Prototype Head Fixture

The following photograph shows our first assembled fiber and cannula Head Fixture, following the design we presented earlier. The small ruler graduations are 0.5-mm. The fiber diameter is 300 μm.



Part (4) is the fiber, one end of which is glued with clear optical epoxy to an EZ500 LED mounted on the circuit board. This fiber is a dummy we used to make a prototype head fixture. Its tip is sheared off at an angle instead of tapered with a flame.

Part (1) is the L+ lead from an Implantable Lamp (A3024A). Part (2) is the connector pin on the end of the L− lead from the same device. These pins plug into two sockets on the Head Fixture. Part (3) is the L− socket. The L+ socket is obscured by L−. Part (8) is the head fixture circuit board. Part (5) is a silica guide cannula. Part (6) is the threaded pedestal on the guide cannula. Part (7) is a smoothing capacitor to reduce noise induced in EEG recordings.