Artificial disc
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 17, 2015
Grant Date -
Dec 25, 2008
app pub date -
Jun 22, 2007
filing date -
Jun 22, 2007
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An artificial disc includes an intermediate section which is disposed between upper and lower retainers. The intermediate section includes a first portion which resists rotation of one of the retainers, for example, the upper retainer, from a first position to a second position. A second portion of the intermediate section of the artificial disc resists rotation of the upper retainer from the second position to a third position. The second portion of the intermediate section of the artificial disc is ineffective to provide significant resistance to relative rotation between the retainers during rotation of the upper retainer relative to the lower retainer from the first position to the second position. The artificial disc may be provided with projections which engage protrusions on the intermediate section to resist rotation of the upper retainer relative to the lower retainer from the second position to the third position.
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Cited Art Landscape
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