The thermal performance of biological tissue under moxibustion therapy.

An understanding of the thermal performance of biological tissue under moxibustion with ash cleaning and distance adjustment (ACDA) is helpful for the optimization and standardization of moxibustion clinical treatment. This study compared surface temperature distribution of burning moxa stick with and without ash cleaning. The experimental of moxibustion treatment on in-vitro tissue and human abdomen were conducted and corresponding numerical models were developed. The effect of ACDA on thermal performance of biological tissue under moxibustion therapy were analyzed. The results show that the surface temperature of burning moxa stick with ash cleaning maintained at a higher range compared to that without ash cleaning. During moxibustion with ACDA process in in-vitro tissue experiment, the temperature increase (ΔT) at skin surface almost fluctuated in the same temperature range, and the ΔT in subcutaneous tissue (>11 mm) kept increasing. Relatively, these ΔT under moxibustion treatment without ACDA showed different trends and these values were all much smaller than those with ACDA. In addition, the position of maximum temperature of tissue under moxibustion with and without ACDA was fixed on treatment acupoint and moved away from treatment acupoint, respectively. Besides, the surface temperature of human abdomen tissue under moxibustion treatment with ACDA can be maintained at 46 °C-50 °C for a longer time compared to that under moxbustion without ACDA. In conclusion, moxibustion with ACDA can create a larger and more durable thermal effect on biological tissue. The results also suggest that ACDA may be helpful to improve moxibustion therapy efficacy in clinic treatments.