Intravascular fluid catheter with minimal internal fluid volume
First Claim
1. A percutaneously deliverable system for peri-vascular fluid delivery comprising:
- a fluid delivery catheter having a proximal control portion, a central catheter body, and a distal fluid delivery portion,wherein the distal fluid delivery portion includes two or more guide tubes adapted to advance simultaneously, each guide tube having a distal end and a lumen, wherein distal movement of the two or more guide tubes causes the two or more guide tubes to curve outward toward a target vessel wall but not penetrate the target vessel wall, the distal fluid delivery portion includes two or more injection needles, each injection needle having an injection needle lumen and an outlet, each injection needle adapted to move distally and proximally relative to and within a lumen of a respective guide tube of the two or more guide tubes, the two or more injection needles further adapted to move distally outward to penetrate the target vessel wall, each injection needle adapted to extend beyond the respective guide tube of the two of more guide tubes until further extension is prevented such that each injection needle extends beyond the respective guide tube up to a maximum distance;
wherein the proximal control portion includes a proximal port for injection of fluids;
wherein the central catheter body includes an injection lumen that provides fluid communication between the proximal port for injection of fluids and the injection needle lumens of the injection needles;
wherein the fluid delivery catheter further includes an internal fluid volume extending from a proximal end of the proximal port of the proximal control portion to the outlets of the injection needles, the internal fluid volume being less than 0.5 ml.
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Accused Products
Abstract
A catheter-based/intravascular ablation (denervation) system includes a multiplicity of needles which expand open around a central axis to engage the wall of a blood vessel, or the wall of the left atrium, allowing the injection of a cytotoxic or/or neurotoxic solution for ablating conducting tissue, or nerve fibers around the ostium of the pulmonary vein, or circumferentially in or just beyond the outer layer of the renal artery. The expandable needle delivery system is formed with self-expanding materials and include structures, near the end portion of the needles, or using separate guide tubes. The system also includes means to limit and/or adjust the depth of penetration of the ablative fluid into the tissue of the wall of the targeted blood vessel. The preferred embodiment of the catheter delivered through the vascular system of a patient includes a multiplicity of expandable guide tubes that engage the wall of a blood vessel. Injection needles having injection egress at or near their sharpened distal end are then advanced through the guide tubes to penetrate the wall of the blood vessel to a prescribed depth. The ability to provide PeriVascular injection so as to only affect the outer layer(s) of a blood vessel without affecting the media has particular application for PeriVascular Renal Denervation (PVRD) of the sympathetic nerves which lie in the adventitia or outside the adventitia of the renal artery.
313 Citations
16 Claims
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1. A percutaneously deliverable system for peri-vascular fluid delivery comprising:
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a fluid delivery catheter having a proximal control portion, a central catheter body, and a distal fluid delivery portion, wherein the distal fluid delivery portion includes two or more guide tubes adapted to advance simultaneously, each guide tube having a distal end and a lumen, wherein distal movement of the two or more guide tubes causes the two or more guide tubes to curve outward toward a target vessel wall but not penetrate the target vessel wall, the distal fluid delivery portion includes two or more injection needles, each injection needle having an injection needle lumen and an outlet, each injection needle adapted to move distally and proximally relative to and within a lumen of a respective guide tube of the two or more guide tubes, the two or more injection needles further adapted to move distally outward to penetrate the target vessel wall, each injection needle adapted to extend beyond the respective guide tube of the two of more guide tubes until further extension is prevented such that each injection needle extends beyond the respective guide tube up to a maximum distance; wherein the proximal control portion includes a proximal port for injection of fluids; wherein the central catheter body includes an injection lumen that provides fluid communication between the proximal port for injection of fluids and the injection needle lumens of the injection needles; wherein the fluid delivery catheter further includes an internal fluid volume extending from a proximal end of the proximal port of the proximal control portion to the outlets of the injection needles, the internal fluid volume being less than 0.5 ml. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for fluid delivery comprising:
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a fluid delivery catheter having a proximal portion, a central catheter body, and a distal fluid delivery portion, wherein the distal fluid delivery portion includes two or more guide tubes adapted to advance simultaneously, wherein distal movement of the two or more guide tubes causes the two or more guide tubes to curve outward toward a target vessel wall but not penetrate the target vessel wall, wherein each guide tube has a distal end and a lumen, wherein the distal fluid delivery portion includes two or more injection needles, wherein each injection needle has an injection needle lumen and an outlet, each injection needle adapted to move distally and proximally relative to and within a lumen of a respective guide tube of the two or more guide tubes, wherein the two or more injection needles are adapted to move radially outward to penetrate the target vessel wall, each injection needle adapted to advance beyond the distal end of the respective guide tube of the two or more guide tubes until further advancement is prevented such that each injection needle extends beyond the respective guide tube up to a maximum distance; wherein the proximal portion includes a port; wherein the central catheter body includes an injection lumen that provides fluid communication between the port and each injection needle lumen of the two injection needles.
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Specification