Expandable Fusion Device and Method of Installation Thereof
First Claim
Patent Images
1. An intervertebral implant comprising:
- a first endplate having a first end and a second end, the first endplate comprising an upper side, a lower side, first ramped surfaces proximate the first end, and second ramped surfaces proximate the second end;
a second endplate having a first end and a second end, the second endplate comprising an upper side, a lower side, first ramped surfaces proximate the first end, and second ramped surfaces proximate the second end;
a central ramp having a first end and a second end, the central ramp comprising a expansion portion at the first end and an extension extending from the expansion portion, the expansion portion comprising first ramped surfaces in engagement with the first ramped surfaces of the first endplate and second ramped surfaces in engagement with the second ramped surfaces of the second endplate; and
a driving ramp comprising a bore extending through the driving ramp, the driving ramp comprising ramped surfaces in engagement with the first ramped surfaces of the second endplate;
wherein the central ramp is configured to move in a first direction and cause the first endplate and the second endplate to move outwardly and away from one another.
1 Assignment
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Abstract
The present invention provides an expandable fusion device capable of being installed inside an intervertebral disc space to maintain normal disc spacing and restore spinal stability, thereby facilitating an intervertebral fusion. In one embodiment, the fusion device includes a central ramp, a first endplate, and a second endplate, the central ramp capable of being moved in a first direction to move the first and second endplates outwardly and into an expanded configuration. The fusion device is capable of being deployed down an endoscopic tube.
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Citations
20 Claims
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1. An intervertebral implant comprising:
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a first endplate having a first end and a second end, the first endplate comprising an upper side, a lower side, first ramped surfaces proximate the first end, and second ramped surfaces proximate the second end; a second endplate having a first end and a second end, the second endplate comprising an upper side, a lower side, first ramped surfaces proximate the first end, and second ramped surfaces proximate the second end; a central ramp having a first end and a second end, the central ramp comprising a expansion portion at the first end and an extension extending from the expansion portion, the expansion portion comprising first ramped surfaces in engagement with the first ramped surfaces of the first endplate and second ramped surfaces in engagement with the second ramped surfaces of the second endplate; and a driving ramp comprising a bore extending through the driving ramp, the driving ramp comprising ramped surfaces in engagement with the first ramped surfaces of the second endplate; wherein the central ramp is configured to move in a first direction and cause the first endplate and the second endplate to move outwardly and away from one another. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An intervertebral implant comprising:
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a first endplate having a first end and a second end, the first endplate comprising an upper side, a lower side, first ramped surfaces extending from the lower side proximate the first end, and second ramped surfaces extending from the lower side proximate the second end; a second endplate having a first end and a second end, the second endplate comprising an upper side, a lower side, first ramped surfaces extending from the lower side proximate the first end, and second ramped surfaces extending from the lower side proximate the second end; a central ramp having a first end and a second end, the central ramp comprising a expansion portion at the first end and an extension extending from the expansion portion, the expansion portion comprising a first side portion and a second side portion, the first and second side portions each comprising overlapping ramped portions in engagement with first ramped surfaces of the first endplate and the second ramped surfaces of the second endplate; a driving ramp comprising a bore extending through the driving ramp, the driving ramp comprising ramped surfaces in engagement with the first ramped surfaces of the second endplate; and an actuator assembly, the actuator assembly comprising a head portion and an extension that extends through the bore of the driving ramp, the extension of the actuator assembly in engagement with the extension of the central ramp; wherein the central ramp is configured to move in a first direction and cause the first endplate and the second endplate to move outwardly and away from one another. - View Dependent Claims (17, 18, 19)
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20. An intervertebral implant comprising:
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a first endplate having a first end and a second end, the first endplate comprising; an upper surface; a lower surface; a first side portion extending from the lower surface and connecting the first end and the second end, the first side portion comprising a first ramped surface proximate the first end, and a second ramped surface proximate the second end; and a second side portion extending from the lower surface and connecting the first end and the second end, the second side portion comprising a first ramped surface proximate the first end, a second ramped surface proximate the second end, and a central ramped surface between the first ramped surface and the second ramped surface; wherein at least a portion of the lower surface of the first endplate between the first and the second side portions is curved concavely; a second endplate having a first end and a second end, the second endplate comprising; an upper surface; a lower surface; a first side portion extending from the lower surface and connecting the first end and the second end, the first side portion comprising a first ramped surface proximate the first end, a second ramped surface proximate the second end, and a central ramped surface between the first ramped surface and the second ramped surface; and a second side portion extending from the lower surface and connecting the first end and the second end, the second side portion comprising a first ramped surface proximate the first end, and a second ramped surface proximate the second end; wherein at least a portion of the lower surface of the second endplate between the first and second side portions is curved concavely, wherein the first end of the first endplate overlaps the second end of the second endplate, wherein the first end of the second endplate overlaps the second end of the first endplate; a central ramp having a first end and a second end, the central ramp comprising; a bore extending through the central ramp; a first expansion portion at the first end of the central ramp, the first expansion portion comprising a first side portion, a second side portion, the first side portion comprising a first ramped surface and a second ramped surface overlapping the first ramped surface, the second side portion comprising a first ramped surface and a second ramped surface overlapping the first ramped surface; an extension, the extension extending from the first expansion portion to the second end of the central ramp; a second expansion portion located on the extension between the first end and the second end of the central ramp, the second expansion portion comprising a first ramped surface and a second ramped surface; a driving ramp the driving ramp comprising; an upper side; a lower side; a first side portion connecting the upper portion and the lower portion, the first side portion comprising a ramped surface; and a second side portion connecting the upper portion and the lower portion, the second side portion comprising a ramped surface; wherein the upper side, lower side, first side portion, and the second side portion form a bore through the driving ramp; and an actuator assembly comprising; a through bore that extends through the actuator assembly; a head portion; an extension in engagement with the extension of the central ramp, the extension extending from the head portion through the bore of the driving ramp; wherein rotation of the actuator assembly in a first direction is configured to move the central ramp in a first linear direction to cause the first endplate and the second endplate to move outwardly and away from one another; wherein the first ramped surface and the second ramped surface in the first side portion of the first expansion portion are respectively engaged with the second ramped surface in the first side portion of the second endplate and the first ramped surface in the first side portion of the first endplate; wherein the first ramped surface and the second ramped surface in the second side portion of the first expansion portion are respectively engaged with the second ramped surface in the second side portion of the second endplate and the first ramped surface in the second side portion of the first endplate; wherein the first ramped surface and the second ramped surface in the second expansion portion are respectively engaged with the central ramped surface in the first side portion of the second endplate and the central ramped surface in the second side portion of the first endplate; wherein the ramped surface in the first side portion of the driving ramp is in engagement with the second ramped surface in the first side portion of the second endplate; and wherein the ramped surface in the second side portion of the driving ramp is in engagement with the second ramped surface in the second side portion of the second endplate.
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Specification