This study validated and characterized the suitability of transcutaneous energy transfer (TET) to power a novel low-power intra-aortic micro-axial entrainment pump for long-term partial circulatory support. During long-term use, indwelling power leads represent a significant infection risk. A TET system eliminates this risk by transferring power across the skin through inductive coupling. During the study, key design questions were answered and operating requirements and performance parameters were characterized. The TET system comprises a Class-E power amplifier with a self-oscillating feedback network and a two-way telemetry system. The system autotunes transfer frequency and power output to optimize efficiency and minimize power consumption. Output current and voltage of the TET system were measured over a range of distance and coil orientations. Major system components are shown in Fig 1. The developed system demonstrated capability to transfer sufficient power over several centimeters and a range of coil orientations to drive the pump and simultaneously charge an implantable reserve battery. The battery powers operation during temporary coupling loss of up to an hour, allowing a full range of user activity. The TET system can also transmit various control signals to the device and receive biological and system performance data from the device. The latter is used to optimize transfer frequency and power consumption. This study demonstrates that the developed TET system may be suitable for long term use under practical real world constraints. System design and performance should allow for a high quality-of-life for users in everyday situations.