Implanted Lead System Kelvin Connection for Electrode Dissolution
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Solution Overview
Problem
Advanced physiological engineering research faces challenges in monitoring the status of electrodes in chronically implantable electrical stimulation mechanisms due to electrode dissolution and structural damage from exposure to high electrode potentials, especially with large electrode arrays, and existing IPG systems lack effective diagnostic methods for optimizing therapy settings and ensuring patient safety.
Innovation Solution
The implementation of a system and method using Kelvin connection schemes for diagnostic voltage measurements and electrical load parametric characterization at the electrode/tissue interface, allowing for real-time monitoring and adjustment of stimulation therapy settings through a ramping sequence, which involves incremental changes in stimulation parameters to determine bulk patient resistance, capacitance, and Faradaic resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode arrays are used for stimulation therapy, then therapy effectiveness is improved, but electrode dissolution and structural damage occur due to exposure to high potentials
Solution Approach 1:
The system performs preliminary diagnostic measurements before full therapy delivery to characterize the electrode/tissue interface electrical loads. By measuring bulk resistance, capacitance, and Faradaic resistance in advance, the system can predict safe stimulation parameters that avoid harmful electrode potentials while maintaining therapy effectiveness.
Solution Approach 2:
The system continuously monitors electrical load parameters at the electrode/tissue interface and uses this feedback to adjust stimulation settings in real-time. This closed-loop control prevents electrode dissolution and structural damage by keeping potentials within safe ranges while maintaining effective therapy delivery.
2Reliability
If diagnostic methods are added to IPG systems, then patient safety and therapy optimization are improved, but device complexity increases
Solution Approach 1:
The IPG system is designed to perform multiple functions using the same hardware infrastructure. The pulse generation circuitry and measurement circuitry share common components, allowing the system to both deliver therapy and perform diagnostic measurements without requiring entirely separate dedicated hardware for each function.
Solution Approach 2:
The system performs self-diagnosis by automatically measuring its own electrical load parameters at the electrode/tissue interface. The IPG characterizes its own operational environment and adjusts its own settings, eliminating the need for external diagnostic equipment or manual testing procedures.
3Productivity
If electrical load parameters are measured at electrode/tissue interface, then real-time monitoring capability is improved, but measurement precision is challenged by tissue variability
Solution Approach 1:
The system measures multiple electrical load parameters (bulk resistance, capacitance, Faradaic resistance) rather than relying on a single measurement. By characterizing the complete electrical impedance spectrum, the system achieves more accurate and reliable tissue characterization that compensates for tissue variability and provides robust real-time monitoring.
Data Source
AI summary
A system and method for extracting ETI load parametric data relative to one or more electrodes of an implanted stimulation lead system associated with an IPG. A Kelvin connection scheme is provided for measuring induced voltages present at stimulated electrodes during a stimulation ramping sequence, which may be used for determining the ETI parametric data using a number of techniques, including, without limitation, a waveform analysis.