Apparatus for regulating the breathing pattern

Portable apparatus for regulating the breathing pattern of patient, in particular as a remedy against the hyperventilation syndrome, comprising a sensor adapted to be attached to the body of the patient, said sensor including means responsive to the contractions and expansions of the chest for producing sensor output signals, means connected to said sensor for converting the output signals of said sensor into short control impulses of which the repetition frequency is equal to the breathing frequency, timing means adapted to deliver an output signal after elapse of a predetermined time interval and having a reset terminal, means connecting said signal convertng means to said reset terminal for supplying said control impulses to said reset terminal so that said timing means only provides output signals if the breathing frequency is below a prescribed limit frequency, tone generator means connected to said timing means for alternately producing two audible tones having a different character, means for rendering said tones perceptible to the patient connected to said tone generator means, and means connected to said timing means for preventing the operation of said tone generator means connected to said timing means when the ouput signals of said timing means occur regularly.