This Project quickly captures Seizure symptoms from EEG of patients with Epilepsy and applies Stimulation current to the patient’s brain to alleviate Seizure symptoms.
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[2] Specification
EEG Measurement (Amplifying & Analog Filtering)
Real-time Fast Fourier Transform Operation (Cooley-Tukey algorithm)
Real-time Digital IIR Notch Filtering of 60Hz Power line Noise
Transmit EEG data to PC by UART with DMA
Plot EEG Signal in Time-domain or Frequency-domain
Bi-phasic Pulse Generation for Stimulation
Stimulation Current Selection from Current Steering DAC
Passive Discharge to Eliminate Residual charge
1. Block Diagram of EEG Measurement & Stimulation System
2. Schematic of EEG Measurement & Stimulation System
3. PCB Artwork of EEG Measurement & Stimulation System
4. Detailed Description of EEG Measurement &
Stimulation System
[1] Anti-aliasing Filter & Filtered EEG Signal
Anti-aliasing Filter consist of 1st order LPF with 100 of DC Gain and Two Sallen-key LPF with Unity Gain, which are Cascaded
Raw EEG signal is Amplified and Low pass filtered by Anti-aliasing Filter, then it becomes a Band-limited Signal
[2] 60Hz Digital IIR Notch Filter & Filtered EEG Signal
Digital Notch Filter Reduces 60Hz Power-line Noise in EEG signal very Accurately and Effectively
Because of Phase delay of Notch Filter, Mark Freq of 60Hz doesn’t Represent Actual 60Hz at 1st figure
[3] Bi-phasic Stimulation Pulse
Seizure symptoms can be captured by Frequency Analysis(FFT operation) of EEG signal
Bi-phasic Stimulation Current is generated by Bi-polar Current Driver and Stimulation Current value is determined by Current Steering DAC
[4] Signal Plotting in Time-domain or Freq-domain
5. Bare PCB & PCBA of EEG Measurement &
Stimulation System
6. Verification of EEG Measurement & Stimulation System
