Artificial intervertebral disc flexibly oriented by spring-reinforced bellows
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United States of America Patent
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Jan 10, 2006
Grant Date -
Dec 9, 2004
app pub date -
Jun 5, 2004
filing date -
Jun 6, 2003
priority date (Note) -
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Abstract
An artificial intervertebral disc includes: an upper retaining member secured to an upper vertebra; a lower retaining member secured to a lower vertebra adjacent to the upper vertebra; and a nucleus member flexibly resiliently formed between the upper and the lower retaining members having at least an outer and an inner bellows each reinforced and integrally formed with a helical spring to define an outer annulus between the outer and inner bellows and a core formed within the inner bellows.
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