Ablation catheter assembly and method for isolating a pulmonary vein
First Claim
1. A catheter assembly for treatment of cardiac arrhythmia comprising:
- a catheter body including;
a proximal portion, an intermediate portion extending from the proximal portion and defining a longitudinal axis, a distal portion extending from the intermediate portion and forming a helix, a first lumen extending from the proximal portion to the distal portion, an ablation section formed along the coil and defining a loop transverse to the longitudinal axis, the ablation section being formed of a microporous material in fluid communication with the first lumen to irrigate fluid from the first lumen to an exterior surface of the ablation section;
at least one electrode associated with the ablation section; and
a fluid source for supplying a liquid to the first lumen;
wherein upon activation, the electrode supplies an ablation energy to fluid irrigated to the exterior surface of the ablation section for ablating a continuous, closed lesion pattern.
1 Assignment
0 Petitions
Accused Products
Abstract
A catheter assembly and method for treatment of cardiac arrhythmia. In one preferred embodiment, the catheter assembly includes a catheter body, at least one electrode, and a fluid source. The catheter body includes a proximal portion, an intermediate portion, a distal portion, a first lumen, and an ablation section. The intermediate portion extends from the proximal portion and defines a longitudinal axis. The distal portion extends from the intermediate portion and forms a helix or coil. The first lumen extends from the proximal portion to the distal portion. Finally, the ablation section is formed along the helix of the distal portion and defines a loop transverse to the longitudinal axis. The ablation section is, in one preferred embodiment, comprised of a microporous material in fluid communication with the first lumen so as to irrigate fluid from the first lumen to an exterior surface of the ablation section. The electrode is associated with the ablation section. Finally, the fluid source is provided to supply a conductive fluid to the first lumen. With this configuration, upon activation, the electrode supplies an ablation energy to fluid irrigated to the exterior surface of the ablation section, thereby ablating a continuous, closed lesion pattern. During use, for example, the catheter assembly can ablate a closed lesion pattern corresponding with the loop defined by the ablation section on a chamber wall about a pulmonary vein ostium to electrically isolate the pulmonary vein from the left atrium. In one preferred embodiment, the ablation section is comprised of a high density, expanded PTFE material. In another preferred embodiment, a shaping wire is slidably disposed within the catheter body to selectively dictate the desired helical shape of the distal portion
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Citations
65 Claims
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1. A catheter assembly for treatment of cardiac arrhythmia comprising:
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a catheter body including;
a proximal portion, an intermediate portion extending from the proximal portion and defining a longitudinal axis, a distal portion extending from the intermediate portion and forming a helix, a first lumen extending from the proximal portion to the distal portion, an ablation section formed along the coil and defining a loop transverse to the longitudinal axis, the ablation section being formed of a microporous material in fluid communication with the first lumen to irrigate fluid from the first lumen to an exterior surface of the ablation section;
at least one electrode associated with the ablation section; and
a fluid source for supplying a liquid to the first lumen;
wherein upon activation, the electrode supplies an ablation energy to fluid irrigated to the exterior surface of the ablation section for ablating a continuous, closed lesion pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A catheter assembly for treatment of cardiac arrhythmia comprising:
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a catheter body including;
a proximal portion, a distal portion comprised of a flexible material, an ablation section defined along the distal portion, a first lumen extending from the proximal portion to the distal portion;
at least one electrode associated with the ablation section; and
a shaping wire moveably disposed within the first lumen, the shaping wire including a proximal segment and a distal segment, wherein the distal segment is formed of a shape memory material configured to revert to a helical shape;
wherein upon advancement of the distal segment within the distal portion, the distal portion assumes the helical shape of the distal segment and the ablation section forms a loop. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A catheter assembly for treatment of cardiac arrhythmia comprising:
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a catheter body including;
a proximal portion, an intermediate portion extending from the proximal portion and defining a longitudinal axis, a distal portion extending from the intermediate portion and comprised of a flexible material, a first lumen extending from the proximal portion to the distal portion, an ablation section formed along the distal portion and formed of a microporous material in fluid communication with the first lumen to irrigate fluid from the first lumen to an exterior surface of the ablation section;
at least one electrode associated with the ablation section;
a fluid source for supplying a fluid to the first lumen; and
a shaping wire slidably disposed within the catheter body, the shaping wire including a proximal segment and a distal segment, wherein the distal segment is formed of a shape memory material configured to revert to a helical shape such that upon advancement of the distal segment within the distal portion, the distal portion assumes the helical shape of the distal segment and the ablation section forms a loop transverse to the longitudinal axis;
wherein upon activation, the electrode supplies an ablation energy to fluid irrigated to the exterior surface of the ablation section for ablating a continuous, closed lesion pattern.
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41. A method for forming an ablation pattern to electrically isolate a vessel from a chamber, the vessel having an ostium formed at a chamber wall, for treatment of cardiac arrhythmia, the method comprising:
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selecting a catheter assembly including a catheter body, a first shaping wire, and at least one electrode, the catheter body including a proximal portion, a distal portion, and a first lumen extending from the proximal portion through the distal portion, the distal portion including an ablation section, wherein the first shaping wire is selectively disposed within the first lumen and includes a proximal segment and a distal segment formed to selectively assume a first helical shape, and further wherein the at least one electrode is associated with the ablation section;
guiding the distal portion into the chamber;
forming the distal portion to a helical configuration with the distal segment of the shaping wire such that the ablation section forms a loop;
directing the distal portion such that the ablation section contacts the chamber wall about the vessel ostium; and
energizing the electrode to ablate a continuous, closed lesion pattern about the vessel ostium to electrically isolate the vessel from the chamber. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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56. A method for forming an ablation pattern to electrically isolate a vessel from a chamber, the vessel having ostium formed at a chamber wall, for treatment of cardiac arrhythmia, the method comprising:
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selecting a catheter assembly including a delivery catheter, an ablation catheter and at least one electrode, wherein the delivery catheter includes a lumen terminating at an opening and a distal locator extending distal the opening, and further wherein the ablation catheter includes a proximal portion and a distal portion that selectively assumes a helical shape and includes an ablation section forming a loop, and further wherein the at least one electrode is associated with the ablation section;
guiding the distal locator into the chamber;
locating the vessel with the distal locator;
deploying the distal portion from the opening;
advancing the distal portion over the distal locator such that the ablation section contacts the chamber wall about the vessel ostium; and
energizing the electrode to ablate a continuous, closed lesion pattern about the vessel ostium to electrically isolate the vessel from the chamber. - View Dependent Claims (57, 58, 59, 60, 61, 62, 63, 64, 65)
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Specification