Patent ID: 8419678

Claim:
Apparatus for use with a biologically-compatible-fluid pressure source, comprising: a guide member at least partially insertable into a proximal opening of a body lumen; said guide member including a passageway connectable to the source of fluid pressure; an elongate carrier arranged for sliding movement through said guide member, adapted to be inserted through a proximal opening of a body lumen; and a piston head coupled to a distal portion of the carrier and adapted to: be inflated until it is in contact with the body lumen forming a pressure seal between said piston head and a wall of the lumen after the carrier has been inserted into the lumen, such that once the piston head is inflated it is configured to be withdrawn proximally through the body lumen in response to pressure from the fluid pressure source to an external surface of the distal piston head, creating greater fluid pressure acting on the distal side of piston head than on the proximal side of piston head, thereby proximally propelling the piston head and the carrier.