Impedance computation for ablation therapy
AssigneeMedtronic, Inc.
InventorsNikhil Bhushan, Thomas R. Skwarek, Graham Spall, Keith S. Bosacker
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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.
Claims20
A method for delivering therapy to a patient, the method comprising:
- applying energy under control of a processor to one or both of a first active electrode and a second active electrode, wherein the energy is delivered to a target tissue location of a patient and a return electrode common to the first active electrode and the second active electrode;
- computing via the processor a common impedance to the return electrode;
- computing via the processor a primary impedance between the first active electrode and the return electrode using the common impedance and a secondary impedance between the second active electrode and the return electrode using the common impedance, wherein the computing of the primary impedance and the secondary impedance accounts for crosstalk between the first active electrode and the second active electrode through the target tissue location;
- delivering the therapy to the patient under control of the processor, wherein the energy is applied as one of a portion of the therapy or separate from the therapy;
- and
- adjusting one or more parameters of the therapy based on at least one of the common impedance, the primary impedance, and the secondary impedance.
A therapy delivery device for delivering a therapy comprising:
- a generator configured to generate energy that is delivered to a target location of a patient via a first active electrode and a second active electrode;
- wherein the first active electrode is configured to deliver at least a first portion of the energy to the target tissue location of the patient;
- wherein the second active electrode is configured to deliver at least a second portion of the energy to the target tissue location of the patient;
- a return electrode configured to operate as a destination for the at least first portion and the at least second portion of the energy delivered via the first active electrode and the second active electrode;
- and
- a processor configured to compute a common impedance to the return electrode, a primary impedance between the first active electrode and the return electrode using the common impedance, and a secondary impedance between the second active electrode and the return electrode using the common impedance, wherein computation of the primary impedance and the secondary impedance accounts for crosstalk between the first active electrode and the second active electrode through the target tissue location.
The non-transitory computer-readable storage medium comprising instructions that cause at least one processor to:
- apply energy to one or both of a first active electrode and a second active electrode, wherein the energy is delivered to a target tissue location of a patient and a return electrode common to the first active electrode and the second active electrode;
- compute a common impedance to the return electrode;
- compute a primary impedance between the first active electrode and the return electrode using the common impedance and a secondary impedance between the second active electrode and the return electrode using the common impedance, wherein computation of the primary impedance and the secondary impedance accounts for crosstalk between the first active electrode and the second active electrode through the target tissue location;
- deliver a therapy to the patient, wherein the energy is one of applied as a portion of the therapy or applied separate from the therapy;
- and
- adjust one or more parameters of the therapy based on at least one of the common impedance, the primary impedance, and the secondary impedance.
Dependencies are inferred from the claim text.