| US 7,462,163 B2 | ||
| System and method for blockage detection for medication infusion | ||
| Marc Yap, Millville, Utah (US); Sean B. Cahill, Temecula, Calif. (US); Jeffery T. Mason, Escondido, Calif. (US); Elizabeth A. Paderi, La Jolla, Calif. (US); and Byron Hourmand, Vista, Calif. (US) | ||
| Assigned to LMA North America, Inc., San Diego, Calif. (US) | ||
| Filed on Jul. 30, 2004, as Appl. No. 10/903,951. | ||
| Application 10/903951 is a continuation in part of application No. 10/218106, filed on Aug. 12, 2002, granted, now 6,893,414. | ||
| Prior Publication US 2007/0078381 A1, Apr. 05, 2007 | ||
| Int. Cl. A61M 5/30 (2006.01); A61M 37/00 (2006.01) | ||
| U.S. Cl. 604—67 [604/131] | 37 Claims |
| 1. 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.
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