Improvement of wireless power transmission efficiency of implantable subcutaneous devices by closed magnetic circuit mechanism.
Induction coils were fabricated based on flexible printed circuit board for inductive transcutaneous power transmission. The coil had closed magnetic circuit (CMC) structure consisting of inner and outer magnetic core. The power transmission efficiency of the fabricated device was measured in the air and in vivo condition. It was confirmed that the CMC coil had higher transmission efficiency than typical air-core coil. The power transmission efficiency during a misalignment between primary coil and implanted secondary coil was also evaluated. The decrease of mutual inductance between the two coils caused by the misalignment led to a low efficiency of the inductive link. Therefore, it is important to properly align the primary coil and implanted secondary coil for effective power transmission. To align the coils, a feedback coil was proposed. This was integrated on the backside of the primary coil and enabled the detection of a misalignment of the primary and secondary coils. As a result of using the feedback coil, the primary and secondary coils could be aligned without knowledge of the position of the implanted secondary coil.
School of Mechanical Engineering, Yonsei University, Seoul, Korea.
Sung-Eun
SE
Jo
Sanghoon
S
Joung
Jun-Kyo Francis
JK
Suh
Yong-Jun
YJ
Kim
D017076:Computer-Aided Design; D011211:Electric Power Supplies; D004735:Energy Transfer; D019544:Equipment Failure Analysis; D008280:Magnetics / Q000295:instrumentation*; D019736:Prostheses and Implants; D011474:Prosthesis Design; D018511:Systems Integration; D059015:Wireless Technology / Q000295:instrumentation*