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AssigneeKensey Nash Corporation
InventorsJohn E. Nash, William T. Fisher, Charles W. Dodson, Jr.
Estimating the term…
A system and method for opening a lumen in an occluded blood vessel, e.g., a coronary bypass graft, of a living being. The system comprises an atherectomy catheter having a working head, e.g., a rotary impacting impeller, and a debris extraction sub-system. The atherectomy catheter is located within a guide catheter. The working head is arranged to operate on, e.g., impact, the occlusive material in the occluded vessel to open a lumen therein, whereupon some debris may be produced. The debris extraction sub-system introduces an infusate liquid at a first flow rate adjacent the working head and withdraws that liquid and some blood at a second and higher flow rate, through the guide catheter to create a differential flow adjacent the working head, whereupon the debris is withdrawn in the infusate liquid and blood for collection outside the being's body. The introduction of the infusate liquid may also be used to establish an unbalanced flow adjacent the working head to enable the atherectomy catheter to be steered hydrodynamically. A guide wire having an inflatable balloon on its distal end may be used with the atherectomy catheter to block the flow of debris distally, while enabling distal tissues to be perfused with an oxygenating liquid. At least one flow control port may be provided in the guide catheter to prevent collapse of the vessel being revascularized. A cradle is provided to fix the guide catheter and guide wire in position within the body of the being while enabling the atherectomy catheter to be advanced along the guide wire and through the guide catheter.
An intravascular system for opening a lumen in a portion of an occluded blood vessel of a living being's vascular system, the occluded blood vessel portion being occluded by an occlusive material and being located downstream of a patent blood vessel portion, said system comprising a first catheter, a vessel-opening catheter, a debris blocking member, and a debris extraction system, said first catheter having a distal end portion including an opening, a passageway extending therethrough and in communication with said opening, and at least one blood entrance port, said vessel-opening catheter extending through said first catheter and having a working head, said working head being arranged to be located immediately adjacent the occlusive material for operating on the occlusive material to open a lumen for the freer flow of blood therethrough, whereupon some debris may be produced, said debris blocking member being located distally of said working head to prevent debris from flowing distally thereof, said debris extraction system being operative to introduce a liquid adjacent said working head and to cause debris and said liquid to flow proximally through said opening and said passageway for extraction, said at least one blood entrance port of said first catheter being in communication with said passageway and with the patent blood vessel portion, whereupon blood from said patent blood vessel portion may enter for merger with said liquid and the debris.
A method for opening a lumen in a portion of an occluded blood vessel of a living being's vascular system, the occluded blood vessel portion being occluded by an occlusive material, the occluded blood vessel portion being located distally of a patent blood vessel portion, said method comprising:
A method for opening a lumen in a portion of an occluded blood vessel of a living being's vascular system, the occluded blood vessel portion being occluded by an occlusive material, the occluded blood vessel portion being located distally of a patent blood vessel portion, said method comprising:
Dependencies are inferred from the claim text.