g.HIamp: Specs & Features

Pathbreaking technology for brain mapping

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High demands lead to high level solutions and pathbreaking technology. g.HIamp is a 256 channel biosignal amplifier for invasive and non-invasive measurements of brain functions that is CE approved. The amplifier has 256 ADC converters with 24 Bit inside for perfect signal resolution and has a wide input sensitivity to be able to measure EEG, ECoG, ECG, EMG, EOG without any saturation. Additionally external sensors can be connected. All channels are DC coupled. Internally signal processing is performed with the fastest floating point DSP and a sophisticated Linux Kernel. The amplifier performs a very high oversampling to reduce the noise as much as possible by averaging samples.

256 channels can be analyzed in real-time with the g.tec Highspeed Processing for Simulink toolbox. This leads to faster and more accurate control of brain-computer interface systems done with Common Spatial Patterns (CSP).

g.HIamp is powered by a medical mains power supply or by a battery pack and the system is connected to the computer via USB. The system is equipped with 16 digital trigger channels and a HOLD input for artifact suppression (e.g. during electrical or magnetical stimulation).

g.HIamp provides 80, 144 or 256 channels per unit. 80 and 144 channel systems can also be upgraded later on. Each block of 64 channels is connected via a multi-pole medical safety connector to the electrode interface box. 

A big advantage is that g.HIamp can be used with passive or active electrodes. The difference is just the electrode connector box (headbox). For ECoG grids and strips special interface connectors are available.

Product Highlights

  • 256 channels perfectly synchronized with 24 Bit
  • supports active and passive EEG electrodes and ECoG grids
  • CE certified medical product
  • fully integrated into g.tec software components for real-time analysis 
  • integrated impedance measurement for active and passive electrodes

MORE PRODUCT DETAILS

INPUT CHANNEL PROPERTIES

g.HIamp uses wide-range DC-coupled amplifier technology in combination with 24-bit sampling. The result is an input voltage of +/- 250 mV with a resolution of <60nV! This means that every electrophysiological signal can be recorded directly without additional hardware. Neither high electrode offset voltage nor big artifacts resulting from electrical or magnetic stimulation will saturate the amplifier inputs. This feature is important for various artifact treatment and correction algorithms. The use of digital filters avoids hardware related variations between channels.

ACCURACY AND DATA QUALITY

The amplifier is driving each ADC with 614,4 kHz which is much higher than the required sampling frequency. Then internally the floating point DSP performs the oversampling and averages samples to increase the signal-to-noise ratio. If the amplifier works e.g. with 256 Hz than 2400 samples are averaged and this suppresses the noise by a factor of 49. In addition the floating point DSP performs also the real-time bandpass filtering and NOTCH filtering of the data. Several hundred different bandpass filters are predefined. Also bipolar derivations can be calculated by the DSP to work with a very high CMRR.
The amplifier uses 256 ADC for the 256 channels and therefore all signals are sampled exactly at the same time point to avoid any time delay between channels. This is especially important for brain mapping procedures.

ADD MORE CHANNELS

g.HIamp can be ordered with 64+16, 128+16 or 256 channels initially. The 64+16 channel version comes with one 64 and one 16 channel connector box. The 128+16 version comes with two 64 channel and one 16 channel connector box and the 256 channel version comes with four 64 channel boxes. Later on if more channels are required the amplifier can be upgraded by inserting more amplifier channels. This allows to start with a cheaper setup.

SKIN-ELECTRODE IMPEDANCE

g.HIamp uses a new principle for impedance measurement that allows to determine the skin-electrode impedance for passive and also for active electrodes. It works also for gel or dry electrodes provided by g.tec and even for ECoG grids. The impedance values are color coded and are shown for all the 256 channels in one window which is updated every 3 seconds! The impedance check can also beep if an electrode was successfully mounted.This allows a very fast assembling of electrodes during real-time impedance control. 

SOFTWARE OPTIONS

g.tec's philosophy is to provide a broad spectrum of software solutions for different groups of users (e.g. for engineers, researchers & scientists, physiologists, and medical staff, but also for software developers & programmers). From comfortable Windows-based recording software to MATLAB/Simulink based tools and device drivers and APIs you will find the appropriate tools for your application. Please see the list of related products/software below for more details. g.HIamp is also supported and integrated into the main core of BCI2000.

IMPORTANT INFORMATION

As with all g.tec biosignal amplifiers, we give a full 5-years warranty on g.HIamp. g.HIamp is a safe certified medical device for research in humans, even for invasive recordings such as electrocorticography (ECoG). It must not be used for patient monitoring or determination of brain death. Medical diagnosis and decisions about treatment of diseases must not be based (solely) on results obtained with this device.


CONNECT ACTIVE/PASSIVE ELECTRODES

A brilliant feature of the g.HIamp is that the main amplifier unit can be used with different electrode connector boxes. Therefore the main amplifier unit is only purchased onces and can be used for many different applications:

  • passive electrode connector box - comes with 64 channels and is connected to one of the 4 groups of g.HIamp. It can be used with standard 1.5 mm safety connectors which are standard for EEG and ECoG electrodes.
  • active electrode connector box - comes with 64 channels and is connected to one of the 4 groups of g.HIamp. It has 2-pin connectors to support all g.tec active electrodes such as g.LADYbird or g.BUTTERFLY.
  • passive electrode connector box with 16 channels - comes with 16 channels and is connected to one of the 4 groups of g.HIamp. This connector box is useful to have additional inputs for external sensors.


Available configurations

Hardware and Accessories

product no.: 7001 read more g.HIamp 80, silvergrey, color code: A08
product no.: 7001a read more g.HIamp 80, saphirblack, color code: 475
product no.: 7001b read more g.HIamp 80, calypsored, color code: 252
product no.: 7001c read more g.HIamp 80, malachitgreen, color code: 205
product no.: 7001d read more g.HIamp 80, mysticblue, color code: A07
product no.: 7002 read more g.HIamp 144, silvergrey, color code: A08
product no.: 7002a read more g.HIamp 144, saphirblack, color code: 475
product no.: 7002b read more g.HIamp 144, calypsored, color code: 252
product no.: 7002c read more g.HIamp 144, malachitgreen, color code: 205
product no.: 7002d read more g.HIamp 144, mysticblue, color code: A07
product no.: 7003 read more g.HIamp 256, silvergrey, color code: A08
product no.: 7003a read more g.HIamp 256, saphirblack, color code: 475
product no.: 7003b read more g.HIamp 256, calypsored, color code: 252
product no.: 7003c read more g.HIamp 256, malachitgreen, color code: 205
product no.: 7003d read more g.HIamp 256, mysticblue, color code: A07

Complete Solutions

product no.: 8000 read more g.HIamp 80 package BASE, PC included — base system for EEG recordings; consisting of: g.HIamp 64 + 16; g.HEADbox-passive; g.HEADbox16; trigger cable for g.HIamp; g.Recorder; fully equipped business PC
product no.: 8001 read more g.HIamp 144 package BASE, PC included — base system for EEG recordings; consisting of: g.HIamp 128 + 16; g.HEADbox-passive; g.HEADbox16; trigger cable for g.HIamp; g.Recorder
product no.: 8002 read more g.HIamp 256 package BASE, PC included — base system for biosignal recordings; consisting of: g.HIamp 256; g.HEADbox-passive; g.HEADbox16; trigger cable for g.HIamp; g.Recorder
product no.: 8003 read more g.HIamp 80 package ACTIVE — active electrode upgrade for g.HIamp 80 package BASE consisting of: g.HEADbox-active; g.GAMMAcap²SET; g.GAMMAcap²BELT; 70 g.LADYbird electrodes; g.LADYbirdGND; g.GAMMAearclipAg/AgCl
product no.: 8004 read more g.HIamp 144 package ACTIVE — active electrode upgrade for g.HIamp 144 package BASE consisting of: 2 g.HEADbox-active; g.GAMMAcap²SET; g.GAMMAcap²BELT; 130 g.LADYbird electrodes; g.LADYbirdGND; g.GAMMearclipAg/AgCl
product no.: 8006 read more g.HIamp package BCI — upgrade for BCI research consisting of: g.HIamp SIMULINK HIGH-SPEED ONLINE Processing; g.HIamp P300 + Ping Pong + SSVEP model; g.HIamp common spatial patterns; g.RTanalyze; g.BSanalyze (Base + EEG + Classify)
product no.: 8007 read more g.HIamp 80 CARDIObundle, PC included — system for ECG and blood pressure recordings

See some related products

Hardware and Accessories

product no.: 7282 read more g.HIamp USB cable — connection of g.HIamp to USB-port of PC/notebook
product no.: 7225 read more g.HIamp cable for short-cut function (SC) — 3m cable with 3pin screw terminal
product no.: 7276 read more Trigger cable for g.HIamp — for 8 digital lines to DIG IN 1 or 8 digital lines to DIG INS g.HIamp HA-xxxx.xx.xx to D-SUB 25 male (parallel port), 3 m
product no.: 7051 read more g.HIamp water-proof heavy duty case — 100 % water-proof heavy duty case for g.HIamp equipment
product no.: 7004 read more g.Power - g.HIamp — medical mains power supply for g.HIamp; 110/230 V; 50/60 Hz power line; single 5 V supply
product no.: 7005 read more g.HEADbox - active — electrode interface box for 64 active channels, for usage with g.HIamp; works with g.tec 2 pin safety connector active electrodes; g.INTERfaceHEADbox2HIamp (7008); g.HEADboxPOWER (7009)
product no.: 7006 read more g.HEADbox - passive — electrode interface box for 64 passive channels, for usage with g.HIamp; works with 1.5 mm medical safety connector passive electrodes; g.INTERfaceHEADbox2HIamp (7008)
product no.: 7007 read more g.HEADbox16 - passive — electrode interface box for 16 passive channels, for usage with g.HIamp; works with 1.5 mm medical safety connector electrodes
product no.: 7008 read more g.INTERfaceHEADbox2HIamp — interface cable g.HEADbox to g.HIamp with multi pole connector
product no.: 7009 read more g.HEADboxPOWER — power supply cable for g.HEADbox
product no.: 7277 read more adapter cable for trigger cable — DSUB25 female to 8xBNC (including 8xBNC to CINCH adapter)
product no.: 0274d read more g.TRIGbox for g.HIamp — 3 x 4 trigger inputs for analog, optical and digital trigger signals; adjustable thresholds; 1 x analog encoded output; cable for 3 x trigger output included
product no.: 0268a read more g.Power - for g.TRIGbox — medical mains power supply for g.TRIGbox (0274a/ub/b/c); 110/230 V; 50/60 Hz power line; single 9 V supply
product no.: 0269 read more g.TRIGbox, push-button — bounce-free, to record subject responses, 1.8m cable
product no.: 0271 read more g.TRIGbox, microphone — to trigger on acoustic events, 1.8 m cable
product no.: 0270 read more g.TRIGbox, optical trigger sensor — for screen marker or strobe lamp detection, 1.8 m cable

Software

product no.: 0111 read more g.RTanalyze: Specs & Features — real-time biosignal processing blockset under SIMULINK; real-time algorithms
product no.: 7263 read more g.HIamp C API — driver software package for g.HIamp; full access to recording buffer; for user specific applications on the PC; sophisticated data acquisition and processing software almost under any programming language
product no.: 7263a read more g.HIamp C API + BCI2000 — application programming interface (API) for the user specific application (eg. developed in C/C++); BCI2000 driver; BCI2000 software package
product no.: 0139d read more g.HIamp P300 model — 8-channel P300 based speller
product no.: 0140d read more g.HIamp Ping Pong model — 2 subject and 4-channel motor imagery based game

Electrodes and Sensors

read more g.GAMMAsys: Specs & Features — active electrode system for EEG/EMG/EOG/ECG
read more g.SAHARA: Specs & Features — active dry EEG electrode system
read more g.EEGcap: Specs & Features — EEG cap & electrode system
read more g.Electrodes: Specs & Features — various active and passive electrodes for electrophysiological recordings
read more g.Sensors: Specs & Features — various sensors for physiological and physical signals

Related Media and Documents

g.HIamp

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gHIamp_InstructionsForUse — 17/02/2012 — 1.12 MB