Multiple electrode ablation apparatus and method
First Claim
1. An ablation apparatus, comprising:
- an introducer including with a distal end sufficiently sharp to penetrate tissue;
an energy delivery device configured to be coupled to an energy source, the energy delivery device including a first electrode and a second electrode each having a tissue piercing distal portion, the first and second electrodes being at least partially positionable in the introducer and deployable from the introducer at a selected tissue site to an expanded state of deployed first and second electrodes that distend laterally away from the introducer with a radius of curvature to form a shaped array of deployed electrodes at the tissue site when positioned at the selected tissue site, wherein the first electrode distal portion and the second electrode distal portion are each at least partially made of a shaped memory alloy material that displays stress induced martensite behavior above body temperature; and
a cable coupling the energy source to the energy delivery device.
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Abstract
An ablation apparatus includes an introducer with a distal end sufficiently sharp to penetrate tissue. An energy delivery device is configured to be coupled to an energy source. The energy delivery device includes a first electrode and a second electrode each with a tissue piercing distal portion. The first and second electrodes are at least partially positionable in the introducer and deployable from the introducer at a selected tissue site to an expanded state. In the expanded state the deployed first and second electrodes distend laterally away from the introducer with a radius of curvature to form a shaped array of deployed electrodes at the tissue site when positioned at the selected tissue site. The first electrode distal portion and the second electrode distal portion are each at least partially made of a shaped memory alloy material that displays stress induced martensite behavior above body temperature. A cable couples the energy source to the energy delivery device.
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Citations
48 Claims
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1. An ablation apparatus, comprising:
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an introducer including with a distal end sufficiently sharp to penetrate tissue; an energy delivery device configured to be coupled to an energy source, the energy delivery device including a first electrode and a second electrode each having a tissue piercing distal portion, the first and second electrodes being at least partially positionable in the introducer and deployable from the introducer at a selected tissue site to an expanded state of deployed first and second electrodes that distend laterally away from the introducer with a radius of curvature to form a shaped array of deployed electrodes at the tissue site when positioned at the selected tissue site, wherein the first electrode distal portion and the second electrode distal portion are each at least partially made of a shaped memory alloy material that displays stress induced martensite behavior above body temperature; and a cable coupling the energy source to the energy delivery device. - 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, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A method for creating an ablation volume in a selected tissue mass, comprising:
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providing an ablation apparatus including an introducer, an energy source, a first electrode and a second electrode at least partially positionable in the introducer, wherein a first electrode distal portion and a second electrode distal portion are each at least partially made of a shaped memory alloy material that displays stress induced martensite behavior above body temperature; advancing the introducer through tissue to the selected tissue site; applying energy to the first and second electrode distal portions while positioned in the introducer and creating a stress induced martensitic state in the first and second electrodes at a temperature above body temperature; advancing the first and second electrodes from the introducer to surround a selected tissue mass; delivering energy from the energy source to the first and second electrodes; and creating an ablation volume in the selected tissue mass. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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Specification