Elongate medical devices with an expandable structure including elongated splines and a distal hub. An elongate medical device includes a handle including a control mechanism, a catheter shaft, an expandable structure including elongated splines and a distal hub, wherein each of the elongated splines includes a shape memory material and an interactive element, wherein each of the elongated splines includes a respective spline proximal end and a spline distal end, wherein each of the spline proximal ends is connected to the catheter shaft distal end, and wherein each of the spline distal ends is connected to the distal hub, and a deflection control member connected to the distal hub, wherein the control mechanism is drivingly coupled to the distal hub via the deflection control member and operable to selectively vary a position of the distal hub relative to the catheter shaft distal end to selectively vary an amount of expansion of the expandable structure, wherein a shape of the expandable structure is produced via a combination of the shape memory material and the position of the distal hub relative to the catheter distal end.

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 multi lumen catheter assembly. The assembly provides an expandable, low profile, fixed length sheath and catheter, with fixed infusion ports. The assembly has an expandable outer sheath that expands upon pressure activation with a fluid and the sheath allows the fluid to exit from at least one predetermined fixed location from a distal end of the catheter assembly. The catheter assembly can be used in various medical device procedures, such as a TIPS (Transjugular Intrahepatic Portosystemic Shunt) procedure, or anywhere a low profile, multi lumen, infusion catheter system is desired.

A pulsed field ablation catheter for use in atrial fibrillation treatment having a distal steerable variable loop with multiple electrodes coupled to the distal end of a multilumen shaft and a handle coupled to the proximal end of the multilumen shaft. A shape imparting mechanism coupled to the handle is configured to change the shape of steerable loop by manipulating a steering mechanism to steer the steerable loop to the treatment site and a rotational actuator to change the diameter of the variable loop to better interface with varying human anatomy.

A method for forming a catheter tube assembly includes providing a reinforcement structure and disposing a catheter tube 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 tube includes an outer wall and a septum. The catheter tube is disposed over the reinforcement structure such that the catheter tube septum envelopes the septum reinforcement portion of the reinforcement structure.

A hemodialysis catheter is disclosed for deploying in an artery or vein, comprising various means for disrupting, mechanically and/or chemo-mechanically, a fibrous sheath forming naturally outside of the catheter; optionally the disrupted fibrin sheath and/or thrombus is captured.

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.

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.

An elongate medical device comprising a first lumen, wherein a cross-sectional shape of the first lumen comprises a peanut shape, and a plurality of second lumens, wherein the plurality of second lumens are proximate the first lumen, wherein the first lumen comprises a lumen liner that conforms to the cross-sectional shape of the first lumen, wherein the lumen liner comprises a first material and the elongate medical device comprises a second material, where the first material is different from the second material.

A multi lumen catheter assembly. The assembly provides an expandable, low profile, fixed length sheath and catheter, with fixed infusion ports. The assembly has an expandable outer sheath that expands upon pressure activation with a fluid and the sheath allows the fluid to exit from at least one predetermined fixed location from a distal end of the catheter assembly. The catheter assembly can be used in various medical device procedures, such as a TIPS (Transjugular Intrahepatic Portosystemic Shunt) procedure, or anywhere a low profile, multi lumen, infusion catheter system is desired.