Bone cement having chemically joined reinforcing fillers
First Claim
1. An orthopaedic composition, comprising:
- an amount of a physiologically acceptable polymeric matrix material; and
a quantity of fibers disbursed in said matrix for enhancing functional qualities of the composition, said fibers having a layer of a sizing material thereover which is chemically joined to the surface of the fibers, said sizing material on the fibers also being chemically joined with the matrix material,said fibers being present in said composition in an effective amount for reinforcing said matrix and having an average length of from about 1 μ
m to about 2 cm,said fibers having a stiffness defined as the product of the tensile elastic modulus of the fibers and the area moment of inertia of the fibers, said stiffness being from about 1.0×
10-13 to 150×
10-13 Nm2.
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Accused Products
Abstract
Improved polymeric orthopaedic compositions are disclosed wherein sized, functional fibers are incorporated into a physiologically acceptable matrix. The compositions of the invention can be fabricated in the form of particulate powders adapted for reinforcment of bone cements, continuous media for such cements, and orthopaedic implant coatings. A complete implant attachment system is also provided, made up of a fiber reinforced implant coating, and a compatible fiber-reinforced cement. In preferred forms, the fibers have a layer of sizing thereover which is chemically joined both to the surface of the fibers and to the surrounding matrix, and the fibers are present at a level of at least about 6 volume percent. If desired, sized radiopaque particles may be incorporated into the compositions of the invention. The fibers are advantageously polymeric in nature and of intermediate stiffness, whereas the matrix fraction is preferably polymethylmethacrylate.
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Citations
83 Claims
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1. An orthopaedic composition, comprising:
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an amount of a physiologically acceptable polymeric matrix material; and a quantity of fibers disbursed in said matrix for enhancing functional qualities of the composition, said fibers having a layer of a sizing material thereover which is chemically joined to the surface of the fibers, said sizing material on the fibers also being chemically joined with the matrix material, said fibers being present in said composition in an effective amount for reinforcing said matrix and having an average length of from about 1 μ
m to about 2 cm,said fibers having a stiffness defined as the product of the tensile elastic modulus of the fibers and the area moment of inertia of the fibers, said stiffness being from about 1.0×
10-13 to 150×
10-13 Nm2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69)
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12. An orthopaedic composition as set forth in claim 12, wherein said stiffness is from about 10×
- 10-13 to 75×
10-13 Nm2.
- 10-13 to 75×
- 38. An orthopaedic composition as set forth in claim 38, wherein said matrix is a substituted or unsubstituted acrylate.
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70. A bone cement comprising:
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a continuous medium comprising a physiologically acceptable polymeric material; and a particulate powder dispersed in said continuous medium, the particles making up said powder including a physiologically acceptable polymeric matrix and reinforcing fibers extending through and at least partially out of the particles, said polymeric material of the continuous medium being chemically joined with said fibers. - View Dependent Claims (71, 72, 73, 74, 75, 76)
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- 77. The bone cement of claim 77, said fibers having a layer of sizing material thereover chemically joined to the surface thereof, said sizing material on the fibers also being chemically joined with said matrix material.
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79. A method of preparing an orthopaedic composition comprising the steps of:
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chemically bonding a layer of a sizing material onto the outer surfaces of a quantity of fibers; and polymerizing a monomeric material in the presence of said sized fibers for chemically joining the sized fibers to the resultant polymerized material in order to enhance the properties of the orthopaedic composition. - View Dependent Claims (80, 81, 82)
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83. An orthopaedic composition, consisting essentially of:
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an amount of a physiologically acceptable polymeric matrix material, said material selected from the group consisting of substituted acrylates and unsubstituted acrylates; and a quantity of fibers disbursed in said matrix for enhancing functional qualities of the composition, said fibers having a layer of a sizing material thereover which is chemically joined to the surface of the fibers, said sizing material of the fibers also being chemically joined with the matrix material, said fibers being present in said composition in an effective amount for reinforcing said matrix and having an average length of from about 1 μ
m to about 2 cm,said fibers having a stiffness defined as the product of the tensile elastic modulus of the fibers and the area moment of inertia of the fibers, said stiffness being from about 1.0×
10-13 to 150×
10-13 Nm2.
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Specification