System 2000 Comprehensive Rotational Chair

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System 2000

Comprehensive Rotational Chair

System 2000™ is our traditional rotational vestibular chair that is the gold standard for testing patients with dizziness. This chair features a dark room enclosure for eyes uncovered recording, an XY laser projector for testing in both horizontal and vertical directions, a static subjective visual vertical test, and a full-field optokinetic drum that projects stripes from the floor to the ceiling.

The System 2000 is used for testing and monitoring patients with peripheral vestibular loss, dizziness, vertigo, acoustic neuroma, chronic imbalance, eye tracking abnormalities and other vestibular disorders.

Adding a child car seat option with pediatric goggles and EOG electrodes extends testing of VOR function to children who are candidates for cochlear implants or children who have balance or motor developmental issues. Patients who are not candidates for caloric tests or those who need to be followed to document vestibular compensation are appropriate for the System 2000 comprehensive rotational chair.

System 2000 Comprehensive Chair Features

Motor and Servo controller
The System 2000 Comprehensive Rotational Vestibular Chair smoothly accelerates and changes direction without inertial artifact even at higher frequencies and with heavier patients. The dc torque motor in the base and the linear servo amplifier were engineered to provide quiet, precisely controlled rotation in patients up to 400lbs. The complete system can be installed in a traditional 10ft x12ft exam room without expensive AC power modifications or room renovations.

XY Laser Projector
A focused solid state laser with precise, dual galvanometers produces a red dot on the booth wall for gaze, pursuit, and saccade tests in both the vertical and horizontal directions. For subjective visual vertical (SVV) tests these XY galvanometers oscillate rapidly to draw a red line on the booth wall. As a measure of static otolith function, via the perception of verticality, the patient tells the examiner to rotate the laser line left or right until it appears to be vertical. For patients who have difficulty sitting up straight due to back or neck issues, there is a forward adjustable head support with an integral distance ruler to correctly set the laser calibration angle.

Booth Enclosure
To prevent patient orientation and for testing in complete darkness, a rotational chair booth is part of the system. Communication with the patient takes place with a 2-way intercom and infrared video monitoring. The booth has ventilation fans for patient comfort and LED lighting that can be used when the patient is not rotating.

Optokinetic Drum
A true optokinetic stimuli must fill the patients visual field. Only a full-field projector can create a perception of self-motion in subjects who stare at the stimuli as it rotates around them. A pinpoint of intense light in the center of the optokinetic drum projects clear stripes on the booth wall from floor to ceiling filling the patient’s entire visual field. These stripes are rotated by a servo motor for OKN tests and the stripes are stationary for vision-enhanced VOR tests.

Binocular Video Goggles
Prior to testing, binocular goggles are placed on the patient’s face, both eye images are adjusted for clarity of image, a Velcro strap connects the goggles to the head support for head stability. Then via software, the eye images are centered on the computer screen. During testing, even when the patient slouches in their chair or sits straighter, the eye images can be centered and the tracking adjusted from the computer keyboard without re-entering the booth. These goggles features improve trace quality and also reduce testing time.

System 2000 Comprehensive Chair Options

  • Pediatric option includes a monocular child’s size video goggles, chair mounted patient observation camera, and infant car seat.
  • EOG electrode amplifier on the chair is an alternative for patients who cannot wear the video goggles, have eye blinking artifacts, or children.
  • VNG is available for adding caloric, gaze, positional, Hallpike and other nystagmus tests using the same computer and goggles but with a VNG exam table in the same room as the booth.
  • Vorteq for testing higher frequency VOR function