Expandable fusion device and method of installation thereof
First Claim
Patent Images
1. An intervertebral implant comprising:
- a body portion comprising a first end, a second end, a first side portion connecting the first end and the second end, and a second side portion connecting the first end and the second end, the first end, second end, first side portion and second side portion defining a central opening;
a first endplate comprising an upper side, a lower side, a first ramped portion, a second ramped portion, the first and second ramped portions extending from the lower side into the central opening;
a second endplate comprising an upper side, a lower side, and third and fourth ramped portions, the third and fourth ramped portions extending from the lower side into the central opening; and
a translation member comprising an expansion portion, at least a portion of the translation member is received within the central opening, the expansion portion comprising a first, a second, a third and a fourth angled surface, the first and second angled surfaces engaging the first and second ramped portions of the first endplate, the third and fourth angled surfaces engaging the third and fourth ramped portions of the second endplate;
wherein movement of the translation member in a first direction from the first end of the body portion towards the second end of the body portion causes the first and second endplates to move in a direction away from the body portion and the movement of the translation member from the second end of the body portion to the first end of the body portion in a second direction causes the first and second endplates to move in a direction towards the body portion, and wherein the movement of the translation member in the first direction moves the first and second angled surfaces in the same direction along the first and second ramped portions of the first endplate and the third and fourth angled surfaces along the third and fourth ramped portions of the second endplate wherein the first and second angled surfaces are at a first distance from each other when the first endplate is in an unexpanded position and at a second distance at an expanded position, wherein the first and second distances are equal.
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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 body portion, a first endplate, and a second endplate, the first and second endplates capable of being moved in a direction away from the body portion into an expanded configuration or capable of being moved towards the body portion into an unexpanded configuration. The fusion device is capable of being deployed and installed in both configurations.
476 Citations
20 Claims
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1. An intervertebral implant comprising:
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a body portion comprising a first end, a second end, a first side portion connecting the first end and the second end, and a second side portion connecting the first end and the second end, the first end, second end, first side portion and second side portion defining a central opening; a first endplate comprising an upper side, a lower side, a first ramped portion, a second ramped portion, the first and second ramped portions extending from the lower side into the central opening; a second endplate comprising an upper side, a lower side, and third and fourth ramped portions, the third and fourth ramped portions extending from the lower side into the central opening; and a translation member comprising an expansion portion, at least a portion of the translation member is received within the central opening, the expansion portion comprising a first, a second, a third and a fourth angled surface, the first and second angled surfaces engaging the first and second ramped portions of the first endplate, the third and fourth angled surfaces engaging the third and fourth ramped portions of the second endplate; wherein movement of the translation member in a first direction from the first end of the body portion towards the second end of the body portion causes the first and second endplates to move in a direction away from the body portion and the movement of the translation member from the second end of the body portion to the first end of the body portion in a second direction causes the first and second endplates to move in a direction towards the body portion, and wherein the movement of the translation member in the first direction moves the first and second angled surfaces in the same direction along the first and second ramped portions of the first endplate and the third and fourth angled surfaces along the third and fourth ramped portions of the second endplate wherein the first and second angled surfaces are at a first distance from each other when the first endplate is in an unexpanded position and at a second distance at an expanded position, wherein the first and second distances are equal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An intervertebral implant comprising:
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a body portion comprising a first end, a second end, a first side portion connecting the first end and the second end, and a second side portion connecting the first end and the second end, the first end, second end, first side portion and second side portion defining a central opening; a first endplate comprising a first ramped portion, and a second ramped portion, the first and second ramped portions extending into the central opening, a translation member comprising an expansion portion, at least a portion of the translation member is received within the central opening, the expansion portion comprising first and second angled surfaces, the first and second angled surfaces engaging the first and second ramped portions of the first endplate; wherein movement of the translation member in the first direction moves the first and second angled surfaces in the same direction along the first and second ramped portions of the first endplate, wherein the first and second angled surfaces are at a first distance from each other when the first endplate is in an unexpanded position and at a second distance in an expanded position, wherein the first and second distances are equal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method of installing an intervertebral implant, the method comprising:
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positioning the intervertebral implant between adjacent vertebrae, the intervertebral implant comprising a body portion with a first end and a second end, a first endplate having first and second ramped surfaces, an actuation member, a translation member with an expansion portion, the expansion portion comprising a first angled surface and a second angled surface; rotating the actuation member of the intervertebral implant in a first direction, wherein the rotation of the actuation member moves the translation member of the implant in a first direction and thereby the first angled surface abuts and pushes against the first ramped surface on the first endplate and the second angled surface abuts and pushes against the second ramped surface on the first endplate moving the first endplate in a direction away from the body portion into an expanded position, wherein the first and second angled surfaces are at a first distance from each other when the first endplate is in an unexpanded position and at a second distance in an expanded position, wherein the first and second distances are equal.
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Specification