Closed-loop DBS System Reducing Stimulation Time via Beta Oscillation Detection
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Solution Overview
Problem
Conventional open-loop deep brain stimulation (DBS) systems deliver continuous electrical stimulation, leading to adverse side effects, reduced battery life, and increased surgery frequency due to excessive current flow, without adequately addressing changes in physiological states.
Innovation Solution
A closed-loop DBS system that uses neural electrodes to record local field potential signals and a processing unit to analyze beta band oscillations, generating DBS pulses only when abnormal oscillations are detected, thereby reducing stimulation time and avoiding adverse effects while maintaining treatment efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous DBS stimulation is delivered, then treatment efficacy is maintained, but adverse side effects increase and battery lifetime is reduced
Solution Approach 1:
The patent implements a closed-loop feedback system where LFP signals are continuously monitored and analyzed for beta band oscillations. The DBS stimulation is dynamically adjusted based on the detected neural activity patterns, delivering stimulation only when abnormal beta oscillations are detected. This feedback mechanism maintains treatment efficacy while reducing unnecessary continuous stimulation, thereby minimizing adverse side effects and extending battery lifetime.
Solution Approach 2:
The system transitions from continuous stimulation to periodic, event-driven stimulation. Stimulation is delivered in response to detected beta band oscillations rather than continuously, creating a periodic action pattern that is triggered only when physiologically necessary. This approach maintains therapeutic effect while significantly reducing total stimulation time and associated harmful effects.
2Reliability
If continuous DBS stimulation is delivered, then motor symptoms are controlled, but battery lifetime is reduced
Solution Approach 1:
The closed-loop feedback system monitors LFP signals and adjusts stimulation delivery based on real-time detection of beta band oscillations. By delivering stimulation only when abnormal oscillations are present rather than continuously, the system maintains motor symptom control while significantly extending battery lifetime through reduced energy consumption.
Solution Approach 2:
The system applies partial action by delivering stimulation only when and where needed (when beta oscillations are detected) rather than applying full continuous action. This selective, partial stimulation approach maintains sufficient therapeutic effect while reducing overall energy consumption and extending battery operation.
3Reliability
If continuous DBS stimulation is delivered, then treatment coverage is maintained, but current flow to adjacent structures increases
Solution Approach 1:
The feedback mechanism uses LFP signal analysis to detect beta band oscillations and triggers stimulation only when these pathological patterns are present. This ensures treatment coverage is maintained during periods when abnormal activity occurs while minimizing current flow to adjacent structures during normal physiological states, reducing harmful side effects.
Solution Approach 2:
The system employs periodic stimulation triggered by detected beta oscillations rather than continuous stimulation. This creates discrete stimulation episodes that provide necessary treatment coverage while minimizing cumulative current exposure to adjacent neural structures, reducing the generation of harmful factors.
Data Source
AI summary
The present disclosure provides a closed-loop DBS system and method for regulating motor symptoms of a subject. The DBS system comprises: neural electrodes for being implanted in deep brain nuclei of the subject and a closed-loop stimulation generator in communication with the neural electrodes. The stimulation generator includes: a data acquisition unit configured to receive the LFP signals transmitted from the neural electrodes and convert the LFP signals to LFP data; a processing unit in communication configured to analyze the LFP data to determine presence of abnormal beta band oscillation and generate a DBS signal upon determining presence of abnormal beta band oscillation; and a pulse generation unit configured to generate, in response to the DBS signal, the DBS pulses to the deep brain nuclei through the neural electrodes. The provided system and method can save stimulation time and avoid adverse side effects of continuous stimulation while maintaining treatment efficacy.