In this research, heat-acupuncture needle was coated with Al₂O₃ by applying a plasma spray coating method to prevent a skin burn. Al₂O₃, which is one of the representative bioceramics, does not have an influence on the chemical change in the body system. The ceramic coating thickness was about 100 μm. The experiments of heat conduction were performed for uncoated needle and coated needle. The results showed that the surface temperature of needle decreased as the needle was coated with Al₂O₃. The surface temperature of uncoated needle was about 48°C, while that of needle coated with Al₂O₃ was about 39°C.
