ELECTRICAL MEANS TO NORMALIZE ABLATIONAL ENERGY TRANSMISSION TO A LUMINAL TISSUE SURFACE OF VARYING SIZE
First Claim
1. A device for treating a body lumen comprising:
- an expandable operative element including an inflatable balloon and an ablation energy delivery element support arranged around the inflatable balloon; and
a sensing circuitry coupled with the support whose resistivity varies according to an amount of expansion of the inflatable balloon.
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Accused Products
Abstract
Methods and devices for measuring the size of a body lumen and a method for ablating tissue that uses the measurement to normalize delivery of ablational energy from an expandable operative element to a luminal target of varying circumference are provided. The method includes inserting into the lumen an expandable operative element having circuitry with resistivity or inductance that varies according to the circumference of the operative element, varying the expansion of the operative element with an expansion medium, measuring the resistivity of the circuitry, and relating the resistivity or inductance to a value for the circumference of the operative element. In some embodiments the sizing circuit includes a conductive elastomer wrapped around the operative element. Other embodiments of the method apply to operative elements that include an overlapping energy delivery element support in which the overlap varies inversely with respect to the state of expansion, and which is configured with sizing electrodes that sense the amount of the overlap.
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Citations
20 Claims
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1. A device for treating a body lumen comprising:
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an expandable operative element including an inflatable balloon and an ablation energy delivery element support arranged around the inflatable balloon; and a sensing circuitry coupled with the support whose resistivity varies according to an amount of expansion of the inflatable balloon. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A device for treating a body lumen comprising:
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an expandable operative element including an inflatable balloon and an ablation energy delivery element support arranged around the inflatable balloon; and a sensing circuitry coupled with the support whose inductance varies according to an amount of expansion of the inflatable balloon. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification