Expandable facet joint fixation device
OwnerLoubert S. Suddabyinventor
Life of this patent
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Abstract
An expandable facet joint fixation device, including a first collar, a central shaft including a first end and a second end, the first end rotatably connected to the first collar, a second collar including a radially inward facing surface, the second collar concentrically arranged around the central shaft, and one or more expandable members, each of the one or more expandable members including a first arm hingedly connected to the first collar, a second arm hingedly connected to the second collar, the second arm hingedly connected to the first arm, wherein when the second collar is displaced in a first axial direction relative to the first collar, the one or more expandable members displace radially outward in a first radial direction.
Claims19
An expandable facet joint fixation device, comprising:
- a first collar;
- a central shaft including a first end and a second end, the first end rotatably connected to the first collar;
- a second collar including a radially inward facing surface, the second collar concentrically arranged around the central shaft;
- and,
- one or more expandable members, each of the one or more expandable members including:
- a first arm hingedly connected to the first collar;
- and,
- a second arm hingedly connected to the second collar, the second arm hingedly connected to the first arm,
- wherein at least one of the one or more expandable members comprises at least one cutting surface wherein the at least one cutting surface is arranged to be rotated to cut through cortical bone;
- wherein when the second collar is displaced in a first axial direction relative to the first collar, the one or more expandable members displace radially outward in a first radial direction.
An expandable joint fixation device, comprising:
- an expansion cage, including:
- a first collar;
- a second collar having a radially inward facing surface with interior threading;
- and,
- one or more expandable members, at least one of the one or more expandable members includes at least one cutting surface;
- and,
- a central shaft extending through the second collar, the central shaft including:
- a first end rotatably connected to the first collar;
- and,
- a radially outward facing surface having exterior threading, the exterior threading being threadably engaged with the interior threading;
- wherein:
- when the second collar is displaced in a first axial direction relative to the first collar, the one or more expandable members displace radially outward in a first radial direction;
- and,
- the one or more expandable members are operatively arranged to be rotated to cut through cortical bone.
An expandable joint fixation device, comprising:
- an expansion cage, including:
- a first collar;
- a second collar having a radially inward facing surface with interior threading;
- and,
- one or more expandable members, each of the one or more expandable members hingedly connected to the first and second collars, wherein at least one of the one or more expandable members includes at least one cutting surface operatively arranged to cut through cortical bone;
- and,
- a central shaft extending through the second collar, the central shaft being hollow and including:
- a first end rotatably connected to the first collar;
- a radially outward facing surface having exterior threading threadably engaged with the interior threading;
- and,
- one or more holes;
- wherein:
- when the central shaft is rotated in a first circumferential direction, relative to the second collar, the second collar is displaced in a first axial direction relative to the first collar and the one or more expandable members displace radially outward in a first radial direction;
- and,
- when the central shaft is rotated in a second circumferential direction, opposite the first circumferential direction, relative to the second collar, the second collar is displaced in a second axial direction, opposite the first axial direction, relative to the first collar and the one or more expandable members displace radially inward in a second radial direction, opposite the first radial direction.
Dependencies are inferred from the claim text.