Abstract: A medical device for crushing an object in a body lumen, the medical device including: an elongated shaft portion rotatably driven; a crushing unit provided with bendable wire rods and rotatable together with the shaft portion; and a sliding unit fixed to each of end portion of the wire rods on at least one of a distal side of and a proximal side of the wire rods and is interlocked with the shaft portion so as to be slidable in an axial direction of the shaft portion. The shaft portion is provided with contact portions that come into contact with the sliding unit during rotation and limit relative rotation of the shaft portion and the sliding unit. After the sliding unit is attached to the contact portions, the sliding unit rotates in the same direction as the shaft portion along with the rotation of the shaft portion.

Abstract: A medical device is disclosed, which is capable of treating lymphedema and reducing a reoccurrence rate after treatment. The medical device includes a tube member that includes a first end portion connected to a first body lumen L and a second end portion connected to a second body lumen P and a pressure-feeding unit that pressure-feeds a body fluid in the first body lumen to the second body lumen.

Abstract: A medical device and a treatment method are disclosed that can be applied to body lumina with a wide range of inside diameters and can enhance a property for suction of a substance from the inside of a body lumen by restricting flow within the body lumen. The medical device includes an elongated shaft section; an expanding section that is an elastically deformable tubular body provided with a plurality of openings; a flexibly deformable tubular cover section that is coupled to an end portion on a proximal side of the expanding section, surrounds an outer periphery of the expanding section on the proximal side, but does not surround, and externally exposes, an outer periphery of the expanding section on a distal side; and a sheath capable of accommodating the expanding section and the cover section in a diameter-reduced state.

Abstract: Provided is a medical device designed to be inserted into a lumen of a living body, the medical device including: a long shaft part; and a cylindrical hollow body. The shaft part has a center axis at position which differs from a center axis of the hollow body on a cross section perpendicular to the center axis of the shaft part. The hollow body has a housing part extending along the center axis of the hollow body, the hollow body being a groove depressed from an outer peripheral surface to an inner peripheral surface or a slit penetrating from an outer peripheral surface to an inner peripheral surface. The shaft part is positioned between inner surfaces facing from the outer peripheral surface to the inner peripheral surface in such a way that at least a portion of the shaft part constitutes the slit or the groove of the housing part.

Abstract: A medical device designed to be inserted into a lumen of a living body so as to block a flow of fluid in the lumen of the living body. The medical device includes: a long shaft part; an expandable part; and a covering part. The expandable part is an elastically deformable cylindrical body, and the cylindrical body having a proximal part connected to the shaft part. The covering part takes on a cylindrical shape and is flexible and deformable independently of the expandable part, and the cylindrical shape has a proximal part connected to a proximal part of the expandable part or connected to the shaft part located at a proximal side with respect to the expandable part. The covering part defines a space in the radial direction between a distal side end part of the cylindrical shape and the expandable part.

Abstract: A medical device to be inserted into a body lumen to obstruct flow in the body lumen includes a shaft unit; a proximal slider and a distal slider that are slidable along the shaft unit; a first expanding member including a distal portion coupled to the proximal slider and a proximal portion coupled to the shaft unit; a second expanding member including a distal portion coupled to the distal slider and a proximal portion coupled to the proximal slider; and a cover that surrounds an outer periphery of the first expanding member and coupled to the proximal portion of the first expanding member, the cover being tubular and flexibly deformable independently of the first expanding member.

Abstract: A medical device is disclosed for restricting a flow in a body lumen by being inserted into the body lumen. The medical device including an elongated shaft part; an expansion part which is a tubular body having a plurality of gaps and elastically deformable, with the shaft part being connected to at least one of both side end portions of the tubular body; a cover part which is flexibly deformable independently from the expansion part while surrounding an outer circumference of the expansion part, which is tubular in shape, both end portions of the tubular shape being connected to both end portions of the expansion part; and a sheath in which the expansion part and the cover part both contracted in diameter can be accommodated.

Abstract: A catheter system includes a shaft main body including an elongated hollow outer tube and an inner tube accommodated in the inside of the elongated hollow outer tube. The hollow inside of the inner tube is suctioned from the proximal end side thereof. The outer tube has an opening formed in a circumferential surface thereof and an attaching portion provided therein on the distal end side with respect to the opening. The inner tube can move in an axial direction with respect to the outer tube, and at least a distal end side end portion thereof can move back and forth between a proximal end side position with respect to the opening and the attaching portion.

Abstract: A tube connection structure is disclosed, which includes a first connector and a second connector that are fitted together. The first connector includes an outer cylinder; a communicating section which is formed with a liquid passage in which a liquid can circulate in a fitted state, and an annular valve body which is provided around the communicating section and seals an outer cylinder opening portion in a non-fitted state. The second connector includes an inner cylinder which pushes the annular valve body in the fitted state, an inner valve body which seals an inner cylinder opening portion in the non-fitted state and is pushed by the communicating section advancing into the inner cylinder through the inner cylinder opening portion in the fitted state, and a first seal member which is provided at least on an inner peripheral surface of the inner cylinder opening portion.