Disclosed is a multi-lumen catheter having a distal end catheter tip configured to improve fluid flow into and out from the catheter tip while reducing undesired recirculation during hemodialysis treatment of a patient. A first lumen and a second lumen each extends from the catheter proximal end to the catheter distal end, the first lumen and the second lumen being parallel to each other. A septum having a first side and a second side separates the first lumen from the second lumen. Some embodiments of the catheter tip include a beveled shape region, having a first lumen orifice, a second lumen orifice, and a septum top surface. Within the beveled shape region, at least a portion of the septum first side and at least a portion of the septum top surface form a first eave over the first lumen and at least a portion of the septum second side and at least a portion of the septum top surface form a second eave over the second lumen.

An introducer sheath is described. The introducer sheath may include a tubular body. The tubular body may extend from a distal end toward a proximal end. The tubular body may include a lumen. The lumen may at least partially be defined by a wall. A channel may be disposed within the wall. The channel may be configured to receive a guidewire. The tubular body may include an expandable portion expandable to increase a cross-sectional area of the lumen.

A catheter for insertion into a body of a patient, and methods of making and using. The catheter can include a distal portion that remains stable during fluid infusion into the patient, thus reducing or eliminating whipping of the catheter distal tip. The catheter includes at least one lumen and can be configured such that the arithmetic product of an elastic modulus and an area moment of inertia for the distal portion of the catheter is greater than the arithmetic product of an elastic modulus and an area moment of inertia for a proximal portion. The catheter can be attached to an implantable access port that may include features for use as a power injectable access port.

An embodiment provides an overtube which includes: a plurality of lumens including a lumen with a pliable folded structure at a portion to be inserted into a treatment target; and a grip portion having a rigidity in a radial direction, being easily inserted into the treatment target, allowing a medical device to be easily inserted thereinto, and facilitating administration of a drug.

An elongate medical device comprising an expandable structure with an expandable configuration and a collapsed configuration, a handle, operably coupled to the expandable structure, the handle further including a selective movement limiter; and a deflection control member coupled with the distal hub, where the deflection control member is configured to adjust a stiffness of the expandable structure, from a first stiffness to a second stiffness, and maintain the first stiffness or the second stiffness when the selective movement limiter couples with the deflection control member and limits a longitudinal movement of the deflection control member, and wherein the deflection control member is configured to move freely when the selective movement limiter is not coupled with the deflection control member.

A catheter having a selectively inflatable external balloon and an internal balloon, where the internal balloon is operable as a valve to control fluid flow through a channel.

A single or multiple lumen catheter is disclosed which includes an expandable lumen. The expandable lumen is movable from a collapsed or sealed configuration to an open or expanded configuration. In the open configuration, the expandable lumen is dimensioned to receive a guidewire or stylet or facilitate the introduction of fluids into a patient.

A tube element for a device for introduction into a body passage comprises a first tube element end and a second tube element end, wherein a longitudinal dimension is formed between the first and second tube element end. The tube element has a sheath comprising an outer wall and an inner wall. A cross-sectional element is arranged between the first and second tube element ends. The cross-sectional element contains a plurality of opening arrangements. Each opening arrangement comprises a first opening containing an insert element and a second opening, the internal pressure of which can be changed by a pressure changing means.

A catheter assembly including a reinforcement structure and a catheter disposed over the reinforcement structure. The reinforcement structure includes a first outer wall reinforcement portion, a second outer wall reinforcement portion, and a septum reinforcement portion connecting the first outer wall reinforcement portion to the second outer wall reinforcement portion. The catheter includes a catheter outer wall and a catheter septum. The first outer wall reinforcement portion and the second outer wall reinforcement portion can be positioned at least partially in the catheter outer wall, and the septum reinforcement portion can be enveloped by the catheter septum. The catheter assembly can also include an outer tube disposed over the catheter and the reinforcement structure.

Neuromodulation catheters with shafts for enhanced flexibility and control and methods of making and using the catheters. A neuromodulation catheter can include an elongated shaft having a distal end portion and a mandrel extending at least along the distal end portion. The mandrel can have an at least substantially solid core. The neuromodulation catheter can further include a transition member and a neuromodulation assembly coupled to the transition member. The transition member can have a proximal portion, a distal portion, and a guide wire lumen extending through the proximal and distal portions. The neuromodulation assembly can extend distally from the distal portion of the transition member, and the mandrel can extend proximally from the proximal portion of the transition member.