Expandable spinal cage assemblies for supporting bone structures
AssigneeZavation Medical Products, LLC
InventorJohn Franklin Cummins
Life of this patent
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Abstract
A spinal implant for placement between first and second vertebrae includes a housing having first and second axial end surfaces and a bore extending along an axis through the housing and between the end surfaces. A first projection extends at least partially about the axis and including a channel. A lift is slidably received in the bore and includes threads along its length. A collar is threadably engaged with the lift and extends into the channel on the housing such that the projection prevents axial movement of the collar relative to the housing. Rotation of the collar about the axis causes the lift to move axially relative to the collar and the housing for adjusting the height of the implant.
Claims28
A spinal implant for placement between first and second vertebrae, comprising:
- a housing having,
- a) an inner surface comprising at least one planar portion,
- b) first and second axial end surfaces,
- c) a bore extending along an axis through the housing and between the end surfaces,
- d) a first projection extending axially away from a perimeter of one of the first and second axial end surfaces and extending at least partially about the axis, and
- e) a channel formed in the first projection and opening radially inward;
- a lift slidably received in the bore and including threads along its length, the lift having at least one planar surface forming at least one flat extending axially along the length of the threads;
- and
- a collar comprising a flange connected to a gearwheel for rotating the collar, the collar threadably engaged with the lift, and the channel formed in the first projection of the housing accommodating therein the flange and the gearwheel such that the first projection prevents axial movement of the collar relative to the housing,
- wherein rotation of the collar about the axis causes the lift to move axially relative to the collar and the housing for adjusting the height of the implant, and
- wherein the at least one planar portion of the housing cooperates with the at least one flat on the lift to prevent rotation of the lift relative to the housing.
Dependencies are inferred from the claim text.