Anterior Nucleus Stimulation Mapping for Target Selection
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Solution Overview
Problem
Current medical devices for deep brain stimulation and therapeutic agent delivery lack an effective method to select the optimal target site within the brain for treating conditions like epilepsy, as they do not adequately map the functional connectivity between different brain areas, leading to inconsistent therapeutic outcomes.
Innovation Solution
A system and method that involves delivering electrical stimulation to multiple areas of the anterior nucleus of the thalamus at varying frequencies and monitoring the resulting brain activity in the hippocampus to map functional connections, allowing for the selection of a target therapy delivery site based on desirable brain activity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical stimulation is delivered to a single fixed target site in the brain, then the device complexity is reduced, but the therapeutic efficacy becomes inconsistent due to lack of functional connectivity mapping
Solution Approach 1:
The anterior nucleus of the thalamus is divided into multiple discrete stimulation targets (anterior ventral, anterior dorsal, anterior intermediate) that can be individually activated. This segmentation allows systematic mapping of functional connectivity between different thalamic subregions and the hippocampus, enabling identification of the optimal target site without requiring complex whole-brain stimulation systems
Solution Approach 2:
Functional connectivity mapping is performed during the surgical implantation procedure or in a pre-programming phase before final therapeutic stimulation parameters are established. This preliminary mapping action identifies the optimal target site and stimulation parameters in advance, ensuring consistent therapeutic efficacy without requiring complex real-time adjustment mechanisms during therapy delivery
2Measurement precision
If multiple areas of the anterior nucleus are stimulated to map functional connections, then the precision of target site selection is improved, but the time required for therapy setup increases
Solution Approach 1:
Electrical stimulation is delivered in a systematic periodic sequence to different subregions of the anterior nucleus (ventral, dorsal, intermediate areas) during the mapping phase. This periodic stimulation protocol allows efficient comparison of functional connectivity responses across multiple targets within a standardized time framework, minimizing setup time while maintaining high precision in target selection
Solution Approach 2:
The functional connectivity mapping process creates a simplified model or map of thalamic-hippocampal connections that can be used to identify optimal targets. This copying approach allows the complex multi-area stimulation data to be reduced to a clear target selection guide, enabling precise target identification without requiring repeated complex stimulation protocols during therapy delivery
3Measurement precision
If high frequency electrical stimulation (>=80 Hz) is used to map functional connectivity, then the accuracy of brain activity modulation assessment is improved, but the energy consumption increases
Solution Approach 1:
High frequency stimulation (>=80 Hz) is applied selectively only to the specific subregions of the anterior nucleus that show functional connectivity to the hippocampus, rather than uniformly to the entire thalamus. This partial application of excessive frequency stimulation achieves accurate brain activity modulation assessment in the relevant circuits while minimizing overall energy consumption by limiting high-frequency delivery to only the necessary target areas
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 enables precise selection of a target therapy delivery site, improving the efficacy of deep brain stimulation by identifying areas that effectively suppress or modulate brain activity, thereby enhancing treatment outcomes for conditions such as epilepsy.
Implementation Method 1
controlling a medical device to deliver electrical stimulation to a plurality of different areas of an AN of a thalamus of a brain of a patient
Data Source
AI summary
In some examples of selecting a target therapy delivery site for treating a patient condition, a relatively high frequency electrical stimulation signal is delivered to at least two areas within a first region (e.g., an anterior nucleus of the thalamus) of a brain of a patient, and changes in brain activity (e.g., as indicated by bioelectrical brain signals) within a second region (e.g., a hippocampus) of the brain of the patient in response to the delivered stimulation are determined. The target therapy delivery site, an electrode combination, or both, may be selected based on the changes in brain activity.