System and method for adaptive RF ablation
First Claim
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1. A medical method, comprising:
- advancing an ablation element of a medical device into contact with tissue to be treated;
supplying power from a power source to the ablation element to ablate the tissue;
monitoring a temperature of the ablation element;
then determining a state of contact between the ablation element and the tissue based on the temperature of the ablation element;
then, after a determination that the state of contact is that continuous tissue contact has been lost, initiating a reduction in the power supplied by the power source; and
when the ablation element regains continuous tissue contact; and
the state of regained continuous tissue contact has continued for at least three seconds, then initiating an increase in the power supplied by the power source.
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Abstract
A medical method, device, and system are provided, including advancing an ablation element of a medical device into contact with tissue to be treated, selecting a power level of energy to ablate the tissue, delivering energy at the selected power level to the ablation element, determining whether the ablation element is in continuous contact with the tissue, and reducing the selected power level when the ablation element ceases to be in continuous contact with the tissue.
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Citations
12 Claims
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1. A medical method, comprising:
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advancing an ablation element of a medical device into contact with tissue to be treated; supplying power from a power source to the ablation element to ablate the tissue; monitoring a temperature of the ablation element; then determining a state of contact between the ablation element and the tissue based on the temperature of the ablation element; then, after a determination that the state of contact is that continuous tissue contact has been lost, initiating a reduction in the power supplied by the power source; and when the ablation element regains continuous tissue contact; and the state of regained continuous tissue contact has continued for at least three seconds, then initiating an increase in the power supplied by the power source. - View Dependent Claims (2, 3, 4, 5)
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6. A medical method, comprising:
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advancing an electrode of a medical device into contact with tissue to be treated; delivering energy from an energy source to the electrode; monitoring an instantaneous temperature of the electrode; selecting a desired temperature and a threshold variation; calculating an average temperature of the electrode during the energy delivery to the electrode; calculating a difference between the instantaneous electrode temperature and the average electrode temperature; calculating a continuity value by subtracting the difference from the desired temperature; determining a state of contact between the electrode and the tissue and assigning a contact status, the contact status based on the continuity value and the threshold variation, a contact status of continuous contact being assigned when the continuity value is less than the threshold variation and a contact status of one of intermittent contact and no contact being assigned when the continuity value is greater than the threshold variation; initiating a reduction in the energy delivered by the energy source when the contact status is one of intermittent contact and no contact; then re-evaluating contact between the electrode and the tissue and re-assigning the contact status; determining whether the contact status is continuous contact; and when the contact status is continuous contact and has been continuous contact for at least three seconds, then initiating an increase in the energy delivered by the energy source. - View Dependent Claims (7, 8, 9, 10)
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11. A medical method, comprising:
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advancing an electrode of a medical device into contact with tissue to be treated; monitoring a temperature of the electrode; selecting a desired temperature and a threshold value; delivering energy from an energy source at a duty cycle value to the electrode; setting a duty cycle limit equal to an initial duty cycle value; limiting the energy to a maximum of the duty cycle limit when the threshold value exceeds the temperature; and after the temperature has exceeded the threshold value continuously for at least three seconds, then increasing the duty cycle limit. - View Dependent Claims (12)
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Specification