Novacor II LVAS
How it Works
Operation
The Novacor II LVAS operates using two strokes:
- Pumping stroke, during which the pre-chamber fills and the pumping chamber ejects
- Transfer stroke, where the blood flows from the prechamber into the pumping chamber
The Novacor II LVAS is magnetically driven. This allows for simple operation with no wearing elements or precision components. Its controlled sac deformation introduces no extra stress compared to previous Novacor products. The driver produces a defined force profile with controlled dP/dt, limiting loads on the valves.
Pumping Function
Blood enters the Novacor II LVAS pump through an inflow conduit connected to the recipient's left ventricle. The pump ejects blood through an outflow conduit into the arterial system, thereby supporting the systemic circulation. Because of the device's unique dual-chamber design, the system can operate without a volume compensator or venting through the skin. The system is completely self-regulating, automatically adjusting its output in response to recipients' changing circulatory requirements.
Power and Control
The Transcutaneous Energy Transfer system (TETs) transfers energy across the intact skin, from the external rechargeable power pack to the implanted controller. The elimination of any wires or tubes through the skin reduces the potential for infection. The controller regulates the pumping action of the LVAS, and monitors system function. The controller incorporates a rechargeable battery to support temporary operation without the external power source, facilitating bathing or swimming.
Availability
WorldHeart's Novacor II LVAS is not currently available.
In 2005, WorldHeart conducted the first animal implant of the Novacor II LVAS - ahead of schedule.
