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Inside the pump a rotor rotates in a range between 5000 to 10000
rpm. This axial rotor is solely held in position by magnetic bearings.
This is what makes the left ventricular assist device unique,
worldwide. Due to the magnetic suspension, there is no friction and
thus no generated heat. Theoretically the pump can run endless and is
also absolutely soundless.
The
blood coming from the heart flows into the axial pump and passes the
inflow guide vane. The specially arranged blades make sure that the
blood flows into the rotor. An outflow guide vane behind the rotor then
takes spinning movement out of the blood, additionally building up
pressure and channels it through the outflow cannula into the aorta.
The necessary electricity for the pump driver is conducted through a
small cable, which is lead through the skin on the right side. The
cable is connected to a small control unit. The control unit monitors
and controls the entire system. Connected to the control unit are the
main and the reserve batteries, which supply the system with
electricity.
Control unit and recharged batteries are constantly to be with the patient in a carrier bag.
Several
signals inform the patient about the operating status and for instance
might advise him to change the rechargeable battery.
