We have developed a unique Coplanar Energy Transfer (CET) system (Leviticus Cardio) which is a wireless energy transmission system to implantable Ventricular Assist Devices (VADs). Based upon previous successful in vitro testing, we have now tested the system in vivo. The CET system contains 3 parts: - The external gear (rechargeable batteries and an external controller attached to a belt, carrying a transmitter coil) - The implantable internal system ( receiver antenna, a small rechargeable battery, and a miniature controller) - The operator system enables programming and data acquisition using a tablet computer. The CET main features are: 1. Stable transmition and alignment over time despite animal rigorous movements 2. Prolonged internal battery operation The CET system was implanted in 5 pigs: in 3 pigs the Jarvik 2000 VADs were connected to the left ventricle and operated for 2, 9 and 24 hours, and in 2 pigs the HeartMate II LVADs were mounted on the animals’ back with an external mock circulation for up to 1 week. Energy transmission was stable in all animals with no alignment interference (graph 1). While removing all external gear for 6-9 hours at 9000 RPM’s the power starts dropping, however, the LVAD was still operating successfully (Graph 3). Following reconnection the power returns to baseline levels (Graph 2). The fourth graph shows both observed and calculated times of freedom from external gear in different VADs. The latest experiments demonstrated stable energy transfer for up to 1 week until the experiment was terminated. The CET system is reliable and consistent thus providing high safety profile. Patients will not be troubled with malalignment, and enjoy prolonged internal battery operation that allows for more than 6 hours of freedom from external gear.