Abstract: A catheter having a shaft including a wire lumen, a sensor lumen that is arranged side by side with the wire lumen, a projection part that includes the wire lumen, projects to the more distal side than the distal end of the sensor lumen, and has a distal end opening in communication with the wire lumen at the distal end of the projection part, and a first notch that is formed on the more proximal end side than the projection part, and is in communication with the wire lumen. The first notch is formed on a side surface of the shaft, the side surface being positioned on the opposite side of the sensor lumen, and the shaft includes, in a section with the first notch, a bottom portion facing the first notch and a pair of side walls extending to the opposite side of the sensor lumen.

Abstract: To fix an intersection at a stent, a stent is configured such that multiple strands are woven in a spiral shape, two crossing strands are fixed by a fixing material having rubber elasticity at an intersection between the strands.

Abstract: Some of strands of a stent are disposed using a strand made of a platinum alloy material. In the stent (10) formed by helicoidally braiding a plurality of strands, some even-numbered strands among the plurality of strands are disposed using a platinum alloy material.

Abstract: A tip end portion of a strand forming a stent is rounded off. In a stent 10 formed by helicoidally braiding a plurality of strands 20, the tip end portion of each of the strands 20 is rounded off.

Abstract: A strand made of a platinum alloy material is prevented from protruding from both ends of a stent when some strands of the stent are disposed using the strand made of the platinum alloy material. In a stent (10) which is formed by helicoidally braiding a plurality of strands, some strands among the plurality of strands are disposed using a strand made of a platinum alloy material, and a length of the strand made of the platinum alloy material is made shorter than lengths of other strands by a length of the strand made of the platinum alloy material which is estimated to protrude from the stent.

Abstract: A catheter includes a protective film covering an inner periphery of a proximal end side of a tubular mesh member, the tubular mesh member being expandable and contractible in a radial direction. The tubular mesh member including a first wire that is interwoven with a second wire. The protective film being joined only to any one of either the first wire or the second wire. The catheter has improved efficiency for removing a blockage in a blood vessel, and the catheter can prevent breakage of a retrograde guide wire. Additionally, the mesh member having the protective film is able to smoothly expand and contract.

Abstract: A catheter including an outer tube; a first inner tube disposed within the outer tube; a second inner tube disposed within the outer tube and parallel to the first inner tube, and having an insertion opening at its proximal end and a distal end opening at its distal end; and a first core wire and a second core wire disposed between the first inner tube and an outer tube. The second inner tube extends from a medial region of the catheter to a distal end of the catheter. A distal end of the first core wire is located distal to the insertion opening of the second inner tube, and a distal end of the second core wire is located proximal to the insertion opening of the second inner tube. The second core wire can move between the outer tube and the first inner tube.

Abstract: A medical device includes an expandable-and-contractible member capable of radially expanding and radially contracting, an incising member disposed on an outer circumference of the expandable-and-contractible member and having a hollow portion, a core wire inserted in the hollow portion, a distal tip, and a ring. The core wire is capable of sliding in a longitudinal direction of the medical device as the expandable-and-contractible member expands or contracts. The incising member is therefore not likely to come off upon radial expansion or radial contraction of the expandable-and-contractible member, and is therefore not likely to interfere with the expanding or contracting movement of the expandable-and-contractible member.

Abstract: A tip end portion of a strand forming a stent is rounded off. In a stent 10 formed by helicoidally braiding a plurality of strands 20, the tip end portion of each of the strands 20 is rounded off.

Abstract: A strand made of a platinum alloy material is prevented from protruding from both ends of a stent when some strands of the stent are disposed using the strand made of the platinum alloy material. In a stent (10) which is formed by helicoidally braiding a plurality of strands, some strands among the plurality of strands are disposed using a strand made of a platinum alloy material, and a length of the strand made of the platinum alloy material is made shorter than lengths of other strands by a length of the strand made of the platinum alloy material which is estimated to protrude from the stent.

Abstract: Some of strands of a stent are disposed using a strand made of a platinum alloy material. In the stent (10) formed by helicoidally braiding a plurality of strands, some even-numbered strands among the plurality of strands are disposed using a platinum alloy material.

Abstract: A guide wire may include a core shaft and an external coil body covering a distal portion of the core shaft. The external coil body includes a first coil portion and a second coil portion that is distal to the first coil portion. An outside diameter of the second coil portion is smaller than an outside diameter of the first coil portion. Similarly, the guide wire may include a core shaft, a first external coil body, and a second external coil body. An outside diameter of the second external coil body is smaller than an outside diameter of the first external coil body. The external coil body or first and second external coil bodies enable the performance of a pushing-out operation and a drawing-in operation of the stent; yet, the flexibility of the guide wire is maintained.

Abstract: A guide wire may include a core shaft and an external coil body covering a distal portion of the core shaft. The external coil body includes a first coil portion and a second coil portion that is distal to the first coil portion. An outside diameter of the second coil portion is smaller than an outside diameter of the first coil portion. Similarly, the guide wire may include a core shaft, a first external coil body, and a second external coil body. An outside diameter of the second external coil body is smaller than an outside diameter of the first external coil body. The external coil body or first and second external coil bodies enable the performance of a pushing-out operation and a drawing-in operation of the stent; yet, the flexibility of the guide wire is maintained.

Abstract: A catheter includes an inner layer, and a braid provided on an outer periphery of the inner layer. The braid includes a first wire and a second wire that are woven together. The catheter further includes a tip provided on a distal end of the inner layer and a distal end of the braid. A residual portion having a sharp shape formed at a distal end of the first wire when the first wire is cut is not left untreated, but is formed into a bulging portion.

Abstract: A catheter including an outer tube; a first inner tube disposed within the outer tube; a second inner tube disposed within the outer tube and parallel to the first inner tube, and having an insertion opening at its proximal end and a distal end opening at its distal end; and a first core wire and a second core wire disposed between the first inner tube and an outer tube. The second inner tube extends from a medial region of the catheter to a distal end of the catheter. A distal end of the first core wire is located distal to the insertion opening of the second inner tube, and a distal end of the second core wire is located proximal to the insertion opening of the second inner tube. The second core wire can move between the outer tube and the first inner tube.

Abstract: A pusher guide wire and a delivery system can smoothly pass through the inside of even a curved blood vessel without causing excessive burden to a stent, a catheter, and the like. A pusher guide wire has a tubular member capable of moving in a radial direction relative to a core shaft of the pusher guide wire. When the pusher guide wire is used together with a stent in a delivery system, the tubular member makes contact with the stent in an appropriate manner when passing through the inside of a curved blood vessel. The stent may include a proximal end engagement portion provided at a proximal end of the stent. When the stent is placed so that the proximal end engagement portion engages with the pusher guide wire, the stent can be pulled back inside the catheter by pulling the pusher guide wire in the proximal direction.

Abstract: A stent delivery system includes a pusher guide wire for delivering a stent having an anchor member. The pusher guide wire includes a core shaft, a coil body that is disposed around a distal portion of the core shaft and includes a tapered portion having an outer diameter that decreases toward a distal end of the coil body, and a protruded portion fixed to the coil body at a position distal to the tapered portion. The anchor member is positioned between the tapered portion and the protruded portion when the stent is delivered using the pusher guide wire. The anchor member can therefore be pushed in the distal direction by the tapered portion of the coil body. Moreover, the stent can be retracted into the catheter by pulling the pusher guide wire in the proximal direction so that the protruded portion contacts the anchor member.

Abstract: A catheter can efficiently transmit an operator's pushing force to a distal end of the catheter with a reduced risk of getting caught at a curved region of a lumen (e.g., a blood vessel, bile duct, pancreatic duct or the like). The catheter includes a first core wire and a second core wire disposed between an inner tube and an outer tube. The second core wire can move to an optimal position depending on external forces exerted at a curved region of the lumen when the catheter is inserted into the curved region. Therefore, there is a reduced risk that the first core wire and the second core wire will interfere with each other, which would prevent the catheter from bending along the lumen and potentially break one or both of the first core wire and the second core wire.

Abstract: A medical device includes an expandable-and-contractible member capable of radially expanding and radially contracting, an incising member disposed on an outer circumference of the expandable-and-contractible member and having a hollow portion, a core wire inserted in the hollow portion, a distal tip, and a ring. The core wire is capable of sliding in a longitudinal direction of the medical device as the expandable-and-contractible member expands or contracts. The incising member is therefore not likely to come off upon radial expansion or radial contraction of the expandable-and-contractible member, and is therefore not likely to interfere with the expanding or contracting movement of the expandable-and-contractible member.

Abstract: A catheter includes a protective film covering an inner periphery of a proximal end side of a tubular mesh member, the tubular mesh member being expandable and contractible in a radial direction. The tubular mesh member including a first wire that is interwoven with a second wire. The protective film being joined only to any one of either the first wire or the second wire. The catheter has improved efficiency for removing a blockage in a blood vessel, and the catheter can prevent breakage of a retrograde guide wire. Additionally, the mesh member having the protective film is able to smoothly expand and contract.