Orthopedic device of biocompatible polymer with oriented fiber reinforcement
First Claim
1. An orthopaedic device, for human implantation having improved axial bending and torque bearing properties, said device comprising:
- a curved elongated body having an outer surface and a longitudinal axis, the body comprising a matrix of biocompatible polymeric material defining the shape of the body; and
reinforcing plies embedded within said matrix, said plies being curved in approximate correspondence with the curvature of the device and said plies being formed from fibers, said fibers being continuous and generally parallel to each other within each ply;
wherein a majority of the plies are oriented at a non-zero angle to the longitudinal axis of the curved elongated body.
2 Assignments
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Accused Products
Abstract
Orthopedic device of biocompatible polymer with oriented fiber reinforcement. There is provided a device such as a hip stem which has a longitudinally curved body. The reinforcing fibers are continuous filament fiber plies with parallel orienated fibers in each ply. The plies are curved longitudinally to approximately correspond to the curve of the body. In one embodiment, there are longitudinally oriented fiber plies at or near the surfaces of the device and plies with fibers offset at 5°-40° from the longitudinal axis between the surface layers. The fiber orientation is balanced by providing a ply of negatively angled offset fibers of a similar angle for each positively angled offset ply. The device is made by molding plies preimpregnated with polymer (prepregs) simultaneously, by molding a plurality of prepregs into segments which are then molded together, or by molding a segment and incrementally molding additional layers of prepregs thereto in a series of progressively larger molds.
99 Citations
66 Claims
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1. An orthopaedic device, for human implantation having improved axial bending and torque bearing properties, said device comprising:
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a curved elongated body having an outer surface and a longitudinal axis, the body comprising a matrix of biocompatible polymeric material defining the shape of the body; and reinforcing plies embedded within said matrix, said plies being curved in approximate correspondence with the curvature of the device and said plies being formed from fibers, said fibers being continuous and generally parallel to each other within each ply; wherein a majority of the plies are oriented at a non-zero angle to the longitudinal axis of the curved elongated body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A composite hip joint for human implantation, comprising:
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a) a stem including a distal end, a longitudinal curved body extending from the distal end, said curved body culminating in a neck; b) said composite hip joint having an outer surface and comprising a biocompatible polymer matrix; and c) reinforcing plies stacked one atop the other with the matrix, said plies being formed of continuous fibers generally parallel to each other, each of the plies being curved to substantially correspond to the longitudinal curvature of the body; wherein a majority of the reinforcing plies are oriented at a non-zero angle to a longitudinal axis of the longitudinal curved body of the hip joint stem. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 49, 50, 51, 52, 53, 54, 55)
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23. An orthopaedic device having improved axial, bending and torque bearing properties for human implantation;
- comprising;
a body with a longitudinal curve and a longitudinal axis; a matrix of biocompatible polymeric material defining the shape of the body and having an outer surface; and a plurality of planar reinforcing fiber plies embedded within said matrix, said plies each having a longitudinal axis; wherein the fibers with each ply are continuous and oriented parallel to the longitudinal axis of each ply and a majority of the planar plies are oriented at a non-zero angle to the longitudinal axis of the device. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
- comprising;
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37. A composite hip joint for human implantation comprising a stem with a distal end, a longitudinal curved body with a longitudinal axis, a neck, and an outer surface, the hip joint comprising:
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a longitudinally curved biocompatible polymer matrix; and reinforcing planar plies embedded in the matrix, said plies being formed of continuous fibers generally parallel to each other; wherein a majority of the planar plies are oriented at a non-zero angle to the longitudinal axis. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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56. An orthopedic prosthetic device having improved axial, bending and torque bearing properties, said device comprising:
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an elongated prosthesis body formed of a laminated composite having a longitudinal axis; the laminated composite having an outer surface and being formed of plies, each ply comprising reinforcing fibers imbedded in a matrix of biocompatible polymeric material, the fibers in each ply being generally parallel to each other, the plies being fused together to form said laminate composite; wherein at least a majority of the plies are oriented at a non-zero angle relative to the longitudinal axis of the prosthetic device. - View Dependent Claims (57, 58, 59, 61, 62, 63, 64, 65, 66)
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60. The device of 56 wherein the fibers in consecutive plies are stacked in a sequence (02 /±
- 20/±
30/±
20/±
30)s relative to the longitudinal axis of the device.
- 20/±
Specification