Experimental Study On Biological Heat Transfer Characteristics And Simulation Of Temperature Field Transmissio In Acupoint Tissue

Objective: 1.To observe the regular pattern of heat transfer between meridians and acupoints in the prosess of moxibustion;2.To explore the physical dose of moxibustion;3.To establish the dynamic model of propagation of temperature field in acupoint tissue;4.To sum up the physical properties and characteristics of the biological heat transfer of moxibustion.Methods: 1.The temperature change of Zusanli was detected by self-made highprecision temperature sensor while moxibustion on lower extremities acupoints on six meridians of foot in healthy volunteers for fifteen minutes,the temperature change curve and temperature change rate curve were drawn with Origin software;2.The physical dose of moxibustion on acupoints of different parts were established by defining the formula: the physical dose of acupoint =(instantaneous temperature before moxibustion + highest tolerable temperature)/2 * the time required to produce the highest tolerable temperature;3.A dynamic model of propagation of temperature field in acupoint tissue was simulated by ANSYS14.0 software.Results:1.Temperature change curve of Zusanli was the biggest when moxibustion on acupoints in stomach meridian of foot yangming,especially for Shangjuxu acupoint.Temperature change rate curves of Zusanli were basically in coincidence when moxibustion on lower extremities acupoints on six meridians of foot,and it had a downward trend.The temperature curves of Zusanli were changed significantly when moxibustion on acupoints closed to Zusanli on level and surface distance.2.Physics dose of acupoints on the yin meridian of hand and foot & chest and abdomen were fewer than that of acupoints on the yang meridian of hand and foot & dorsal and lumbar during moxibustion(P<0.05),and part of the physical dose of acupoints on the hand was lower than that of acupoints on the foot and the trunk(P<0.05).3.The analysis of the multidimensional temperature cloud map of the acupoint tissues at 5 minutes could be obtained that the heat of moxibustion was mainly conducted along the tissue surface to the inside,and the effect of moxibustion was becoming smaller and smaller as the increase of tissue depth;The analysis of three dimensional temperature model of acupoint tissues at 5 minutes,10 minutes,15 minutes and 20 minutes can be obtained that the temperature of the acupoint tissue rise and the depth of moxibustion’s heat increase further obviously with the increase of the time.Conclusion:1.Heat transfer between meridians and acupoints have propagated sensation along channel,consistency of transmission rate,regional characteristics and distance characteristics in the prosess of moxibustion.2.There is a certain range of physical dose of moxibustion on acupoints,and there are differences in the physical dose among acupoints at different parts.3.A dynamic model of propagation of temperature field in acupoint tissue is established,which reveals the characteristics of moxibustion including heat transfer(from near to far),the effects of diathermy(from the shallower to the deeper).