Methods and devices for illuminating a surgical space during surgery in a patient are provided. A retractor provides a working path for access to a location in the patient. A light instrument is positionable in working channel to emit light at the surgical space without substantially obstructing access...http://www.google.de/patents/US20040143169?utm_source=gb-gplus-sharePatent US20040143169 - Systems and techniques for illuminating a surgical space
