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Extravasation detector

  • US 7,801,583 B2
  • Filed: 12/10/2003
  • Issued: 09/21/2010
  • Est. Priority Date: 12/10/2002
  • Status: Active Grant
First Claim
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1. A method of detecting extravasation during a procedure infusing a substance into a blood vessel, comprising the steps of infusing a substance into the blood vessel;

  • generating a first signal proportional to a flow velocity within the blood vessel downstream of the point of infusion, at a first time;

    generating a second signal proportional to the flow velocity within the blood vessel downstream of the point of infusion, at a second time;

    generating a third signal representing an increase in flow velocity, based on the first and second signals; and

    generating a fourth signal indicating extravasation if an increase in flow velocity represented by the third signal is less than a threshold value.

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