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US 8,523,946 B1Granted
Stand-alone spinal cage
OwnerKarl W. Swanninventor
Life of this patent
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Abstract
A spinal cage device for fusion of spinal vertebrae comprising a cage body having a cavity defined by upper, lower, and side walls; a piston selectively insertable into the cavity through a side wall, the piston having at least one angled surface; at least one channel extending through at least one of the upper wall and the lower wall; at least one fastening member moveable within the at least one channel between a first disengaged position and a second engaged position; and wherein in second engaged position the at least one fastening member is held substantially stationary relative to the cage body by contact with the piston. According to one aspect of the invention, the device includes a locking means for supplementing fixation of the piston to the cage body.
Claims32
A spinal cage device for fusion of spinal vertebrae comprising:
- a cage body having upper, lower, and side walls that a define a cavity, said upper and lower walls having bone growth openings therethrough, said side walls including a posterior sidewall with a piston opening therethrough and an anterior sidewall;
- a piston having a piston body with anterior and posterior ends, said piston body being insertable along a longitudinal axis into said cavity through said piston opening, wherein said piston body comprise at least two angled surfaces adjacent to said anterior end;
- at least two fastening member channels extending through said upper and lower walls;
- at least two fastening members moveable within said at least two fastening member channels between a first disengaged position and a second engaged position;
- wherein in said second engaged position said at least two fastening members contact said piston body and are stationary relative to said cage body;
- at least one longitudinal guiding member extending into said cavity from at least one of said upper wall and said lower wall;
- at least two shoulder formed in the piston body, said at least two shoulder having a first thickness;
- at least two engagement surfaces positioned between said at least one shoulder and said at least two angled surfaces;
- wherein said at least two angled surfaces comprise a first angled surface angled at a first angle relative to a horizontal plane and a second angled surface angled at a second angle relative to said horizontal plane;
- and
- wherein said piston body defines at least one alignment groove formed longitudinally along said piston body and intersecting said anterior end.
8 more elements
A spinal cage device for fusion of spinal vertebrae comprising:
- a cage body having upper, lower, and side walls that a define a cavity, said upper and lower walls having bone growth openings therethrough, said side walls including a posterior sidewall with a piston opening therethrough and an anterior sidewall;
- a piston having a piston body with anterior and posterior ends, said piston body being insertable along a longitudinal axis into said cavity through said piston opening, wherein said piston body comprise at least two angled surfaces adjacent to said anterior end;
- at least two fastening member channels extending through said upper and lower walls;
- at least two fastening members moveable within said at least two fastening member channels between a first disengaged position and a second engaged position;
- wherein in said second engaged position said at least two fastening members contact said piston body and are stationary relative to said cage body;
- at least two shoulders formed in the piston body, said at least two shoulders having a first thickness;
- at least two engagement surfaces positioned between said at least one shoulder and said at least two angled surfaces;
- wherein said at least two angled surfaces comprise a first angled surface angled at a first angle relative to a horizontal plane and a second angled surface angled at a second angle relative to said horizontal plane;
- two lower guiding members member extending into said cavity from said lower wall;
- two upper guiding members extending into said cavity from said upper wall;
- wherein said piston body defines longitudinal grooves engagable with said guiding members;
- and
- wherein in said second engaged position said upper and lower guiding members are positioned within said longitudinal grooves.
10 more elements
A spinal cage device for fusion of spinal vertebrae comprising:
- a cage body having upper, lower, and side walls that a define a cavity, said upper and lower walls having bone growth openings therethrough, said side walls including a posterior sidewall with a piston opening therethrough and an anterior sidewall;
- a piston having a piston body with anterior and posterior ends, said piston body being insertable along a longitudinal axis into said cavity through said piston opening, wherein said piston body comprise at least two angled surfaces adjacent to said anterior end and a faceplate;
- a screw and a screw mount;
- at least two fastening member channels extending through said upper and lower walls;
- at least two fastening members moveable within said at least two fastening member channels between a first disengaged position and a second engaged position;
- wherein in said second engaged position said at least two fastening members contact said piston body and are stationary relative to said cage body;
- at least one lock opening proximal to said piston opening;
- a locking member rotatably-connected to said faceplate;
- and
- wherein said locking member comprising a body portion rotatably-connected to said faceplate and at least one finger extending from said body portion;
- wherein in said second engaged position said locking member is rotatable to a locked position in which a portion of said locking member extends into said at least one lock opening and a portion of said locking member is positioned adjacent said screw;
- wherein in said second engaged position said at least one finger is positioned in said lock opening and adjacent said screw.
9 more elements
Dependencies are inferred from the claim text.