Devices and methods are disclosed for expanding a spinal canal. An implantable device having a shaft with a first cross-sectional dimension distinct from a second cross-sectional dimension can be inserted into an opening in a lamina and rotated 90 degrees to hinge the lamina away from the spinal canal....http://www.google.fr/patents/US20100161056?utm_source=gb-gplus-shareBrevet US20100161056 - METHODS AND DEVICES FOR EXPANDING A SPINAL CANAL
Numéro de demande: 12/339,503 Numéro de publication: US 2010/0161056 A1 Date de dépôt: 19 déc. 2008 Brevet délivré: US8133280 ( Date de délivrance 13 mars 2012)
