Ultra sound examining device

An ultra sound examining device, particularly for medical purposes, operating according to the impulse-echo process, said device comprising an ultra sound sending and receiving system having an ultra sound sender and a receiver, a precursor stretch, such as water delay coupling means connected to the front of said ultra sound sending and receiving system, an echo impulse representation device, such as a cathode ray tube, and an actuating means connecting said ultra sound sending and receiving system with said echo impulse representation device, wherein said ultra sound sender comprises energizing means for energizing said sender to transmit successive impulses which are spaced in time from each other by a value which is smaller than the sum of the precursor time of ultra sound impulses in the precursor stretch and the representation time of echo impulses on the representation device, but the smallest value being not less than the representation time, and wherein said actuating means actuate said echo impulse representation device depending upon transmitted impulses of said ultra sound sender to visually represent echo ultra sound impulses produced by a transmitted impulse always during time of travel of next successive sent impulse in said precursor stretch, wherein said energizing means comprise a sweeping oscillator for frequency-modulating repetition frequency of transmitted impulse of said ultra sound sender, said actuating means comprising at least two monostable multivibrators connected in parallel between said ultra sound impulse sender and said echo impulses representation device, said monostable multivibrators being triggered alternately by successive transmitted impulses and producing, when triggered, an output impulse, said output impulse having the duration of the precursor time and at its end actuating said echo impulse representation device to visually represent echo impulses.