Peri-vascular tissue ablation catheter with support structures
First Claim
1. A catheter comprising:
- a catheter body having a central axis extending in a longitudinal direction and a fluid injection lumen;
at least two needle guiding elements adapted to advance outwardly toward an interior wall of a target vessel;
a control mechanism adapted to control the outward advancement of the at least two needle guiding elements without inflating a balloon;
at least two injection needles, each injection needle having an injection lumen in fluid communication with the fluid injection lumen of the catheter body, the at least two injection needles adapted to be advanced outwardly, guided by at least two needle guiding elements, to penetrate the interior wall of the target vessel, each injection needle having a distal opening for fluid delivery; and
an injection needle control mechanism adapted to control the outward advancement of the at least two injection needles beyond the distal ends of the at least two needle guiding elements.
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Accused Products
Abstract
An intravascular catheter for peri-vascular or peri-urethral tissue ablation includes multiple needles advanced through supported guide tubes which expand around a central axis to engage the interior surface of the wall of the renal artery or other vessel of a human body allowing the injection an ablative fluid for ablating tissue, such as nerve fibers in the outer layer or deep to the outer layer of the vessel, or in prostatic tissue. The system may also control the depth of penetration of the ablative fluid into and beyond the tissue of the vessel wall. The catheter may also include structures which provide radial or lateral support to the guide tubes so that the guide tubes expand uniformly and maintain their position against the interior surface of the vessel wall as the sharpened injection needles are advanced to penetrate into the vessel wall.
283 Citations
19 Claims
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1. A catheter comprising:
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a catheter body having a central axis extending in a longitudinal direction and a fluid injection lumen; at least two needle guiding elements adapted to advance outwardly toward an interior wall of a target vessel; a control mechanism adapted to control the outward advancement of the at least two needle guiding elements without inflating a balloon; at least two injection needles, each injection needle having an injection lumen in fluid communication with the fluid injection lumen of the catheter body, the at least two injection needles adapted to be advanced outwardly, guided by at least two needle guiding elements, to penetrate the interior wall of the target vessel, each injection needle having a distal opening for fluid delivery; and an injection needle control mechanism adapted to control the outward advancement of the at least two injection needles beyond the distal ends of the at least two needle guiding elements. - View Dependent Claims (2, 3, 4, 5)
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6. A catheter comprising:
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a catheter body having a central axis extending in a longitudinal direction and a fluid injection lumen; at least two needle guiding elements disposed within the catheter body and adapted to advance outwardly from the catheter body toward an interior wall of a target vessel, wherein ends of at least two needle guiding elements return to a curved shape when unconstrained from the catheter body; a support structure disposed within the catheter body and adapted to support each needle guiding element as the at least two needle guiding elements advance outwardly from the catheter body toward the interior wall of the target vessel; at least two injection needles, each injection needle having an injection lumen in fluid communication with the fluid injection lumen of the catheter body, the at least two injection needles adapted to be advanced outwardly, guided by the at least two needle guiding elements to penetrate the interior wall of the target vessel, each injection needle having a distal opening for fluid delivery. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. A catheter comprising:
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a catheter body having a central axis extending in a longitudinal direction and a fluid injection lumen; at least three needle guiding elements adapted to move toward an interior wall of a target vessel, wherein the at least three needle guiding elements are configured to center a portion of the catheter body; and at least three injection needles guided by the at least three needle guiding elements toward the interior wall of the target vessel, wherein the at least three injection needles curve backward in a proximal direction as the at least three injection needles extend from distal ends of the at least three needle guiding elements, each injection needle having an injection lumen in fluid communication with the fluid injection lumen of the catheter body, the at least three injection needles are adapted to penetrate the interior wall of the target vessel and deliver a fluid. - View Dependent Claims (16, 17, 18, 19)
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Specification