1
Charles D Ray, Eugene A Dickhudt, Robert L Assell: Prosthetic spinal disc nucleus. RayMedica, Dicke Billig & Czaga P A, October 20, 1998: US05824093 (473 worldwide citation)

An elongated, capsule shaped prosthetic spinal disc nucleus body for implantation into a human inter vertebral spinal disc, made of a hydrogel core and a constraining jacket surrounding the hydrogel core that permits the hydrogel core to deform and reform. The constraining jacket is configured to al ...


2
Robert L Assell, Charles D Ray: Percutaneous prosthetic spinal disc nucleus and method of manufacture. RayMedica, Dicke Billig & Czaja P A, February 8, 2000: US06022376 (425 worldwide citation)

A capsule-shaped prosthetic spinal disc nucleus for implantation into a human intradiscal space, made of a substantially inelastic constraining jacket surrounding an amorphous polymer core. The constraining jacket has a generally fixed maximum volume and defines a height. The amorphous polymer core ...


3
Charles D Ray, Robert L Assell: Tapered prosthetic spinal disc nucleus. Raymedica, Dicke Billig & Czaja P A, October 17, 2000: US06132465 (397 worldwide citation)

A wedge-shaped prosthetic spinal disc nucleus including a hydrogel core surrounded by a constraining jacket. The hydrogel core is preshaped to form the wedge shape in a hydrated state. The constraining jacket is flexible, but substantially inelastic and is configured to prevent the hydrogel core fro ...


4
Charles D Ray, Robert L Assell: Trial implant and trial implant kit for evaluating an intradiscal space. Raymedica, Dicke Billig & Czaja P A, September 5, 2000: US06113639 (302 worldwide citation)

A trial implant for evaluating a size of an intradiscal space for subsequent implantation of a prosthetic spinal disc nucleus. The trial implant is comprised of an elongated central body and a retrieving body. The elongated body is formed from a rigid, surgically safe material and preferably has a v ...


5
Andrew H Cragg, Robert L Assell, Eugene A Dickhudt: Method and apparatus for spinal distraction and fusion. TranS1, Knobbe Martens Olson & Bear, July 26, 2005: US06921403 (246 worldwide citation)

The invention provides an implantable spinal distraction/fusion rod with varied thread pitch and diameters along different portions of its length that it is capable of distracting two or more vertebral bodies relative to each other and/or facilitating the procedure of fusing the vertebral bodies tog ...


6
Charles D Ray, Robert L Assell: Prosthetic spinal disc nucleus having a shape change characteristic. Raymedica, Dicke Billig & Czaja PLLC, August 5, 2003: US06602291 (141 worldwide citation)

A prosthetic spinal disc nucleus comprising a hydrogel core surrounded by a constraining jacket. The hydrogel core is configured to expand from a dehydrated state to a hydrated state. In the dehydrated state, the hydrogel core has a shape selected to facilitate implantation through an anulus opening ...


7
Michael S Thorud, Robert L Assell: Guidewire extension system with tactile connection indication. Lake Region Manufacturing Company, Grady J Stroud Stroud Willink Thompson & Howard Frenchick, August 20, 1996: US05546958 (123 worldwide citation)

A guidewire extension system including a guidewire and an extension wire is disclosed. The system includes female and male connector segments located on the proximal end of the guidewire or the distal end of the extension wire. The hollow female connector segment, in one embodiment, includes a radia ...


8
Andrew H Cragg, Robert L Assell, Steven D Ainsworth, Eugene A Dickhudt, Bradley J Wessman: Dual anchor prosthetic nucleus apparatus. Trans1, Kevin W Cyr, Cyr & Associates P A, February 17, 2009: US07491236 (79 worldwide citation)

A spinal mobility preservation apparatus and methods are disclosed. The spinal mobility preservation apparatus may include a proximal body, an intermediate body, a distal body, and an expandable membrane. The proximal body and the distal body secure the mobility preservation apparatus to adjacent ve ...


9
Robert L Assell, Steven D Ainsworth, Andrew L Cragg, Eugene A Dickhudt: Method and apparatus for manipulating material in the spine. TranS1, Knobbe Martens Olson & Bear, March 10, 2009: US07500977 (74 worldwide citation)

Disclosed are surgical tools, tool sets and methods for percutaneously accessing and preparing treatment sites within the spine for subsequent treatment procedures. The treatment site may be an inter-vertebral motion segments in the lumbar and sacral regions of the spine. The tool set may comprise i ...


10
Andrew H Cragg, Robert L Assell, Steven D Ainsworth, Eugene A Dickhudt, Bradley J Wessman: Spinal mobility preservation apparatus. Transl, Clise Billion & Cyr P A, February 16, 2010: US07662173 (67 worldwide citation)

A spinal mobility preservation apparatus and methods are disclosed. The spinal mobility preservation apparatus may include a proximal body, an intermediate body, a distal body, and an expandable membrane. The proximal body and the distal body secure the mobility preservation apparatus to adjacent ve ...