To avoid traditional muscle dissection required in the placement of a screw for a pedicle screw fixation, a retractor is provided having a guide of an appropriate length to provide access from the skin surface to the dorsal aspect of the vertebra over the pedicle. The retractor has a handle to provide...http://www.google.es/patents/US6951538?utm_source=gb-gplus-sharePatente US6951538 - Retractor and method for spinal pedicle screw placement
Retractor and method for spinal pedicle screw placement
