A catheter system insertable into a living body to convey blood has a catheter tube and a stylet. The catheter tube has an expansion portion, a shaft portion, and a lumen. The stylet includes an outer peripheral member that extends in an axial direction and has an outer diameter the same as an inner diameter of the shaft portion, an inner peripheral member provided with an exposed portion exposed from a distal end of the outer peripheral member and provided on an inner periphery of the outer peripheral member so as to be slidable with respect to the outer peripheral member, and a fitting stopper into which a fitting member on an outer periphery of a proximal end of the outer peripheral member is fittable. A region is formed in the fitting stopper in which the outer peripheral member and the fitting member are movable.

The present disclosure relates generally to the field of medical devices and establishing fluid communication between body lumens. In particular, the present disclosure relates to devices and methods for establishing a controlled flow or access passage between body lumens.

An imaging catheter, a tip, a tube body and a medical device, relating to the field of medical instruments, where the imaging catheter includes a tube body and a tip, the tube body includes a first shuttling wall and a second shuttling wall, a first lumen is formed between the first shuttling wall and the second shuttling wall, the tip includes a first mounting wall and a second mounting wall, and a second lumen is formed between the first mounting wall and the second mounting wall. The second lumen is communicated with the first lumen, and a proximal end of the first mounting wall corresponds between the first shuttling wall and the second shuttling wall. A radial distance between a point m and a point n is a, and an inner diameter of the first lumen is b, where a≥b.

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.

The present specification is directed towards catheter devices having expandable and collapsible lumens. Air or fluid is pumped into the catheter wall to cause it to expand. Alternatively, wires are embedded within the wall and a direction of flow of electrical current through the wires is modulated to enable the catheter device to be in the collapsed or expanded state. For example, a first wire is embedded within the wall and is helically wound along a length of the catheter device. A second wire is provided that can be removably positioned within the lumen. The direction of flow of electric current through the first and second wires is modulated to enable the catheter device to be in the collapsed or expanded state.

An expandable introducer sheath provided with a steering mechanism is disclosed. The introducer sheath is configured for providing a prosthesis delivery system percutaneous access to a patient's vasculature. The introducer sheath includes a sheath component defining a central lumen and having a longitudinally-extending, radially-expandable portion. The sheath component also includes a steering wire slidably disposed within a wall thereof that longitudinally extends along the radially-expandable portion. When the steering wire is in a slackened configuration, the steering wire permits a width of the radially-expandable portion to increase. When the steering wire is in a taut configuration, the steering wire permits a distal portion of the sheath component to be manipulated or bent in order to align a distal port of the introducer sheath, for instance, with an ostium of a branch vessel.

An introducer sheath for the insertion of a medical device into a blood vessel having an expandable sheath. The sheath has a length, a thickness, and proximal and distal ends. The expandable sheath has a frame extending longitudinally between the proximal and the distal ends, and having an exterior surface and an interior surface that forms an interior lumen along the length of the frame. The frame is configured to achieve an expanded state and a contracted state, the expanded state forming an expanded cross-section in the lumen for passing a medical device therethrough. The frame has a smooth coating about the exterior surface and protrusions extending into the lumen along the interior surface. The introducer sheath can be introduced into a patient in the contracted state, with the distal end of the introducer sheath prevented from moving in the proximal direction by an abutment against a dilator end surface.

A delivery sheath includes an outer tubular layer and an initially folded inner tubular layer. When an implant passes therethrough, the outer tubular layer expands and the inner tubular layer unfolds into an expanded lumen diameter. The sheath may also include selectively placed longitudinal support rods that mediate friction between the inner and outer tubular layers to facilitate easy expansion, thereby reducing the push force needed to advance the implant through the sheath's lumen.

A catheter assembly may include a catheter adapter, which may include a body and a side port extending outwardly from the body. The body may include a distal end, a proximal end, and an inner surface extending through the distal end and the proximal end and forming a lumen. An angle of the side port with respect to a longitudinal axis of the body may be adjustable. The catheter assembly may include a catheter extending distally from the distal end of the catheter adapter. The catheter assembly may include a septum disposed within the lumen proximal to a side port pathway extending through the side port and in fluid communication with the lumen.

A wiggle catheter (a dilator) is disclosed to facilitate advancing catheters after puncturing a blood pathway, including without limitation navigation of noncompliant hardware through a diseased lumen. The wiggle catheter includes a proximal section, a distal section, and an intermediate section disposed between the proximal section and the distal section, the intermediate section may include a plurality of angulated kinks along the long axis of the catheter, the angulated kinks having substantially the same diameter at the outer edge of the kinks, said diameter of the outer edge of the kinks being substantially same as the inner diameter of an introducer sheath whereby the wiggle catheter may be positioned inside the introducer sheath with the outer edges of the kinks in close proximity to the inner surface of the introducer sheath. The wiggle catheter may also include a sinusoidal waveform like structure or a helical or spiral structure.