1
Bryan Cornwall, James F Marino, Dan Ahlgren, Troy Wooley: Facet screw and bone allograft intervertebral support and fusion system. NuVasive, Jonathan Spangler, November 26, 2002: US06485518 (321 worldwide citation)

An intervertebral support assembly, comprising a pair of bone allografts positioned between two adjacent vertebrae, the bone allografts being positioned towards the anterior portion of the adjacent vertebrae; and a pair of facet screws, each facet screw securing together a facet joint between the tw ...


2
Dan Ahlgren, Bret Ferree, Keith Valentine, Patrick Miles: System and method for performing spinal fixation. NuVasive, Jonathan Spangler, Rory Schermerhorn, November 16, 2010: US07833251 (70 worldwide citation)

The present invention relates to medical devices and methods generally aimed at spinal surgery. In particular, the disclosed system and associated methods relate to performing spinal fixation.


3
Matthew Curran, Eric Kovach, Dan Ahlgren, Bryan Hildebrand: Spinal implant inserter, implant, and method. NuVasive, Johnathan Spangler, August 17, 2010: US07776049 (45 worldwide citation)

An improved implant inserter and implant where the inserter includes a set of prongs for gripping the implant and the implant includes a plurality of recesses for mating with the set of prongs.


4
Forrest Samuel, Rob German, Rich Mueller, Eric Dasso, Robert Riley, Dan Ahlgren: System and method for performing spinal fixation. NuVasive, Jonathan Spangler, Rory Schermerhorn, July 9, 2013: US08480712 (22 worldwide citation)

A spinal fixation system suitable for effecting fixation between adjacent vertebral levels within the spine. The spinal fixation system of the present invention includes a pair single axis or “fixed” pedicle screw assemblies, a pair of poly-axial pedicle screw assemblies, a pair of cannulated rod me ...