| http://www.w3.org/ns/prov#value | - This porous bag is distinguished from several other artificial disc designs described in the '679 patent, including an artificial disc with an elastomeric core (U.S. Pat. No. 5,071,437) or filled with hydrogel beads (U.S. Pat. No. 5,192,326). [0036] In a further disc augmentation approach described in U.S. Pat. No. 5,888,220, the disc is accessed laterally through the patient's body, the annulus i
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