Dynamic spine stabilizer

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/70 (2006.01)

Patent

CA 2608427

A dynamic spine stabilization device is provided that includes at least one force imparting member, e.g., a spring. The force imparting member is adapted to deliver a force of between about 150 lb/inch and 450 lbs/inch, and restrict the relative travel distance between said first and second pedicles to a distance of between about 1.5mm and 5mm. The spinal stabilization devices also have a minimal impact on the location of the center of rotation for the spinal segment being treated. By providing resistance in the noted range and restricting the travel distance to the noted range, it has been found that the stabilization device provides a desired level of stabilization, as reflected by range of motion values that closely approximate pre-injury range of motion levels. In addition, the resistance levels are not so high as to alter the location of the center of rotation of the treated spinal segment from its normal anatomical location to levels previously obtained, thereby permitting substantially unimpeded angular motion despite the posterior presence of a stabilization device.

La présente invention concerne un dispositif de stabilisation dynamique du rachis qui comprend au moins un élément applicateur de force, tel qu'un ressort. L'élément applicateur de force est prévu pour appliquer une force comprise entre environ 150 livres/pouce et 450 livres/pouce et pour réduire la distance de parcours relatif entre les premier et deuxième pédicules à une distance comprise entre environ 1,5 mm et 5 mm. Les dispositifs de stabilisation du rachis ont également un impact minimal sur la position du centre de rotation pour le segment spinal qui est traité. Le fait d'apporter une résistance dans la plage indiquée et de réduire la distance de parcours jusqu'à la plage indiquée a permis de remarquer que le dispositif de stabilisation assure un niveau de stabilisation désiré, comme l'indique la plage des valeurs de déplacement qui se rapprochent de très près de la plage des niveaux de déplacement avant la blessure. De plus, les niveaux de résistance ne sont pas suffisamment élevés pour affecter la position du centre de rotation du segment spinal traité entre sa position anatomique normale et les niveaux atteints au préalable, ce qui permet d'assurer un mouvement angulaire sensiblement non entravé malgré la présence postérieure d'un dispositif de stabilisation.

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