Tissue ablation device assembly and method for electrically isolating a pulmonary vein ostium from an atrial wall
First Claim
1. A tissue ablation system for treating atrial arrhythmia by ablating a circumferential region of tissue at a location where a pulmonary vein extends from an atrium, comprising:
- a delivery member having a proximal end portion and a distal end portion with a longitudinal axis and a radial axis;
a cantilevered housing having a first end, a second end, and a distal wall, that is located at least in part along the distal end portion, and that is mechanically adjustable between a first condition and a second condition, wherein the first condition the distal wall is substantially radially collapsed such that the housing is adapted to be delivered through a delivery sheath into the atrium, and wherein the second condition the second end and the distal wall are radially extended at least in part from the longitudinal axis, the distal wall having a distal orientation and a distal facing surface located along a circumferential region that surrounds the longitudinal axis;
a mechanical positioning assembly coupled to the first end of the housing to mechanically adjust the housing between the first and second conditions; and
an ablation element cooperating with the housing and which is adapted to ablatively couple to a circumferential area normal to the distal facing surface along the circumferential region when the housing is in the second position, wherein the ablation element and distal facing surface are configured such that the circumferential area coincides with the circumferential region of tissue when the housing is adjusted to the second condition at the location.
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Accused Products
Abstract
This invention is related to a tissue ablation system and method that treats atrial arrhythmia by ablating a circumferential region of tissue at a location where a pulmonary vein extends from an atrium. The system includes a circumferential ablation member with an ablation element and also includes a delivery assembly for delivering the ablation member to the location. The circumferential ablation member is generally adjustable between different configurations to allow both the delivery through a delivery sheath into the atrium and the ablative coupling between the ablation element and the circumferential region of tissue.
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Citations
24 Claims
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1. A tissue ablation system for treating atrial arrhythmia by ablating a circumferential region of tissue at a location where a pulmonary vein extends from an atrium, comprising:
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a delivery member having a proximal end portion and a distal end portion with a longitudinal axis and a radial axis;
a cantilevered housing having a first end, a second end, and a distal wall, that is located at least in part along the distal end portion, and that is mechanically adjustable between a first condition and a second condition, wherein the first condition the distal wall is substantially radially collapsed such that the housing is adapted to be delivered through a delivery sheath into the atrium, and wherein the second condition the second end and the distal wall are radially extended at least in part from the longitudinal axis, the distal wall having a distal orientation and a distal facing surface located along a circumferential region that surrounds the longitudinal axis;
a mechanical positioning assembly coupled to the first end of the housing to mechanically adjust the housing between the first and second conditions; and
an ablation element cooperating with the housing and which is adapted to ablatively couple to a circumferential area normal to the distal facing surface along the circumferential region when the housing is in the second position, wherein the ablation element and distal facing surface are configured such that the circumferential area coincides with the circumferential region of tissue when the housing is adjusted to the second condition at the location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A tissue ablation system for treating atrial arrhythmia by ablating a circumferential region of tissue at a location where a pulmonary vein extends from an atrium, comprising:
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a delivery member having a proximal end portion and a distal end portion with a longitudinal axis and a radial axis;
a cantilevered housing with a first end, a second end and a distal wall, that is located at least in part along the distal end portion, and that is adjustable between a first condition and a second condition, wherein the first condition the distal wall is substantially radially collapsed such that the housing is adapted to be delivered through a delivery sheath into the atrium, and wherein the second condition the second end and the distal wall are radially extended at least in part from the longitudinal axis, the distal wall having a distal orientation and a distal facing surface located along a circumferential region that surrounds the longitudinal axis;
a positioning assembly coupled to the housing to adjust the housing between the first and second conditions; and
an ablation element cooperating with the housing and which is adapted to ablatively couple to a circumferential area normal to the distal facing surface along the circumferential region when the housing is in the second position, wherein the ablation element and distal facing surface are configured such that the circumferential area coincides with the circumferential region of tissue when the housing is adjusted to the second condition at the location.
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24. A circumferential ablation member for ablating a circumferential region of tissue in a body lumen, comprising:
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a cantilevered housing with a first end, a second end, and a distal wall, and that is adjustable between a first condition and a second condition about a longitudinal axis, wherein the first condition the distal wall is substantially radially collapsed such that the housing is adapted to be delivered through a delivery sheath into a body lumen, and wherein the second condition the second end and the distal wall are radially extended at least in part from the longitudinal axis, the distal wall having a distal orientation and a distal facing surface located along a circumferential path that surrounds the longitudinal axis; and
an ablation element cooperating with the housing and which is adapted to ablatively couple to a circumferential area normal to the distal facing surface along the circumferential path when the housing is in the second position, wherein the circumferential area is ablatively coupled with the circumferential region of tissue when the housing is adjusted to the second condition.
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Specification