Impedance computation for ablation therapy
First Claim
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1. An ablation system for delivering therapy to treat a condition of a human patient, the ablation system comprising:
- a catheter configured for insertion through a urethra or other orifice to a site within the patient, wherein the catheter comprises first and second electrodes adapted for delivering energy to tissue;
a return electrode positionable interiorly or exteriorly of the patient to operate as a destination for the energy delivered via the first and second electrodes; and
a therapy delivery device coupled to the catheter, the therapy delivery device including;
a generator configured to deliver energy to the tissue of a target tissue location of the patient via the first electrode, the second electrode, and the return electrode; and
a processor having instructions configured for (a) computing one or more parameters of an electrical interaction between the first and second electrodes and the return electrode using a star-configuration resistor model in which all resistors of the star-configuration resistor model are coupled to each other at a common node and (b) adjusting, based on at least one of the one or more computed parameters of the star-configuration resistor model, one or more parameters of the delivered therapy, wherein the one or more computed parameter of the star-configuration resistor model comprises a common impedance to the return electrode of the star-configuration resistor model.
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Abstract
This disclosure describes impedance computation techniques that may reduce the effect of crosstalk, thus generating more accurate impedance measurements. In particular, an ablation system models the electrical interaction among the active electrodes and a common return electrode using a star-configuration resistor model. The ablation system computes one or more parameters of the star-configuration resistor model and adjusts the therapy based on at least the computed parameters of the star-configuration resistor model.
36 Citations
11 Claims
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1. An ablation system for delivering therapy to treat a condition of a human patient, the ablation system comprising:
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a catheter configured for insertion through a urethra or other orifice to a site within the patient, wherein the catheter comprises first and second electrodes adapted for delivering energy to tissue; a return electrode positionable interiorly or exteriorly of the patient to operate as a destination for the energy delivered via the first and second electrodes; and a therapy delivery device coupled to the catheter, the therapy delivery device including; a generator configured to deliver energy to the tissue of a target tissue location of the patient via the first electrode, the second electrode, and the return electrode; and a processor having instructions configured for (a) computing one or more parameters of an electrical interaction between the first and second electrodes and the return electrode using a star-configuration resistor model in which all resistors of the star-configuration resistor model are coupled to each other at a common node and (b) adjusting, based on at least one of the one or more computed parameters of the star-configuration resistor model, one or more parameters of the delivered therapy, wherein the one or more computed parameter of the star-configuration resistor model comprises a common impedance to the return electrode of the star-configuration resistor model. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An ablation system for delivering therapy to treat a condition of a human patient, the ablation system comprising:
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a first electrode and a second electrode both configured to deliver energy to tissue; means for inserting, through a urethra or other orifice, the first electrode and the second electrode to a site within the patient; a return electrode positionable interiorly or exteriorly of the patient to operate as a destination for the energy delivered via the first and second electrodes; means for delivering the energy to the tissue of a target tissue location of the patient via the first electrode, the second electrode, and the return electrode; and means for; computing one or more parameters of an electrical interaction between the first and second electrodes and the return electrode using a star-configuration resistor model in which all resistors of the star-configuration resistor model are coupled to each other at a common node, wherein the one or more computed parameters of the star-configuration resistor model comprises a common impedance to the return electrode of the star-configuration resistor model; and adjusting, based on at least one of the one or more computed parameters of the star-configuration resistor model, one or more parameters of the delivered therapy.
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Specification