Distal balloon impedance and temperature recording to monitor pulmonary vein ablation and occlusion
AssigneeMedtronic CryoCath LP
InventorsBoaz Avitall, Catherine R. Condie
Life of this patent
Estimating the term…
Abstract
A cryoablation method, system, and device that allows for real-time and accurate assessment and monitoring of PV occlusion and lesion formation without the need for expensive imaging systems and without patient exposure to radiation. The system includes a cryoballoon catheter with a cryoballoon, a distal electrode, a proximal electrode, and a temperature sensor. Impedance measurements recorded by the electrodes may be used to predict ice formation, quality of pulmonary vein occlusion, and lesion formation.
Claims19
A cryoablation device, comprising:
- an elongate body having a proximal portion and a distal portion opposite the proximal portion;
- an expandable element coupled to the elongate body;
- a first electrode disposed proximate the expandable element, the first electrode being a reference electrode;
- a shaft disposed distal to the expandable element;
- and
- a plurality of electrodes disposed on the shaft, each of the plurality of electrodes being spaced a distance apart.
A system for cryoablating tissue, comprising:
- a cryoablation device, including:
- an elongate body having a proximal portion and a distal portion opposite the proximal portion;
- a cryoballon coupled to the distal portion of the elongate body;
- a first electrode being a reference electrode;
- a shaft disposed distal to the cryoballon;
- a plurality of electrodes disposed on the shaft, each of the plurality of electrodes being spaced a distance apart;
- and
- a console including a processor, the processor configured to:
- receive impedance measurements recorded by the first electrode and the plurality of electrodes;
- compare impedance measured by the first electrode and the plurality of electrodes;
- and
- determine if the cryoballoon is creating a permanent lesion, the determination being based upon at least one of the impedance measurement of the first electrode and the impedance measurement of the plurality of electrodes.
A system for cryoablating tissue, comprising:
- a cryoablation device, including:
- an elongate body having a proximal portion and a distal portion opposite the proximal portion;
- a cryoballoon coupled to the distal portion of the elongate body;
- a reference electrode disposed proximal to the cryoballoon;
- a shaft disposed distal to the cryoballoon;
- a plurality of electrodes disposed circumferentially about the shaft, each electrode being spaced an equal distance apart, and each of the electrodes abutting the cryoballoon;
- and
- at least one thermocouple disposed distal to the reference electrode and disposed 2 mm distal to the plurality of electrodes;
- a console including a processor, the processor configured to:
- receive impedance measurements recorded by the reference electrode and the plurality of electrodes;
- receive temperature measurements recorded by the at least one thermocouple;
- compare impedance measured by the reference electrode and the electrodes;
- and
- determine if the cryoballoon is creating a permanent lesion, the determination being based upon at least one of the impedance measurement of the reference electrode, the impedance measurement of the plurality of electrodes, and the temperature measurement by the at least one thermocouple.
Dependencies are inferred from the claim text.