Expandable spinal implant apparatus and method of use
First Claim
1. An expandable intervertebral spacer, comprising:
- a top component;
a base component in sliding engagement with the top component; and
an expansion mechanism arranged to change a position of the top component with respect to a position of the base component, the expansion mechanism including a height adjuster having a height adjuster port and a height adjuster slot in both the top and base components,wherein the height adjuster slot in the top component includes internal threads and is inwardly tapered from the height adjuster port in the top component toward a side of the top component opposite the height adjuster port,wherein the height adjuster slot in the base component includes internal threads and is inwardly tapered from the height adjuster port in the base component toward a side of the base component opposite the height adjuster port, andwherein the height adjuster port in the base component is a substantially closed circular port.
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0 Petitions
Accused Products
Abstract
A spinal implant apparatus that is an expandable spacer including features to minimize or eliminate spacer cant or offset during and after completing the expansion process. The spacer includes a top component, a base component in engagement with the top component, and an expansion mechanism arranged to change the top component'"'"'s position with respect to the base component. The mechanism for causing expansion may be a screw, a cam, a wedge or other form of distracting device. In one embodiment, the expandable spacer includes a base component with a set of towers and a top component with a set of corresponding silos, where the towers and silos are configured to minimize or eliminate tilt of the top component as it extends upwardly from the base component. In another embodiment, the spacer may include a stepped arrangement around the perimeter of the top component and the base component for engagement during height expansion with minimal canting or slippage. In another embodiment, the spacer may include texturing modification at the opposite ends of the longitudinal axis of the spacer to prevent tilting, slipping, or canting. Additionally, a portion of one or more exterior surfaces of the spacer may be textured, sawtoothed, dovetailed or the like to increase frictional intervertebral contact. The spacer may contain one or more passageways of selectable shape/dimension for bone growth through the spacer.
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Citations
20 Claims
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1. An expandable intervertebral spacer, comprising:
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a top component; a base component in sliding engagement with the top component; and an expansion mechanism arranged to change a position of the top component with respect to a position of the base component, the expansion mechanism including a height adjuster having a height adjuster port and a height adjuster slot in both the top and base components, wherein the height adjuster slot in the top component includes internal threads and is inwardly tapered from the height adjuster port in the top component toward a side of the top component opposite the height adjuster port, wherein the height adjuster slot in the base component includes internal threads and is inwardly tapered from the height adjuster port in the base component toward a side of the base component opposite the height adjuster port, and wherein the height adjuster port in the base component is a substantially closed circular port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An expandable intervertebral spacer, comprising:
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a top component; a base component in sliding engagement with the top component; and an expansion mechanism arranged to change a position of the top component with respect to a position of the base component, the expansion mechanism including a height adjuster having a height adjuster port and a height adjuster slot in both the top and base components, wherein the height adjuster slot in the top component includes internal threads and is inwardly tapered from the height adjuster port in the top component toward a side of the top component opposite the height adjuster port, wherein the height adjuster slot in the base component includes internal threads and is inwardly tapered from the height adjuster port in the base component toward a side of the base component opposite the height adjuster port, wherein the base component includes a receiver configured to receive and removably retain at least a portion of the top component, and wherein the receiver and the top component are substantially rectangular, the top component configured to fit entirely within the receiver. - View Dependent Claims (20)
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Specification