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Sensing rate of change of pressure in the left ventricle with an implanted device

  • US 7,670,298 B2
  • Filed: 06/01/2005
  • Issued: 03/02/2010
  • Est. Priority Date: 06/01/2005
  • Status: Active Grant
First Claim
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1. An implantable device comprising:

  • a transducer that converts heart sounds into an electrical signal;

    a control circuit coupled to the transducer, the control circuit configured to receive the electrical signal, identify an S1 heart sound, convert the S1 heart sound into morphological data comprising a maximum S1 amplitude and a minimum S1 amplitude, and determine and provide, to a user or automated process, a patient status indicator based on an indication of a peak-to-peak difference between the maximum S1 amplitude and the minimum S1 amplitude, wherein the patient status indicator is correlative to at least one of contractility or a maximum time rate of change of pressure within a ventricle of a heart during a cardiac cycle; and

    a housing enclosing the control circuit, the housing defining a volume coextensive with an outer surface of the housing;

    wherein the transducer is located in a region in or on the housing.

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