Neurosign V4
Neurosign has a reputation for producing simple reliable and cost-effective nerve monitors. Neurosign® V4 Intraoperative Nerve Monitor continues this tradition, but uses modern technology to deliver a 4 or 8-channel intraoperative nerve monitoring solution – helping surgeons to preserve that nerve!
3 key presses and you are running and ready!
Main unit
Screen 15” Colour LCD, 1024 x 768 pixels
Display
Bar graph range 30µV – 30mV peak to peak
Bar graph resolution 16 segments, logarithmic
Waveform amplitude ranges ±25µV, ±50µV, ±100μV (default), ±200µV, ±500µV, ±1mV, ±2.0mV, ±5mV, ±10mV, ±20mV, ±30mV
Accuracy 2% of FSD
Waveform time base ranges 12.5ms, 25ms (default), 50ms,
100ms, 500ms, 1s, 5s, 10s
Accuracy 2% 12.5ms-1s; 5% 5s; 10% 10s.
Time base cursor accuracy 2%
Software See “6.4. System Details” on page 47
Rotary actuators 3:
Left dial – 1. stimulator stimulation setting (STIM1)
Right dial – 2. stimulator stimulation setting (STIM2)
Centre dial – EMG response audio volume (Master Volume)
External connections EMG Amplifier Module (Pre-amplifier)
Trigger In
Trigger Out – Open Drain
Mute sensor
USB
EMG Audio 8.4W rms (95dBa @ 1m)
Stimulator pod
Primary Stimulator
Operational mode Constant Current or Constant Voltage
Current ranges 10µA – 10mA, in steps dependent on procedure.
Accuracy ±5%, into 1kΩ load
Voltage 10mV – 10V, in steps dependent on procedure.
Accuracy ±5%, into 1kΩ load
Voltage/current confirm ≥ 85% of set point
Stimulating pulse Square wave negative going
Width 100µs, 200µs (default), 300µs, 400µs, 500µs
Repetition frequency 3Hz, 30Hz
Probe connections 2
Secondary stimulator Not currently available – contact us for further information.
Pre-amplifier
Monitoring channels 4
Signal input range ±5µV to ±40mV
Common mode rejection ratio > 90dB (@ 50/60Hz)
Bandwidth 10Hz – 1kHz (-3dB points)
Noise <20µV rms (Input referred)
Notch filter 50Hz, 60Hz, off
General Specification
Power 100V-230V ~50/60Hz; 75VA
Dimensions 790mm wide, 400mm deep, 1600mm high
Weight 24Kg
Maximum load permitted 1.5kg
Total maximum weight 25.5kg
Environmental conditions:
Operational ranges:
Ambient temperature: 5°C to 40°C
Relative humidity: 10% to 80% (non-condensing)
Atmospheric pressure: 70kPa to 106kPa
Transport and storage ranges:
Ambient temperature: -19°C to 60°C
Relative humidity: 10% to 80% (non-condensing)
Atmospheric pressure: 50kPa to 106kPa
4 or 8 channel amplifier:
Software upgrade via SD card. Put the new software release on the card. Put it in the SD port of V4 and turn the system on. Automatic update will start and the system will restart after this. This can be done for system, amplifier and stimulator if needed.
