Method and apparatus for detection of lead conductor anomalies using dynamic electrical parameters
First Claim
1. A method for determination of anomalies in an implanted lead within a patient, the method comprising the steps of:
- a. delivering one or more signals at a subset of frequencies to one or more conductors in the implanted lead,b. measuring two or more parameters determined by the inductance or capacitance of the one or more conductors in response to a transmitted signal, the two or more measured parameters selected from the group consisting of;
complex impedance including real and imaginary components, admittance, susceptance, resonance frequency, and phase angle,c. determining at least one relationship between the two or more measured parameters,d. comparing the at least one relationship to a predetermined expected range of relationships, ande. detecting an anomaly based on a change between the determined and expected relationships,wherein the anomaly can be any of a partial conductor fracture or a complete conductor fracture, or a partial insulation failure or a complete insulation failure.
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Abstract
A method and apparatus to detect anomalies in the conductors of leads attached to implantable medical devices based on the dynamical electrical changes these anomalies cause. In one embodiment, impedance is measured for weak input signals of different applied frequencies, and a conductor anomaly is detected based on differences in impedance measured at different frequencies. In another embodiment, a transient input signal is applied to the conductor, and an anomaly is identified based on parameters related to the time course of the voltage or current response, which is altered by anomaly-related changes in capacitance and inductance, even if resistance is unchanged. The method may be implemented in the implantable medical device or in a programmer used for testing leads.
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Citations
20 Claims
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1. A method for determination of anomalies in an implanted lead within a patient, the method comprising the steps of:
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a. delivering one or more signals at a subset of frequencies to one or more conductors in the implanted lead, b. measuring two or more parameters determined by the inductance or capacitance of the one or more conductors in response to a transmitted signal, the two or more measured parameters selected from the group consisting of;
complex impedance including real and imaginary components, admittance, susceptance, resonance frequency, and phase angle,c. determining at least one relationship between the two or more measured parameters, d. comparing the at least one relationship to a predetermined expected range of relationships, and e. detecting an anomaly based on a change between the determined and expected relationships, wherein the anomaly can be any of a partial conductor fracture or a complete conductor fracture, or a partial insulation failure or a complete insulation failure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification