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US 2021/0275819 A1Published application
Diagnostic circuitry for monitoring charge states of electrodes of a lead system associated with an implantable pulse generator
AssigneeAdvanced Neuromodulation Systems, Inc.
InventorsSteven Boor, Daran Deshazo
Life of this patent
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Abstract
A system and method for measuring and monitoring charge states of one or more electrodes of an implanted stimulation lead system associated with an IPG. A Kelvin connection scheme operative with a switching circuit is provided for coupling select electrode terminals disposed in a Kelvin connection measurement loop in a switchable manner to sense and reference inputs of an analog-to-digital converter (ADC) configured as at least part of diagnostic circuitry for the IPG.
Claims17
An implantable medical device, comprising:
- a power supply module;
- a processing unit;
- a pulse generator;
- an implantable lead system including at least one lead having a plurality of electrodes adapted to stimulate a patient's tissue responsive to instructions generated by the processing unit in association with the pulse generator, the plurality of electrodes including at least one inactive electrode and at least one active electrode;
- diagnostic circuitry comprising an analog-to-digital converter (ADC) having a sense input and a reference input;
- and
- switching circuitry operative to selectively couple one or more terminals associated with each electrode to the ADC of the diagnostic circuitry, the switching circuitry including one or more switches for each electrode corresponding to the one or more terminals associated therewith,
- wherein the diagnostic circuitry is configured to perform following acts in conjunction with the switching circuitry and the processing unit:
- utilize one of a direct current (DC) blocking stimulation capacitor (CDC) terminal and an alternating current (AC) coupling sense capacitor (CSENSE) terminal of the at least one inactive electrode of the implantable lead system as a first Kelvin connection terminal switchably coupled by the switching circuitry to the reference input of the ADC for a voltage measurement with respect to a second active electrode of the implantable lead system;
- utilize an AC coupling sense capacitor (CSENSE) terminal or a DC blocking stimulation capacitor (CDC) terminal of the second active electrode switchably coupled by the switching circuitry as a second Kelvin connection terminal to the sense input of the ADC for the voltage measurement;
- and
- obtain the voltage measurement across the first and second Kelvin connection terminals as a voltage indicative of a charge state accumulated across at least one of a CDC capacitor coupled to the second active electrode and a double-layer (DL) capacitance (CDL) associated with an electrode/tissue interface (ETI) of the second active electrode.
9 more elements
A method of operating an implantable medical device having a pulse generator configured to supply stimulation to a patient's tissue for therapy, the method comprising:
- configuring a plurality of electrodes of an implantable lead system of the implantable medical device as at least one active electrode and at least one inactive electrode;
- switchably coupling one of a direct current (DC) blocking stimulation capacitor (CDC) terminal and an alternating current (AC) coupling sense capacitor (CSENSE) terminal of the at least one inactive electrode of the implantable lead system as a first Kelvin connection terminal to a reference input of an analog-to-digital converter (ADC) forming diagnostic circuitry for a voltage measurement with respect to a second active electrode of the implantable lead system;
- switchably coupling an AC coupling sense capacitor (CSENSE) terminal or a DC blocking stimulation capacitor (CDC) terminal of the second active electrode as a second Kelvin connection terminal to a sense input of the ADC for the voltage measurement;
- and
- obtaining the voltage measurement across the first and second Kelvin connection terminals as a voltage indicative of a charge state accumulated across at least one of a CDC capacitor coupled to the second active electrode and a double-layer (DL) capacitance (CDL) associated with an electrode/tissue interface (ETI) of the second active electrode.
2 more elements
A biostimulation system, comprising:
- an implantable medical device (IMD) including:
- a power supply module;
- a processing unit;
- a pulse generator;
- an implantable lead system including at least one lead having a plurality of electrodes adapted to stimulate a patient's tissue responsive to instructions generated by the processing unit in association with the pulse generator;
- diagnostic circuitry comprising an analog-to-digital converter (ADC) having a sense input and a reference input;
- and
- switching circuitry operative to selectively couple one or more terminals associated with each electrode to the ADC of the diagnostic circuitry, the switching circuitry including one or more switches for each electrode corresponding to the one or more terminals associated therewith;
- and
- an external programmer device disposed in a communicative relationship with the IMD, the external programmer device having a processor operative to execute program instructions responsive to user input, the program instructions for selectively actuating the switching circuitry of the IMD based on a selection of a particular Kelvin connection mode with respect to an active electrode and a Kelvin electrode, wherein the switching circuitry couples a terminal of the active electrode and a terminal of the Kelvin electrode, respectively, to the sense input and the reference input of the ADC for obtaining a voltage measurement indicative of a charge state associated with the active electrode.
7 more elements
Dependencies are inferred from the claim text.