Triaxial antenna for microwave tissue ablation
First Claim
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1. A system for microwave ablation for receiving a microwave frequency from a source of microwave electrical power and comprising:
- a probe adapted for insertion into a human tissue, the probe comprising;
a first conductor;
a second conductor coaxially surrounding an extent of the first conductor but insulated therefrom, wherein the first and second conductors are adapted to receive electrical conductors communicating with the source of microwave electrical power; and
a third conductor coaxially surrounding an extent of the second conductor that is coaxially surrounding the extent of the first conductor;
wherein the first conductor extends beyond the second conductor by a distance of L2;
wherein the second conductor extends beyond the third conductor by a distance of L1;
and wherein L1 and L2 are each in length an odd multiple of a quarter wavelength of the microwave frequency conducted through the probe as affected by the human tissue when substantially an entire length of the probe over distance L1 and L2 is in contact with and surrounded by the human tissue and when the microwave frequency conducted through the probe is provided at a frequency of approximately 2.45 Ghz.
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Abstract
An improved antenna for microwave ablation uses a triaxial design which reduces reflected energy allowing higher power ablation and/or a smaller diameter feeder line to the antenna.
226 Citations
30 Claims
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1. A system for microwave ablation for receiving a microwave frequency from a source of microwave electrical power and comprising:
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a probe adapted for insertion into a human tissue, the probe comprising; a first conductor; a second conductor coaxially surrounding an extent of the first conductor but insulated therefrom, wherein the first and second conductors are adapted to receive electrical conductors communicating with the source of microwave electrical power; and a third conductor coaxially surrounding an extent of the second conductor that is coaxially surrounding the extent of the first conductor; wherein the first conductor extends beyond the second conductor by a distance of L2; wherein the second conductor extends beyond the third conductor by a distance of L1; and wherein L1 and L2 are each in length an odd multiple of a quarter wavelength of the microwave frequency conducted through the probe as affected by the human tissue when substantially an entire length of the probe over distance L1 and L2 is in contact with and surrounded by the human tissue and when the microwave frequency conducted through the probe is provided at a frequency of approximately 2.45 Ghz. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of microwave ablation comprising the steps of:
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(a) inserting a probe into a human tissue, the probe having a first conductor;
a second conductor coaxially surrounding an extent of the first conductor, but insulated therefrom; and
a third conductor coaxially surrounding an extent of the second conductor that is coaxially surrounding the extent of the first conductor, wherein the first conductor extends a length L2 from the second conductor and the second conductor extends a length L1 from the third conductor;(b) supplying the first and second conductors with microwave electrical power from a microwave generator; (c) tuning the probe by adjusting L1 with respect to L2 to reduce reflected power, wherein L1 and L2 are each in length an odd multiple of a quarter wavelength of a microwave frequency conducted through the probe as affected by the human tissue when substantially an entire length of the probe over distance L1 and L2 is in contact with and surrounded by the human tissue and when the microwave frequency conducted through the probe is provided at a frequency of approximately 2.45 Ghz; and (d) providing current flow between exposed portions of the first and second conductors ablating the human tissue in a region of the exposed portions of the first and second conductors.
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17. A probe for microwave ablation comprising:
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a first conductor; a tubular second conductor coaxially around the first conductor but insulated therefrom; and a tubular third conductor coaxially around the first and second conductor; wherein the first conductor extends beyond the second conductor into tissue, when a proximal end of the probe is inserted into a body for microwave ablation, for microwave frequency current flow between the first and second conductors through the tissue; wherein the second conductor is surrounded by an outer insulating dielectric or an insulating air gap is provided between the second conductor and the third conductor; and
whereinthe second conductor extends beyond the third conductor into tissue when an end of the probe is inserted into the body for microwave ablation to provide improved tuning of the probe limiting power dissipated in the probe outside of exposed portions of the first and second conductors; and the first conductor extends beyond the second conductor by a distance of L2 and the second conductor extends beyond the third conductor by a distance of L1 wherein L1 and L2 are odd multiples of a quarter wavelength of a microwave frequency that the probe is configured to receive. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification