体外冲击波碎石焦点区域的时域有限差分法数值仿真

In extracorporeal shock wave lithotripsy (ESWL), high intensity ultrasonic pulse or shock wave is generated outside the human body, and focused via water to human body. Kidney and ureter stones are crushed by shock wave in focus, and discharged out of human body by urine. ESWL has come into wide use. However, when crushing stone in human body by ESWL, it often happens to complications, such as bloody urine hematoma and kidney explosion, one of the main factors is size, form, position of focal region and the sound pressure distribution in ESWL. This study analyzes ultrasonic pulse nonlinear propagation using ultrasonic nonlinear propagation simulation FDTD (Finite Difference Time Domain) method proposed before the author, according with the calculation model for Reichenberger’s practical ESWL, and simulates the process of ultrasound nonlinear propagation and sound pressure distribution of focus neighborhood, size, form, position of focal region and the influence by human tissues is studied.