Wireless power transmission for implantable devices using inductive component of closed-magnetic circuit structure

An integrated flexible inductor is realized for wireless transcutaneous power transmission to implantable devices. Our method uses a mechanically flexible inductor which can be less invasively implanted in, or more easily attached to, the human body. The inductor pair is used for wireless power transmission. The primary inductor is attached on the patientpsilas skin and the secondary inductor is implanted under the subcutaneous tissue. The transmission efficiency depends on the induced magnetic flux on the secondary inductor. In order to achieve a closed magnetic circuit, a core material composed of 81% nickel and 19 % iron is used for concentrating a magnetic flux which is generated on the primary inductor and transmitted to the secondary inductor. Three kinds of flexible inductors were fabricated using flexible printed circuit board (FPCB) fabrication technologies. Transmission efficiency of each inductor was measured using a function generator and an oscilloscope.