Patent ID: 6764515
Filing Date: 2004-07-20
Classification: A61F

Abstract:
An intervertebral spacer device, comprising:first and second plates, each having an outwardly facing plate surface and an inwardly facing plate surface, the plates being disposed such that the inwardly facing plate surfaces are directed toward one another and the outwardly facing plate surfaces are directed away from one another; and at least one restoring force providing element disposed between said inwardly facing surfaces, and disposed such that a load applied to the outwardly facing surfaces is counteracted by the at least one restoring force providing element; the at least one restoring force providing element including a belleville washer having a first end and a second end, the belleville washer being rigidly fixed at the first end to the inwardly facing surface of the first plate and rotationally mounted at the second end to the inwardly facing surface of the second plate; and wherein the belleville washer has a spiral slot.