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Implantable medication infusion pump including self-contained acoustic fault detection apparatus

  • US 5,328,460 A
  • Filed: 06/11/1993
  • Issued: 07/12/1994
  • Est. Priority Date: 06/21/1991
  • Status: Expired due to Term
First Claim
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1. An implantable medication infusion pump including apparatus for diagnosing a system malfunction, comprising:

  • a reservoir for containing a fluid medication;

    means for transferring said fluid medication from said reservoir to a location outside said implantable medication infusion pump;

    means located in said implantable medication infusion pump adjacent to said transferring means for generating electrical signals proportional to acoustic signals generated by said transferring means;

    means for processing said electrical signals to produce processed electrical signals;

    logic means for utilizing a characteristic related to the relative amplitude of said processed electrical signals to determine the operational condition of the implanted medication infusion pump, said logic means providing a first informational signal if said processed electrical signals are greater than or equal to a first predetermined value, said logic means providing a second informational signal if said processed electrical signals are smaller than or equal to a second predetermined value, said second predetermined value being smaller than said first predetermined value; and

    means for providing an informational signal if said logic means determines the existence of a system malfunction.

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