Abstract: A treatment method reduces the time required to exchange a long catheter which is introduced from an arm to treat the lower limb artery. The treatment method involves introducing a first catheter from an artery of one arm of the patient to dispose a distal portion of the first catheter at least in front of the lesion area in the lower limb artery; introducing a second catheter from an artery of the other arm of the patient; disposing a first treatment catheter in the lesion area through the first catheter; treating the lesion area with the first treatment catheter; and assisting the treatment with the second catheter and/or a second treatment catheter that is inserted into the second catheter.

Abstract: A method for diagnosing, validation of diagnosis and treating a patient having lesions in both arteries of left and right lower limbs. By determining that a larger vessel diameter lesion to be treated first, catheters and an operation time can be reduced is to be treated first on a priority basis based on diagnostic data, deciding that a smaller vessel diameter lesion is to be treated next, then treating the lesions substantially continuously.

Abstract: A catheter assembly in which a microcatheter of an over-the-wire type is a first catheter and is inserted into a lumen of a guiding catheter that is a second catheter. The first and second catheters are configured to make a clearance of greater than 0.1 mm and less than or equal 0.35 mm to reduce a step, so that a distal end opening of the guiding catheter is prevented from rubbing against an inner surface of a blood vessel in a way that would otherwise rupture plaque and scatter cholesterol crystals.

Abstract: Provided are a treatment method, a separation method, and a filter assembly capable of preventing so-called “Blue Toe syndrome” which is so-called cholesterol crystal embolism of which a fat-soluble compound such as cholesterol crystals generated during dilation of a stenosed site causes clogging in glomeruli of peripheral capillaries or kidney, acute renal failure, and the like. Cholesterol crystals generated from plaque during use of a balloon catheter are taken out of the body and removed using a centrifugal separation device or a filter, and usable living cells are returned to the body to reduce blood transfusion and reduce cholesterol crystal embolism.

Abstract: A catheter assembly in which a microcatheter of a rapid exchange type is a first catheter and is inserted into a lumen of a guiding catheter that is a second catheter. The first and second catheters are configured to make a clearance slightly exceeding 0.1 mm to reduce a step, so that a distal end opening of the guiding catheter is prevented from rubbing against an inner surface of a blood vessel in a way that would otherwise rupture plaque and scatter cholesterol crystals.

Abstract: A catheter that includes an inner layer forming the inner surface of a tubular catheter main body having a lumen, an outer layer forming the outer surface of the catheter main body, and multiple reinforcements embedded between the inner surface and the outer surface. The inner diameter of the catheter main body is D1, the outer diameter is D2, the wall thickness is T1, a thickness of each reinforcement is T2, an effective width of each reinforcement is W, and a total number of the multiple reinforcements is N. The catheter satisfies Expressions (1), (2), and (3): 0.050 mm?T1?0.100 mm??Expression (1) T2/T1?0.25??Expression (2) 60,000?(D1×D2×W×N)/(T12×T2)<1,000,000??Expression (3).

Abstract: A treatment method involves introducing a catheter into a blood vessel in an arm of the patient and is advanced to position the distal end of the catheter in a blood vessel in a lower limb on one side of the patient's body. A treatment device is inserted into the catheter and advanced to a treatment target in the lower limb on the one side of the patient's body. The catheter is then moved to shift the distal end of the catheter from the blood vessel in the lower limb on the one side of the patient's body to a blood vessel in the lower limb on the other side of the patient's body. A treatment instrument can then be introduced into the catheter and advanced to carry out treatment on a treatment target in the lower limb on the other side of the patient's body.

Abstract: A route selection assistance system, a recording medium on which a route selection assistance program is recorded, a route selection assistance method, and a diagnosis method that enable easy selection of a route of a living body lumen for delivering a medical instrument to a site within a living body via the living body lumen. A route selection assistance system includes: a receiving section configured to receive an input of site information specifying a target site; an image obtaining section configured to obtain image information on a living body of a target patient; a route extracting section configured to extract a plurality of routes of a living body lumen; a ranking assigning section configured to assign rankings to the plurality of routes extracted by the route extracting section; and an output section configured to output the plurality of routes extracted and the rankings assigned by the ranking assigning section.

Abstract: In a method for diagnosing and treating a patient having lesions in both arteries of left and right lower limbs. By determining that a lesion distal to an aortailiac bifurcation is to be treated first, catheters and an operation time can be reduced. The lesion to be treated first can be on a priority basis based on diagnostic data, deciding that a lesion proximal to the bifurcation is to be treated next, and then treating the lesions substantially continuously.

Abstract: A catheter that includes a catheter marker having a radiopaque property that can identify a distal end orientation of the catheter for a short time inside the body, and a diagnostic method. A catheter marker having a radiopaque property is disposed asymmetrically with respect to the center of a shaft centerline of the catheter, and angiograms having different shapes under the radiopaque are obtained, so that it is possible to rather easily determine a position and a distal end orientation of the catheter.

Abstract: In a method for diagnosing and treating a patient having lesions in both arteries of left and right lower limbs. By determining that a lesion distal to an aortailiac bifurcation is to be treated first, catheters and an operation time can be reduced. The lesion to be treated first can be on a priority basis based on diagnostic data, deciding that a lesion proximal to the bifurcation is to be treated next, and then treating the lesions substantially continuously.

Abstract: Provided is a catheter that is excellent in visibility of a braid distal end portion inside and outside the body, is excellent in stenosed site crossability and trackability to a tortuous blood vessel, and prevents the braid from spreading out due to the stenosed site penetration. The catheter includes a shaft, the shaft includes an inner layer, an outer layer, and a braid that is disposed between the inner layer and the outer layer and includes a plurality of metal wires being woven together, the braid includes a welding portion at a further proximal side than a distal end of the shaft and in the vicinity of a distal end of the braid, and the shaft includes an radiopaque marker at a position separated from the welding portion, thereby preventing the braid from spreading out due to buckling of the shaft, and improving the blood vessel trackability.

Abstract: In a method for diagnosing and treating a patient having lesions in both arteries of left and right lower limbs. By determining that a larger lesion curvature to be treated first, catheters and an operation time can be reduced is to be treated first on a priority basis based on diagnostic data, deciding that a smaller lesion curvature is to be treated next, then treating the lesions substantially continuously.

Abstract: A medical device and a medical device set are disclosed capable of improving passability of a balloon catheter through a body lumen and protection of a balloon. The medical device is an auxiliary device for the balloon catheter, and the medical device has an elongated base shaft, and a distal end member including an extending portion that extends along a longitudinal direction of the base shaft and a balloon protecting portion that is provided on a distal end side relative to the extending portion and is formed in a spiral shape. The balloon protecting portion includes a space portion configured to at least partially accommodate the balloon of the balloon catheter that is provided inward in a radial direction of the spiral shape, and a tapered portion having an outer diameter which decreases toward the distal end side.

Abstract: A catheter that includes an inner layer forming the inner surface of a tubular catheter main body having a lumen, an outer layer forming the outer surface of the catheter main body, and multiple reinforcements embedded between the inner surface and the outer surface. The inner diameter of the catheter main body is D1, the outer diameter is D2, the wall thickness is T1, a thickness of each reinforcement is T2, an effective width of each reinforcement is W, and a total number of the multiple reinforcements is N. The catheter satisfies Expressions (1), (2), and (3): 0.050 mm?T1?0.100 mm??Expression (1) T2/T1?0.25??Expression (2) 60,000?(D1×D2×W×N)/(T12×T2)<1,000,000??Expression (3).

Abstract: A catheter that includes an inner layer forming the inner surface of a tubular catheter main body having a lumen, an outer layer forming the outer surface of the catheter main body, and multiple reinforcements embedded between the inner surface and the outer surface. The inner diameter of the catheter main body is D1, the outer diameter is D2, the wall thickness is T1, a thickness of each reinforcement is T2, an effective width of each reinforcement is W, and a total number of the multiple reinforcements is N. The catheter satisfies Expressions (1), (2), and (3): 0.050 mm?T1?0.100 mm??Expression (1) T2/T1?0.25??Expression (2) 60,000?(D1×D2×W×N)/(T12×T2)<1,000,000??Expression (3).

Abstract: A treatment method reduces the time required to exchange a long catheter which is introduced from an arm to treat the lower limb artery. The treatment method involves introducing a first catheter from an artery of one arm of the patient to dispose a distal portion of the first catheter at least in front of the lesion area in the lower limb artery; introducing a second catheter from an artery of the other arm of the patient; disposing a first treatment catheter in the lesion area through the first catheter; treating the lesion area with the first treatment catheter; and assisting the treatment with the second catheter and/or a second treatment catheter that is inserted into the second catheter.

Abstract: Provided are a treatment method, a separation method, and a filter assembly capable of preventing so-called “Blue Toe syndrome” which is so-called cholesterol crystal embolism of which a fat-soluble compound such as cholesterol crystals generated during dilation of a stenosed site causes clogging in glomeruli of peripheral capillaries or kidney, acute renal failure, and the like. Cholesterol crystals generated from plaque during use of a balloon catheter are taken out of the body and removed using a centrifugal separation device or a filter, and usable living cells are returned to the body to reduce blood transfusion and reduce cholesterol crystal embolism.

Abstract: In a method for diagnosing, validating, and treating a patient having lesions in both arteries of left and right lower limbs. By determining that a softer lesion to be treated first, catheters and an operation time can be reduced is to be treated first on a priority basis based on diagnostic data, deciding that a harder lesion is to be treated next, then treating the lesions substantially continuously.

Abstract: A route selection assistance system, a recording medium on which a route selection assistance program is recorded, a route selection assistance method, and a diagnosis method that enable easy selection of a route of a living body lumen for delivering a medical instrument to a site within a living body via the living body lumen. A route selection assistance system includes: a receiving section configured to receive an input of site information specifying a target site; an image obtaining section configured to obtain image information on a living body of a target patient; a route extracting section configured to extract a plurality of routes of a living body lumen; a ranking assigning section configured to assign rankings to the plurality of routes extracted by the route extracting section; and an output section configured to output the plurality of routes extracted and the rankings assigned by the ranking assigning section.