MICROWAVE ANTENNA HAVING A REACTIVELY-LOADED LOOP CONFIGURATION
A microwave ablation system is provided. The microwave ablation system includes a power source. A microwave antenna is adapted to connect to the power source via a coaxial cable feed including an inner conductor defining a portion of a radiating section of the microwave antenna, an outer conductor and dielectric shielding. The inner conductor loops back around and toward the outer conductor of the coaxial cable feed such that a distal end of the inner conductor is operably disposed adjacent the dielectric shielding. The inner conductor includes one or more reactive components disposed thereon forming a reactively-loaded loop configuration configured to maximize delivery of microwave energy from the power source to tissue such that a desired effect to tissue is achieved.
The present application is a continuation application of U.S. patent application Ser. No. 14/189,769, filed on Feb. 25, 2014, which is a continuation application of U.S. patent application Ser. No. 12/826,902, now U.S. Pat. No. 8,672,933, filed on Jun. 30, 2010, the entire contents of each of which is incorporated by reference herein.
BACKGROUND1. Technical Field
The present disclosure relates to microwave antennas. More particularly, the present disclosure relates to microwave antennas having a reactively-loaded loop configuration defining a portion of a radiating section of the microwave antenna.
2. Background of Related Art
Microwave ablation procedures, e.g., such as those performed for menorrhagia, are typically done to ablate the targeted tissue to denature or kill the tissue. Many procedures and types of devices utilizing electromagnetic radiation therapy are known in the art. Such microwave therapy is typically used in the treatment of tissue and organs such as the prostate, heart, and liver.
One non-invasive procedure generally involves the treatment of tissue (e.g., a tumor) underlying the skin via the use of microwave energy. The microwave energy is able to non-invasively penetrate the skin to reach the underlying tissue. Typically, microwave energy is generated by a power source, e.g., microwave generator, and transmitted to tissue via a microwave antenna that is fed with a coaxial cable that operably couples to a radiating section of the microwave antenna.
For optimal energy delivery efficiency from the microwave generator to the microwave antenna, impedance associated with the coaxial cable, the radiating section and/or tissue need to equal to one another, i.e., an impedance match between the coaxial cable, the radiating section and/or tissue. In certain instances, an impedance mismatch may be present between the coaxial cable, the radiating section and/or tissue, and the energy delivery efficiency from the microwave generator to the microwave antenna is compromised, e.g., decreased, which, in turn, may compromise a desired effect to tissue, e.g., ablation to tissue.
SUMMARYThe present disclosure provides a microwave ablation system. The microwave ablation system includes a power source. A microwave antenna is adapted to connect to the power source via a coaxial cable feed including an inner conductor defining a portion of a radiating section of the microwave antenna, an outer conductor and dielectric shielding. The inner conductor loops back around and toward the outer conductor of the coaxial cable feed such that a distal end of the inner conductor is operably disposed adjacent the dielectric shielding. The inner conductor includes one or more reactive components disposed thereon forming a reactively-loaded loop configuration.
The present disclosure provides a microwave antenna adapted to connect to a power source for performing a microwave ablation procedure. The microwave antenna includes a coaxial cable feed including an inner conductor defining a portion of a radiating section of the microwave antenna, an outer conductor and dielectric shielding. The inner conductor loops back around and toward the outer conductor of the coaxial cable feed such that a distal end of the inner conductor is operably disposed adjacent the dielectric shielding. The inner conductor includes one or more reactive components disposed thereon forming a reactively-loaded loop configuration.
The above and other aspects, features, and advantages of the present disclosure will become more apparent in light of the following detailed description when taken in conjunction with the accompanying drawings in which:
Embodiments of the presently disclosed microwave antenna are described in detail with reference to the drawing figures wherein like reference numerals identify similar or identical elements. As used herein and as is traditional, the term “distal” refers to the portion which is furthest from the user and the term “proximal” refers to the portion that is closest to the user. In addition, terms such as “above”, “below”, “forward”, “rearward”, etc. refer to the orientation of the figures or the direction of components and are simply used for convenience of description.
Referring now to
With reference now to
With reference to
With continued reference to
In the embodiment illustrated in
In an alternate embodiment, see
In one particular embodiment, one or more structure(s) or device(s) may be employed to concentrate the electrosurgical energy radiating from the radiating section 518 and/or conductive tip 524 to tissue at a target tissue site. More particularly, and with reference to
Shield 408 is configured to provide enhanced directionality of the radiating pattern of the electrosurgical energy transmitted to the radiating section 518 and/or conductive tip 524. In one particular embodiment, the shield 408 may include a generally hemispherical or clamshell configuration (
U.S. patent application Ser. Nos. 12/542,348 and 12/568,524 filed on Aug. 17, 2009 and Sep. 28, 2009, respectively.
In the embodiment illustrated in
As noted above, in some instances it may prove useful to utilize a microwave antenna (e.g., microwave antenna 100) that includes a deployable tip 114. In this instance, the deployable conductive tip 114 includes a configuration of loop 400 proportioned small enough in diameter to facilitate deployment of the conductive tip 114. During a surgical procedure, e.g., ablation procedure, a portion of the loop 400 may be positioned around a tumor or soft tissue.
In certain embodiments, a portion of the microwave antenna may be coated with a non-stick material 140 (see
In certain embodiments, a dielectric material 517 (see
Operation of system 10 is now described with respect to
From the foregoing and with reference to the various figure drawings, those skilled in the art will appreciate that certain modifications can also be made to the present disclosure without departing from the scope of the same. For example, one or more modules associated with the generator 200 and/or controller 300 may be configured to monitor the reactive elements or components, e.g., inductive element 402, associated with the loop 400 such that a specific electromagnetic field is generated by the reactive elements or components during the transmission of electrosurgical energy from the generator 200 to the microwave antenna 512. More particularly, one or more sensors (e.g., one or more voltage and current sensors) may be operably positioned at a predetermined location and adjacent the radiating section 518 and/or loop 400. More particularly, the sensor(s) may be operably disposed along a length of the loop 400 and in operative communication with the module(s) associated with the generator 200 and/or controller 300. The sensor(s) may react to voltage and/or current fluctuations associated with the loop 400 and caused by electromagnetic fields fluctuations generated by one or more of the reactive components, e.g., inductive element 402, associated with the loop 400. In this instance, the sensor(s) may be configured to trigger a control signal to the module(s) when an electromagnetic field of predetermined strength is generated. When the module(s) detects a control signal, the module may send a command signal to the generator 200 and/or controller 300 such that the electrosurgical power output to the microwave antenna 512 may be adjusted accordingly.
While several embodiments of the disclosure have been shown in the drawings and/or discussed herein, it is not intended that the disclosure be limited thereto, as it is intended that the disclosure be as broad in scope as the art will allow and that the specification be read likewise. Therefore, the above description should not be construed as limiting, but merely as exemplifications of particular embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the claims appended hereto.
Claims
1-20. (canceled)
21. A microwave ablation system, comprising: a reactively-loaded loop including at least two reactive components.
- a power source; and
- a microwave antenna configured to couple to the power source, the microwave antenna including: an inner conductor; an outer conductor; a dielectric disposed between at least a portion of the inner conductor and the outer conductor; and
22. The microwave ablation system according to claim 21, wherein the microwave antenna includes a radiating section and a shield operably coupled to the radiating section.
23. The microwave ablation system according to claim 22, wherein the shield is formed of a conductive material.
24. The microwave ablation system according to claim 22, wherein the shield is disposed about at least a portion of the reactively-loaded loop.
25. The microwave ablation system according to claim 22, wherein the inner conductor defines at least a portion of the radiating section.
26. The microwave ablation system according to claim 21, wherein the inner conductor extends distally of the outer conductor and defines one of the at least two reactive components.
27. The microwave ablation system according to claim 21, further comprising a dielectric shielding, wherein the inner conductor defines a loop disposed adjacent the dielectric shielding.
28. The microwave ablation system according to claim 21, wherein at least one of the at least two reactive components is selected from the group consisting of an inductor, a capacitor, and combinations thereof.
29. The microwave ablation system according to claim 21, wherein the reactively-loaded loop includes a combination of at least one inductor and at least one capacitor.
30. The microwave ablation system according to claim 29, wherein the at least one inductor and the at least one capacitor are coupled to the inner conductor in series with respect to each other.
31. The microwave ablation system according to claim 21, wherein the inner conductor includes a spiral configuration capacitively coupling the inner conductor to the dielectric.
32. The microwave ablation system according to claim 21, wherein the microwave antenna includes a radiating section and a dielectric material surrounding the radiating section and the at least two reactive components, the dielectric material providing an impedance match between the microwave antenna and tissue.
33. A microwave antenna comprising:
- an inner conductor;
- an outer conductor;
- a dielectric disposed between at least a portion of the inner conductor and the outer conductor; and
- a reactively-loaded loop including at least two reactive components.
34. The microwave antenna according to claim 33, wherein the microwave antenna includes a radiating section and a shield operably coupled to the radiating section.
35. The microwave antenna according to claim 34, wherein the shield is formed of a conductive material.
36. The microwave antenna according to claim 34, wherein the shield is disposed about at least a portion of the reactively-loaded loop.
37. The microwave antenna according to claim 33, wherein the inner conductor extends distally of the outer conductor and defines one of the at least two reactive components.
38. The microwave antenna according to claim 33, further comprising a dielectric shielding, wherein the inner conductor defines a loop disposed adjacent the dielectric shielding.
39. The microwave antenna according to claim 33, wherein at least one of the at least two reactive components is selected from the group consisting of an inductor, a capacitor, and combinations thereof.
40. The microwave antenna according to claim 33, wherein the reactively-loaded loop includes a combination of at least one inductor and at least one capacitor.
Type: Application
Filed: Jun 27, 2016
Publication Date: Oct 20, 2016
Inventors: BRIAN SHIU (SUNNYVALE, CA), JOSEPH D. BRANNAN (LYONS, CO), MANI N. PRAKASH (BOULDER, CO)
Application Number: 15/194,343