Catheter to assist the performance of a heart

A device for assisting performance of a heart, comprising:

• a pump for conveying a fluid in one or more blood vessels;
• a control circuit configured to regulate a conveyed quantity of said fluid;
• and
• a heart ventricle catheter having one or more sensors in communication with the control circuit to supply measurement values indicative of cardiac output, wherein the control circuit is configured to regulate the conveyed quantity of said fluid as a function of said measurement values of the one or more sensors of the heart ventricle catheter, and wherein the pump is formed as an intravasal rotary pump on a periphery or at a distal end of the catheter, and a rotor of the pump is arranged on an outer side of the catheter and is connected via a magneto coupling with a drive which is arranged inside the catheter, wherein the rotor of the pump is coupled with a drive wheel via the magneto coupling, said drive wheel being arranged inside the catheter and formed as a hydraulically or pneumatically operated paddle wheel,
• a first lumen of the catheter supplying driving fluid to the drive wheel, and a second lumen of the catheter carrying off driving fluid from the drive wheel, wherein said first lumen and second lumen for the driving fluid are guided through an expandable balloon surrounding the catheter in a sealing manner, and said first lumen and second lumen each carry separately controllable closure members via which driving fluid moves into the balloon or moves out of the balloon into the respective first lumen and second lumen.