Expandable catheter system for peri-ostial injection and muscle and nerve fiber ablation
First Claim
1. A circumferential ablation system comprising:
- a catheter body comprising a fluid injection lumen;
an injector manifold;
a sheath;
at least two injector tubes, each injector tube comprising a proximal end and a distal end, the proximal ends of the at least two injector tubes attached to the injector manifold, the injector manifold configured to move the at least two injector tubes simultaneously, each injector tube comprising an injector tube lumen and an injector needle at the distal end of the respective injector tube, each injector tube lumen in fluid communication with the fluid injection lumen; and
one or more structures initially disposed within the sheath and configured to move outward from the sheath, the one or more structures movable outward beyond the diameter of the sheath toward a target tissue, the at least two injector tubes and the injector manifold movable relative to the one or more structures and along a longitudinal axis of the sheath,wherein the one or more structures comprise a shape memory material.
2 Assignments
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Accused Products
Abstract
At the present time, physicians often treat patients with atrial fibrillation (AF) using radiofrequency (RF) catheter systems to ablate conducting tissue in the wall of the Left Atrium of the heart around the ostium of the pulmonary veins. These systems are expensive and take time consuming to use. The present invention circular ablation system CAS includes a multiplicity of expandable needles that can be expanded around a central axis and positioned to inject a fluid like ethanol to ablate conductive tissue in a ring around the ostium of a pulmonary vein quickly and without the need for expensive capital equipment. The expansion of the needles is accomplished by self-expanding or balloon expandable structures. The invention includes centering means so that the needles will be situated in a pattern surrounding the outside of the ostium of a vein. Also included are members that limit the distance of penetration of the needles into the wall of the left atrium, or the aortic wall. The present invention also has an important application to ablate tissue around the ostium of one or both renal arteries, for the ablation of the sympathetic nerve fibers and/or other afferent or efferent nerves going to or from each kidney in order to treat hypertension.
275 Citations
20 Claims
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1. A circumferential ablation system comprising:
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a catheter body comprising a fluid injection lumen; an injector manifold; a sheath; at least two injector tubes, each injector tube comprising a proximal end and a distal end, the proximal ends of the at least two injector tubes attached to the injector manifold, the injector manifold configured to move the at least two injector tubes simultaneously, each injector tube comprising an injector tube lumen and an injector needle at the distal end of the respective injector tube, each injector tube lumen in fluid communication with the fluid injection lumen; and one or more structures initially disposed within the sheath and configured to move outward from the sheath, the one or more structures movable outward beyond the diameter of the sheath toward a target tissue, the at least two injector tubes and the injector manifold movable relative to the one or more structures and along a longitudinal axis of the sheath, wherein the one or more structures comprise a shape memory material. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A circumferential ablation system comprising:
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a body portion comprising a fluid injection lumen; an injector manifold; a sheath; at least two injector tubes fixed relative to the injector manifold, the injector manifold configured to move the at least two injector tubes, each of the injector tubes comprising an injector tube lumen and an injector needle at a distal end of the respective injector tube, each injector tube lumen in fluid communication with the fluid injection lumen; and a mechanical structure initially disposed within the sheath and configured to move outward from the sheath, the mechanical structure movable outward beyond the sheath toward a target tissue, the at least two injector tubes and the injector manifold movable relative to the mechanical structure and along a longitudinal axis of the sheath. - View Dependent Claims (8, 9, 10, 11, 12, 20)
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13. A circumferential ablation system comprising:
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a catheter body comprising a fluid injection lumen; an injector manifold disposed within the catheter body; at least two injector tubes fixedly coupled with the injector manifold, the injector manifold configured to move the at least two injector tubes to ensure uniform expansion of the at least two injector tubes relative to a tissue, each of the injector tubes comprising an injector tube lumen and an injector needle at the distal end of the respective injector tube, each injector tube lumen in fluid communication with the fluid injection lumen; a mechanical centering structure, the mechanical centering structure configured to ensure that the at least two injector tubes extend circumferentially, the at least two injector tubes and the injector manifold configured to slide independently relative to the mechanical centering structure and along a central axis of the catheter body. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification