Electrical Stimulation Drift Monitoring via Position Modulation

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Solution Overview

Problem

Implantable electrical stimulation systems face issues with stimulation drift due to lead migration, changes in target tissue, or desensitization over time, affecting the effectiveness and stability of therapeutic outcomes.

Innovation Solution

The system monitors stimulation drift by modulating the stimulation position around a primary position, altering electrode selection or amplitude, and adjusts parameters based on drift criteria, using sensors and patient feedback to automatically or manually correct the primary stimulation position.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the stimulation position is kept fixed at the primary position, then the system is simple to operate, but stimulation drift occurs over time reducing therapeutic effectiveness

Engineering Contradiction:

Improvetherapeutic effectivenessVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The stimulation position is changed from static to dynamic by automatically modulating around a primary position based on real-time monitoring of stimulation effectiveness. The system adjusts the stimulation position dynamically in response to detected drift, maintaining therapeutic effectiveness without requiring complex manual reprogramming.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

A feedback loop is implemented where the system monitors stimulation effectiveness metrics and uses this information to detect drift and automatically adjust the stimulation position. The feedback mechanism compares expected versus actual stimulation effects and triggers position modulation when drift is detected.

Inventive Principle:

Principle #23Feedback

2Reliability

If the stimulation position is modulated around the primary position, then stimulation drift is detected and corrected, but the system complexity increases

Engineering Contradiction:

Improvestimulation stabilityVSAvoidmonitoring system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system performs self-diagnosis and self-correction by automatically monitoring its own stimulation effectiveness and detecting when drift occurs. The implantable pulse generator autonomously modulates the stimulation position based on internal monitoring without requiring external intervention or complex external monitoring equipment.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system changes stimulation parameters (electrode selection, amplitude, pulse width) to modulate the stimulation position around the primary position. These parameter changes are used both to detect drift through monitoring effectiveness metrics and to correct drift by returning to optimal parameter settings.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If manual reprogramming is used to correct drift, then the system remains simple, but time is lost and therapeutic benefit is reduced

Engineering Contradiction:

Improvetherapeutic response timeVSAvoidreprogramming time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The system performs preliminary monitoring of stimulation effectiveness continuously in the background. When drift is detected, the system has already gathered the necessary information to trigger automatic position modulation, eliminating the time delay associated with manual detection and reprogramming by having the monitoring and correction mechanisms pre-positioned and automated.

Inventive Principle:

Principle #10Preliminary action

4Reliability

If the primary stimulation position is altered frequently, then drift is corrected maintainings effectiveness, but patient comfort and tissue stability may be compromised

Engineering Contradiction:

Improvestimulation effectivenessVSAvoidtissue irritation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The stimulation position is modulated periodically around the primary position rather than continuously or frequently. This periodic modulation allows the tissue to adapt to the changing stimulation patterns while still detecting drift through the varied stimulation positions, reducing tissue irritation while maintaining the ability to detect and correct drift.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS12533520B2Systems and methods for monitoring stimulation drift in an electrical stimulation system

Publication Date: 2026.01.27 BOSTON SCI NEUROMODULATION CORP

AI summary

A method for monitoring stimulation drift includes directing electrical stimulation through electrodes of a lead, wherein a selection of one or more electrodes and a stimulation amplitude for each of the one or more selected electrodes determines a stimulation position, wherein user programming of an implantable control module initially selects a primary stimulation position; modulating, over a time period of at least one day, the stimulation position around the primary stimulation position and delivering electrical stimulation at the modulated stimulation positions; for at least a plurality of the modulated stimulation positions and the primary stimulation position, receiving or observing a measure of stimulation effect; monitoring the measures of stimulation effect; and when the monitoring indicates a stimulation drift based on at least one drift criterion, performing at least one of the following: i) altering the primary stimulation position, or ii) generating a message.