EFFECTS OF SHOCK-WAVES ON LIVING TISSUES (NUMERICAL-ANALYSIS OF A PROPAGATING PRESSURE WAVE TOWARD LIVING TISSUE)

This paper describes pressure wave analysis in order to examine the ef fects of shock waves on living tissues. From the comparison of displac ements of living tissue models by FEM with that obtained by experiment s, dynamic properties of living tissue (rat's kidney) are determined. Using these properties of the living tissues in shock compression (sol id-state equation), the flow fields in two layers that consist of air and the living tissue, and in three layers that consist of air, water, and living tissue are numerically obtained. It is found that the inci dent time derivative of pressure in the living tissue is smaller than that of pressure in air and water. Hence, the effect of the living tis sue depends on the relaxation of pressure waves and duration of exposu re.