249 results about "External catheter" patented technology

A delivery system for delivering and deploying stent grafts having a proximal stent includes a first lumen and a stent capture device including a capture portion fixedly connected adjacent a first lumen distal end. An outer catheter has a catheter distal end and a catheter inner diameter. A second lumen having a second distal end is slidably disposed about the first lumen and within the outer catheter. A stent graft sheath has a sheath proximal end connected to the second distal end and disposed about the first lumen. The sheath has a sheath distal end and a sheath inner diameter greater than the catheter inner diameter for holding a compressed stent graft. A distal nose cone has a cone proximal end connected to either the capture portion or the first distal end. The nose cone and the capture portion are movably adjustable to selectively capture the sheath distal end therebetween.

A reverse flow pump comprising two concentric passageways and an interior compartment having cut out portions in communication with a pump passageway for the directional flow of fluid relative to the pump, and a rotor positioned within the interior compartment for reversing the directional flow of fluid through a region in communication with another pump passageway. A reverse flow pump and cannula system is further provided comprising an inner cannula adjoining a pump passageway, and an outer conduit adjoining another pump passageway for the reverse flow of fluid relative to the pump. A method of transporting fluid between body cavities is also provided comprising the steps of selecting a reverse flow pump and cannula system, forming an opening in a body passageway, positioning the outer conduit through the opening, inserting the inner cannula into the outer conduit so that the distal openings of the inner cannula and the outer conduit are positioned in separated portions of the body, connecting the inlet and the outlet passageways of the pump to the proximal ends of the inner cannula and the outer conduit, and activating the pump to transport fluid between the separated portions of the body.

A stent delivery catheter. The catheter includes an inner catheter tube and an outer catheter tube which are rotatable relative to each other. The inner catheter and outer catheter include recesses to receive the ends of the stent, permitting pull wires to engage the stent ends without need to for the pull wires to extend radially beyond the bounds of the catheter or requiring the stent ends to protrude it into the lumen of the inner or outer catheter.

A catheter assembly employs an outer catheter with a pre-formed distal end and an open lumen. An inner catheter having an open lumen and a pre-formed distal end is movably disposed within the outer catheter. Relative rotation and extension of the inner and outer catheters provides the distal end of the catheter assembly with an adjustable range of two- and three-dimensional shapes. The inner catheter can include sections of varying stiffness, such that extension of the inner catheter within the outer catheter modifies the shape of the outer catheter's pre-formed distal end. The adjustable shaping of the catheter assembly's distal tip provides an improved system for locating and cannulating cardiac venous structures, particularly the coronary sinus via the right atrium.

Sheaths of fabric material are compressed on either side of a separator by manipulating internal and external catheters to form disks which sandwich the neck of an aneurysm to obliterate the aneurysm.

A kit for the withdrawal of a blood vessel filter of the umbrella type formed from a bush (31) serving as a sleeve for retaining a number of flexible strands (32) that spread apart naturally and end in hooks (33) directed outwards so that they lock onto the wall of a vessel, comprising

• • a first so-called “external” catheter (1)
  • a stem that can be inserted in the external catheter and has, at one of its ends, a number of flexible legs (18) that open out from the stem, spreading apart naturally and ending in hooks (20) directed inwards for grasping bush (31) of the filter as they close up again and preferably in addition a second catheter (11), of diameter such that it can be introduced into the external catheter (1).

The present invention relates to a delivery apparatus for delivering a self-expanding neurovascular stent that allows for smooth movement of the apparatus along a typically tortuous vascular path, ease of stent deployment, and ease of stent retractability being pushed and pulled through the delivery apparatus. The apparatus includes an outer catheter, and an inner shaft located coaxially within the outer catheter. The stent is mounted on the distal section of the inner shaft and preloaded within the outer catheter distal region. The inner shaft includes at least one stent blocking member disposed in the distal section. The self-expanding stent has proximal, middle and distal ends and is comprised of a plurality of closed cells. The self-expanding stent includes locking members which interlock with the blocking member(s) disposed on the inner shaft so as to lock the stent onto the inner shaft within the outer catheter, and to enable the stent retractable together with the inner shaft being out of and retrieved back to the outer catheter. More specially, the invention may be used in the treatment of blood vessel blockage and aneurysms which occur in the brain.

An occlusion system is disclosed for use with a catheter having a catheter proximal end and a catheter distal end. The catheter further has a catheter wall with an outer catheter dimension at the catheter distal end and with the catheter wall defining a catheter lumen with a longitudinal axis extending from the catheter proximal end and through the catheter distal end. The occlusion system includes an occlusion member having an inner wall and an outer wall. The inner wall defines an occlusion member lumen extending throughout an axial length of the occlusion member. The outer wall is expandable between a contracted state with a first transverse dimension and an expanded state with a second transverse dimension. The second transverse dimension is greater than the outer catheter dimension. The occlusion member is sized for the occlusion member to be received at least partially around an exterior of the catheter lumen with the catheter received within the occlusion member lumen and advanced from the catheter proximal end toward the catheter distal end.

A prosthesis delivery and deployment device includes an elongate and flexible outer catheter. The outer catheter has a tubular wall of layered construction, including a translucent inner liner running the complete catheter length, and three outer layers including a translucent distal layer, an opaque medial layer and an opaque proximal outer layer. The outer layers are adjacent one another and are bonded to the liner. A braid composed of helically wound metal filaments is disposed between the liner and the proximal and medial outer layers, and includes a distal portion between the liner and a proximal portion of the distal outer layer. The liner and distal outer layer provide a translucent distal region of the catheter that is adapted to constrain a radially self-expanding prosthesis in a radially reduced, axially elongated state. Because the stent constraining region is translucent, an endoscope can be used to visually monitor the stent when so constrained. Radiopaque markers can be mounted to the outer catheter and to an inner catheter used to deploy the prosthesis, to afford a combined visual and fluoroscopic monitoring for enhanced accuracy in positioning the prosthesis, both before and during its deployment.

An occlusion system is disclosed for use with a catheter having a catheter proximal end and a catheter distal end. The catheter has a catheter wall with an outer catheter dimension at the catheter distal end and with the catheter wall defining a catheter lumen with a longitudinal axis extending from the catheter proximal end and through the catheter distal end. The occlusion system includes an occlusion member having an inner wall and an outer wall. The inner wall defines an occlusion member lumen extending throughout an axial length of the occlusion member. The outer wall is expandable between a contracted state with a first transverse dimension and an expanded state with a second transverse dimension. The second transverse dimension is greater than the outer catheter dimension. The occlusion member is sized to be received within the catheter lumen and advanced from the catheter proximal end to the catheter distal end when the outer wall is in the contracted state and with the occlusion member lumen aligned with the catheter lumen. Further embodiments include a rapid-delivery occlusion member advanced along the outer wall of a pre-placed catheter.

A catheter system includes a guide catheter having a lumen defining a distal orifice. The catheter system further includes a conduit segment positioned within the lumen and movable between (i) an upper position at which the conduit segment is entirely contained within the lumen of the guide catheter, and (ii) a lower position at which the conduit segment extends through the distal orifice so as to be partially positioned outside of the guide catheter. The catheter system further includes an actuator wire positioned within the lumen of the guide catheter and coupled to the conduit segment. Movement of the actuator wire causes movement of the conduit segment.

A gripping device for a catheter assembly is disclosed providing enhanced gripping power for the operator of the catheter assembly. The gripping device is situated at the proximal portion of the catheter assembly and the proximal terminus of an external catheter sheath is attached near or to the body of the gripping device.

A funnel or cone-shaped portion of a funnel device is fixed to the distal end of a guide catheter. The funnel is configured with an adjustable opening. The funnel can be fixed to a guide catheter and the orifice of the funnel may be expanded or collapsed via adjusting the tension on a wire controlling the size of the orifice. Alternatively, an outer catheter over the funnel is used to adjust the orifice. The funnel may include a pair of expandable rings of different diameter, or it may be configured from braided wires heat-shaped into a funnel. Preferably, a funnel sheath is provided. An engagement member may be provided on a support member.

In one embodiment, the stent delivery system comprises an inner catheter. A handle is disposed at the proximal end of the inner catheter, and an enlarged tip is disposed at the distal end thereof. A stent engaging sleeve coaxially surrounds and is secured to a portion of the inner catheter proximally contiguous to the tip. A stent is mounted over the stent engaging sleeve in a longitudinally stretched state and is maintained, until deployment, in the stretched state by a stent restraining sleeve. The stent restraining sleeve, which coaxially surrounds the stent and is appropriately sized to maintain the stent in its stretched state, is a braided tube formed directly over the stent. The system also includes an outer catheter that surrounds much of the distal end of the inner catheter up to its tip, the outer catheter being adapted for axial movement relative to the inner catheter.

A catheter including an outer conduit and an inner conduit movably disposed therein. The distal tip of the inner conduit extends beyond the distal tip of the outer conduit. An inflatable balloon has a first margin attached to the distal tip of the outer conduit, and a second margin attached to the portion of the inner conduit extending beyond the distal tip of the outer conduit. The balloon includes a middle portion, an inflatable distal side portion having at least one tapering part and an inflatable proximal side portion having at least one tapering portion. The length of proximal side portion is equal to or larger than the length of the middle portion. The distal end portion of the balloon is capable of intussuscepting upon proximal movement of the inner conduit within the outer conduit. The catheter includes an inflation/deflation port for introducing and removal of inflating fluid.

A balloon catheter, for use with an introducer, includes an outer catheter, a telescopically disposed resilient inner catheter and a high-aspect, distal, inflatable balloon having one end of the balloon coupled to the inner catheter and an opposing end of the balloon coupled to the outer catheter. The balloon is joined at its corresponding ends to the corresponding inner and outer catheters, so that the balloon, when inflated, buckles and twists the inner catheter inside the outer catheter. This creates forces which automatically return the balloon to the wrapped configuration when deflated. The balloon diameter to length aspect ratio is equal to or greater than 1. The balloon is wrapped around the self adjusting inner catheter extended from the outer catheter when the balloon is deflated so that the outer and inner catheters with the deflated balloon fit and are disposable through the introducer.

A catheter assembly configured for retrieval of medical devices from vasculature. The catheter includes an outer catheter and an inner catheter. The inner and/or outer catheter can include a tapered terminal end portion. A mandrel can be provided to facilitate advancement of the assembly within vasculature.

Plasma fluid removal is needed in a variety of clinical conditions including congestive heart failure and moderate renal insufficiency. In order to avoid the problems inherent in extracorporeal ultrafiltration methods, the present invention removes fluid using an intravascular or intracorporeal dual-lumen catheter. Plasma fluid is driven across a semipermeable membrane, as in an in vivo vascular catheter. Suboptimal intracatheter flow, luminal collapse, erratic high transmembrane flow with nonhomogenous caking and clotting of the external catheter surface are all avoided by inducing pressure gradients across the wall by means of osmotic forces instead of negative pressures induced by hydraulic pumps. Osmotically induced fluid flow would tend to keep the lumena slightly distended and thereby simplify the fluid delivery systems. Osmotic gradients are maintained by utilizing dual lumen catheters typically placed in large central veins, and attached to pumps supplying high osmolality sterile solutions (such as dextrose or other sugars). Such a sealed system using readily available sterile sugar solutions and biocompatible catheter substrate would be extremely safe.