Intervertebral spacer device having a radially thinning slotted belleville spring
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United States of America Patent
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-
May 25, 2004
Grant Date -
Aug 15, 2002
app pub date -
Oct 1, 2001
filing date -
Feb 15, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An intervertebral spacer device having a pair of opposing plates for seating against opposing vertebral bone surfaces, separated by at least one spring mechanism. A first plate of this embodiment includes a post extending upwardly from the inner surface of the plate, the post including a ball-shaped head. The post is designed to flexibly support a slotted belleville washer, which can be selectively mounted to the head such that the wider portion of the washer seats against the second plate. Compression of the assembly causes a deflection of the slotted belleville washer. The slotted belleville washer of this invention has a radially varying thickness which permits the load deflection profile to mimic that of the natural cartilage which is being replaced.
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