A camera assembly for positioning within a bodily passageway, including a camera, a catheter adapted to retain the camera, and a rotary coupling interconnecting the catheter and the camera. The catheter is provided with helically-wound threads thereon. The rotary coupling permits the catheter to rotate...http://www.google.es/patents/US7780650?utm_source=gb-gplus-sharePatente US7780650 - Rotate-to-advance catheterization system
