MEDICAL DEVICE AND SHUNT FORMATION METHOD

To provide a medical device, even when a biological tissue to be cauterized is uneven, capable of appropriately cauterizing it by effectively bringing energy transfer elements into close contact with the biological tissue, and provide a shunt formation method.SOLUTION: A medical device 10 comprises an expansion body 21, a shaft part 31 to which a base end of the expansion body 21 is fixed, and a plurality of energy transfer elements 22 provided along the expansion body 21. The expansion body 21 includes a recess 55 recessed inward in the radial direction. The recess 55 includes a distal-side upright part 72, a proximal-side upright part 73, and a bottom part 71 so as to define a receiving space 74 capable of receiving a biological tissue. The plurality of energy transfer elements 22 have flexibility to be deformable by force received from the expansion body 21 and disposed along the proximal-side upright part 73 so as to face the receiving space 74. At least a part of each of the plurality of energy transfer elements 22 has a convex surface part 100, the surface of which facing the receiving space 74 becomes a convex curved surface shape when being expanded.SELECTED DRAWING: Figure 2 【課題】焼灼する生体組織に凹凸があっても、エネルギー伝達要素を生体組織に効果的に密着させて適切に焼灼できる医療デバイスおよびシャント形成方法を提供する。【解決手段】医療デバイス１０は、拡張体２１と、拡張体２１の基端が固定されたシャフト部３１と、拡張体２１に沿って設けられる複数のエネルギー伝達要素２２と、を備え、拡張体２１は、径方向内側に窪んだ凹部５５を有し、凹部５５は、生体組織を受容可能な受容空間７４を画成するように、先端側起立部７２と、基端側起立部７３と、底部７１と、を有し、複数のエネルギー伝達要素２２は、拡張体２１から受ける力によって変形可能な柔軟性を有し、受容空間７４に面するように基端側起立部７３に沿って配置され、複数のエネルギー伝達要素２２の各々の少なくとも一部は、拡張時に受容空間７４に向かう面が凸状の曲面形状となる凸面部１００を有する。【選択図】図２