Apparatus (10) is provided for use with a biologically-compatible-fluid pressure source (16), the apparatus (10) including an elongate carrier (26), adapted to be inserted through a proximal opening (18) of a body lumen (20), and a piston head (30) coupled to a distal portion of the carrier (26). The...http://www.google.com/patents/US7947013?utm_source=gb-gplus-sharePatent US7947013 - Pressure-propelled system for body lumen
