Composite internal fixators
First Claim
Patent Images
1. An intramedullary (IM) nail comprising:
- a longitudinal axis;
a head portion;
a shaft portion;
a transition region between the head portion and the shaft portion;
at least one aperture for receiving a fastener; and
a plurality of radio-opaque markers including first, second, third and fourth radio-opaque markers, the first, second, third and fourth radio-opaque markers being positioned adjacent to the at least one aperture, the first, second, third, and fourth radio-opaque markers being adapted and configured so that, in use, the first, second, third, and fourth radio-opaque markers are capable of illustrating when an imaging device is properly aligned with the at least one aperture;
wherein the IM nail includes a plurality of layers, each layer of the plurality of layers including a thermoplastic component and a fiber component, each layer of the plurality of layers having a selected fiber angle pattern;
wherein the plurality of layers include at least a first layer, a second layer, and a third layer, the second layer being wrapped about the first layer so that the second layer has a different fiber angle pattern than the first layer, and the third layer is wrapped about the second layer so that the third layer has a different fiber angle pattern than the second layer.
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Abstract
A multi-layer, fiber-reinforced composite orthopedic fixation device having a design selected based on a desired characteristic of the orthopedic fixation device. The design may be selected according to a model of the device, the model defining design constraints, and the design may comprise a pattern of the fiber angle for each layer. The selection of a design may be analyzed using finite element analysis to determine whether the design will comprise the desired characteristic.
191 Citations
20 Claims
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1. An intramedullary (IM) nail comprising:
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a longitudinal axis; a head portion; a shaft portion; a transition region between the head portion and the shaft portion; at least one aperture for receiving a fastener; and a plurality of radio-opaque markers including first, second, third and fourth radio-opaque markers, the first, second, third and fourth radio-opaque markers being positioned adjacent to the at least one aperture, the first, second, third, and fourth radio-opaque markers being adapted and configured so that, in use, the first, second, third, and fourth radio-opaque markers are capable of illustrating when an imaging device is properly aligned with the at least one aperture; wherein the IM nail includes a plurality of layers, each layer of the plurality of layers including a thermoplastic component and a fiber component, each layer of the plurality of layers having a selected fiber angle pattern; wherein the plurality of layers include at least a first layer, a second layer, and a third layer, the second layer being wrapped about the first layer so that the second layer has a different fiber angle pattern than the first layer, and the third layer is wrapped about the second layer so that the third layer has a different fiber angle pattern than the second layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An intramedullary (IM) nail for implantation within an intramedullary canal of a long bone, the IM nail comprising:
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a body portion having a longitudinal axis, the body portion including at least one aperture for receiving a fastener and first, second, third and fourth radio-opaque markers embedded within the body portion of the IM nail, the first, second, third and fourth radio-opaque-markers positioned adjacent to the at least one aperture, the first, second, third, and fourth radio-opaque markers being adapted and configured so that, in use, the first and second radio-opaque markers are capable of being aligned with respect to each other and the third and fourth radio-opaque markers are capable of being aligned with respect to each other when an imaging device is properly aligned with the at least one aperture; wherein the body portion includes a plurality of layers, each layer of the plurality of layers being constructed of a composite material including a thermoplastic component and a fiber component; wherein the plurality of layers include at least a first layer, a second layer, and a third layer, the second layer being wrapped about the first layer such that a longitudinal axis of the fibers of the second layer are oriented at a select angle with respect to the longitudinal axis of the body portion of the IM nail, and the third layer is wrapped about the second layer such that a longitudinal axis of the fibers of the third layer are oriented at a select angle with respect to the longitudinal axis of the body portion of the IM nail; wherein the select angle is one of approximately a five to a forty-five degree angle, or approximately a negative five to forty-five degree angle.
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Specification