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US 9,801,639 B2Granted
Lateral spondylolisthesis reduction cage
AssigneeDePuy Synthes Products, Inc.
InventorsMichael J O'Neil, Hassan Serhan, Douglas Raymond, John Riley Hawkins
Life of this patent
Estimating the term…
Abstract
An intervertebral fusion device comprising inferior and superior fusion cage devices that provide an ability to correct spondylolisthesis via in-situ adjustment.
Claims16
An intervertebral fusion device for correcting spondylolisthesis in a patient, comprising:
- a) an upper cage having an anterior wall, a posterior wall, and a proximal wall and a distal wall connecting the anterior and posterior walls, and an upper surface for contacting an upper vertebral body and a lower surface having a first groove therein,
- b) a lower cage having an anterior wall, a posterior wall, 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 an upper surface having a second groove therein,
- wherein the lower surface of the upper cage contacts the upper surface of the lower cage so that the first and second grooves form a first throughhole running from the proximal wall to about the distal wall;
- and
- c) a locking plate disposed in the first throughhole, wherein the locking plate is disposed in the first throughhole when the lower surface of the upper cage contacts the upper surface of the lower cage;
- and
- (d) a rotary spreader rotatably disposed between the upper cage and the lower cage such that, when rotated, the spreader causes the upper endplate to translate relative to the lower endplate in an anterior-posterior direction.
4 more elements
An intervertebral fusion device comprising:
- a) an upper endplate having an anterior wall, a posterior wall, and a first side wall and a second side wall connecting the anterior and posterior walls, and an upper surface for contacting an upper vertebral body and a lower surface,
- b) a lower endplate having an anterior wall, a posterior wall, and a first side wall and a second side wall connecting the anterior and posterior walls, and a lower surface for contacting a lower vertebral body and an upper surface,
- wherein the anterior wall of the upper endplate is connected to the anterior wall of the lower endplate by a first dual linkage;
- wherein the posterior wall of the upper endplate is connected to the posterior wall of the lower endplate by a second dual linkage;
- and
- wherein the linkages allow the upper endplate to translate relative to the lower endplate in an anterior-posterior direction and in a height direction that is perpendicular to the anterior-posterior direction.
3 more elements
An intervertebral fusion device comprising:
- an upper endplate and a lower endplate, the device having a collapsed configuration, in which the upper and lower endplates are separated by a first distance in a height direction, and an expanded configuration, in which the upper and lower endplates are separated by a second distance in the height direction, the second distance being greater than the first distance,
- wherein an anterior wall of the upper endplate is connected to an anterior wall of the lower endplate by a first dual linkage;
- wherein a posterior wall of the upper endplate is connected to a posterior wall of the lower endplate by a second dual linkage;
- and
- wherein the upper endplate translates in the height direction and in an anterior-posterior direction perpendicular to the height direction with respect to the lower endplate as the device moves from the collapsed configuration to the expanded configuration.
2 more elements
Dependencies are inferred from the claim text.