What materials are used to make a cochlear implant?It is for an engineering report so i need materials i.e steel, ceramics etc.

Three parts of the cochlear implant are the transmitter,
the receiver and the electrode array.  The transmitter is comprised mostly of plastic
and some metal, the receiver is actually a small computer and is constructed of the same
material that most chips are made of, silicon, usually some metals including gold or
other very effective conductors to make a reliable processor for a small
chip.

The electrode array is actually composed of silicon
rubber and a very effective conductor such as platinum or other very effective
material.  The integrity of these parts is very important as they are inserted deeper
into the skull close to the cochlea.