Abstract: A medical device is disclosed which, when a biological tissue is clamped by an expansion body, can adjust the pressing force applied on the biological tissue by an electrode portion to be appropriate. The present disclosure includes an expansion body, a shaft portion, and an electrode portion. The expansion body has a recess. The recess comprises a bottom portion, a proximal-side upright portion, and a distal-side upright portion. One of the proximal-side upright portion and the distal-side upright portion is provided with the electrode portion, while the other of the proximal-side upright portion and the distal-side upright portion is provided with a bifurcated outer peripheral portion, a back support portion which has a receiving surface and which is disposed inside the outer peripheral portion, and an arm portion which extends from the back support portion. The arm portion is connected to the outer peripheral portion.

Abstract: A guide wire, a medical device, and a medical method are able to achieve satisfactory workability and while ensuring safety by preventing a puncture needle portion from performing erroneous puncture. A guide wire for guiding a dilator to be inserted into a living body includes a shaft portion, a puncture portion fixed to a distal portion of the shaft portion, and whose distal side includes a needle portion for forming a hole in a biological tissue, and a deformable deformation portion fixed to the shaft portion or the puncture portion. The deformation portion located inside the dilator restricts deflection of the distal portion of the shaft portion.

Abstract: A medical device configured to suppress a thrombus from being formed and a method for controlling the medical device are provided. The medical device according to the present embodiment includes the expansion body configured to expand and contract in a radial direction; the elongated shaft portion including the distal portion including the proximal end fixing portion to which a proximal portion of the expansion body is fixed; the plurality of electrodes disposed along the expansion body; and the current supply unit that supplies a current to the electrodes, in which the expansion body includes the recessed portion recessed radially inward and defining the receiving space configured to receive a biological tissue when the expansion body expands, the plurality of electrodes are arranged along the recessed portion to face the receiving space, and the current supply unit is controlled to repeat supply and stop of a current to the electrodes.

Abstract: An inserter, a medical elongated body set, and a method of using an inserter can effectively remove air remaining inside a distal portion of a medical elongated body by effectively performing priming on the distal portion of the medical elongated body. An inserter assists a medical elongated body to be inserted into a medical device. The inserter includes a tubular portion having a proximal opening portion into which the medical elongated body is inserted and a distal opening portion that guides the medical elongated body to the medical device, and having a main lumen through which the proximal opening portion and the distal opening portion communicate with each other, and a connector that communicates with the main lumen of the tubular portion, and connects a liquid injection tool.

Abstract: A guide wire and a medical device are disclosed that have high workability, restrain erroneous puncture by a needle portion for puncture, and assure relative safety. A guide wire for guiding an elongated tubular body or dilator, and which is configured to be inserted in a living body. The guide wire includes a shaft portion, a puncture portion that is fixed to a distal portion of the shaft portion and that forms a hole in living body tissue, and a cover portion that is elastically deformable and that covers the puncture portion, in which when the cover portion is exposed from the elongated tubular body or dilator, the cover portion covers the puncture portion and the cover portion is bent.

Abstract: A guide wire, a medical device, and a medical method are able to achieve satisfactory workability and while ensuring safety by preventing a puncture needle portion from performing erroneous puncture. A guide wire for guiding a dilator to be inserted into a living body includes a shaft portion, a puncture portion fixed to a distal portion of the shaft portion, and whose distal side includes a needle portion for forming a hole in a biological tissue, and a deformable deformation portion fixed to the shaft portion or the puncture portion. The deformation portion located inside the dilator restricts deflection of the distal portion of the shaft portion.