  Development of dry, ultra-conformable and unperceivable temporary tattoo
electrodes (TTEs), based on the ink-jet printing of PEDOT:PSS on top of
commercially available temporary tattoo paper, has gained increasing attention
as a new and promising technology for electrophysiological recordings on skin.
In this work we present a TTEs epidermal sensor for real time monitoring of
respiration through transthoracic impedance measurements, exploiting a new
design based on the application of soft screen printed Ag ink and magnetic
interlink, that guarantees a repositionable, long term stable and robust
interconnection of TTEs with external docking devices. The efficiency of the
TTE and the proposed interconnection strategy under stretching (up to 10%) and
over time (up to 96 hours) has been verified on a dedicated experimental setup
and on humans, fulfilling the proposed specific application of transthoracic
impedance measurements. The proposed approach makes this technology suitable
for large-scale production and suitable not only for the specific use case
presented, but also for real time monitoring of different bio-electric signals,
as demonstrated through specific proof of concept demonstrators.
