Fi-Wi Cannula

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  • The Fi-Wi Cannulas for chronic implantation into an animal's brain exist in Optoelectric, Opto, Ephys, or Test variety.
    The bottom of a Fi-Wi Optoelectric cannula consists of an optical fiber and 1 to 4 electrodes. The optical fiber glued to an LED illuminates a selected brain area, and electrodes record the area's brain activity. The LED light intensity pulse could be modulated from 0-100%. Its frequency can be varied from continuous wave (CW) up to 1 kHz. The optical fiber and the electrodes can be custom-positioned with 100 µm precision. The tungsten electrode impedance could be set between 0.2 and 1.2 MΩ.
    Fi-Wi Opto Cannula has a LED glued to a protruding optical fiber. At the same time, Fi-Wi Ephys Cannula features only electrodes. The Fi-Wi Test Cannula is a robust version of the Fi-Wi Opto Cannula with a larger diameter, short optical fiber used to verify the position of the illumination pattern before implanting the fragile Opto Cannula.
    At the top of the cannula is an electrical connector for attaching or disconnecting the headstage between the experiments.

  • Optical fiber - 200/250 µm - NA 0.66
    - 400/430 µm - NA 0.66
    LED power @ 150 mA
    * fibre 200 µm - NA0.66
    - 465 nm = 8.0 mW (250 mW/mm²)
    - 525 nm = 3.5 mW (110 mW/mm²)
    - 595 nm = 1.5 mW (50 mW/mm²)
    - 635 nm = 4.0 mW (130 mW/mm²)
    Electrodes (tungsten wires) - 25 μm diameter (0.7 to 1.2 MΩ)
    - 50 μm diameter, (0.2 to 0.3 MΩ)
    Dimensions 10 mm x 10 mm x 7 mm
    Mass 0.3 g
  • Fiberless and Wireless Optogenetically Synchronized Electrophysiology System
      User Manual
    FIWI Cannula
      Drawing