Daisy-Chained Electrode Driver ICs for Neurostimulator Voltage Monitoring
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Solution Overview
Problem
Implantable neurostimulator systems face challenges in efficiently managing and synchronizing the stimulation pulses across multiple electrode-driver integrated circuits, leading to potential charge imbalances and inefficiencies in therapy delivery.
Innovation Solution
The implementation of a daisy-chained architecture using two identical electrode-driver ICs, where one IC acts as a master and the other as a slave, connected via a centralized bus with additional control signals, allows for simultaneous pulse delivery and voltage monitoring across 32 electrodes, ensuring synchronized therapeutic pulses and efficient power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple electrode-driver ICs are used to increase electrode capacity, then the number of electrodes is improved, but charge imbalance and synchronization issues occur
Solution Approach 1:
The system divides the electrode-driver functionality into multiple independent ICs (master and slave), each capable of driving a subset of electrodes. This segmentation allows the system to scale electrode capacity while maintaining independent control over charge balance for each IC through separate monitoring circuits.
Solution Approach 2:
The patent implements voltage monitoring circuits that continuously measure electrode voltages and provide feedback to the control logic. This feedback mechanism enables real-time detection of charge imbalances and allows the system to adjust stimulation parameters to maintain charge balance across all electrodes driven by multiple ICs.
2Quantity of substance
If multiple electrode-driver ICs are used to increase electrode capacity, then the number of electrodes is improved, but synchronization of pulses deteriorates
Solution Approach 1:
The patent merges the clocking systems of multiple electrode-driver ICs by providing a common clock signal to all ICs. This unified timing reference ensures that stimulation pulses are issued simultaneously across all ICs, eliminating synchronization delays and ensuring coordinated therapy delivery.
Solution Approach 2:
The control logic is designed to universally manage multiple electrode-driver ICs through a standardized interface and common clock signal. This universal control mechanism allows the same timing and control architecture to scale from one IC to multiple ICs without compromising pulse synchronization.
3Reliability
If all clock signals remain active in multi-IC system, then operational readiness is improved, but power consumption increases
Solution Approach 1:
The system dynamically controls clock signal distribution based on operational requirements. The control logic can selectively enable or disable clock signals to specific electrode-driver ICs depending on which electrodes are currently active, allowing the system to maintain operational readiness for all electrodes while minimizing power consumption by keeping clocks inactive for idle ICs.
Data Source
AI summary
Electrode voltage monitoring circuitry for an implantable neurostimulator system having a plurality of electrode-driver integrated circuits (ICs) in provided. Electrodes from either or both ICs can be chosen to provide stimulation, and one of the IC acts as the master while the other acts as the slave. Electrodes voltages on the slave IC are routed to the master IC, and thus the master IC can monitor both electrode voltages on the slave as well as electrode voltages on the master. Such voltages can be monitored for a variety of purposes, and in particular use of such voltage is disclosed for determining the resistance between electrodes and to set a compliance voltage for stimulation.