of the posterior cam of the femoral component is defined by a second radius, the first radius of curvature being different from the second radius of curvature. 10. An orthopaedic knee prosthesis comprising: a tibial bearing configured to be coupled to a tibial tray, the tibial bearing having (i) a platform including a medial bearing surface and a lateral bearing surface, and (ii) a spine extending upwardly from the platform between the medial bearing surface and the lateral bearing surface, the spine including a posterior cam surface having a substantially “S”-shaped cross-section in the sagittal plane, the posterior cam surface including a concave cam surface and a convex cam surface, the concave cam surface being concavely curved in the sagittal plane and the convex cam surface being convexly curved in the sagittal plane; anda femoral component configured to be coupled to a surgically-prepared surface of the distal end of a femur, the femoral component including (i) a pair of spaced apart condyles defining an intracondylar notch therebetween, and (ii) a posterior cam positioned in the intracondylar notch defined between the spaced apart condyles, the posterior cam including a cam surface having a substantially “S”-shaped cross-section in the sagittal plane, the cam surface being positioned toward a posterior side of the femoral component and including: (i) a concave cam surface that is concavely curved in the sagittal plane and concavely curved in the medial-lateral direction, and(ii) a convex cam surface that is convexly curved in the sagittal plane and concavely curved in the medial-lateral direction,wherein the cam surface of the posterior cam articulates on the posterior cam surface of the spine such that the concave cam surface of the posterior cam initially contacts the convex cam surface of the spine during a first range of flexion and the convex cam surface of the posterior cam initially contacts the concave cam surface of the spine during a second range of flexion different from the first range of flexion. 11. The orthopaedic prosthesis of claim 10, wherein the concave cam surface and the convex cam surface of the posterior cam surface of the tibial bearing are curved in the transverse plane. 12. The orthopaedic prosthesis of claim 10, wherein the posterior cam of the femoral component is configured to rotate about the spine of the tibial bearing in the transverse plane. 13. A posterior stabilized knee orthopaedic prosthesis comprising: a tibial bearing configured to be coupled to a tibial tray, the tibial bearing having (i) a platform including a medial bearing surface and a lateral bearing surface and (ii) a spine extending upwardly from the platform between the medial bearing surface and the lateral bearing surface, the spine including a posterior side having a superior cam surface and an inferior cam surface, wherein (i) the superior cam surface is convexly curved in the sagittal plane, (ii) the inferior cam surface is concavely curved in the sagittal plane, and (iii) the superior cam surface and the inferior cam surface are convexly curved in the transverse plane; anda femoral component configured to be coupled to a surgically-prepared surface of the distal end of a femur, the femoral component including (i) a lateral condyle configured to articulate with the lateral bearing surface of the tibial bearing, (ii) a medial condyle configured to articulate with the medial bearing surface, and (iii) a posterior cam positioned in an intracondylar notch defined between the lateral condyle and the medial condyle, the posterior cam including an anterior cam surface and a posterior cam surface that are positioned toward a posterior side of the femoral component, wherein (i) the anterior cam surface is concavely curved in the sagittal plane, (ii) the posterior cam surface is convexly curved in the sagittal plane, and (iii) the anterior cam surface and the posterior cam surface are concavely curved in the medial-lateral direction,wherein the anterior cam surface of the posterior cam initially contacts the superior cam surface of the spine at a first degree of flexion and the posterior cam surface of the posterior cam initially contacts the inferior cam surface of the spine at a second degree of flexion greater than the first degree of flexion.
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