充電式心臓ペースメーカを想定した低発熱非接触充電システムの試作

概要

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We studied an electric power transmission system for implanted medical devices, such as cardiac pacemakers. We examined improvements to transmission efficiency by reducing the eddy current loss of the titanium case and fabricated a prototype charger system that has 50% efficiency. The secondary rechargeable battery is charged outside the body. The eddy current loss heats through the titanium case and decreases transmission efficiency in an alternating magnetic field. We designed power transmission coils for a rechargeable cardiac pacemaker. The proposed secondary coil is located within the inner wall of the titanium case. The transmission efficiency was 26-40% at 10-20mm of gap. We examined improvements in transmission by changing the shape of the titanium case, using a magnetic field simulator. The eddy current loss in the divided model (two divisions) was 40% less than that in the basic model in one simulation results. We found the efficiency increased 40 to 50% at 10mm of gap by measuring the transmission efficiency of the divided model. We fabricated a prototype charger system based on our simulation results. The system achieved maximum efficiency of 50% after the battery was recharged.
社団法人日本磁気学会の論文
2008-01-01