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System and method for blockage detection for medication infusion

  • US 7,462,163 B2
  • Filed: 07/30/2004
  • Issued: 12/09/2008
  • Est. Priority Date: 08/12/2002
  • Status: Expired due to Fees
First Claim
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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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