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 and the at least one single wall and the at least one channel forming a traveling guide with the at least one single wall and the at least one dual wall slidably engaged with one another when the first vertebral body interface surface and the third vertebral body interface surface travel away from one another;
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, andat least one spacer to form a friction fit with the at least one single wall, whereinrotating 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 first part and the second part in the at least one expanded state.
7 Assignments
0 Petitions
Accused Products
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.
473 Citations
18 Claims
-
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 and the at least one single wall and the at least one channel forming a traveling guide with the at least one single wall and the at least one dual wall slidably engaged with one another when the first vertebral body interface surface and the third vertebral body interface surface travel away from one another; 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 first part and the second part in the at least one expanded state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. 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; a plurality of dual walls coupled to the second surface and extending from the second surface towards the fourth surface, each of the dual walls forming a channel; a plurality of single walls corresponding to the plurality of dual walls, each single wall coupled to the fourth surface and extending from the fourth surface towards the second surface, each of the single walls aligned in sliding relation with a corresponding channel forming a traveling guide with the plurality of single walls and the plurality of dual walls slidably engaged with one another when the first vertebral body interface surface and the third vertebral body interface surface travel away from one another; the plurality of dual walls and the second surface defining a recess; a removable, expandable member residing in the 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 first part and the second part in the at least one expanded state. - View Dependent Claims (13, 14)
-
-
15. An expandable fusion device comprising:
-
a first part having a first vertebral body contacting surface and a first side wall extending away from the first vertebral body contacting surface; a second part having a second vertebral body contacting surface and a second side wall extending away from the second vertebral body contacting surface, the first and second sidewalls overlapping in sliding arrangement forming a traveling guide with the first and second sidewalls slidably engaged with one another when the first vertebral body contacting surface and the second vertebral body contacting surface interface surface travel away from one another such that the spacing between the first vertebral body contacting surface and second vertebral body contacting surface is adjustable; and a spacer engageable with at least one of the sidewalls to fix a minimum spacing between the first vertebral body contacting surface and second vertebral body contacting surface. - View Dependent Claims (16, 17, 18)
-
Specification