US6013103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medial pivot knee prosthesis
Assignee: Microport Orthopedics Holdings Inc
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Filing: 1997-11-26
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Granted: 2000-01-11
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Expires: 2017-11-26
Abstract
Abstract A knee prosthesis for replacing at least a portion of a knee joint between the distal end of a femur and the proximal end of a tibia. The knee prosthesis includes a tibial component for mounting to the proximal end of the tibia, the tibial component including a proximal surface having a semispherical medial cavity and a lateral cavity; and a femoral component for mounting to the distal end of the femur, the femoral component including a semispherical medial condylar portion for pivotally coacting with the semispherical medial cavity of the tibial component and including a semispherical lateral condylar portion for movably coacting with the lateral cavity of the tibial component; the semispherical medial condylar portion being substantially congruent with the semispherical medial cavity of the tibial component so that substantially complete surface-to-surface contact between the semispherical medial cavity of the tibial component and the semispherical medial condylar portion of the femoral component is provided throughout the range of flexion of the knee joint.
Inventors
- 👤 Michael E. Kaufman
- 👤 Kevin B. Hayes
- 👤 Dennis J. Buchanan
- 👤 Robert D. Paxson
- 👤 Irina A. Timmerman
- 👤 Stephen E. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:56
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3868; A61F2/3877; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30133; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30362; A61F2002/30369; A61F2002/30535; A61F2002/30604; A61F2002/30616; A61F2002/30667; A61F2002/30708; A61F2/30767; A61F2/30771; A61F2002/30795; A61F2002/308; A61F2002/30802; A61F2002/30878; A61F2002/30884; A61F2/3094; A61F2/30942; A61F2002/30943; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0015; A61F2250/00; A61F2250/0058; A61F2250/0084; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00029
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
272 words
A knee prosthesis for replacing at least a portion of a knee joint between the distal end of a femur and the proximal end of a tibia; the knee prosthesis comprising: (a) a tibial component for mounting to the proximal end of the tibia, said tibial component including a proximal surface having a semispherical medial cavity and a lateral cavity; and (b) a femoral component for mounting to the distal end of the femur, said femoral component including a medial condylar portion having a face surface for pivotally coacting with said semispherical medial cavity of said tibial component and including a lateral condylar portion having a face surface for movably coacting with said lateral cavity of said tibial component; said face surface of said medial condylar portion having a posterior side, a distal side, an anterior side, and a semispherical shape only from a posterior point on said posterior side of said face surface of said medial condylar portion to an anterior point on said anterior side of said face surface of said medial condylar portion located about 130° from said posterior point; said face surface of said lateral condylar portion having a posterior side, a distal side, an anterior side, and a semispherical shape; said semispherical shape of said face surface of said medial condylar portion being substantially congruent with said semispherical medial cavity of said tibial component so that substantially complete surface-to-surface contact between said semispherical medial cavity of said tibial component and said face surface of said medial condylar portion of said femoral component is provided only throughout the range of flexion of about 130° of the knee joint.
Claim 2
Dependent Claim
272 words
A knee prosthesis for replacing at least a portion of a knee joint between the distal end of a femur and the proximal end of a tibia; the knee prosthesis comprising: (a) a tibial component for mounting to the proximal end of the tibia, said tibial component including a proximal surface having a semispherical medial cavity and a lateral cavity; and (b) a femoral component for mounting to the distal end of the femur, said femoral component including a medial condylar portion having a face surface for pivotally coacting with said semispherical medial cavity of said tibial component and including a lateral condylar portion having a face surface for movably coacting with said lateral cavity of said tibial component; said face surface of said medial condylar portion having a posterior side, a distal side, an anterior side, and a semispherical shape only from a posterior point on said posterior side of said face surface of said medial condylar portion to an anterior point on said anterior side of said face surface of said medial condylar portion located about 130° from said posterior point; said face surface of said lateral condylar portion having a posterior side, a distal side, an anterior side, and a semispherical shape; said semispherical shape of said face surface of said medial condylar portion being substantially congruent with said semispherical medial cavity of said tibial component so that substantially complete surface-to-surface contact between said semispherical medial cavity of said tibial component and said face surface of said medial condylar portion of said femoral component is provided only throughout the range of flexion of about 130° of the knee joint.
Claim 3
Dependent Claim
78 words
The knee prosthesis of claim 1 in which said medial condylar portion of said femoral component includes a face surface having a posterior side, a distal side, an anterior side, and a curvature defined by a single radius of curvature in the sagittal plane from a posterior point on said posterior side of said face surface of said medial condylar portion to an anterior point on said anterior side of said face surface of said medial condylar portion.
Claim 4
Dependent Claim
39 words
The knee prosthesis of claim 1 in which said posterior point on said posterior side of said face surface of said medial condylar portion is on a transverse plane passing through the center of said single radius of curvature.
Claim 5
Dependent Claim
46 words
The knee prosthesis of claim 2 in which said anterior point on said anterior side of said face surface of said medial condylar portion is at least about 130° from said posterior point on said posterior side of said face surface of said medial condylar portion.
Claim 6
Dependent Claim
62 words
The knee prosthesis of claim 1 in which said semispherical shape of said face surface of said lateral condylar portion of said femoral component extends only from a posterior point on said posterior side of said face surface of said lateral condylar portion at least to a distal point on said distal side of said face surface of said lateral condylar portion.
Claim 7
Dependent Claim
39 words
The knee prosthesis of claim 5 in which said posterior point on said posterior side of said face surface of said lateral condylar portion is on a transverse plane passing through the center of said single radius of curvature.
Claim 8
Dependent Claim
47 words
The knee prosthesis of claim 5 in which said distal point on said distal side of said face surface of said lateral condylar portion is at least only about 90° from said posterior point on said posterior side of said face surface of said lateral condylar portion.
Claim 9
Dependent Claim
196 words
A knee prosthesis for replacing at least a portion of a knee joint between the distal end of a femur and the proximal end of a tibia; the knee prosthesis comprising: (a) a tibial component for mounting to the proximal end of the tibia, said tibial component including a proximal surface having a semispherical medial cavity and a lateral cavity; and (b) a femoral component for mounting to the distal end of the femur, said femoral component including a medial condylar portion having a face surface for pivotally coacting with said semispherical medial cavity of said tibial component and including a lateral condylar portion having a face surface for movably coacting with said lateral cavity of said tibial component; said face surface of said medial condylar portion having a spherical shape only from about 40° anterior to about 90° posterior and being substantially congruent with said semispherical medial cavity of said tibial component so that substantially complete surface-to-surface contact between said semispherical medial cavity of said tibial component and said face surface of said medial condylar portion of said femoral component is provided only throughout the range of flexion of about 130° of the knee joint.
Claim 10
Dependent Claim
196 words
A knee prosthesis for replacing at least a portion of a knee joint between the distal end of a femur and the proximal end of a tibia; the knee prosthesis comprising: (a) a tibial component for mounting to the proximal end of the tibia, said tibial component including a proximal surface having a semispherical medial cavity and a lateral cavity; and (b) a femoral component for mounting to the distal end of the femur, said femoral component including a medial condylar portion having a face surface for pivotally coacting with said semispherical medial cavity of said tibial component and including a lateral condylar portion having a face surface for movably coacting with said lateral cavity of said tibial component; said face surface of said medial condylar portion having a spherical shape only from about 40° anterior to about 90° posterior and being substantially congruent with said semispherical medial cavity of said tibial component so that substantially complete surface-to-surface contact between said semispherical medial cavity of said tibial component and said face surface of said medial condylar portion of said femoral component is provided only throughout the range of flexion of about 130° of the knee joint.
Claim 11
Dependent Claim
202 words
A knee prosthesis for replacing at least a portion of a knee joint between the distal end of a femur and the proximal end of a tibia; the knee prosthesis comprising: (a) a tibial component for mounting to the proximal end of the tibia, said tibial component including a proximal surface having a semispherical medial cavity and a lateral cavity; and (b) a femoral component for mounting to the distal end of the femur, said femoral component including a medial condylar portion having a semispherical face surface for pivotally coacting with said semispherical medial cavity of said tibial component and including a lateral condylar portion having a face surface for movably coacting with said lateral cavity of said tibial component; said face surface of said lateral condylar portion having a spherical shape only from about 0° distal to about 90° posterior; said semi spherical face surface of said medial condylar portion being substantially congruent with said semispherical medial cavity of said tibial component so that substantially complete surface-to-surface contact between said semispherical medial cavity of said tibial component and said face surface of said medial condylar portion of said femoral component is provided throughout the range of flexion of the knee joint.
Claim 12
Dependent Claim
202 words
A knee prosthesis for replacing at least a portion of a knee joint between the distal end of a femur and the proximal end of a tibia; the knee prosthesis comprising: (a) a tibial component for mounting to the proximal end of the tibia, said tibial component including a proximal surface having a semispherical medial cavity and a lateral cavity; and (b) a femoral component for mounting to the distal end of the femur, said femoral component including a medial condylar portion having a semispherical face surface for pivotally coacting with said semispherical medial cavity of said tibial component and including a lateral condylar portion having a face surface for movably coacting with said lateral cavity of said tibial component; said face surface of said lateral condylar portion having a spherical shape only from about 0° distal to about 90° posterior; said semi spherical face surface of said medial condylar portion being substantially congruent with said semispherical medial cavity of said tibial component so that substantially complete surface-to-surface contact between said semispherical medial cavity of said tibial component and said face surface of said medial condylar portion of said femoral component is provided throughout the range of flexion of the knee joint.
Claim 13
Dependent Claim
43 words
The knee prosthesis of claim 1 in which the center of said semispherical medial cavity of said proximal surface of said tibial component is centered about a point located generally over the posterior one third of said proximal surface of said tibial component.
Claim 14
Dependent Claim
83 words
The knee prosthesis of claim 1 in which said femoral component has a patellar flange portion joining the anterior ends of said medial and lateral condylar portions together with said medial and lateral condylar portions substantially parallel to and spaced apart from one another to form an intercondylar notch therebetween; in which said patellar flange portion has a patellar groove in the posterior or face surface thereof extending to the intercondylar notch to enable contact with a patellar component to 100° of flexion.
Claim 15
Dependent Claim
358 words
A knee prosthesis for replacing at least a portion of a knee joint between the distal end of a femur and the proximal end of a tibia; the knee prosthesis comprising: (a) a tibial component for mounting to the proximal end of the tibia, said tibial component including a proximal surface having a semispherical medial cavity and a lateral cavity; the center of said semispherical medial cavity of said proximal surface of said tibial component being centered about a point located generally over the posterior one third of said proximal surface of said tibial component; and (b) a femoral component for mounting to the distal end of the femur, said femoral component including a medial condylar portion having a face surface for pivotally coacting with said semispherical medial cavity of said tibial component and including a lateral condylar portion having a face surface for movably coacting with said lateral cavity of said tibial component; said face surface of said medial condylar portion of said femoral component having a posterior side, a distal side, an anterior side, and a semispherical shape that extends only from a posterior point on said posterior side of said face surface of said medial condylar portion to an anterior point on said anterior side of said face surface of said medial condylar portion located about 130° from said anterior point; said semispherical shape of said face surface of said medial condylar portion being substantially congruent with said semispherical medial cavity of said tibial component so that substantially complete surface-to-surface contact between said semispherical medial cavity of said tibial component and said semispherical medial condylar portion of said femoral component is provided only throughout the range of flexion of about 130° of the knee joint; said face surface of said lateral condylar portion of said femoral component having a posterior side, a distal side, an anterior side, and a semispherical shape that extends only from a posterior point on said posterior side of said face surface of said lateral condylar portion to a distal point on said distal side of said face surface of said lateral condylar portion located about 90° from said posterior point.
Claim 16
Dependent Claim
358 words
A knee prosthesis for replacing at least a portion of a knee joint between the distal end of a femur and the proximal end of a tibia; the knee prosthesis comprising: (a) a tibial component for mounting to the proximal end of the tibia, said tibial component including a proximal surface having a semispherical medial cavity and a lateral cavity; the center of said semispherical medial cavity of said proximal surface of said tibial component being centered about a point located generally over the posterior one third of said proximal surface of said tibial component; and (b) a femoral component for mounting to the distal end of the femur, said femoral component including a medial condylar portion having a face surface for pivotally coacting with said semispherical medial cavity of said tibial component and including a lateral condylar portion having a face surface for movably coacting with said lateral cavity of said tibial component; said face surface of said medial condylar portion of said femoral component having a posterior side, a distal side, an anterior side, and a semispherical shape that extends only from a posterior point on said posterior side of said face surface of said medial condylar portion to an anterior point on said anterior side of said face surface of said medial condylar portion located about 130° from said anterior point; said semispherical shape of said face surface of said medial condylar portion being substantially congruent with said semispherical medial cavity of said tibial component so that substantially complete surface-to-surface contact between said semispherical medial cavity of said tibial component and said semispherical medial condylar portion of said femoral component is provided only throughout the range of flexion of about 130° of the knee joint; said face surface of said lateral condylar portion of said femoral component having a posterior side, a distal side, an anterior side, and a semispherical shape that extends only from a posterior point on said posterior side of said face surface of said lateral condylar portion to a distal point on said distal side of said face surface of said lateral condylar portion located about 90° from said posterior point.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-01-10 | 2003-07-12 | 2004-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-01-10 | 2007-07-12 | 2008-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-01-10 | 2011-07-12 | 2012-01-11 | $7700.00 | Window Closed / Lapsed |