Method of controlling thermal therapy
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United States of America Patent
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Dec 3, 2002
Issued Date -
N/A
app pub date -
Apr 20, 2000
filing date -
Dec 11, 1998
priority date (Note) -
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Abstract
A thermal therapy method includes inserting an applicator including an energy-emitting device into a body cavity such as a urethra adjacent a targeted tissue region such as a prostate, energizing the energy-emitting device, and circulating coolant between the energy-emitting device and a wall of the body cavity. The therapy is controlled by decreasing a temperature of the coolant and continually adjusting coolant temperature based on therapy parameters. The applicator, or selected tissue at a predetermined depth from the wall of the body cavity, is maintained at a temperature corresponding to a predetermined applicator temperature profile by adjusting a power level provided to the energy-emitting device. In one embodiment involving treatment of the prostate, rectal temperature is monitored and, upon sensing a rectal temperature that exceeds a predetermined threshold, the temperature of the coolant is increased to force a reduction in power provided to the energy-emitting device to maintain the applicator at the temperature corresponding to the predetermined applicator temperature profile.
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