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Evaluation of roller-type itch-relief device employing hot and cold alternating stimuli

An itch is a significant problem for many diseases and relief of itch without side effect is required. We focused on the fact that painful thermal stimulation inhibits the itch sensation. Based on two well-known phenomena, thermal grill illusion and synthetic heat, which can generate pain or burning sensation without physical damage, we tried to achieve similar effect with harmless-range thermal stimulation.We developed a roller-type itch-relief device. The roller is composed of two parts. One part is set hot and the other is set cold by embedded Peltier devices. When the device is rolled on the user's skin, the skin is exposed to hot and cold stimuli alternatively. We also evaluated the elicited sensation and confirmed that it could partly deliver pain sensation.