EXPANDABLE SPINAL FUSION CAGE
First Claim
Patent Images
1. An expandable fusion device for use in fusing a vertebral segment, comprising:
- a first part;
a second part slidably connected to the first part;
the first part comprising a first vertebral body interface surface and a second surface opposite the first vertebral body interface surface;
the second part comprising a third vertebral body interface surface and a fourth surface opposite the third vertebral body interface surface;
at least one dual wall coupled to the second surface and extending from the second surface towards the fourth surface, the at least one dual wall forming at least one channel;
at least one single wall coupled to the fourth surface and extending from the fourth surface towards the second surface, the at least one single wall aligned with the at least one channel;
a removable, expandable member extending from the second surface to the fourth surface, the removable, expandable member having a collapsed state and at least one expanded state;
an operating arm having a proximate end coupled to the removable, expandable member and a distal end coupled to a rotating operator, and at least one spacer to form a friction fit with the at least one single wall, wherein rotating the rotating operator causes the operating arm to move the removable, expandable member from the collapsed state to the at least one expanded state and the at least one spacer locks the removable, expandable member in the at least one expanded state.
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Abstract
An expandable spinal fusion device is provided. The expandable device comprises a first part slidingly coupled to a second part. An removable expandable member extends between the first part and the second part and is coupled to a rotating operator such that rotating the operator causes the first part and the second part to move away from each other and distract vertebral bodies. A spacer or clip is used to lock the first part in relation to the second part to allow bone growth the fuse the vertebral bodies.
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Citations
22 Claims
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1. An expandable fusion device for use in fusing a vertebral segment, comprising:
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a first part; a second part slidably connected to the first part; the first part comprising a first vertebral body interface surface and a second surface opposite the first vertebral body interface surface; the second part comprising a third vertebral body interface surface and a fourth surface opposite the third vertebral body interface surface; at least one dual wall coupled to the second surface and extending from the second surface towards the fourth surface, the at least one dual wall forming at least one channel; at least one single wall coupled to the fourth surface and extending from the fourth surface towards the second surface, the at least one single wall aligned with the at least one channel; a removable, expandable member extending from the second surface to the fourth surface, the removable, expandable member having a collapsed state and at least one expanded state; an operating arm having a proximate end coupled to the removable, expandable member and a distal end coupled to a rotating operator, and at least one spacer to form a friction fit with the at least one single wall, wherein rotating the rotating operator causes the operating arm to move the removable, expandable member from the collapsed state to the at least one expanded state and the at least one spacer locks the removable, expandable member in the at least one expanded state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for fusing vertebral bodies, comprising the steps of:
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inserting an expandable fusion device in an intervertebral disc space in the collapsed state;
expanding an expandable member to cause the expandable fusion device to move from the collapsed state to an expanded state and separate superior and inferior vertebral discs;placing a locking spacer to lock the expandable fusion device in the expanded state; and removing the expandable member. - View Dependent Claims (13, 14, 15, 16, 17)
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18. An expandable fusion device for use in fusing a vertebral segment, comprising:
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a first part; a second part slidably connected to the first part; the first part comprising a first vertebral body interface surface and a second surface opposite the first vertebral body interface surface; the second part comprising a third vertebral body interface surface and a fourth surface opposite the third vertebral body interface surface; means for slidably coupling the first part and the second part; a removable, expandable member residing in a recess and extending from the second surface to the fourth surface, the removable, expandable member having a collapsed state and a plurality of predetermined expanded states; an operating arm having a proximate end coupled to the removable, expandable member and a distal end coupled to a rotating operator, and a plurality of spacers with at least one of the plurality of spacers corresponding to each of the plurality of predetermined expanded states, each spacer to form a friction fit with the plurality of single walls, wherein rotating the rotating operator causes the operating arm to move the removable, expandable member from the collapsed state to the at least one expanded state and the at least one spacer locks the removable, expandable member in the at least one expanded state. - View Dependent Claims (19, 20, 21, 22)
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Specification