Transcranial Alternating Current Dynamic Frequency Stimulation System
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Solution Overview
Problem
Conventional transcranial electrostimulation (TCES) devices face limitations due to the presence of direct current (DC) components, which cause discomfort and restrict the power delivery to the brain, making them ineffective for treating deep brain structures associated with Alzheimer's Dementia.
Innovation Solution
A transcranial electrostimulation system that generates a high current level, dual symmetric charge-balanced alternating current (AC) signal, with a stimulation current envelope defining multiple series of pulses at specific frequencies, and incorporates feedback for real-time charge balance to maintain efficacy and reduce discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional TCES devices use DC component to break down skin resistance, then current penetration is improved, but patient discomfort and pain increase
Solution Approach 1:
The patent removes the DC component entirely from the stimulation current, extracting only the harmful element while retaining the therapeutic benefits of AC stimulation. The system uses purely alternating current with zero net DC offset, eliminating skin breakdown and patient discomfort while maintaining effective neural stimulation.
Solution Approach 2:
The patent employs periodic AC waveforms with carefully controlled duty cycles and frequencies to achieve effective stimulation without DC offset. The periodic nature of the current allows for effective neural stimulation while the zero-net-charge characteristic prevents skin damage and discomfort.
2Object-affected harmful factors
If DC current is limited to reduce discomfort, then patient comfort is improved, but power delivery capability remains insufficient
Solution Approach 1:
The patent changes the fundamental parameters of the stimulation current by using high-frequency AC waveforms (e.g., 100 kHz carrier frequency) with specific duty cycles and amplitude ratios. These parameter changes enable high power delivery to deep brain structures while maintaining charge balance to prevent discomfort.
Solution Approach 2:
The patent employs dynamic waveform modulation where the AC signal parameters (amplitude, duty cycle, frequency) are adjusted in real-time to optimize power delivery. The system dynamically balances charge delivery to achieve deep brain penetration while preventing nociceptor depolarization.
3Object-affected harmful factors
If AC-only stimulation is used to avoid DC discomfort, then patient comfort is improved, but skin impedance rectification still generates DC component
Solution Approach 1:
The patent incorporates feedback mechanisms to monitor and adjust the stimulation waveform in real-time, ensuring that the AC signal maintains charge balance despite skin impedance variations. The system detects impedance changes and dynamically adjusts waveform parameters to prevent rectification-induced DC component generation.
Solution Approach 2:
The patent deliberately introduces asymmetry in the AC waveform parameters (different positive and negative amplitude ratios, asymmetric duty cycles) to compensate for the nonlinear rectification effect of skin impedance. This asymmetric design ensures that the net charge delivered remains zero despite the rectification process.
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 achieves significant improvements in efficacy and reduces patient discomfort by delivering higher power levels to deep brain structures, enhancing neural entrainment and metabolic responses, thereby improving treatment outcomes for Alzheimer's Dementia.
Implementation Method 1
a transcranial electrostimulation system produces a high current level, dual symmetric charge balanced alternating current electrical signal for delivery to the occipital region of a patient's brain
Data Source
AI summary
Transcranial electrostimulation systems and methods are contemplated in which a high current level, charge balanced alternating current electrical signal is generated for delivery to the occipital region of a patient's brain. By stimulating the brain with a charged balanced stimulation current with a stimulation current envelope defining one or more series of pulses at particular frequencies and durations designed to evoke metabolic response in the neurons, significant improvements in efficacy and reductions in patient discomfort may be achieved relative to earlier methods of transcranial electrical stimulation, especially those in which result in a resultant rectified direct current component being administered to the patient. Further advantages, especially in promoting neural entrainment, may be realized as well via utilizing multiple series of pulses at different frequencies, and via the dynamic adjustment of the stimulation waveform via incorporation of feedback signals in order to maintain charge balance in real-time.