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US 11,951,016 B2Granted
Spinal fusion device with staged expansion
AssigneeIntegrity Implants Inc.
InventorEugene Shoshtaev
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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. The fusion device described herein is capable of being installed inside an intervertebral disc space at a minimum to no distraction height and for a fusion device capable of maintaining a normal distance between adjacent vertebral bodies when implanted.
Claims16
An expandable fusion device for implantation between two adjacent vertebrae, the device comprising:
- a wedge assembly comprising a first wedge and a second wedge;
- a ramp assembly slidably coupled with the wedge assembly;
- an upper endplate assembly slidably coupled with the ramp assembly;
- and,
- a lower endplate assembly slidably coupled with the ramp assembly;
- wherein the device is configured such that
- a first movement comprising translating the first wedge a first distance towards or away from the second wedge increases the width without increasing the height;
- a second movement comprising translating the first wedge a second distance beyond the first distance towards or away from the second wedge increases the height;
- and
- a third movement comprising translating the first wedge a third distance beyond the second distance towards or away from the second wedge provides a further height expansion without a width expansion;
- and
- wherein the first movement further comprises a sliding at the slidable coupling between the ramp assembly and the wedge assembly.
9 more elements
Dependencies are inferred from the claim text.