摘要:
A mechanism for the deployment of an endovascular device having a coupling element attached to its proximal end, includes a deployment tube having a proximal end, a distal section, open distal end, and a lumen extending between the proximal and distal ends. A retention sleeve, fixed around the distal section, includes an extension extending past the distal end of the tube. The retention sleeve is fixed around the coupling element, so that the coupling element is releasably held within the extension. In use, the deployment tube, with the implant attached to its distal end, is passed intravascularly until the device is deployed within a target site. A liquid is injected through the lumen so as to push the coupling element out of the retention sleeve by fluid pressure, thereby detaching the endovascular device from the deployment tube.
摘要:
A vascular implant formed of a compressible foam material has a compressed configuration from which it is expansible into a configuration substantially conforming to the shape and size of a vascular site to be embodied. Preferably, the implant is formed of a hydrophobic, macro porous foam material, having an initial configuration of a scaled-down model of the vascular site, from which it is compressible into the compressed configuration. The implant is made by scanning the vascular site to create a digitized scan data set; using the scan data set to create a three-dimensional digitized virtual model of the vascular site; using the virtual model to create a scaled-down physical mold of the vascular site; and using the mold to create a vascular implant in the form of a scaled-down model of the vascular site. To embolism a vascular site, the implant is compressed and passed through a micro catheter, the distal end of which has been passed into a vascular site. Upon entering the vascular site, the implant expands in situ substantially to fill the vascular site. A retention element is contained within the micro catheter and has a distal end detachably connected to the implant. A flexible, tubular deployment element is used to pass the implant and the retention element through the micro catheter, and then to separate the implant from the retention element when the implant has been passed out of the micro catheter and into the vascular site.
摘要:
An embolization device includes a plurality of highly-expansible embolizing elements disposed at spaced intervals along a filamentous carrier. In a preferred embodiment, the carrier is a suitable length of very thin, highly flexible filament of nickel/titanium alloy. The embolizing elements are separated from each other on the carrier by radiopaque spacers in the form of highly flexible microcoils made of platinum or platinum/tungsten alloy. In a preferred embodiment, the embolizing elements are made of a hydrophilic, macroporous, polymeric, hydrogen foam material. The device is particularly suited for embolizing a vascular site such as an aneurysm. The embolization bodies have an initial configuration in the form of small, substantially cylindrical “micropellets” of small enough outside diameter to fit within a microcatheter. The bodies are hydrophilically expansible into an expanded configuration in which they substantially conform to and fill the vascular site while connected to the carrier. A method for embolizing a vascular site using this device includes the steps of: (a) passing a microcatheter intravascularly so that its distal end is in a vascular site; (b) providing a vascular embolization device comprising a plurality of highly expansible embolizing elements carried on a filamentous carrier and separated from each other on the carrier by microcoil spacers; (c) passing the embolization device through the microcatheter so that it emerges from the distal end of the microcatheter into the vascular site; and (d) expanding the embolizing elements in situ substantially to fill the vascular site while retaining the embolizing elements on the carrier. Preferably, the method also includes the step of deploying a vaso-occlusive device in the vascular site, or an intravascular device in a blood vessel adjacent the vascular site, before embolization device is passed through the microcatheter.
摘要:
An embolization device includes a plurality of highly-expansible embolizing elements disposed at spaced intervals along a filamentous carrier. In a preferred embodiment, the carrier is a suitable length of very thin, highly flexible filament of nickel/titanium alloy. The embolizing elements are separated from each other on the carrier by radiopaque spacers in the form of highly flexible microcoils made of platinum or platinum/tungsten alloy. In a preferred embodiment, the embolizing elements are made of a hydrophilic, macroporous, polymeric, hydrogel foam material. The device is particularly suited for embolizing a vascular site such as an aneurysm. The embolization bodies have an initial configuration in the form of small, substantially cylindrical “micropellets” of small enough outside diameter to fit within a microcatheter. The bodies are hydrophilically expansible into an expanded configuration in which they substantially conform to and fill the vascular site while connected to the carrier. A method for embolizing a vascular site using this device includes the steps of: (a) passing a microcatheter intravascularly so that its distal end is in a vascular site; (b) providing a vascular embolization device comprising a plurality of highly expansible embolizing elements carried on a filamentous carrier and separated from each other on the carrier by microcoil spacers; (c) passing the embolization device through the microcatheter so that it emerges from the distal end of the microcatheter into the vascular site; and (d) expanding the embolizing elements in situ substantially to fill the vascular site.
摘要:
A cannula used in the distention and irrigation of a saphenous vein which is being tested prior to use as a coronary or peripheral bypass graft includes a tapered and beveled tip which allows easy insertion into the vein, and a sloping shoulder just proximal to the tip which provides a convenient site for firmly securing the vein to the cannula with a ligature. The cannula can be utilized in a distention and irrigation apparatus which includes a pressure limiting device having a resilient membrane reservoir which limits static pressure delivered to the vein to a predetermined level. The device is connected between the cannula of the present invention and a syringe filled with irrigation fluid.
摘要:
Embolectomy catheters, rapid exchange microcatheters, systems and methods for removing clots or other obstructive matter (e.g., thrombus, thromboemboli, embolic fragments of atherosclerotic plaque, foreign objects, etc.) from blood vessels. This invention is particularly useable for percutaneous removal of thromboemboli or other obstructive matter from small blood vessels of the brain, during an evolving stroke or period of cerebral ischemia. In some embodiments, the embolectomy catheters of this invention are advanceable with or over a guidewire which has been pre-inserted through or around the clot. Also, in some embodiments, the embolectomy catheters include clot removal devices which are deployable from the catheter after the catheter has been advanced at least partially through the clot. The clot removal device may include a deployable wire nest that is designed to prevent a blood clot from passing therethrough. The delivery catheter may include telescoping inner and outer tubes, with the clot removal device being radially constrained by the outer tube. Retraction of the outer tube removes the constraint on the clot removal device and permits it to expand to its deployed configuration. An infusion guidewire is particularly useful in conjunction with the embolectomy catheter, and permits infusion of medicaments or visualization fluids distal to the clot.
摘要:
A vaso-occlusive device includes a microcoil formed into a minimum energy state secondary configuration comprising a plurality of curved segments, each defining a discrete axis, whereby the device, in its minimum energy state configuration, defines multiple axes. Confinement of the device within an aneurysm causes it to assume a three-dimensional configuration with a higher energy state than the minimum energy state. Because the minimum energy state configuration of the device is larger (in at least one dimension) than the aneurysm, the deployed device is constrained by its contact with the walls of the aneurysm from returning to its minimum energy state configuration. The engagement of the device with the aneurysm wall minimizes shifting or tumbling due to blood flow.
摘要:
Devices and methods for treatment of a patient's vasculature with some embodiments configured for delivery with a microcatheter for treatment of the cerebral vasculature of a patient. Some embodiments may include a permeable shell and inner structure configured to occlude blood flow therethrough.
摘要:
Devices and methods for treatment of a patient's vasculature with some embodiments configured for delivery with a microcatheter for treatment of the cerebral vasculature of a patient. Some embodiments may include a permeable shell and inner structure configured to occlude blood flow therethrough.
摘要:
A vascular implant formed of a compressible foam material has a compressed configuration from which it is expansible into a configuration substantially conforming to the shape and size of a vascular site to be embolized. Preferably, the implant is formed of a hydrophilic, macroporous foam material, having an initial configuration of a scaled-down model of the vascular site, from which it is compressible into the compressed configuration. The implant is made by scanning the vascular site to create a digitized scan data set; using the scan data set to create a three-dimensional digitized virtual model of the vascular site; using the virtual model to create a scaled-down physical mold of the vascular site; and using the mold to create a vascular implant in the form of a scaled-down model of the vascular site. To embolize a vascular site, the implant is compressed and passed through a microcatheter, the distal end of which has been passed into a vascular site. Upon entering the vascular site, the implant expands in situ substantially to fill the vascular site. A retention element is contained within the microcatheter and has a distal end detachably connected to the implant. A flexible, tubular deployment element is used to pass the implant and the retention element through the microcatheter, and then to separate the implant from the retention element when the implant has been passed out of the microcatheter and into the vascular site.