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Method for generating a signal corresponding to the respiration volume per unit of time of a patient

  • US 5,355,894 A
  • Filed: 08/23/1993
  • Issued: 10/18/1994
  • Est. Priority Date: 08/26/1992
  • Status: Expired due to Term
First Claim
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1. A method for generating a signal corresponding to the respiration volume per unit of time of a patient, comprising the steps of:

  • acquiring a measured impedance signal from an impedance measuring system including an electrode arrangement disposed in a region of the heart of said patient;

    filtering a signal component out of said measured impedance signal correlated with the respiration of the patient, said signal component having a plurality of zero-axis crossings;

    detecting said zero-axis crossings of said signal component;

    identifying a maximum amplitude value of said signal component between each of two successive pairs of zero-axis crossings; and

    forming a continuously updated average of said maximum amplitude value over a predetermined time interval, said average corresponding to the respiration volume per unit of time of said patient.

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