Fi-Wi Cannula

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  • The Fi-Wi Cannulas for chronic implantation into an animal's brain can be Optoelectric, Opto, Ephys, or Test type.
    The bottom of a Fi-Wi Optoelectric cannula has a protrusion consisting 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 tolerance. The tungsten electrode impedance could be set between 0.2 and 1.2 MΩ.

    Fi-Wi Opto Cannula has no electrodes, while Fi-Wi Ephys Cannula is without LED and optical fiber. The Fi-Wi Test Cannula is a robust version of the Fi-Wi Opto Cannula with a large diameter, short optical fiber. It is used to verify the illumination patterns before implanting the fragile Opto Cannula.

    At the top of the cannula is an electrical connector for attaching the headstage. The headstage is easily disconnected and reconnected from the cannula 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
  • FIWI-OE System-Manual
      Version 2.0.1
    FIWI Cannula-Drawing