A device and method for visualization of the intravascular creation of autologous valves, and particularly venous valve, is disclosed herein. One aspect of the present technology, for example, is directed toward a delivery catheter that can include a lumen configured to receive a dissection assembly and a trough having a plurality of transducers electrically coupled to a proximal portion of the delivery catheter. At least one of the transducers can be configured to emit a signal towards a portion of a blood vessel adjacent the trough, and at least one of the transducers can be configured to receive a reflection of the emitted signal.

Embodiments of the invention are directed towards a rapid exchange catheter configured for insertion into a subintimal space and crossing an occlusion in a subintimal space. The catheter includes a proximal end, a distal end, a first lumen configured to receive a first wire, the first lumen extending longitudinally through a least a lateral port of the catheter, and a second lumen having at least a portion distal of the lateral port and extending through at least the distal end of the catheter. The catheter also includes an exchange port arranged on a exterior portion of the catheter configured to the receive a second wire and second rapid exchange port in communication with the second lumen. Moreover, other embodiments of the invention are directed towards methods for using the rapid exchange catheter to cross an obstruction in a vessel, e.g., a total or partial occlusion, in a subintimal space.

Vascular access devices and methods of their use are provided. In one embodiment, a vascular access device includes a catheter (112) and at least one deployable wire (134). The catheter includes a primary lumen extending from a proximal end to a distal end of the catheter. The at least one deployable wire is secured to the catheter and configured to move relative to the catheter between a delivery configuration and a deployed configuration.

A method for operating an ultrasonic reentry device, includes: providing an ultrasound transmission member having a proximal end and a distal end; providing a catheter body having a lumen surrounding the ultrasound transmission member; providing a dilator slidably disposed within the lumen of the catheter body, the dilator surrounding the ultrasound transmission member; and exposing the distal end of the ultrasound transmission member from a distal end of the dilator.

Described here are devices, systems and methods for forming a fistula between two blood vessels. Generally, the systems may comprise a first catheter which may comprise a fistula-forming element. The fistula-forming element may comprise one or more electrodes, mechanical cutting elements, laser sources, or combinations thereof, and may be used to assist in fistula formation. In some instances, a system may comprise a second catheter, which may comprise a fistula-forming element. One or more of the catheters may comprise one or more markers, magnetic alignment elements, and/or one shape-changing elements.

A device includes a first end portion, a second end portion, an intermediate portion, and a graft material. The first end portion has a first end diameter. The second end portion has a second end diameter smaller than the first end diameter. The first end portion comprises a first material. The second end portion comprises a second material different than the first material. The intermediate portion is between the first end portion and the second end portion. The intermediate portion tapers between the first end portion and the second end portion. The graft material is coupled to at least the intermediate portion.

Disclosed are methods and systems for restoring patency across a vascular or non-vascular occlusion. The system may include a retrograde catheter, having a proximal end, a distal end, a first central lumen and a first side port spaced proximally apart from the distal end, the first central lumen extending at least as far as the first side port. An antegrade catheter is also provided, having a proximal end, a distal end, a second central lumen in communication with a second side port spaced proximally apart from the distal end. The catheters may have complementary surface configurations to facilitate alignment of the first and second side ports, so that a wire may be passed out of one of the side ports and into the other side port.

Disclosed are methods and devices for restoring patency across a vascular or non-vascular occlusion. A first catheter having a first side port is configured to advance in a first direction through a vessel from a vascular access site on a first side of the occlusion. A second catheter having a second side port is configured to advance in a second direction through the vessel from a vascular access site on a second side of the occlusion. The catheters may have complementary surface configurations to facilitate alignment of the first and second side ports, so that a wire may be passed through the catheters, out of one of the side ports and into the other side port, to bypass the occlusion.

A catheter has a guide-tip including at least one wing for crossing a CTO lesion in an artery via exploring the subintimal space. The catheter can includes one or more exit port(s) and radiopaque marker(s) for steering a re-entry wire through one of the exit ports. The catheter may include a number of spiral-cut sections with varying characteristics to provide different strength and flexibility along the axial direction.

Disclosed are methods and devices for bidirectional crossing of a vascular obstruction in a patient. The method includes the steps of advancing a first catheter transvascularly in a first (e.g., retrograde) direction towards a vascular obstruction, the first catheter having a first central lumen in communication with a first side port. A second catheter is advanced transvascularly in a second, opposite (e.g., antegrade) direction towards the obstruction, the second catheter having a second central lumen in communication with a second side port. The first and second side ports are aligned to place the first central lumen in communication with the second central lumen; and a wire is advanced through the first and second side ports such that a first end of the wire is on a first side of the obstruction and a second end of the wire is on a second side of the obstruction.