Vertically expanding intervertebral body fusion device
First Claim
1. An intervertebral spacer for implantation between opposing endplates of adjacent vertebrae, said spacer comprising a body formed from a biodegradable shape memory polymeric material and having an upper first surface, an opposite second surface and a peripheral sidewall extending therebetween, said body provided in a first configuration and capable of deforming under selected stimuli to an expanded second configuration, wherein the upper surface is provided to bear against a first end plate of a first vertebra while the lower surface is provided to bear against a opposing endplate of an adjacent vertebra.
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Abstract
This invention relates to intervertebral spacers for use in orthopedic treatment of spinal defects. The intervertebral space is formed of a shaped memory polymer material. The spacer can be fabricated into a desired configuration and then deformed into an alternative or deformed configuration. Cooling the deformed spacer effectively freezes the spacer into its deformed conformation. The deformed configuration can be selected to facilitate implantation of the spacer into a prepared disc space between adjacent vertebrae. During operation, the surgeon can heat the spacer to allow it to revert to its original configuration. The spacer in its original conformation is sized to restore and/or maintain the adjacent vertebrae in a desired conformation and disc space height.
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Citations
39 Claims
- 1. An intervertebral spacer for implantation between opposing endplates of adjacent vertebrae, said spacer comprising a body formed from a biodegradable shape memory polymeric material and having an upper first surface, an opposite second surface and a peripheral sidewall extending therebetween, said body provided in a first configuration and capable of deforming under selected stimuli to an expanded second configuration, wherein the upper surface is provided to bear against a first end plate of a first vertebra while the lower surface is provided to bear against a opposing endplate of an adjacent vertebra.
- 19. An intervertebral spacer for implantation between adjacent vertebrae, said spacer comprising a body comprising a first bearing surface, an opposite second bearing surface, and a peripheral sidewall therebetween and composed of a biodegradable, shape memory polymeric material, said body capable of withstanding a compressive force of at least 500 Newtons without significant deformation when maintained at a temperature below a deformation temperature, yet capable of deforming above the deformation temperature.
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31. A method of orthopedic treatment, said method comprising:
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preparing a disc space between adjacent vertebrae to receive a spacer to receive an intervertebral spacer, implanting an intervertebral spacer in the prepared disc space, said spacer composed of a biodegradable, shape memory polymeric material and provided in a first configuration exhibiting a first external volume, and subjecting said spacer to a selected stimuli wherein said spacer deforms to a second configuration exhibiting a second external volume greater than the first external volume. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39)
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Specification