Linear Current Isolator

Linear current source with high precision. Isolate and scale any signal that you generate. Charge Balanced Stimulation.

Soterix Medical Linear Current Isolator Device

Soterix Medical introduces the best in class current source which can isolate and scale any signal you create. The Linear Current Isolator (LCI) can be used for a variety of physiological stimulation protocols. Its high input impedance and high common mode voltage prevents ground loop. With high bandwidth and high voltage slew rate, it can be used for high frequency stimulations or sharp waveforms. The LCI has un-matched DC accuracy and provides option for charge balanced stimulation to compensate the DC offset of function generators. The LCI includes an unique selectable feature that can remove DC offset of output. This ensures stimulation without causing harm to tissue or corroding electrodes. The LCI is easy to use and has a simple user interface and requires minimal maintenance due to an error detection system, internal calibration, and advanced power management.

Charge Balanced Stimulation

In order to deliver charge balanced stimulation, device is required to sink the exact same amount of charge that is delivered to the tissue. Function generators or DACs which can be used to command the current source, have DC offset at the output. Even a small amount of offset at the device input, cause current leakage at output, which will be accumulated after multiple cycles and cause electrode corrosion. This feature subtracts DC value from input signal.

DC Offset Removal

Connecting current source to electrodes in saline cause DC voltage offset at electrodes. The tissue and electrodes are sensitive to even less than 1 V. DC offset removal monitors the output voltage and keeps the DC offset at 0 V during stimulation. The mechanism of removing DC offset, is to subtract the DC value from command.

Selectable Gain

The device is equipped with two different feedback networks, one provides 1 mA at output per 1 V of input command, and the other converts 1 V of input command to 100 μA of current at the output. Changing current gain does not cause any surge at the output unlike other isolated current stimulators.

Unique Features

Minimum 0.03% ( 1mA/V); Minimum 0.02% (100 uA/V)

Slew rate (11 V/us) ; Input to Output propagation delay (600 ns)

Shielded to reduce noise

Simple and obvious to use controls

Main Specifications

Input Range

+/- 10V

Input Impedance

47 kohm

Input Connector

BNC

Selectable Gain

1 mA/V and 100 uA/V

Output Compliance Voltage

+/- 34V

Output Impedance

>60 Mohm

Bandwidth (-3dB)

440 kHz ( Input: 2 Vpp sine; load: 1 kohm)

Battery

Li-ion (rechargeable) / 1200 charge discharge cycles

Run time

4 hours of continuous stimulation at 1 mA output current

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