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US 8,845,733 B2Granted
Lateral spondylolisthesis reduction cage
AssigneeDePuy Synthes Products, Inc.
InventorsMichael J O'Neil, Hassan Serhan, Douglas Raymond, John Riley Hawkins
Life of this patent
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Abstract
An intervertebral fusion device comprising inferior and superior fusion cage devices that provide an ability to correct spondylolisthesis via in-situ adjustment.
Claims1
An intervertebral fusion device for correcting spondylolisthesis in a patient, comprising:
- a) an upper cage having an anterior wall, a posterior wall, a lower surface, and a proximal wall and a distal wall connecting the anterior and posterior walls, and a throughole present at the upper edge of the proximal wall for receiving a bone screw,
- b) a lower cage having an anterior wall, a posterior wall, an upper surface, and a proximal wall and a distal wall connecting the anterior and posterior walls, and a lower surface for contacting a lower vertebral body, and a throughole present at the lower edge of the proximal wall for receiving a bone screw,
- wherein the proximal wall of the upper cage has a lower through-hole adapted for receiving a fixation device and wherein the proximal wall of the lower cage has an upper through-hole adapted for receiving a fixation device, and
- c) a fixation device disposed in each respective through-hole,
- d) a bone screw disposed in each respective throughole,
- wherein the lower surface of the upper cage slidingly mates with the upper surface of the lower cage to allow linear anterior-posterior relative movement of the cages,
- wherein the lower surface of the upper cage and the upper surface of the lower cage have matching ratchet teeth.
4 more elements
Dependencies are inferred from the claim text.