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 an exterior of the inflatable balloon; and
a sensing circuitry mounted to the support, wherein an inductance of the sensing circuitry varies according to a relative position between a first sensing element on a first surface of the ablation energy delivery element support and at least one of a set of second sensing elements on a second surface of the ablation energy delivery element support opposite the first surface, wherein the first sensing element contacts at least one sensing element of the set of second sensing elements.
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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 with 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 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 electrodes that sense the amount of the overlap.
448 Citations
12 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 an exterior of the inflatable balloon; and a sensing circuitry mounted to the support, wherein an inductance of the sensing circuitry varies according to a relative position between a first sensing element on a first surface of the ablation energy delivery element support and at least one of a set of second sensing elements on a second surface of the ablation energy delivery element support opposite the first surface, wherein the first sensing element contacts at least one sensing element of the set of second sensing elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification