Patent ID: 8956412
Filing Date: 2015-02-17
Classification: A61F

Abstract:
1. An artificial disc to replace a damaged spinal disc in a spinal column, said artificial disc comprising: a first retainer engagable with a first vertebra; a second retainer engagable with a second vertebra; and an intermediate section disposed between and connected with said first and second retainers, said intermediate section includes a first portion which resists relative rotation between said first and second retainers from a first position of said first retainer relative to said second retainer to a second position of said first retainer relative to said second retainer and a second portion which resists relative rotation between said first and second retainers from said second position of said first retainer relative to said second retainer to a third position of said first retainer relative to said second retainer, said second portion of said intermediate section being ineffective to provide significant resistance to relative rotation between said first and second retainers during rotation of said first retainer relative to said second retainer from the first position to the second position.