Neurostimulation Electrode Distance Analysis
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Solution Overview
Problem
Existing neurostimulation systems face challenges in accurately determining the distances between stimulation and sensing electrodes and the neural target, leading to potential misadjustments of stimulation parameters due to body movements or electrode displacement.
Innovation Solution
The system performs an electrode distance test by sensing neural signals using both stimulation and sensing electrodes, analyzing the stimulation distance and sensing distance using these signals, and adjusting the control of neurostimulation delivery based on the analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the system uses a single electrode for both stimulation and sensing, then the device complexity is reduced, but the measurement precision of electrode distances deteriorates
Solution Approach 1:
The patent segments the electrode functions by using separate stimulation electrodes and sensing electrodes. The stimulation electrode delivers neurostimulation pulses while the sensing electrode detects neural signals, allowing independent optimization of each function and precise measurement of respective distances to the neural target
Solution Approach 2:
The patent implements multi-functionality by enabling electrodes to switch between stimulation and sensing modes. The same electrode can serve as a stimulation electrode during one time period and as a sensing electrode during another time period, allowing the system to perform both functions with a single electrode array
2Measurement precision
If the system performs comprehensive electrode distance tests using signal swapping, then the measurement precision of distances improves, but the loss of time increases
Solution Approach 1:
The patent performs preliminary electrode distance testing during the programming phase before clinical use. The system pre-determines the relative positions of stimulation and sensing electrodes by analyzing neural signals during this initial setup period, storing the distance relationships for later clinical applications
Solution Approach 2:
The patent implements periodic signal swapping between stimulation and sensing electrodes to gather distance information. By systematically alternating which electrode performs which function and analyzing the resulting neural signals, the system extracts distance measurements through repeated periodic measurements
3Ease of operation
If the system adjusts stimulation parameters based on neural signal magnitude alone, then the ease of operation improves, but the reliability of therapy deteriorates due to electrode displacement
Solution Approach 1:
The patent implements feedback control by continuously monitoring neural signals and adjusting stimulation parameters accordingly. The system measures the magnitude of neural signals in response to stimulation pulses and automatically adjusts the stimulation pulse magnitude to maintain consistent neural activation levels, compensating for electrode displacement
Solution Approach 2:
The patent replaces manual mechanical adjustment of stimulation parameters with automated electronic control based on neural signal feedback. The system uses processors to analyze neural signals and automatically adjust stimulation parameters, eliminating the need for manual reprogramming when electrode positions shift
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for precise adjustment of neurostimulation parameters, minimizing the impact of electrode displacement and body movements, thereby improving the efficacy and safety of neurostimulation therapy.
Implementation Method 1
The stimulation output circuit may be configured to deliver neurostimulation pulses to the neural target using a stimulation electrode selected from the plurality of electrodes
Implementation Method 2
The sensing circuit may be configured to sense neural signals from the neural target using a sensing electrode selected from the plurality of electrodes
Data Source
AI summary
A neurostimulation system may include a stimulation output circuit to deliver neurostimulation pulses using a stimulation electrode positioned at a stimulation distance from a neural target, a sensing circuit to sense neural signals using a sensing electrode positioned at a sensing distance from the neural target, and a stimulation control circuit that may include a test controller and a test processor. The test controller may be configured to control performance of an electrode distance test including sensing a first neural signal of the neural signals using the sensing electrode while delivering the neurostimulation pulses using the stimulation electrode and sensing a second neural signal of the neural signals using the stimulation electrode while delivering the neurostimulation pulses using the sensing electrode. The test processor may be configured to analyze the stimulation and sensing distances using the first and second neural signals.