System for controlling tissue ablation using temperature sensors
First Claim
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1. A method of body tissue ablation, comprising the steps of:
- inserting a probe into a body of a living subject;
urging the probe into contact with a tissue in the body;
generating ablative energy at a power output level at a level of current;
transmitting the generated energy into the tissue via the probe;
determining a measured temperature of the tissue and a measured power level of the generated energy during the step of transmitting the generated energy into tissue via the probe, via a temperature sensor and a power sensor;
determining a power deviation by comparing a difference between the measured power level and a predetermined target power level;
determining a temperature deviation by comparing a difference between the measured temperature of the tissue and a predetermined target temperature;
calculating a target current value from a control function; and
via a controller, controlling the power output level responsively to the calculated target current value by incrementally adjusting the level of current to the target current value gradually over time to generate energy at a new power output level until the measured temperature of the tissue and the measured power level each reach the predetermined target power level and the predetermined target temperature respectively, wherein the control function is;
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Abstract
Body tissue ablation is carried out by inserting a probe into a body of a living subject, urging the probe into contact with a tissue in the body, generating energy at a power output level, and transmitting the generated energy into the tissue via the probe. While transmitting the generated energy the ablation is further carried out by determining a measured temperature of the tissue and a measured power level of the transmitted energy, and controlling the power output level responsively to a function of the measured temperature and the measured power level. Related apparatus for carrying out the ablation is also described.
51 Citations
14 Claims
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1. A method of body tissue ablation, comprising the steps of:
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inserting a probe into a body of a living subject; urging the probe into contact with a tissue in the body; generating ablative energy at a power output level at a level of current; transmitting the generated energy into the tissue via the probe; determining a measured temperature of the tissue and a measured power level of the generated energy during the step of transmitting the generated energy into tissue via the probe, via a temperature sensor and a power sensor; determining a power deviation by comparing a difference between the measured power level and a predetermined target power level; determining a temperature deviation by comparing a difference between the measured temperature of the tissue and a predetermined target temperature; calculating a target current value from a control function; and via a controller, controlling the power output level responsively to the calculated target current value by incrementally adjusting the level of current to the target current value gradually over time to generate energy at a new power output level until the measured temperature of the tissue and the measured power level each reach the predetermined target power level and the predetermined target temperature respectively, wherein the control function is; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An ablation apparatus, comprising:
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a catheter having a distal portion for insertion into a body cavity of a living subject and configured to bring the distal portion into contact with a tissue in the body cavity; a power generator for generating ablative energy at a power output level having a level of current; an ablation electrode disposed on the distal portion configured to accept the energy from the power generator via the catheter and to conduct the energy to the tissue for ablation thereof; a temperature sensor disposed on the distal portion for determining a temperature of the ablation electrode; and a processor operative for determining a measured temperature of the tissue and a measured power level of the energy conducted through the ablation electrode, the processor configured to;
determine a power deviation by comparing a difference between the measured power level and a predetermined target power level;
determine a temperature deviation by comparing a difference between the measured temperature of the tissue and a predetermined target temperature;
calculate a target current value from a control function; and
control the power output level responsively to the calculated target current value by incrementally adjusting the level of current to the target current value gradually over time to generate energy at a new power output level until the measured temperature of the tissue and the measured power level each reach the predetermined target power level and the predetermined target temperature respectively, wherein the control function is; - View Dependent Claims (11, 12, 13, 14)
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Specification