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Medical lead impedance measurement system

  • US 5,201,865 A
  • Filed: 10/28/1991
  • Issued: 04/13/1993
  • Est. Priority Date: 10/28/1991
  • Status: Expired due to Fees
First Claim
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1. A method of measuring the impedance of an implantable medical lead having an unknown impedance, comprising:

  • a. Coupling said implantable lead to a pulse generator which includes an output capacitor and a precision resistor having a known resistance;

    b. Charging said output capacitor to a first predetermined voltage, discharging said output capacitor through said precision resistor and measuring the time interval during the discharge of said output capacitor from said first predetermined voltage to a second predetermined voltage;

    c. Charging said output capacitor to said first predetermined voltage, discharging said output capacitor through said lead and measuring the time interval during discharge of said output capacitor from said first predetermined voltage to said second predetermined voltage; and

    d. Determining the ratio of said measured time interval during discharge of said output capacitor through said lead impedance to said measured time interval during discharge of said output capacitor through said precision resistor and multiplying said ratio by said known resistance of said precision resistor to provide a measurement of the impedance of said lead.

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