Fig. 5

Wireless device composed of intramuscular electrodes and miniature electronic circuit. a Top: circuit board (length: 10 mm; width: 8.5 mm), with four headers for their connection to the four electrode contacts of the intramuscular electrodes. Bottom: lateral view of the circuit (height: 2.4 mm). b Final conformation of the wireless device, including intramuscular electrodes and capsule protecting circuit. The guiding filament of the electrodes is inserted in the lumen of the insertion needle. c Circuit housed in a polymer capsule, connected to the intramuscular electrodes using a small PCB. d Image of rabbit’s hindlimb with two wireless devices implanted in the tibialis anterior and gastrocnemius medialis muscles. e Basic architecture of the wireless circuit shown in (a)