Microwave thermometry for microwave ablation systems
First Claim
1. A microwave ablation system comprising:
- a microwave applicator including an antenna configured to deliver microwave energy to ablate tissue;
a microwave generator coupled to the microwave applicator and configured to generate a microwave signal and transmit the microwave signal to the antenna via a transmission network;
a thermometry circuit coupled between the microwave generator and the microwave applicator, the thermometry circuit including a radiometer configured to measure a noise temperature signal and a coupling network coupled to the transmission network and configured to provide a noise temperature signal propagating in the transmission network to the radiometer; and
a controller coupled to the thermometry circuit and configured to calculate a temperature value based on the noise temperature signal,wherein the thermometry circuit further includes;
a first filter configured to isolate the noise temperature signal from the microwave signal and output the noise temperature signal; and
a second filter configured to filter the noise temperature signal output from the first filter.
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Accused Products
Abstract
A microwave ablation system incorporates a microwave thermometer that couples to a microwave transmission network connecting a microwave generator to a microwave applicator to measure noise temperature. The noise temperature is processed to separate out components the noise temperature including the noise temperature of the tissue being treated and the noise temperature of the microwave transmission network. The noise temperature may be measured by a radiometer while the microwave generator is generating the microwave signal or during a period when the microwave signal is turned off. The microwave ablation system may be configured as a modular system having one or more thermometry network modules that are connectable between a microwave applicator and a microwave generator. Alternatively, the modular system includes a microwave generator, a microwave applicator, and a microwave cable that incorporate a microwave thermometry network module.
130 Citations
20 Claims
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1. A microwave ablation system comprising:
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a microwave applicator including an antenna configured to deliver microwave energy to ablate tissue; a microwave generator coupled to the microwave applicator and configured to generate a microwave signal and transmit the microwave signal to the antenna via a transmission network; a thermometry circuit coupled between the microwave generator and the microwave applicator, the thermometry circuit including a radiometer configured to measure a noise temperature signal and a coupling network coupled to the transmission network and configured to provide a noise temperature signal propagating in the transmission network to the radiometer; and a controller coupled to the thermometry circuit and configured to calculate a temperature value based on the noise temperature signal, wherein the thermometry circuit further includes; a first filter configured to isolate the noise temperature signal from the microwave signal and output the noise temperature signal; and a second filter configured to filter the noise temperature signal output from the first filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A microwave ablation device comprising:
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an antenna configured to deliver microwave energy to ablate tissue; and a handle assembly attached to the antenna, the handle assembly including a thermometry circuit coupled to the antenna via a transmission network, the thermometry circuit including; a radiometer configured to measure a noise temperature signal; a coupling network coupled to the transmission network and configured to provide a noise temperature signal propagating in the transmission network to the radiometer; and a controller coupled to the thermometry circuit and configured to calculate a temperature value based on the noise temperature signal, wherein the thermometry circuit further includes; a first filter configured to isolate the noise temperature signal from a microwave signal propagating in the transmission network and output the noise temperature signal; and a second filter configured to filter the noise temperature signal output from the first filter. - View Dependent Claims (19, 20)
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Specification