Patent ID: 11911286
Assignee: SIMPLIFY MEDICAL PTY LTD.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. An intervertebral prosthesis for insertion between adjacent vertebrae, the prosthesis comprising:
a first plate having an outer surface locatable against a first vertebra and an inner curved surface, wherein a first central projection extends from the inner curved surface and includes a tapered portion a distance from the first plate,
wherein the outer surface of the first plate includes a plurality of raised features on the outer surface of the first plate, the plurality of raised features including a plurality of pyramidal serrations on an outer portion of the outer surface and a first plurality of truncated pyramidal serrations on an inner portion of the outer surface, and
the outer surface of the first plate includes an intermediate portion between the outer portion and the inner portion, and the plurality of raised features further includes a second plurality of truncated pyramidal serrations, the second plurality of truncated pyramidal serrations being truncated to a lesser degree with respect to the plurality of pyramidal serrations than the first plurality of truncated pyramidal serrations;

a second plate having an outer surface locatable against a second vertebra and an inner curved surface, wherein a second central projection extends from the inner curved surface toward the first plate;
a ring shaped core having a cross section with a trapezoidal shape, the core having upper and lower curved surfaces complementary in shape to the inner curved surfaces of the first and second plates to allow the plates to slide over the upper and lower surfaces of the core, and a central opening in the core configured to receive the first and second central projections;
wherein the first central projection having the tapered portion, the second central projection, and the central opening cooperate with one another to retain the core between the plates and limit motion of the first and second plate with respect to one another to limit contact between annular perimeter surfaces of the first plate and the second plate during sliding movement of the first plate and the second plate over the core, and
wherein each of the first central projection and the second central projection have a diameter that is smaller than a smallest diameter of the central opening.