Meniscus prosthetic devices with anti-migration features
First Claim
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1. A prosthetic device for replacing a damaged meniscus of a knee joint, the prosthetic device comprising:
- a central portion having an upper surface for engagement with a portion of a femur and an opposing lower surface for engagement with a portion of a tibia, the central portion formed of a resilient polyurethane;
an outer portion surrounding the central portion and having an increased thickness relative to the central portion, the outer portion comprising a first section having a generally semi-ellipsoidal profile similar to that of a natural meniscus and a second section extending between first and second ends of the first section, the second section sized and shaped to engage a femur notch to secure the meniscus prosthetic device within the knee joint without penetrating bone, the second section having a height greater than the first section, the outer portion formed of the resilient polyurethane embedded with reinforcing fibers such that the outer portion has an increased radial stiffness relative to the central portion;
wherein the resilient polyurethane comprises a polycarbonate polyurethane; and
wherein the embedded fibers comprise an ultra high molecular weight polyethylene.
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Abstract
A prosthetic device for use as an artificial meniscus is disclosed. The prosthetic device restores shock absorption, stability, and function to the knee joint after removal of the damaged natural meniscus. In some embodiments, the prosthetic device includes an anti-migration feature. The anti-migration feature is a bridge for engagement with a femur notch in some instances. Generally, the anti-migration feature allows the artificial meniscus to be implanted into the patient'"'"'s knee and maintain its position within the knee without penetrating the adjacent bone. The bridge is reinforced with fibers in some instances.
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Citations
19 Claims
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1. A prosthetic device for replacing a damaged meniscus of a knee joint, the prosthetic device comprising:
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a central portion having an upper surface for engagement with a portion of a femur and an opposing lower surface for engagement with a portion of a tibia, the central portion formed of a resilient polyurethane; an outer portion surrounding the central portion and having an increased thickness relative to the central portion, the outer portion comprising a first section having a generally semi-ellipsoidal profile similar to that of a natural meniscus and a second section extending between first and second ends of the first section, the second section sized and shaped to engage a femur notch to secure the meniscus prosthetic device within the knee joint without penetrating bone, the second section having a height greater than the first section, the outer portion formed of the resilient polyurethane embedded with reinforcing fibers such that the outer portion has an increased radial stiffness relative to the central portion; wherein the resilient polyurethane comprises a polycarbonate polyurethane; and wherein the embedded fibers comprise an ultra high molecular weight polyethylene. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A meniscus prosthetic device, comprising:
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a central portion having a partially concave upper surface having an upper engagement section sized and shaped for intermittent engagement with a portion of a femur and an opposing partially concave lower surface having a lower engagement section sized and shaped for intermittent engagement with a portion of a tibia, wherein a thickness between the upper engagement section of the upper surface and the lower engagement section of the lower surface is between about 1 mm and about 3 mm; an outer portion surrounding the central portion and having an increased thickness relative to the central portion, the increased thickness of the outer portion being between about 4 mm and about 20 mm such that the outer portion is sized and shaped for continuous engagement with the femur and the tibia, wherein the outer portion is configured to radially expand and contract between an unloaded position and a loaded position during movement of a knee joint such that the upper engagement section of the upper surface of the central portion engages the portion of the femur in the loaded position and is spaced from the portion of the femur in the unloaded position and such that the lower engagement section of the lower surface of the central portion engages the portion of the tibia in the loaded position and is spaced from the portion of the tibia in the unloaded position, the outer portion comprising a first section having a generally semi-ellipsoidal profile similar to that of a natural meniscus and a second section extending between first and second ends of the first section, the second section sized and shaped to engage a femur notch to secure the meniscus prosthetic device within a knee joint without penetrating bone, the second section having an upper-inner surface tapering into the upper surface of the central portion, the upper-inner surface defined by a varying radius of curvature along a length of the second section. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification