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Compressible, rotatable, and tiltable hydraulic spinal disc prosthesis system with selectable modular components

  • US 20090005874A1
  • Filed: 08/28/2008
  • Published: 01/01/2009
  • Est. Priority Date: 04/22/2003
  • Status: Abandoned Application
First Claim
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1. A modular spinal disc prosthesis system for a surgical implantation of an individually optimized compressible, rotatable and tiltable hydraulic spinal disc prosthesis assembly between a pair of adjacent vertebrae, comprising:

  • (a) a pair of selectable opposed crown plate modules, including a selectable cephalad crown plate module and a selectable caudal crown plate module, with each selectable crown plate module having a predetermined lordotic angle, a predetermined cross-sectional profile, with each of said selectable opposed crown plate modules being fixedly engageable with a vertebral endplate by a plurality of vertebra engaging members fixedly connected to a vertebra engaging surface of each of said selectable opposed crown plate modules;

    (b) at least one selectable, compressible, rotatable and tiltable hydraulic disc prosthesis cartridge module, with each selectable disc prosthesis cartridge module comprising an axial load dampening mechanism of a predetermined size and a predetermined load-bearing capacity, wherein at least one selectable cartridge module is sandwiched connectedly between and coupled to said opposed selectable crown plate modules, said load dampening mechanism including a compressible tiltable bellows assembly containing at least one fluid, a dashpot assembly comprising a ceramic spherical bearing surrounded by a pair of ceramic rings, all mounted within a ceramic retaining ring; and

    (c) an insertion instrument to facilitate the surgical implantation of said individualized spinal disc prosthesis assembly, wherein said individualized compressible, rotatable and tiltable hydraulic spinal disc prosthesis assembly, comprised of said selectable disc prosthesis cartridge module connectedly interposed between said pair of selectable opposed crown plate modules, is optimized on a patient-by-patient basis;

    wherein said axial load dampening mechanism further comprises at least one biasing member positioned within said bellows assembly in co-axial proximity to said dashpot assembly.

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