Type-D EEG/ERP System (Nation 7128W-D24-E, Nation 7128W-D36-E Nation 7128W-D48-E, Nation 7128W-D60-E )

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 Specifications

For Type-D Amplifier

²        Input channels: 24/36/48 Monopolar EEG; 12channels Bipolar EEG

²        Power supply: Internal rechargeable lithium battery(16.8v); External charger input: AC100~240V, output DC 19V

²        Connection to PC: USB (HDMI interface) cable

²        Operation Modes: Real-time

²        A/D conversion: 24 bit

²        Sampling Rate: 128/256/512/1024/2048/4096/8192Hz

²        Input impedance: ≥10MOhm

²        CMRR: ≥100dB

²        Noise: ≤0.5uVRMS

²        Low-pass filter: 0-120Hz

²        Amplitude-frequency characteristic: 1-60Hz

²        High-pass filter: 0.01-0.3s

²        Interface: USB2.0 (USB1.1), interface transfer rate: 480Mb (/ 12Mb) / s

²        Dimension & Weight: 300*230*60(mm); 1.65Kg (amplifier only)

For Stimulator (ERP Part)

2.1    A/V stimulator

2.1.1            Normal type sound stimulation parameter

²        Stimulation type: Short tone,Pure tone,White noise;

²        Stimulation mode of short tone:Left-ear,Right-ear,Binaural, Alternate;

²        Phase of short tone stimulation:rare wave, dense wave, alternative wave;

²        The maximum short tone intensity:≥130dB

²        The maximum pure tone intensity:≥120dB

²        The maximum white noise intensity:≥100dB

²        Stimulation Frequency: 0.1~100Hz, error ≤±10%

²        Pure tone sound frequency:250~7KHz, error ≤±10%

²        Pure tone stimulation modes:Left-ear, Right-ear, Binaural,Alternate

²        Target signal probability:5%~100%, error ≤±10%

2.1.2            Video output signal

²        Checkerboard images, Bar grid images,vertical grid images

²        Grids number:4*4~64*32

²        Output control:Full-screen,Half-screen(top,bottom,left,right),1/4 screen (I, II, III, IV quadrant display)

2.2    Current stimulator

²        Maximum current pulse output intensity:100mA

²        Pulse output frequency:0.1Hz ~ 100Hz

²        Stimulator modes: Single-stimulator mode, Dual-current stimulator mode

2.3    Photic stimulator

²        Stimulation frequency: 0.1~30Hz,error ≤±10%

²        Flash time:1~50 minutes

Application

EEG/ERP is used in clinics or research labs by emitting 2 different stimulation signals (one Target signal and a non-Target signal) to the person wearing the equipment. The doctor/researcher then analyzes the reaction of the person towards the signals emitted based on the change in the person’s EEG waveforms and compare them to EEG waveforms of patients with neuropsychopathic disorders such as schizophrenia, ADHD and mental retardation, to determine if the person has the said symptoms. In addition, the EEG/ERP system is used to test the degree of concentration amongst teenagers.      

Key Features & Advantages

Professional EEG amplifier suitable for all standard applications of routine EEG and long term EEG monitoring in the research and clinical areas. Configurable in a number of setups according to user’s needs:

u        24/36/48/60 channels monopolar EEG;

u        24/36/48 channels monopolar EEG + 12 channels bipolar EEG;

u        24/36/48 channels monopolar EEG + 12 channels bipolar EEG + ERP examination with Acoustic & Visual stimulator, consisting of three stimulation functions (sound, light and electricity) which can be configured with special earphones and VEP monitor.

24 bits A/D conversion rate, with high sampling rate of up to 8 kHz.High quality real-time EEG signal acquisition is transmitted via fiber optical isolation, which shields away interference from power line and other signals, transmitting stable and reliable measurement data at high-speed while greatly ensuring patient’s safety. Amplifier can be operated either by DC power without affecting signal quality.Head-box design to access single shielded cup/clip electrodes with touch proof connectors (1.5mm).Built-in impedance testing function and automatic calibration (for both sine wave and square wave signals).Optional video system for recording, editing and displaying video images synchronously with EEG signals.

Software Functions

Acquisition & Settings

u       Colors of waveforms are in accord to colors of events, and users can mark on the waveforms with character directly; it’s available to open respiration leading sound to instruct patient's respiration frequency in a deep respiration event;

u       EEG channels can be arbitrarily set up for users to customize the layout of channels during collection process and playback analysis. This includes the choice of processing EEG waveforms with filters, baseline and other arbitrary parameters;

u       Configuration chart display and data source of physical channel configuration are displayed together at the same interface, making channel editing simpler and more intuitive;

u       Events markers enable user to mark timings of seizures or any abnormal wave occurrences during recording, whereby events marked are listed and can be traced with the event localization feature during playback;

u       Sound, light and electricity evoking is available during ERP data acquisition, and different evoke methods can be applied to different patients to extract evoking waveform;

u       Superposition of ERP waveforms eliminates clutter and reserve EP data clearly;

u       Superposition of different event EP waveforms according to event's classification setting;

u       Same-screen, and real-time display brain tendency chart is in synchronism with EEG waveforms acquisition. Brain tendency chart include various energy curve maps: energy curve, peak value frequency, relative energy, absolute energy, energy peak frequency, medium frequency index, side frequency index and coma index.

Replay & Analysis

u       EEG mapping;

u       EEG tendency analysis;

u       EEG spectral analysis;

u       Brain waves fast playback and fast positioning function;

u       Automatic spike recognition with adjustable arbitrary spike-wave parameters;

u       ERP data averaging function;

                                                       

Type-D EEG/ERP System (Nation 7128W-D24-E, Nation 7128W-D36-E Nation 7128W-D48-E, Nation 7128W-D60-E )