a process for making a biosensor comprising a hollow coil having wires coiled in parallel and an electronic circuit component connected to the coil , the process including : 1 ) providing a mandrel on which wires including at least a first wire , a second wire and a third wire are wound in parallel , 2a ) immersing the mandrel in a first buffer solution comprising a first bioreceptor , a first monomer and optional additives , 2b ) arranging the wires such that the first wire may be used as a working electrode , the second wire may be used as a counter electrode and the third wire may be used as a reference electrode of a three electrode electrochemical cell used in an electropolymerisation process , 3 ) passing electric current through the first wire to form a first biocompatible coating of a first polymer polymerized from the first monomer comprising the first bioreceptor on the first wire , 4 ) removing the coil from the mandrel , 5 ) connecting the wires to their respective points of the electronic circuit component such that the first wire may be used as a working electrode , the second wire may be used as a counter electrode and the third wire may be used as a reference electrode and wherein the electronic circuit component is configured such that it can generate an input signal for a wireless receiver based upon the activity of the bioreceptor and wirelessly send the input signal to the wireless receiver .