Patent ID: 7462163

Claim:
A system for percutaneous infusion of an internal wound site, the system comprising: a first reservoir shaped to contain a first fluid; a tube having a preferentially distendable portion formed of a single material, wherein at the preferentially distendable portion, distention of a diameter of the tube in response to blockage of the tube is amplified, the preferentially distendable portion having a noncircular cross sectional shape in the absence of blockage of the tube; a motor operable to urge the first fluid toward the internal wound site via the tube; and a blockage sensor comprising a first conductor in direct contact with the exterior of the tube and a second conductor, wherein at least one of the first and second conductors is configured to be urged into contact with the other to form a switch, the switch configured to be actuated between an open circuit condition and a closed circuit condition in response to direct receipt of mechanical force exerted by distention of the tube; wherein the switch is operable without the preferentially distendable portion being fully surrounded.