Table 2.

Summary of results on neural implant studies for sensory feedback restoration.

	Rossini et al., 2010	Raspopovic et al., 2014	Ortiz-Catalan et al., 2014a	Tan et al., 2014
Number of subjects	1	1	1	2
Experimental period	4 weeks	4 weeks	up to 16 months	up to 24 months
Electrodes	tf-LIFEs (thin-film Longitudinally-implanted Intra Fascicular Electrodes)	TIMEs (transversal intrafascicular multichannel electrodes)	Cuff electrode (Ardiem Medical)	FINE (flat interface nerve electrodes) Cuff electrode (Ardiem Medical)
Number of electrodes	4	4	1	Subject 1: 2 FINEs, 1 cuff Subject 2: 2 FINEs
Nerves	Median and ulnar nerves	Median and ulnar nerves	Ulnar nerve	Subject 1: medial and ulnar nerves Subject 2: medial and radial nerves
Trains of pulses	Rectangular cathodal pulses	Rectangular cathodal pulses	Single active charge-balanced biphasic pulse	Square electrical pulses
Frequency	10–100 Hz	50 Hz	8–20 Hz	10–125 Hz
Current	10–100 μA	maximum stimulation current: 240 μA (at 100 μs) for the index finger and 160 μA(at50 μs) for the little finger.	30–50 μA	1.1–2 mA
Pulse width	10–300 μs	–	–	24–60 μs
Charge	0.1–4 nC	Median nerve: 14-24 nC Ulnar nerve: 4-8 nC	100-180 μA	Subject 1: 40.7–95.5 nC Subject 2: 95–141 nC
Elicited hand areas	Figure 3A	Figure 3B	Figure 3C	Figures 3D–E
Grasping task	Power grip, pinch grip, little finger flexion	Palmar grasp, pinch grasp, ulnar grasp	Tripod grasp during arm oscillation, power grasp in different limb position