ECAP-Guided Stimulation Control for Electrode Migration
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Solution Overview
Problem
Existing electrical stimulation therapies face challenges in maintaining consistent therapeutic efficacy due to changes in electrode positioning relative to target tissues caused by patient movement or lead migration, leading to transient overstimulation or reduced therapy effectiveness.
Innovation Solution
A medical device adjusts stimulation parameters based on evoked compound action potentials (ECAPs) using a control policy that includes a graphical user interface (GUI) for customization and real-time modification, allowing for automatic adjustments to prevent overstimulation and maintain optimal therapy delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical stimulation therapy is delivered via leads with electrodes, then therapeutic effect is achieved, but electrode positioning changes due to patient movement or lead migration cause transient overstimulation or reduced therapy effectiveness
Solution Approach 1:
The system continuously monitors ECAP signals in real-time and uses this feedback to dynamically adjust stimulation parameters. When ECAP amplitude exceeds a threshold indicating electrode migration or overstimulation risk, the system automatically reduces stimulation intensity. This closed-loop feedback mechanism resolves the contradiction by maintaining reliable therapy effectiveness while preventing harmful overstimulation events caused by positioning changes.
Solution Approach 2:
The system changes stimulation parameters (amplitude, pulse width, frequency) based on detected ECAP characteristics. When electrode positioning changes are detected through ECAP monitoring, the system adjusts parameters to compensate for the migration, thereby maintaining consistent therapeutic effect despite position changes that would otherwise cause overstimulation or reduced effectiveness.
2Device complexity
If stimulation parameters are fixed, then device simplicity is maintained, but patient perception of stimulation varies due to electrode movement
Solution Approach 1:
The system performs automatic self-adjustment of stimulation parameters based on real-time ECAP monitoring without requiring manual intervention. The control policy autonomously detects electrode migration through ECAP changes and adjusts stimulation intensity accordingly, maintaining consistent patient perception while keeping the device operationally simple for the patient.
Solution Approach 2:
The system transitions from fixed static parameters to dynamic parameters that automatically adapt to changing physiological conditions and electrode positions. The stimulation parameters become time-varying and condition-dependent, allowing the system to maintain consistent patient perception despite electrode movement while adding intelligence rather than physical complexity to the device.
3Reliability
If ECAP monitoring is implemented to detect electrode positioning changes, then therapy consistency is improved, but system complexity increases
Solution Approach 1:
The system uses the existing stimulation electrodes for dual purposes: delivering stimulation and monitoring ECAP signals. This multi-functionality allows ECAP monitoring to be implemented without adding separate sensing electrodes or hardware, thereby improving therapy consistency through ECAP-based detection while minimizing the increase in system complexity.
Solution Approach 2:
The system replaces complex mechanical positioning systems or external monitoring equipment with electrical ECAP monitoring through the existing stimulation circuitry. By using electrical signals already present in the stimulation system to detect electrode position, the achievement of consistent therapy is obtained with minimal additional complexity compared to mechanical or external sensing approaches.
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
The system effectively prevents uncomfortable sensations and maintains therapy efficacy by dynamically adjusting stimulation parameters in response to changes in electrode positioning, ensuring consistent patient perception and therapeutic outcomes.
Implementation Method 1
Electrical stimulation may be delivered to a patient by the medical device in a train of electrical pulses
Implementation Method 2
An evoked compound action potential (ECAP) is synchronous firing of a population of neurons which occurs in response to the application of a stimulus including, in some cases, an electrical stimulus by a medical device
Data Source
AI summary
This disclosure is directed to devices, systems, and techniques for controlling electrical stimulation. In some examples, a computing device includes a therapy-management application configured to assist a user to: capture a representative evoked compound action potential (ECAP) signal from a patient based; apply one or more filters to the representative ECAP signal to select one or more parameters of the representative ECAP signal; and control electrical stimulation therapy based at least in part on the one or more parameters.