Impedance measurement for an implantable device

a technology of implantable devices and impedance characteristics, which is applied in the field of implantable medical devices, can solve the problems of complex custom integrated circuits, high cost, and specific to intended use, and the measured battery characteristics do not have monotonically changing values with respect to remaining charge, and the present status of the battery cannot be accurately and unambiguously determined from the measured battery characteristi

Inactive Publication Date: 2006-02-02
LIVANOVA USA INC
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Problems solved by technology

Many types of implantable medical devices, such as pacemakers and drug infusion pumps, typically include custom integrated circuits that are complex, expensive, and specific to the intended use.
One problem associated with these methodologies is that, for many battery chemistries, these measured battery characteristics do not have monotonically-changing values with respect to remaining charge.
For example, lithium/carbon monofluoride (Li/CFx) cells commonly used in neurostimulators and other IMDs have a relatively flat voltage discharge curve for the majority of their charge life, and present status of the battery cannot be accurately and unambiguously determined from a measured battery characteristic.
Another problem associated with this methodology is the variability of current consumpti...

Method used

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  • Impedance measurement for an implantable device
  • Impedance measurement for an implantable device
  • Impedance measurement for an implantable device

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Embodiment Construction

[0040] Illustrative embodiments of the invention are described herein. In the interest of clarity, not all features of an actual implementation are described in this specification. In the development of any such actual embodiment, numerous implementation-specific decisions must be made to achieve the design-specific goals, which will vary from one implementation to another. It will be appreciated that such a development effort, while possibly complex and time-consuming, would nevertheless be a routine undertaking for persons of ordinary skill in the art having the benefit of this disclosure.

[0041] Embodiments of the present invention provide methods and apparatus for monitoring and / or estimating the electrical charge depletion of an implantable medical device (IMD). Estimating battery life may be based upon estimated future charge depletion and actual past charge depletion. Embodiments of the present invention provide for an elective replacement indicator (ERI) signal to provide a ...

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Abstract

A method and an apparatus for determining an impedance experienced by a lead associated with the implantable device. A substantially constant current signal is provided through a first terminal and a second terminal of the lead. A voltage across the first and second terminals is measured. An impedance across the first and second terminals is determined based upon the constant current signal and the measured voltage.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates generally to implantable medical devices, and more particularly to methods, apparatus, and systems for monitoring power consumption and impedance characteristics relating to implantable medical devices. [0003] 2. Description of the Related Art [0004] There have been many improvements over the last several decades in medical treatments for disorders of the nervous system, such as epilepsy and other motor disorders, and abnormal neural discharge disorders. One of the more recently available treatments involves the application of an electrical signal to reduce various symptoms or effects caused by such neural disorders. For example, electrical signals have been successfully applied at strategic locations in the human body to provide various benefits, including reducing occurrences of seizures and / or improving or ameliorating other conditions. A particular example of such a treatment regimen invol...

Claims

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Application Information

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IPC IPC(8): A61N1/18
CPCA61N1/3708G01R31/3662A61N2001/083G01R31/389
Inventor ARMSTRONG, RANDOLPH K.ARMSTRONG, SCOTT A.
Owner LIVANOVA USA INC
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