Fernand Navas: Intervertebral stabilization device incorporating dampers. Societe PSI, Dowell & Dowell, July 30, 1996: US05540688 (610 worldwide citation)

An intervertebral stabilization device is disclosed, made in the form of a damper adapted to resist elastically, on the one hand, an elongation and, on the other hand, an axial compression without buckling, as well as of at least two implants anchored on two adjacent vertebrae.

Fernand Navas: Application of an improved damper to an intervertebral stabilization device. Societe PSI, Dowell & Dowell, December 27, 1994: US05375823 (491 worldwide citation)

An improved damper, of the type comprising elements for progressively resisting, in exponential manner, the advance of a piston under the effect of a force of axial compression, which functions as a stop opposing any displacement of the piston beyond a predetermined value, in an intervertebral stabi ...

Fernand Navas: Extra-discal inter-vertebral prosthesis for controlling the variations of the inter-vertebral distance by means of a double damper. PSI, Dowell & Dowell, January 2, 1996: US05480401 (350 worldwide citation)

A prosthesis with double damper performing the function of intervertebral stabilizer which comprises at least two identical elements assembled together and comprising elastic bodies for regulating the bending-stretching movement between two vertebrae so as to approach as closely as possible the phys ...

Fernand Navas: Fastening for interpedicular vertebral prosthesis components - comprises bone-implanted shafts, with spherical heads engaged over upper portions for cooperation with prosthesis-attached rings. Psi, February 4, 1994: FR2694182-A1 (40 worldwide citation)

The fastening assembly includes a bone-implanted shaft (1) with a cylindrical portion (1d) to which a head (2) is attachable. A spherical head (3) with an axial hole (3a) fits over the cylindrical portion of the shaft. The spherical head cooperates precisely with a ring (4) attached to a prosthesis ...

Fernand Navas: Extradiscal intravertebral prosthesis for the control of intervertebral distance variations by means of a double damper.. Psi, August 26, 1994: FR2701650-A1 (19 worldwide citation)

Damper (shock-absorber), of the type comprising: (1) an elastic body whose volume is less than that of the chamber defined by the free position of the piston with respect to the bottom of the cylinder, consisting of the elements (1 or 1' or 10 or 10') (2) a hollow cylinder (1a) pierced with a throug ...

Fernand Navas: Double shock-absorber for intervertebral stabilisation. Psi, August 26, 1994: FR2701651-A1 (15 worldwide citation)

It comprises at least one cylinder (1) of which one of the ends is closed by a bottom (2) while the other end comprises a ring (5) which allows connection to another cylinder (1), the median part of the cylinder (1) being pierced with a through hole (1a) for fitting a tubular sleeve (3) which is int ...

Fernand Navas: Dampers with improved damping at the end of stroke.. Psi, December 31, 1993: FR2692952-A1 (4 worldwide citation)

An improved damper of the type comprising means for progressively resisting in an exponential manner the advance of a piston under the effect of an axial pressure force, the said means constituting a limit stop opposing any stroke of the piston beyond a defined value of this stroke, and application ...