A supplemental spine fixation device and method is used in association with a primary spine fixation device. The supplemental spine fixation device includes a guide and spacer for distracting apart adjacent spinous processes and the device has hook members which hook about the first and second spinous...http://www.google.com.hk/patents/US20070055246?utm_source=gb-gplus-share專利 US20070055246 - Spine distraction implant and method
