**Table 1.**

*Classification of implantable electronic devices.*

3. Implantable artificial organs, like artificial heart.

4. Implantable medical devices, like drug pump.

They have many other advantages, apart from the functions of these devices. It is possible to obtain test data without skin interference, which can reduce skin/ device interaction. They can help cure diseases with external devices, for example Parkinson's and the normal organs such as heart, retina and cochlea can be changed with implanted devices. The most efficient approach is direct contact with organs.
