| 摘要 |
Process for converting unipolar acoustic impulses or shock waves produced by suitable shock wave sources into bipolar acoustic impulses to produce inverse N-waves comprises reflecting the unipolar impulses/shock waves on a boundary layer medium (2) consisting of a material having a thickness that is greater than the signal length of the acoustic impulse and having an acoustic impedance which is distinctly different to the impedance of the propagation medium (4) and that of the adjoining medium. An Independent claim is also included for a device for carrying out the above process consisting of a therapy head with an electromagnetic shock wave source having a conventional reflector. Preferred Features: The boundary layer medium has a two-layered structure consisting of a thin rubber layer (9) and a thin aluminum layer, each 100 mum thick. An almost gas-filled intermediate chamber (10) is provided, e.g. a thin air layer or a medium with hollow chambers, e.g. fiber-like paper or porous foamed material. |
