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Tissue characterization using intracardiac impedances with an implantable lead system

  • US 8,065,005 B1
  • Filed: 03/12/2007
  • Issued: 11/22/2011
  • Est. Priority Date: 03/31/2006
  • Status: Active Grant
First Claim
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1. An implantable device, comprising:

  • one or more electrodes for implanting in contact with a bodily tissue;

    a pulse generator configured to produce pulses that are applied to the bodily tissue, wherein the pulses are used to measure a physiological parameter, and the pulses are applied via the one or more electrodes;

    wherein each pulse has a multi-phasic waveform consisting of positive phases and negative phases;

    wherein each phase comprises a duration and an amplitude, wherein duration is defined as the width of the phase and the amplitude is defined as the length of the phase, further wherein the alternating positive and negative phases have different absolute amplitudes; and

    wherein each pulse has a duration less than a charging time constant of an electrode-electrolyte interface between the electrode and the bodily tissue.

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