An intervertebral distraction tool has a clamshell head with upper and lower halves, each having a curvate outer surface and a flat inner surface. The distal side of the head is hinged so that the head opens and closes from the proximal side of the head. The hinge is a separating hinge that allows the...http://www.google.ca/patents/US6669699?utm_source=gb-gplus-sharePatent US6669699 - Distraction instrument for use in anterior cervical fixation surgery
