System and method of use for revascularizing stenotic bypass grafts and other blood vessels
First Claim
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1. A system for removing occlusive material from an occluded blood vessel portion of a living being'"'"'s vascular system, comprising:
- an elongated flexible tubular body member having a free end adapted to be delivered intravascularly to the occluded blood vessel portion and deliver a jet of infusate liquid into said vessel to dislodge particles of said occlusive material;
an infusate pump for delivering said infusate liquid to said occluded blood vessel portion at an infusate flow rate; and
an aspiration pump for aspirating infusate liquid, blood and dislodged particles from the occluded blood vessel portion at an aspiration flow rate;
wherein said aspiration flow rate is greater than said infusate flow rate and said infusate and aspiration pumps are simultaneously operable to create a differential flow rate in said occluded blood vessel portion and thereby prevent particles of occlusive material from flowing into any upstream blood vessel or downstream blood vessel in said living being'"'"'s vascular system.
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Abstract
A system and method for opening a lumen in an occluded blood vessel, e.g., a coronary bypass graft, of a living being'"'"'s vascular system. The system introduces an infusate liquid at a first flow rate to the occluded portion of the blood vessel, and withdraws that liquid and some blood at a second and higher flow rate. This action creates a differential flow in the occluded blood vessel portion and thereby prevent particles of occlusive material from flowing into any upstream blood vessel or downstream blood vessel in said living being'"'"'s vascular system.
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Citations
34 Claims
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1. A system for removing occlusive material from an occluded blood vessel portion of a living being'"'"'s vascular system, comprising:
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an elongated flexible tubular body member having a free end adapted to be delivered intravascularly to the occluded blood vessel portion and deliver a jet of infusate liquid into said vessel to dislodge particles of said occlusive material; an infusate pump for delivering said infusate liquid to said occluded blood vessel portion at an infusate flow rate; and an aspiration pump for aspirating infusate liquid, blood and dislodged particles from the occluded blood vessel portion at an aspiration flow rate; wherein said aspiration flow rate is greater than said infusate flow rate and said infusate and aspiration pumps are simultaneously operable to create a differential flow rate in said occluded blood vessel portion and thereby prevent particles of occlusive material from flowing into any upstream blood vessel or downstream blood vessel in said living being'"'"'s vascular system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for removing occlusive material from an occluded blood vessel portion of a living being'"'"'s vascular system, comprising:
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providing a system comprising; (i) an elongated flexible tubular body member having a free end adapted to be delivered intravascularly to the occluded blood vessel portion and deliver a jet of infusate liquid into said vessel to dislodge particles of said occlusive material; (ii) an infusate pump for delivering said infusate liquid, at an infusate flow rate; and (iii) an aspiration pump for aspirating infusate liquid, blood and occlusive material from the occluded blood vessel portion at an aspiration flow rate; simultaneously aspirating infusate liquid, blood and dislodged particles from the occluded blood vessel portion at an aspiration flow rate that is greater than said infusate flow rate to create a differential flow rate in said occluded blood vessel portion and thereby prevent particles of occlusive material from flowing into any upstream blood vessel or downstream blood vessel in said living being'"'"'s vascular system. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A system for removing occlusive material from a blood vessel portion of a living being'"'"'s vascular system comprising:
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an elongated flexible tubular body member adapted to be delivered intravascularly to the occluded portion of a blood vessel; an infusate pump for delivery an infusate liquid at an infusate flow rate into said blood vessel; and an aspiration pump for aspirating said infusate liquid and said occlusive material at an aspiration flow rate, wherein said infusate flow rate is less than said aspiration flow rate, and wherein said rates serve to prevent embolization of said occlusive material in the living being'"'"'s vascular system. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification