Damping, amplitude, aging tests of stacked transducers for shock wave generation

摘要: New clinical concepts in lithotripsy demand small shock heads. Reducing the size of piezoelectric heads will be possible only if pressure generated at surface each transducer can increased so that total focus remains same. To solve this problem, different solutions were proposed. For example, it has been demonstrated piezocomposite material, as opposed to piezoceramic allows generation a higher before breaking, mainly because radial modes are dramatically reduced. In addition, previous paper, we showed feasibility generating high-pressure pulse waves without increasing voltage by using sandwiched transducers, which stack two or more transducers. Some discrepancies appeared, however, between measured front and arithmetic sum pressures constituting stack. fact, development such stacked transducers capable range 2 5 MPa is very complex, may explain why no aging tests have reported literature thus far. first part theoretically determine importance electroacoustical coupling on pressure. We show losses due these couplings less than 5%. Experimental measurements done assembled tightened castor oil-filled tank excellent accordance with theoretical measurements. Using assembly technique, was obtain, average, out four elements, 7.5 for duration 4 million shocks, would allow treatment approximately 1000 patients.