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Grass Technologies amplifiers are world-renowned in the field of neurophysiology for their quality, reliability, simplicity, and serviceability. The amplifier system provides isolation, amplification, filtering, and digitization. Communication with the host computer is via a standard Ethernet cable to the PC’s network interface card. TWin software sets the sample rate, starts and stops Video/EEG acquisition, and stores the data to the PC’s hard disk or fileserver.

AURA (Ambulatory Universal Recording Amplifier) amplifier system has a front-end sampling rate of 400 Hz (record 200 or 400 Hz, user definable). The electrode input jack box provides 32 AC inputs, 2 reference inputs and 2 ground inputs. The redundant references and grounds provide reliability and signal integrity during long-term monitoring procedures.

The 42-channel system has the capability of recording data directly to a PC or can be untethered for temporary ambulatory recordings. The compact and lightweight design of AURA offers maximum patient comfort, without sacrificing the ruggedness required for long-term studies.

AURA is typically tethered to the base station, which streams data to a host computer running TWin. However, AURA is also capable of operating untethered. When the patient cable is disconnected, AURA will automatically switch and record the EEG data to a CompactFlash (CF) memory card. If there is an immediate need to download and review the data stored on the CompactFlash memory card, the CF can be removed from AURA and the data can be downloaded quickly via a USB CompactFlash Reader.

With AURA, the patient can move from their patient room to a day room. When the patient arrives at the day room, AURA simply needs to be plugged into any base station located in that room. Our TWin recording software will recognize that the patient has switched to a new base station, and tethered recording will resume. An automatic room switching option is available to also switch the video and audio from the patient room to a dayroom.

An 8-channel DC input module and optional pulse oximeter (SpO2/HR) allow for an additional 10 channels of data. This flexibility allows for a wide range of physiological parameters to be monitored and recorded. An optional external battery pack is available to enable recording of 24-hour ambulatory EEG studies. The technologist can check electrode impedances, perform amplifier calibration, and control the photic from the Base Station.

The AURA-LTM64 amplifier, with high sampling rate up to 3200 samples/second and integrated electrode input connections, is designed for use either as a bedside amplifier or as a wearable cabled-telemetry amplifier unit which allows the patient to have greater freedom of movement within their patient room. Provided accessories include a patient-worn pouch and 33-foot (10 m) patient cable. The integrated electrode input connections provides 64 AC inputs, 2 reference electrode inputs, and 2 ground inputs. Two amplifiers are connected for 128-channel recordings using a single link cable between them. Jack box labels are provided for labeling the inputs with international 10-20 and 1-64 numerical nomenclature, 10-10 nomenclature, and/or 65-128 nomenclature. The AURA-LTM64 64/128 amplifiers are modular and can be used with multiple recording systems.

When used for scalp recording, the amplifiers built-in electrode impedance meter can be activated via software from the recording PC, or by pressing the impedance button on the amplifier. The electrode connector inputs exceeding the user-defined impedance value will light up, making it easy for the technologists to identify which electrodes need attention. When used for invasive electrode recordings, the built-in impedance meter is disabled.

AURA-LTM64 amplifier system’s maximum possible sample rate is 3200 samples per second (64 channels) with a maximum possible bandwidth up to 1000 Hz*. Auxiliary inputs are also available for connecting a Patient Event pushbutton and an optional photic stimulator.

* The sampling rate and the storage rate is set by TWin software and available sampling rates are dependent on the TWin software version.