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System and method to monitor the heart of a patient

  • US 5,743,267 A
  • Filed: 10/27/1995
  • Issued: 04/28/1998
  • Est. Priority Date: 10/19/1995
  • Status: Expired due to Term
First Claim
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1. A system used to monitor a patient'"'"'s heart, the system comprising:

  • a measuring device configured to measure the absolute blood pressure of the patient and to generate an absolute blood pressure signal; and

    a processing element configured to be coupled to receive the absolute blood pressure signal, the processing element being further configured to generate a filtered blood pressure signal from the absolute blood pressure signal by substantially removing variations from the absolute blood pressure signal caused by the respiratory activity of the patient, the processing element further including;

    a filtering element further including a sampling element configured to sample the absolute blood pressure signal during a plurality of selected heart cycles that occur over a course of a plurality of respiratory cycles of the patient, the plurality of selected heart cycles being selected at approximately the same phase during each of the plurality of respiratory cycles respectively;

    an averaging element configured to generate the filtered blood pressure signal by averaging the absolute blood pressure signal measured during the plurality of selected heart cycles; and

    a computation element configured to generate a set of parameters derived from the filtered blood pressure signal which are indicative of the condition of the patient.

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