Minimally invasive methods and devices for introducing a spinal fixation element into a surgical site in a patient's spinal column are provided. In one embodiment, a dissection tool is provided for separating muscles along a muscle plane without causing damage to the muscles. The dissection tool can...http://www.google.ca/patents/US20050154389?utm_source=gb-gplus-sharePatent US20050154389 - METHODS AND DEVICES FOR MINIMALLY INVASIVE SPINAL FIXATION ELEMENT PLACEMENT
