An apparatus for generating focused acoustical pressure waves for therapeutical applications and, in particular, for destroying concrements, corporeal stone, etc. Various contaminants carried by the water become associated with the media bodies, thereby inhibiting water flow. The method further includes obtaining an acknowledging response from the storage device, multiplying the obtained acknowledging response, and sending respective acknowledgements to each source that initiated each respective \u201cwrite\u201d request. One catheter device includes a distal tube region having coolant delivery holes radially and longitudinally distributed along the distal region. The gates overlie the global bit lines with one or more insulating layers therebetween to provide adequate isolation between the gates and the global bit lines.