Catheter to assist the performance of a heart
In a catheter ( 2 ) to assist the performance of a heart ( 1 ) with at least one pump ( 7 ), the pump is formed as a rotary pump at the distal end of the catheter ( 2 ), the rotor ( 6 ) lying distally on the outer side being coupled via a magneto coupling with a drive wheel ( 21 ), formed as a hydraulically or pneumatically operated paddle wheel, arranged inside the catheter ( 2 ). The driving fluid is supplied to the paddle wheel via a lumen ( 22 ) of the catheter ( 2 ) and is carried off via a further lumen ( 23 ) of the catheter.
1. 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.
2. The device of claim 1 , wherein the closure members are formed as magneto valves.
3. The device of claim 2 , wherein an axis of rotation of the rotor is generally parallel to a longitudinal axis of the catheter.
4. The device of claim 1 , wherein the magneto coupling is formed of bar magnets, said bar magnets being arranged in adjacent chambers, separated from each other by a sealing wall, at the distal end of the catheter,
a first one of said bar magnets is connected with the rotor so as to be locked against relative rotation with respect to the rotor, and
a second one of said bar magnets is connected with the drive wheel so as to be locked against relative rotation with respect to the drive wheel.
5. The device of claim 4 , wherein a first connection between said first bar magnet and the rotor is mounted in a wall of its respective chamber facing away from the sealing wall and facing toward the rotor, and a second connection between said second bar magnet and the drive wheel is mounted in a wall of its respective chamber facing away from the sealing wall and facing toward the drive wheel.
6. The device of claim 1 , wherein the drive wheel comprises axial or semi-axial blades.
7. The device of claim 1 , wherein an axis of rotation of the rotor is in alignment with a longitudinal axis of the catheter, or is parallel thereto.
8. The device of claim 1 , wherein the rotor comprises guide surfaces to produce centrifugal flow components.