Method and System for Controlling Electrical Conditions of Tissue II

a technology of electrical conditions and tissue, applied in the field of tissue electrical conditions control, can solve the problems of difficult task, presenting a significant obstacle to isolating the cap of interest, and the precise mechanisms involved are poorly understood, so as to reduce the complexity of the measurement signal chain, reduce the interaction, and reduce the effect of artefa

a technology of electrical conditions and tissue, applied in the field of tissue electrical conditions control, can solve the problems of difficult task, presenting a significant obstacle to isolating the cap of interest, and the precise mechanisms involved are poorly understood, so as to reduce the complexity of the measurement signal chain, reduce the interaction, and reduce the effect of artefa

US20150282725A1Inactive Publication Date: 2015-10-08SALUDA MEDICAL PTY LTD
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  • Method and System for Controlling Electrical Conditions of Tissue II
  • Method and System for Controlling Electrical Conditions of Tissue II
  • Method and System for Controlling Electrical Conditions of Tissue II

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Embodiment Construction

[0050]FIG. 1 illustrates an implantable device 100 suitable for implementing the present invention. Device 100 comprises an implanted control unit 110, which controls application of a sequence of neural stimuli. In this embodiment the unit 110 is also configured to control a measurement process for obtaining a measurement of a neural response evoked by a single stimulus delivered by one or more of the electrodes 122. Device 100 further comprises an electrode array 120 consisting of a three by eight array of electrodes 122, each of which may be selectively used as the stimulus electrode, sense electrode, compensation electrode or sense electrode.

[0051]FIG. 2 shows the currents and voltages that contribute to spinal cord potential (SCP) measurements in a typical system of the type shown in FIG. 3. These signals include the stimulus current 202 applied by two stimulus electrodes, which is a charge-balanced biphasic pulse to avoid net charge transfer to or from the tissue and to provide...

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Abstract

A method for controlling electrical conditions of tissue in relation to a current stimulus. A first current produced by a first current source is delivered to the tissue via a current injection electrode. A second current drawn by a second current source is extracted from the tissue via a current extraction electrode. The second current source is matched with the first current source so as to balance the first current and the second current. A ground electrode which is proximal to the current injection electrode and the current extraction electrode is grounded, to provide a ground path for any mismatch current between the first current and second current. A response of the tissue to the current stimulus is measured via at least one measurement electrode.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of Australian Provisional Patent Application No. 2012904838 filed 6 Nov. 2012, which is incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to controlling the electrical conditions of tissue, for example for use in suppressing artefact to enable improved measurement of a response to a stimulus, such as measurement of a compound action potential by using one or more electrodes implanted proximal to a neural pathway.BACKGROUND OF THE INVENTION[0003]Neuromodulation is used to treat a variety of disorders including chronic pain, Parkinson's disease, and migraine. A neuromodulation system applies an electrical pulse to tissue in order to generate a therapeutic effect. When used to relieve chronic pain, the electrical pulse is applied to the dorsal column (DC) of the spinal cord or dorsal root ganglion (DRG). Such a system typically comprises an implanted electrical pulse gener...

Claims

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Application Information

Patent Timeline
08 Oct 2015
Publication
US20150282725A1
IPC
A61B5/04
CPC
A61B2562/0209; A61B5/04001; A61B5/7217; A61N1/36125; A61N1/36142; A61B5/30; A61B5/24
Inventors
SINGLE, PETER SCOTT VALLACK