A polyaxial drill guide includes a body, a collet and a stem. The collet includes a collet shaft having distal and proximal ends and a longitudinal bore. The body includes a conical bore having narrow and wide ends. The distal end of the collet shaft rotatably mounts within the narrow end of the conical...http://www.google.ca/patents/US20030083667?utm_source=gb-gplus-sharePatent US20030083667 - Polyaxial drill guide
