Helically wound radio-frequency emitting electrodes for creating lesions in body tissue
First Claim
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1. A device for use in a tissue ablation system, comprisingan element having an axis;
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Abstract
A device for ablating tissue within the body has an element with an energy emitting region helically wound about and along the axis of the element. The element emits energy to create a lesion in body tissue. A sheath of a non-energy emitting material is movable over the region to adjust the impedance of the region.
649 Citations
28 Claims
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1. A device for use in a tissue ablation system, comprising
an element having an axis; - and
an energy emitting region, including wound lengths of energy emitting material juxtaposed with wound lengths of non-energy emitting material, helically wound about and along the axis of the element for emitting energy to create a lesion in body tissue. - View Dependent Claims (2, 3, 4)
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5. A device for ablating tissue within the body, comprising:
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an element defining an axis and including a helical energy emitting region along the axis, the helical energy emitting region including a plurality of windings substantially abutting one another; a source of ablation energy connected to the energy emitting region; and an electrode connected to the source of ablation energy, separate and distinct from the element, adapted to be located on the outer surface of the body; wherein current emitted from the helical energy emitting region is received by the electrode to create a return path. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A device for use in a tissue ablation system, comprising:
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a support element having an axis and an electrically non-conducting portion; and a plurality of helical ablation elements defining respective proximal and distal ends and adapted to be coupled to a source of ablation energy and carried by the electrically non-conducting portion of the support element such that each element occupies a respective region of the non-conducting portion extending from the proximal end of the element to the distal end of the element, wherein the respective regions are longitudinally spaced from and non-overlapping with any other region. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A tissue ablation system, comprising:
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a support element having an axis and an electrically non-conducting portion; a plurality of helical ablation elements defining respective proximal and distal ends and carried by the electrically non-conducting portion of the support element such that each element occupies a respective region of the non-conducting portion extending from the proximal end of the element to the distal end of the element, wherein the respective regions are longitudinally spaced from and non-overlapping with any other region, the predetermined length being such that when the helical ablation elements simultaneously transmit ablation energy a continuous lesion is formed that spans the non-conducting region; and a source of ablation energy connected to each of the helical ablation elements and adapted to simultaneously supply ablation energy to each of the helical ablation elements. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification