An object of the present invention is to provide an interspinous spacer which can be reliably held between adjacent spinous processes to maintain an appropriate space between the adjacent spinous processes, and in particular to provide an interspinous spacer which allows a less invasive operation to...http://www.google.fr/patents/US20070149972?utm_source=gb-gplus-shareBrevet US20070149972 - Interspinous spacer
