Transducer mounting in lithotripter

In an extracorporeal lithotripter comprising a truncated ellipsoidal reflector open at one end, a rubber diaphragm closing said open end, said reflector having a first focus point within said reflector and a second focus point outside said reflector and beyond said diaphragm, said reflector having an axis of rotation which passes through both of said focus points, said reflector and said diaphragm comprising a volume filled with water, a pair of electrodes in said reflector and having ends in spaced relation providing a spark gap at said first focus point, an electrical spark between said electrodes across said gap producing a shockwave focused by said reflector on said second focus point, the improvement comprising an ultrasound transducer within said reflector and aimed toward said second focus point, and mounting means for said transducer adapted for quick and simple mounting of said transducer, said mounting means comprising a housing open toward said second focus point, said transducer being mounted in said housing, a plurality of arms extending substantially radially from said housing, each arm having an outer end, a plurality of anchor members respectively mounted on said arm outer ends, and a plurality of sockets in said reflector adjacent said open end and respectively receiving said anchor members to mount said transducer substantially at said reflector open end.