Vibration Stimulation Cortical Mapping via ECoG
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Solution Overview
Problem
Current methods for cortical mapping in epilepsy surgery, such as electrical cortical stimulation, are limited by subjective interpretation, difficulty in eliciting responses in children, and the risk of after-discharges leading to seizures, particularly in young or non-verbal patients.
Innovation Solution
A system and method using vibration stimulation instead of electrical stimulation, which involves a stimulation pad connected to a computing device and neural interface processor, allowing for somatosensory and motor cortex mapping without direct communication with the patient, using ECoG electrodes to record cortical signals and create 3D maps for surgical planning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical cortical stimulation is used for mapping, then functional delineation of eloquent tissue is achieved, but after-discharges occur leading to seizures
Solution Approach 1:
The patent replaces electrical stimulation with mechanical vibration stimulation. The vibration stimulation device delivers mechanical vibrations to the skin surface, which then naturally activate the somatosensory system without directly stimulating cortical neurons electrically. This substitution eliminates the harmful after-discharges while preserving the ability to map functional cortex through observation of natural sensory and motor responses.
2Measurement precision
If electrical cortical stimulation is used for mapping, then sensory and motor responses are elicited, but subjective interpretation is required
Solution Approach 1:
The system uses the patient's own natural physiological responses to vibration stimulation to provide objective mapping data. The vibration stimulates the skin and underlying sensory receptors, which naturally propagate signals through the somatosensory pathway to the cortex. The resulting cortical activity is recorded by ECoG electrodes and processed algorithmically to generate functional maps, eliminating the need for subjective patient reporting or interpreter judgment.
3Measurement precision
If electrical cortical stimulation is used for mapping, then cortical activity is elicited, but detailed communication with patient is required
Solution Approach 1:
The vibration stimulation system is self-reporting through observable motor responses. When vibration is applied to specific skin areas, the natural reflex arc and cortical processing produce observable motor movements or changes in muscle tone that can be detected by the system. This eliminates the need for the patient to communicate sensations or for the examiner to interpret subjective reports, making the procedure feasible for non-verbal or cognitively impaired patients.
4Object-affected harmful factors
If vibration stimulation is used instead of electrical stimulation, then after-discharges and seizures are avoided, but mapping resolution must be maintained
Solution Approach 1:
The system uses real-time feedback from ECoG electrodes to detect and localize cortical responses to vibration stimulation. The ECoG signals provide high-resolution spatial information about which cortical areas are activated by vibration of specific skin regions. This feedback loop allows the system to build detailed functional maps by systematically stimulating different skin areas and recording the corresponding cortical activation patterns, achieving high resolution without electrical stimulation.
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 accurate cortical mapping with reduced risk of brain injury during surgery, as it elicits robust neural responses and provides high-resolution maps without the need for subjective interpretation or patient communication, even in unresponsive subjects.
Implementation Method 1
The present disclosure overcomes the aforementioned drawbacks by providing a system and method that delivers vibration to the skin rather than electrical stimulation to the brain.
Implementation Method 2
electroencephalographic (ECoG) recording... ECoG electrodes to record cortical signals
Data Source
AI summary
An apparatus for cortical mapping and method for using same are disclosed. The apparatus comprises a ECoG electrodes array, a stimulation pad, a neural interface processor, and a computing device for mapping eloquent cortical regions of a subject's brain without using exogenous stimulation and with high resolution.