Device for supplying therapeutic gas, comprising: - an internal passage for conveying a flow of therapeutic gas between a gas inlet and a gas outlet, - valve means for controlling the flow of therapeutic gas in the internal passage, - control means comprising at least a microprocessor and configured to control at least the valve means, - a graphic display configured to display choices (9a-9d) that can be selected by a user, and - selection means comprising one or more selection keys configured to make a selection from among the selectable choices (9a-9d) displayed on the graphic display, characterized in that the control means are configured to: i. count a total number of patients treated by administration of the therapeutic gas from the selection, by a user, via the selection means, of a first given choice corresponding to the start of a treatment by administering the therapeutic gas to a patient concerned, said counting of the total number of patients treated being performed by incrementing a patients counter, ii. determine a total duration of treatment for each patient treated which corresponds to the period of time elapsed between the user selecting: - the first given choice corresponding to the start of a treatment by administering the therapeutic gas to a patient concerned, and - a second given choice corresponding to the end of the treatment by administering the therapeutic gas to said patient concerned, iii. determine, from the total number of patients treated, which has been counted up, and from the total treatment durations determined for the treated patients: - the number of short treatments for which the total treatment duration is below a preset threshold duration, and/or - the number of long treatments for which the total treatment duration is above said preset threshold duration, and iv. cooperate with the graphic display to display (11; 12) the total number of patients treated, which has been counted up, the number of short treatments and/or the number of long treatments, and wherein: - the graphic display comprises a touchscreen and the selection key or keys are virtual keys displayed on the touchscreen, and - the control means are configured to control the valve means and to start to supply therapeutic gas in response to a selection, by the user, of the first given choice, by pressing a virtual key displayed on the touchscreen and corresponding to the start of a treatment by administering therapeutic gas to the patient concerned, and to increment the total number of patients treated by +1 once the virtual key has been pressed. - an internal passage for conveying a flow of therapeutic gas between a gas inlet and a gas outlet, - valve means for controlling the flow of therapeutic gas in the internal passage, - control means comprising at least a microprocessor and configured to control at least the valve means, - a graphic display configured to display choices (9a-9d) that can be selected by a user, and - selection means comprising one or more selection keys configured to make a selection from among the selectable choices (9a-9d) displayed on the graphic display, i. count a total number of patients treated by administration of the therapeutic gas from the selection, by a user, via the selection means, of a first given choice corresponding to the start of a treatment by administering the therapeutic gas to a patient concerned, said counting of the total number of patients treated being performed by incrementing a patients counter, ii. determine a total duration of treatment for each patient treated which corresponds to the period of time elapsed between the user selecting: - the first given choice corresponding to the start of a treatment by administering the therapeutic gas to a patient concerned, and - a second given choice corresponding to the end of the treatment by administering the therapeutic gas to said patient concerned, - the first given choice corresponding to the start of a treatment by administering the therapeutic gas to a patient concerned, and - a second given choice corresponding to the end of the treatment by administering the therapeutic gas to said patient concerned, iii. determine, from the total number of patients treated, which has been counted up, and from the total treatment durations determined for the treated patients: - the number of short treatments for which the total treatment duration is below a preset threshold duration, and/or - the number of long treatments for which the total treatment duration is above said preset threshold duration, and - the number of short treatments for which the total treatment duration is below a preset threshold duration, and/or - the number of long treatments for which the total treatment duration is above said preset threshold duration, and iv. cooperate with the graphic display to display (11; 12) the total number of patients treated, which has been counted up, the number of short treatments and/or the number of long treatments, - the graphic display comprises a touchscreen and the selection key or keys are virtual keys displayed on the touchscreen, and - the control means are configured to control the valve means and to start to supply therapeutic gas in response to a selection, by the user, of the first given choice, by pressing a virtual key displayed on the touchscreen and corresponding to the start of a treatment by administering therapeutic gas to the patient concerned, and to increment the total number of patients treated by +1 once the virtual key has been pressed.