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Implantable medical device for measuring time varying physiologic conditions especially edema and for responding thereto

  • US 6,512,949 B1
  • Filed: 07/12/1999
  • Issued: 01/28/2003
  • Est. Priority Date: 07/12/1999
  • Status: Expired due to Term
First Claim
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1. Implantable medical device for detection of impedance measurement in a region of a living body'"'"'s tissue and for reacting to a predetermined level of edema in said region, comprisinf:

  • a plurality of electrodes, each adapted to be exposed to the body;

    electrical energy pulse delivery means coupled to at least one of said plurality of electrodes for creating an electric field in the body;

    energy measurement means for obtaining impedance measurements in the electrical field in the body;

    a timing circuit coupled to the energy measurement means to time the measurement of impedance to coincide with delivery of said energy pulse;

    a memory circuit to store a value representative of a dc value of said measured impedance at an instant in time;

    a dc sampling offset circuit to determine a dc offset value of a next measurement of said impedance and connected to provide a dc offset value signal to said memory circuit;

    an edema valuation and output circuit coupled to said memory circuit to generate output signals indicative of a level of edema related to the the value stored in the memory circuit and to the dc offset value;

    wherein said memory circuit stores either said dc offset values of said dc values or both, over a period of more than a day, and therapy delivery apparatus responsive to predetermined levels of said output signals when said output signals indicative of a level of edema match a predetermined level of edema value stored by said therapy delivery apparatus.

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