This document discusses trajectory guides that include an instrument guide with at least one lumen angled with respect to an orthogonal or other through-axis. In one example, patterned lumens on the instrument guide provide a mirror image pattern of trajectory axes intersecting a target plane. In another...http://www.google.fr/patents/US7658879?utm_source=gb-gplus-shareBrevet US7658879 - Trajectory guide with angled or patterned guide lumens or height adjustment
Trajectory guide with angled or patterned guide lumens or height adjustment
