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Bioimpedance-assisted placement of a medical device

  • US 9,415,188 B2
  • Filed: 07/31/2014
  • Issued: 08/16/2016
  • Est. Priority Date: 10/29/2010
  • Status: Active Grant
First Claim
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1. A catheter guidance system, comprising:

  • a catheter for disposal within a vessel of a patient, the catheter defining at least one lumen through which a fluid may be infused into the vessel;

    a radiofrequency (RF) source for providing an electrical current;

    at least one electrode pair included proximate a distal tip of the catheter to which the electrical current is provided;

    a voltage measuring device to measure voltage values across the at least one electrode pair when the electrical current is provided to the electrode pair;

    a processor for determining the proximity of the distal tip of the catheter to a target destination, the processor;

    calculating a first impedance value based on intravascular detection of at least one electrical property being a measured characteristic of a first tissue surface of the vessel, the at least one electrical property detected across the at least one electrode pair;

    calculating a second impedance value based on intravascular detection across the at least one electrode pair of at least one electrical property being a measured characteristic of a second tissue surface of the vessel; and

    determining the proximity of the distal end of the catheter to the target destination from a relative variance between the first impedance value and the second impedance value; and

    a display for depicting data relating to the first and second impedance values.

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