Tremor Monitor Unit

Tremor Monitor Unit II

Tremor Monitor Unit

The BrainStem Biometric’s Monitor uses a sensor which is placed gently on the closed eyelid of the patient.  The sensor, which contains a piezoelectric element, receives a signal which represents the eye tremor which is then processed and translated into a frequency measurement.  The signal processor contains filtering mechanisms to ensure clean transmission of the OMT reading.

This is important because of the normal gross eye movements and microsaccades that are constantly occurring.  Electromagnetic interference (EMI) and resulting signal artifacts are controlled using state-of-the-art thin film technology and signal conditioning circuitry.  Natural variability of OMT frequency from person to person as well as between age groups is small compared to the full range of signal spectrum. This system reports an objective value of oculomotor activity and the readings are unaffected by neuromuscular blocking agents.

“I've no doubt that going forward this technology will be the gold standard.” -- Ciaran Bolger, MD, PhD, Head of Clinical Neuroscience Royal College of Surgeons Ireland

Simple Non-Invasive Eyelid Sensor

A simple piezoelectric sensor adheres to the closed eyelid and obtains continuouys accurate readings during open eye awake and closed eye asleep states. This type of single-use contact sensor detects minute nano-meter scale mechanical movements of the eye and is reliable and inexpensive. Piezoelectric eye sensor is safe and effective and has been used on hundreds of patients for over 20 years.

  • Open and Closed Eye
  • Safe
  • Single Use
  • Reliable


Our simple non-invasive low cost disposable sensor system is based on 25 years of research, cleared by the FDA and demonstrated to be safe and effective in hundreds of patients worldwide.


Continuous Digital Display of OMT Signal

Two different but complementary aspects of the signal are available to the clinician in real-time:

– Arousal level (Green upper) is a measure of overall oculomotor activity and measured in frequency.
– Responsiveness (Red lower) is a measure of the brainstem’s ability to respond to stimulus, a function attenuated by sedatives, and measured in power of the response action.

The nature of illness in the ICU is very heterogeneous and patient needs can vary widely.  A patient with head trauma requires different sedation management than a patient recovering from surgery.  Targeted sedation goals for patients are difficult to achieve without an objective measurement.  A recent study showed that there is a discrepancy between perceived versus actual sedation practices for adults on mechanical ventilation in the ICU.  Clinicians overestimated the use of Daily Sedation Interruption (DSI) as well as monitoring patients for delirium. (Gill, 17)

It is widely accepted among critical care caregivers and administrators that a reliable tool for assessing sedation levels in the ICU is in great demand.  This will allow for goal-directed sedative delivery with the ability to tailor sedation dosing optimally for each patient.