A bi-directional endoscope comprising a catheter body having a tubular spring frame attached to and extending axially from the distal end thereof. The spring frame comprises a spring body which includes a tip member positioned on the distal end thereof, and a plurality of relief slots disposed therein...http://www.google.es/patents/US5381782?utm_source=gb-gplus-sharePatente US5381782 - Bi-directional and multi-directional miniscopes
