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Rate responsive active implantable medical device such as a pacemaker, defibrillator and/or cardiovertor, including the multisite type

  • US 6,246,910 B1
  • Filed: 06/23/1999
  • Issued: 06/12/2001
  • Est. Priority Date: 06/26/1998
  • Status: Expired due to Term
First Claim
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1. A rate responsive active implantable medical device for use in a patient, comprising:

  • at least one effort sensor operable to measure a predominantly physiological parameter of a patient and having an output signal corresponding to an effort level of the patient;

    at least one activity sensor operable to measure a predominantly physical parameter of patient and having an output signal corresponding to an activity level of the patient;

    means for analyzing the at least one effort sensor output signal and the at least one activity sensor output signal, said means comprising;

    means for periodically measuring said at least one effort sensor output signal and at least one activity sensor output signal and determining therefrom couples of values, each said couple of value corresponding to a given level of effort and activity developed by the patient at said measurement;

    means for establishing a characteristic function of said determined couples of value for a first time period;

    means for comparing an established characteristic function corresponding to a time period to a subsequent established characteristic function corresponding to a subsequent time period;

    means for determining whether there is an evolution of said established characteristic function in response to at least one of said comparisons of an established characteristic function to a subsequent established characteristic function; and

    means for determining a degree of deterioration of the patient in response to said evolution of said established characteristic function.

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