PROBLEM TO BE SOLVED: To provide a trocar that wirelessly supplies electric power to a treatment instrument via an AC magnetic field and that hardly generates a leaked magnetic field.SOLUTION: A trocar 10 includes: a casing 14 having an insertion hole 10H for inserting a treatment instrument 30 into the body of a subject 9 a power transmission coil 11 which is arranged on an outer peripheral part of the insertion hole 10H and which generates an AC magnetic field and a shield member 12 which is arranged on at least one of the upside and downside of the power transmission coil 11, which includes a soft magnetic material and which surrounds the insertion hole 10H.COPYRIGHT: (C)2015,JPO&INPIT【課題】交流磁界を介して処置具にワイヤレス給電する、漏洩磁界の少ないトロッカーを提供する。【解決手段】トロッカー10は、処置具30を被検体9の体内に挿入するための挿入孔10Hのある筐体14と、挿入孔10Hの外周部に配設された交流磁界を発生する送電コイル11と、送電コイル11の上側または下側の少なくともいずれかに配設された、軟磁性材料を含み、挿入孔10Hを取り囲むシールド部材12と、を具備する。【選択図】図1
