eWave is a multi-channel bio-signal amplifier, which has 8, 16 or 24 recording channels. eWave provides a wide input sensitivity to record various bio-signals such as EEG, EMG, ECG and EOG. Besides, eWave is a special ERP acquisition system with high precision. Sciencebeam has also offered eCap series of EEG caps to provide consistent signal recording of up to 128 electrodes. Furthermore, external body sensors can be connected in order to record various biological signals. eProbe software, which is a user friendly software that is compatible with eWave device, is also offered by Sciencebeam company for visualization and analysis of recorded signals. Also, all 128 channels can be analyzed real-time with eBridge Simulink software.
Size: 112 (L) × 77 (W) × 25 (H)
Weight: 168 gr
Interface: USB, Bluetooth
Digital inputs: 4 digital trigger inputs
Supply: 5V DC, Lithium battery
Sampling frequency: 1000 Hz per channel (increasing to 15000 Hz per channel in USB connection)
Bandwidth: 200 Hz
Noise level: less than 0.5 μνrms
Amplifier type: DC, differential
Input impedance: 109 ΩSafety class: ǁ
Standards: IEC, CE, ISO13485, ISO9001
EEG, which is a non-invasive method for measuring brain electrical activity, helps the clinicians in diagnosis conditions affecting brain such as head injuries, headaches, brain tumors, sleep problems and etc. The eWave device can be used in hospitals so as to help the clinicians in diagnosis special conditions. Besides, due to eProbe software’s abilities, it is possible to import the recorded data into MATLAB, EEGLAB and LABVIEW environments for processing purposes.
An efficient ERP acquisition system:
ERP (Event-Related Potentials) are small Changes in scalp recorded EEG that are time-locked to an onset Auditory or visual stimulus. ERP is used to investigate the process of information in the brain.
In ERP recording results, there is a time gap between stimulus presentation and the point of “Max” value (peak). Presumable components in the laptop that the time-gap or delay occurs are; CPU, motherboard, and graphic card. This delay depicts the time taken by the stimulus information to generate the ERP results.
To prevent this pause and get a precise result in a recording; We have designed a module in our eWave+ that omits the delay and enables the ERPs recording to happens in real-time and leaves no gap between stimulus presentation and the subject’s experience.
Other ERP acquisition systems record ERP as command executes from the monitor, except eWave+, which records stimulus presentation synchronously in ERP Results. This exclusive feature only exists in eWave+ and makes it the most explicit ERP acquisition system in the world.
Record EEG, TMS and tDCS simultaneously:
Transcranial Magnetic Stimulation (TMS), which is a non-invasive form of brain stimulation, uses a changing electromagnetic field to cause electric current at a specific area of brain. Due to the latest developments, simultaneous recording of EEG and TMS has become possible. The combination of TMS with simultaneous EEG provides the possibility to non-invasively probe the brain’s excitability in real-time.
Transcranial Direct Current Stimulation (tDCS) is a form of brain stimulation, where very low levels of constant current are delivered to specific areas of brain. Basically, tDCS is developed to help patients with brain injuries or psychological conditions such as depression. The combination of tDCS with simultaneous EEG provides valuable information about tDCS mechanisms. The combined EEG-tDCS system can also be used for preventive treatment of neurological conditions. eWave device has provided simultaneous recording of EEG with TMS and tDCS.
Record High Frequency Oscillations:
High Frequency Oscillations (HFOs) usually occur in epilepsy patients which can be recorded with the Electrocorticogram (EcOG) with the implemented electrode grids in their brains. Recording HFOs requires a high performance bio-signal amplifier with high sampling frequency and a very good Signal-to-Noise Ratio (SNR) and resolution. Mapping neural networks is important for pre-surgical planning in epilepsy patients. Since HFOs can be found in such neural networks, brain surgeons need to distinguish physiological HFOs from pathological ones.
Due to eWave’s high sampling frequency (1000 Hz) and very good SNR, it has the ability to record HFOs. EcOG electrodes from Ad-Tech, PMT, Unique Medical and Cortec can be used with eWave+.
eWave is compatible with a wide range of software in order to meet the needs of various users including engineers, researchers, scientists, clinicians, and psychologists. This software include MATLAB, LABVIEW, NeuroGuide, Tobi and etc
Slow Cortical Potentials (SCPs) are based on electrical activity in the brain usually less than 1 Hz, which are generally used in neuro-feedback treatments. eWave provides the possibility to record SCPs.
Record EEG and fNIRS simultaneously:
EEG and fNIRS are two complementary techniques for measuring brain activity. While EEG measures the magnetic field created by firing neurons in the brain, fNIRS measures the change of oxygen in the blood when a brain region becomes active. By combining EEG and fNIRS, a more complete picture of brain is obtained, which includes activation and energy demand of neurons. eWave in combination with eFNIRS sensor enables simultaneous recording of EEG and fNIRS. By connecting eFNIRS to eCapflex or eCapfabric with 8 fNIRS sensors, simultaneous recording of EEG and fNIRS becomes possible.
SmartBox BCI System:
A BCI system is a communication channel between a brain and a computer. This computer-based system acquires brain signals, analyzes and converts them into actions including hand or leg movement, opening or closing a door and other daily activities. A BCI system especially improves the quality of life of disabled patients and makes possible to interact with their environment. Connecting SmartBox to eWave provides an efficient BCI system which is MATLAB-based and includes all required parts for data recording, real-time analysis and also data classification. Also, you can import data in Simulink directly by using eBridge environment, where visualization, feature extraction and classification of your data is possible by using the Simulink blocks.