To provide a new balloon catheter enabling formation of, with high dimensional accuracy and excellent shape adaptability with respect to a balloon, an additional structure such as a blade and a reinforcement member to be additionally provided to the balloon. In this balloon catheter 10 provided with an expandable/contractible balloon 14 on the distal end side of a catheter 12, an additional structure 36 having a prescribed pattern is formed through electroforming or the like directly onto an inner circumferential surface 34 and/or an outer circumferential surface 82 of the balloon 14.

A balloon catheter is provided with a main tube and an air tube therein. The main tube is provided with a central lumen to allow the balloon catheter to travel across and be guided along a guidewire during insertion into a vasculature of a patient. The air tube is configured to transfer fluid, such as air, to a balloon for inflating and deflating the balloon. The air tube can be embedded within the inner and outer surfaces of the main tube. Holes are cut into the main tube and a portion of the air tube to expose the air tube to the environment outside of the main tube. The holes allow for fluid communication between the air tube and the balloon. The holes are cut or sheared at a direction that is lateral to the longitudinal direction of the catheter tube.

A balloon catheter includes an inflation conduit including an inner inflation tube, an outer inflation tube disposed around the inner inflation tube, and an inflation lumen disposed between the inner and outer inflation tubes. The inner inflation tube includes a first polymer material, and a stiffener integrated into the inner inflation tube to increase a strength of the inner inflation tube. The stiffener includes a second polymer material different from the first polymer material. A balloon is attached to a distal end portion of the inflation conduit. An interior space of the balloon is in fluid communication with the inflation lumen for inflating the balloon when the inflation lumen is placed in fluid communication with an inflation source.

The present disclosure provides a catheter that includes a catheter tube defining the guidewire lumen with the catheter tube including an extruded polymer material. Molecules of the extruded polymer material extend circumferentially around the catheter tube to stiffen the catheter tube for strengthening the catheter tube against radial compression forces.

A balloon catheter has an outer shaft which surrounds a shaft lumen. The outer shaft has a proximal outer shaft portion connected to a distal outer shaft portion. An inner shaft is in a distal portion of the shaft lumen. A guide wire lumen is in the inner shaft. An opening at a proximal end portion of the inner shaft permits the guide wire to be guided out from the outer shaft. A metallic tube is in the shaft lumen. The proximal end portion of the inner shaft is engaged with the metallic tube. A separate, elongate and metallic stiffening element is in the shaft lumen, and is connected to the metallic tube and protrudes from the metallic tube into the distal portion of the shaft lumen and into the proximal portion of the shaft lumen to stiffen portions of the outer shaft.

A balloon catheter and method for manufacturing are disclosed in which the fracturing of the vicinity of a proximal opening portion formed by an inner shaft can be prevented. A distal side of an inner shaft included by a balloon catheter is disposed in a lumen of an outer distal shaft, and a proximal side of the inner shaft is disposed on an outer surface of an outer proximal shaft, and the inner shaft forms a proximal opening portion which opens on an outer surface side of the outer proximal shaft. The inner shaft has a first region and a second region disposed on a proximal side of the first region. The first region is fixed to the outer surface of the outer proximal shaft. The second region is not fixed to the outer surface of the outer proximal shaft.

A catheter may include a distal side and a proximal side comprising a shaft having an outer tubular member, and an insertion member. The catheter may have at least a part of the insertion member in an axial direction disposed in the outer tubular member. At least one outer tubular member or insertion member is a multilayer tube having a first layer and a second layer laminated with the first layer. In a cross-section perpendicular to an axial direction of the multilayer tube, a ratio of cross-sectional areas of the second layer to the first layer is 0.7 or less.

A catheter (10) for introduction into a body vessel includes a shaft, a balloon (12) positioned at the distal end of the shaft, and at least one scoring wire (30) to score a vascular lesion. A distal end portion of the scoring wire is detachably connected to the catheter, such as by way of magnetic coupling (30a), thereby allowing for selective use of the catheter in a scoring or non-scoring configuration. The balloon expands when fluid is delivered to the balloon through an inflation lumen. This expansion pushes the scoring wire against the vascular lesion.

A balloon catheter includes a shaft having a first shaft portion and a second shaft portion located on a proximal side of the first shaft portion, and a balloon covering and joined to the second shaft portion. The first shaft portion is more flexible than the second shaft portion and has a length in an axial direction of 1.5 cm or more.

In some examples, a medical device includes a balloon inflatable to an inflated configuration. The balloon includes an outer layer coextruded on an inner layer. The outer layer has a maximum radial ratio that is lower than that of the inner layer.