Neurosign 400/800

The Nerve Monitor – Powerful yet simple monitoring


Neurosign 400

Neurosign 400 is intended for neurosurgery, otology, and maxillofacial and general ENT surgery, allowing the surgeon to identify and locate delicate neural tissue with precision. With 4 channels, the Neurosign 400 provides greater monitoring capacity than the Neurosign 100 and offers surgeons increased precision for monitoring the facial nerve. Neurosign 400 has a proven track record of providing important information to the surgeon during a variety of surgical procedures.

Neurosign 800

The Neurosign 800 is an 8 channel EMG monitor. It is intended to be used to monitor multiple cranial nerves and spinal nerve roots.

The Neurosign 800 is used to monitor multiple cranial motor nerves; for example, during acoustic neuroma excision the Neurosign 800 can be used to monitor 4 branches of the facial nerve, together with the trigeminal, glossopharyngeal, vagus and accessory nerves.

It is important to monitor the facial nerve thoroughly. Experience has shown that it is not always adequate to use 2 channels to monitor the nerve; in tumours where the nerve is stretched it can become very thin and played out, so that its fibres cover a large area. By using just 2 channels, only a proportion of those fibres are monitored, resulting in potential damage to part of the nerve. By using 4 channels, more of the nerve is covered.

The additional channels also allow the user to monitor other important neural structures during the removal of acoustic neuromas and meningiomas. The trigeminal, glossopharygeal and accessory nerves are all easily monitored using needle electrodes; the vagus can be monitored using the laryngeal electrode (soon to be available in the USA).

The Neurosign 800 can also be used in spinal procedures, to monitor the spinal nerve roots during the placement of pedicle screws, spinal instrumentation, the release of tethered cord, the removal of spinal tumours, especially in the cauda equina, and as an aid during scoliosis correction.



Neurosign 400

  • 4 EMG channels
  • powerful audio gives instantaneous feedback to the surgeon
  • stimulator range 0.05mA to 5mA or 0.05V to 5V
  • switches on in the same state it was turned off, with all the user’s settings saved.

Neurosign 800

  • 8 EMG channels
  • powerful audio gives instantaneous feedback
  • stimulator 0.05mA to 5mA, 0.05V to 5V (cranial); or 0.5mA to 10mA, 0.5V to 10V (spinal)
  • data may be dumped to PC
  • may be externally triggered for connection to electrical and magnetic stimulators