Heart assistance or back-up device

A device for the temporary circulatory assistance or back-up of the heart of a patient, comprising:

• a linear actuator configured to move a membrane in a chamber so as to cause a pulsating fluid flow adapted to support the activity of the heart of said patient, which flow is characterised by a succession of phases of aspiration and phases of ejection of the fluid,
• a control unit configured to pilot the actuator and control the movement of the membrane, which piloting is carried out while taking into account input data originating from an ECG signal of the patient,
• the control unit is configured to determine a time offset ΔT between the instant TR at which the QRS complex of the ECG signal is detected and the instant at which an ejection phase is initiated;
• wherein the control unit is further configured to determine, at each cardiac cycle identified in the ECG signal, the time offset ΔT by the following formula:
• Δ
• ⁢
• T
• =
• E
• +
• K
• .
• (
• F
• actual
• -
• F
• ref
• )
• wherein:
• E is a time value;
• K is a coefficient such that K>0;
• Factual corresponds to the measured heart rate of the patient;
• and
• Fref corresponds to a reference heart rate.