# Patent

## Title
Systems, apparatus, methods and procedures for the noninvasive treatment of tissue using microwave energy

## Abstract

The present invention is directed to systems, apparatus, methods and procedures for the noninvasive treatment of tissue, including treatment using microwave energy. In one embodiment of the invention a medical device and associated apparatus and procedures are used to treat dermatological conditions using, for example, microwave energy.

## Background
RELATED APPLICATIONS
This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61/208,315, filed Feb. 23, 2009, and entitled “Systems, Apparatus, Methods And Procedures For The Noninvasive Treatment Of Tissue Using Microwave Energy,” which is expressly incorporated herein by reference in its entirety.
This application also claims the benefit of PCT Application Serial No. PCT/US2008/013650, filed Dec. 12, 2008, and entitled “Systems, Apparatus, Methods And Procedures For The Noninvasive Treatment Of Tissue Using Microwave Energy,” which is expressly incorporated herein by reference in its entirety.
This application also claims the benefit of U.S. Provisional Patent Application Ser. No. 61/196,948, filed Oct. 22, 2008, and entitled “Systems And Methods For Creating An Effect Using Microwave Energy To Specified Tissue, Such As Sweat Glands,” which is expressly incorporated herein by reference in its entirety.
This application also is a continuation-in-part of co-pending U.S. patent application Ser. No. 12/107,025, filed Apr. 21, 2008, and entitled “Systems And Methods For Creating An Effect Using Microwave Energy To Specified Tissue,” which claims the benefit of each of U.S. Provisional Patent Application Ser. No. 60/912,899, filed Apr. 19, 2007, and entitled “Methods And Apparatus For Reducing Sweat Production;” and U.S. Provisional Patent Application Ser. No. 61/013,274, filed Dec. 12, 2007, and entitled “Methods, Devices And Systems For Non-Invasive Delivery Of Microwave Therapy;” and U.S. Provisional Patent Application Ser. No. 61/045,937, filed Apr. 17, 2008, and entitled “Systems And Methods For Creating An Effect Using Microwave Energy In Specified Tissue.” All of the above priority applications are expressly incorporated by reference in their entirety.
Co-pending U.S. patent application Ser. No. 12/107,025 also claims priority to each of PCT Application Serial. No. PCT/US08/60935, filed Apr. 18, 2008, and entitled “Methods And Apparatus For Sweat Production”; and PCT Application Serial No. PCT/US08/60929, filed Apr. 18, 2008, and entitled “Methods, Devices, And Systems For Non-Invasive Delivery Of Microwave Therapy”; and PCT Application Serial No. PCT/US08/60940, filed Apr. 18, 2008, and entitled “Systems And Methods For Creating An Effect Using Microwave Energy To Specified Tissue”; and PCT Application Serial No. PCT/US08/60922, filed Apr. 18, 2008, and entitled “Systems And Methods For Creating An Effect Using Microwave Energy To Specified Tissue.” All of the above priority applications are expressly incorporated by reference in their entirety.


FIELD OF THE INVENTION
The present application relates to methods, apparatuses and systems for non-invasive delivery of energy, including microwave therapy. In particular, the present application relates to methods, apparatuses and systems for non-invasively delivering energy, such as, for example, microwave energy, to the epidermal, dermal and sub-dermal tissue of a patient to achieve various therapeutic and/or aesthetic results.
DESCRIPTION OF THE RELATED ART
It is known that energy-based therapies can be applied to tissue throughout the body to achieve numerous therapeutic and/or aesthetic results. There remains a continual need to improve on the effectiveness of these energy-based therapies and provide enhanced therapeutic results with minimal adverse side effects or discomfort.



BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be understood from the following detailed description of preferred embodiments, taken in conjunction with the accompanying drawings, wherein:
FIG. 1 is an illustration of a system including a generator, applicator and disposable according to an embodiment of the invention.
FIG. 2 is a perspective view of a medical treatment device, including an applicator and disposable, according to an embodiment of the invention.
FIG. 3 is an end on view of the distal end of a medical treatment device, including an applicator and the disposable according to an embodiment of the invention.
FIG. 4 is an exploded perspective view of a medical treatment device according to an embodiment of the invention.
FIG. 5 is a view of a medical treatment device according to an embodiment of the invention including a cutaway view of applicator according to an embodiment of the invention.
FIG. 6 is a perspective view of a disposable according to an embodiment of the invention.
FIG. 7 is a view of a proximal side of a disposable according to an embodiment of the invention.
FIG. 8 is a side view of one end of a disposable according to an embodiment of the invention.
FIG. 9 is a side view of one end of a disposable according to an embodiment of the invention.
FIG. 10 is a view of a distal side of a disposable according to an embodiment of the invention.
FIG. 11 is a side view of a disposable according to an embodiment of the invention.
FIG. 12 is a cutaway side view of a disposable according to an embodiment of the invention.
FIG. 13 is a cutaway side view of a disposable according to an embodiment of the invention.
FIG. 14 is a cutaway perspective view of a disposable according to an embodiment of the invention.
FIG. 15 is a top perspective view of a proximal end of a disposable according to an embodiment of the invention.
FIG. 16 is a perspective view of an antenna array according to an embodiment of the invention.
FIG. 17 is an end view of a portion of an antenna array according to an embodiment of the invention.
FIG. 18 is a cutaway side view of a portion antenna array according to an embodiment of the invention.
FIG. 19 is a cutaway side view of a portion antenna array according to an embodiment of the invention.
FIG. 20 is a simplified cutaway view of a medical treatment device with tissue engaged according to an embodiment of the invention.
FIG. 21 is a simplified cutaway view of a medical treatment device with tissue engaged according to an embodiment of the invention.
FIG. 22 is a simplified cutaway view of a medical treatment device with tissue engaged according to an embodiment of the invention.
FIG. 23 is a graphical illustration of a pattern of lesions in tissue according to an embodiment of the invention.
FIG. 24 illustrates a treatment template according to an embodiment of the invention.



DESCRIPTION OF THE PREFERRED EMBODIMENT
Although the disclosure hereof is detailed and exact to enable those skilled in the art to practice the invention the physical embodiments herein disclosed merely exemplify the invention which may be embodied in other specific structures. While the preferred embodiment has been described, the details may be changed without departing from the invention which is defined by the claims.
FIG. 1 is an illustration of a system 2309 including a generator 2301, applicator 2320 (which may also be referred to as re-usable) and disposable 2363 according to an embodiment of the invention. According to an embodiment of the invention applicator 2320 and disposable 2363 may comprise a medical treatment device 2300. According to an embodiment of the invention generator 2301 may operate in the ISM band of 5.775 to 5.825 GHz. According to an embodiment of the invention generator 2301 may have a Frequency centered at approximately 5.8 GHz. According to an embodiment of the invention generator 2301 includes circuitry for setting and controlling output power; measuring forward and reverse power and setting alarms. According to an embodiment of the invention generator 2301 may have a power output of between approximately 40 Watts and approximately 100 Watts. According to an embodiment of the invention generator 2301 may have a power output of between approximately 40 Watts and approximately 100 Watts where said output is measured into a 50 ohm load. According to an embodiment of the invention generator 2301 may have a power output of approximately 55 Watts measured into a 50 ohm load. According to an embodiment of the invention disposable 2363 and applicator 2320 may be formed into two separable units. According to an embodiment of the invention disposable 2363 and applicator 2320 may be formed into a single unit. According to an embodiment of the invention when combined disposable 2363 and applicator 2320 may form a medical treatment device 2300. According to an embodiment of the invention generator 2301 may be a microwave generator. According to an embodiment of the invention in system 2309 applicator 2320 may be connected to generator 2301 by applicator cable 2334. According to an embodiment of the invention in system 2309 applicator cable 2334 may include coolant conduit 2324, energy cable 2322, coolant thermocouple wires 2331, cooling plate thermocouple wires 2330 and antenna switch signal 2481. According to an embodiment of the invention in system 2309 coolant conduit 2324 may be connected to a coolant source 2310 (which may be, for example, a Nanotherm industrial recirculation chiller with 8 pounds per square inch pump output pressure available from ThermoTek, Inc). According to an embodiment of the invention in system 2309 energy cable 2322 may be connected to generator 2301 by microwave output connector 2443. According to an embodiment of the invention in system 2309 antenna switch signal 2481 may be connected to generator 2301 by antenna switch connector 2480. According to an embodiment of the invention in system 2309 disposable 2363 may be connected to generator 2301 by vacuum tubing 2319 which may include generator bio-barrier 2317, which may be, for example, a hydrophobic filter. According to an embodiment of the invention in system 2309 vacuum tubing 2319 may be connected to generator 2301 by vacuum port connector 2484. According to an embodiment of the invention in system 2309 front panel 2305 of generator 2301 may include power control knob 2454, vacuum control knob 2456, antenna select switch 2462 (which may include both display elements and selection switches), vacuum meter 2486, antenna temperature display 2458, coolant temperature display 2460, pre-cool timer 2468 (which may include both display elements and time set elements), energy timer 2470 (which may include both display elements and time set elements), post-cool timer 2472 (which may include both display elements and time set elements), start button 2464, stop button 2466, ready indicator 2476 and fault indicator 2474. According to an embodiment of the invention an error signal is sent to generator 2301 if a measured signal is outside of the specification for the requested power set by the power control knob 2454 on front panel 2305. According to an embodiment of the invention vacuum tube 2319 may include a flexible vacuum hose 2329 and a generator bio-barrier 2317. According to an embodiment of the invention flexible vacuum hose 2329 is adapted to collect fluids, such as, for example sweat or blood, which may escape disposable 2363 so that such fluids do not reach generator 2301. According to an embodiment of the invention generator bio-barrier 2317 may include a hydrophobic filter to keep fluids out of vacuum port connector 2484 of generator 2301. According to an embodiment of the invention generator bio-barrier 2317 may include a hydrophobic filter, such as, for example, a Millex FH Filter made of 0.45 micrometer hydrophobic PTFE which is available from Milipore. According to an embodiment of the invention generator bio-barrier 2317 may be positioned in vacuum tube 2319 between flexible vacuum hose 2329 and vacuum port connector 2484. According to an embodiment of the invention applicator cable 2334 may connect generator 2301 to applicator 2320. According to an embodiment of the invention cooling plate thermocouple wires 2330 and coolant thermocouple wires 2331 may be connected to generator 2301 by temperature connector 2482. According to an embodiment of the invention coolant conduit 2324 may convey cooling fluid from a coolant source 2310 to applicator 2320. According to an embodiment of the invention applicator cable 2334 may convey microwave switch selection data to applicator 2320 and temperature data from thermocouples in applicator 2320 to generator 2301. According to an embodiment of the invention applicator cable 2334 may comprise one or more separate cables and connectors. According to an embodiment of the invention a generator connector may be designed and adapted to connect applicator cable 2334 to generator 2301, including connections for cooling conduit 2324, antenna switch signal 2481, energy cable 2322, cooling plate thermocouple wires 2330 and coolant thermocouple wires 2331.
FIG. 2 is a perspective view of a medical treatment device 2300 including an applicator 2320 and disposable 2363 according to an embodiment of the invention. According to an embodiment of the invention applicator 2320 may be attached to disposable 2363 by latching mechanism 2365. According to an embodiment of the invention applicator 2320 may include applicator cable 2334. According to an embodiment of the invention disposable 2363 may include vacuum tubing 2319, tissue chamber 2338 and tissue interface surface 2336.
FIG. 3 is an end on view of a distal end of a medical treatment device 2300 including an applicator 2320 and disposable 2363 according to an embodiment of the invention. According to an embodiment of the invention disposable 2363 may include tissue bio-barrier 2337. According to an embodiment of the invention applicator 2320 may include cooling plate 2340, which may be, for example, positioned behind tissue bio-barrier 2337. According to an embodiment of the invention tissue bio-barrier 2337 may form a portion of tissue interface surface 2336. According to an embodiment of the invention latching mechanism 2365 may be used to facilitate the connection of disposable 2363 to applicator 2320.
FIG. 4 is a perspective view of a medical treatment device 2300 including an exploded perspective view of an applicator 2320 and a view of disposable 2363 according to the present invention. According to an embodiment of the invention applicator 2320 may include a cooling plate 2340, separation ribs 2393, intermediate scattering elements 3393, antenna cradle 2374, waveguide assembly 2358 and antenna switch 2357. According to an embodiment of the invention waveguide assembly 2358 may include antennas 2364(a-d). According to an embodiment of the invention disposable 2363 may include vacuum tubing 2319, latching elements 2359 and vacuum seal 2348.
FIG. 5 is a view of a medical treatment device 2300 according to an embodiment of the present invention including a cutaway view of applicator 2320 and disposable 2363. According to an embodiment of the invention applicator 2320 may include antenna array 2355, antenna switch 2357 and applicator cable 2334. According to an embodiment of the invention applicator cable 2334 may include cooling plate thermocouple wires 2330, coolant thermocouple wires 2331, coolant supply tubing 2312, coolant return tubing 2313, antenna switch signal 2481, energy cable 2322. According to an embodiment of the invention cooling plate thermocouple wires 2330 may include one or more thermocouple wires which may be attached to an or more thermocouples positioned opposite an output of antenna array 2355. According to an embodiment of the invention coolant thermocouple wires 2331 may include one or more thermocouple wires attached to an or more cooling path thermocouples 2326 which may be positioned to measure coolant fluid, such as, for example, in coolant return tubing 2313. According to an embodiment of the invention one or more cooling path thermocouples 2326 may be positioned to measure the temperature of cooling fluid 2361 after it passes through coolant chamber 2360. According to an embodiment of the invention one or more cooling path thermocouples 2326 may be located in coolant return tubing 2313. According to an embodiment of the invention cooling path thermocouples 2326 may function to provide feedback to generator 2301 indicative of the temperature of cooling fluid 2361 after cooling fluid 2361 passes through coolant chamber 2360. According to an embodiment of the invention disposable 2363 may include latching element 2359. According to an embodiment of the invention applicator cable 2334 may include interconnect cables 2372 to transmit signals to antenna array 2355. According to an embodiment of the invention antenna array 2355 may include antenna cradle 2374.
FIG. 6 is a perspective view of disposable 2363 according to an embodiment of the invention. FIG. 7 is a view of the proximal side of disposable 2363 according to an embodiment of the invention. FIG. 8 is a side view of one end of disposable 2363 according to an embodiment of the invention. FIG. 9 is a side view of one end of disposable 2363 according to an embodiment of the invention. FIG. 10 is a view of the distal side of disposable 2363 according to an embodiment of the invention. FIG. 11 is a side view of disposable 2363 according to an embodiment of the invention. FIG. 12 is a cutaway side view of disposable 2363 according to an embodiment of the invention. FIG. 13 is a cutaway side view of disposable 2363 according to an embodiment of the invention. FIG. 14 is a cutaway perspective view of disposable 2363 according to an embodiment of the invention. FIG. 15 is a top perspective view of a proximal end of disposable 2363 according to an embodiment of the invention.
According to an embodiment of the invention disposable 2363 may include tissue interface surface 2336, tissue chamber 2338 and alignment features 3352. According to an embodiment of the invention tissue interface surface 2336 may form a back wall of tissue chamber 2338. According to an embodiment of the invention tissue interface surface 2336 may include tissue bio-barrier 2337 and vacuum passage 3333. According to an embodiment of the invention vacuum passage 3333 may also be referred to as a lip or rim. According to an embodiment of the invention disposable 2363 may include alignment features 3352 and vacuum tubing 2319. According to an embodiment of the invention disposable 2363 may include compliant member 2375. According to an embodiment of the invention chamber walls 2354 may include a compliant member 2375. According to an embodiment of the invention compliant member 2375 may be formed from a compliant material, such as, for example, rubber, coated urethane foam (with a compliant plastic or rubber seal coating), silicone, polyurethane or heat sealed open cell foam. According to an embodiment of the invention compliant member 2375 may be positioned around the outer edge of tissue chamber 2338 to facilitate the acquisition of tissue. According to an embodiment of the invention compliant member 2375 may be positioned around the outer edge of chamber opening 2339 to facilitate the acquisition of tissue. According to an embodiment of the invention compliant member 2375 may facilitate the engagement of tissue which is not flat, such as, for example tissue in the axilla. According to an embodiment of the invention compliant member 2375 may facilitate the engagement of tissue which is not flat, such as, for example tissue in the outer regions of the axilla. According to an embodiment of the invention compliant member 2375 may provide improved sealing characteristics between the skin and tissue chamber 2338, particularly where the skin is not flat. According to an embodiment of the invention compliant member 2375 may speed the acquisition of tissue in tissue chamber 2338, particularly where the skin is not flat. According to an embodiment of the invention compliant member 2375 may have a height of between approximately 0.15 inches and approximately 0.40 inches above chamber opening 2339 when compliant member 2375 is not compressed. According to an embodiment of the invention compliant member 2375 may have a height of approximately 0.25 inches above chamber opening 2339 when compliant member 2375 is not compressed. According to an embodiment of the invention alignment features 3352 may be positioned at a distance which facilitate appropriate placement of applicator 2320 during treatment. According to an embodiment of the invention alignment features 3352 may be positioned approximately 30.7 millimeters apart. According to an embodiment of the invention alignment features 3352 may be further positioned and may be designed to assist a physician in positioning applicator 2320 prior to the application of energy. According to an embodiment of the invention alignment features 3352 on disposable 2363 assist the user in properly positioning the applicator prior to treatment and in moving the applicator to the next treatment region during a procedure. According to an embodiment of the invention alignment features 3352 on disposable 2363, when used with marks or landmarks in a treatment region facilitate the creation of a continuous lesion. According to an embodiment of the invention alignment features 3352 may be used to align medical treatment device 2300 before suction is applied. According to an embodiment of the invention an outer edge of compliant member 2375 may assist a user in aligning medical treatment device 2300.
According to an embodiment of the invention compliant member 2375, which may also be referred to as a skirt or flexible skirt, may be manufactured from silicone. According to an embodiment of the invention compliant member 2375 may extend approximately 0.25′′ from rigid surface 3500. According to an embodiment of the invention a counter sink or dovetail notch 2356 may be positioned in rigid disposable surface 3500 around the outer edge of chamber opening 2339 to assist in alignment of compliant member 2375. According to an embodiment of the invention the compliant member 2375 may have a durometer density rating (softness) of approximately A60 which may help compliant member 2375 to maintain its shape better while being easier to mold. According to an embodiment of the invention colorant may be used in compliant member 2375 to contrast with skin viewed through compliant member 2375, making it easier for user, such as a physician to distinguish between skin and a distal surface of compliant member 2375. According to an embodiment of the invention colorant may be used in compliant member 2375 to make it easier for user, such as a physician to distinguish between skin and an outer edge of compliant member 2375. According to an embodiment of the invention colorant may be used in compliant member 2375 to help a user distinguish an edge of compliant member 2375 from surrounding skin and assist in aligning of medical treatment device 2300. According to an embodiment of the invention the angle of compliant member 2375 relative to rigid surface 3500 may be approximately 53 degrees when compliant member 2375 is not compressed.
According to an embodiment of the invention disposable 2363 includes applicator chamber 2346. According to an embodiment of the invention disposable 2363 may include an applicator chamber 2346 which may be formed, at least in part, by tissue bio-barrier 2337. According to an embodiment of the invention disposable 2363 may include applicator bio-barrier 2332 (which may be, for example, a polyethylene film, available from Fisher Scientific), and vacuum passage 3333. According to an embodiment of the invention a counter bore may positioned between applicator bio-barrier 2332 and applicator chamber 2346.
According to an embodiment of the invention vacuum passage 3333 connects vacuum channel 3350 to tissue chamber 2338. According to an embodiment of the invention vacuum channel 3350 may also be referred to as a reservoir or vacuum reservoir. According to an embodiment of the invention vacuum connector 2328 is connected to vacuum passage 3333 through vacuum channel 3350. According to an embodiment of the invention vacuum channel 3350 may connect vacuum passages 3333 connect vacuum connector 2328 in tissue chamber 2338. According to an embodiment of the invention vacuum passages 3333 form a direct path to tissue interface surface 2336. According to an embodiment of the invention vacuum passages 3333 and vacuum channel 3350 may be adapted to restrict the movement of fluids from tissue chamber 2338 to applicator bio-barrier 2332. According to an embodiment of the invention vacuum connector 2328 may be positioned on the same side of disposable 2363 as applicator bio-barrier 2332. According to an embodiment of the invention applicator bio-barrier 2332 may be designed to prevent fluids from tissue chamber 2338 from reaching applicator chamber 2346, particularly when there is back pressure caused by, for example, a vacuum created in tissue chamber 2338 as tissue is pulled away from tissue interface surface 2336. According to an embodiment of the invention vacuum pressure may be used to support tissue acquisition in tissue chamber 2338. According to an embodiment of the invention vacuum pressure may be used to pull tissue into tissue chamber 2338. According to an embodiment of the invention vacuum pressure may be used to maintain tissue in tissue chamber 2338. According to an embodiment of the invention vacuum channel 2350 may surround tissue interface surface 2336. According to an embodiment of the invention applicator bio-barrier 2332 may be positioned between vacuum passages 3333 and applicator chamber 2346. According to an embodiment of the invention applicator bio-barrier 2332 may be a membrane which may be adapted to be permeable to air but substantially impermeable to biological fluids such as, for example, blood and sweat. According to an embodiment of the invention applicator bio-barrier 2332 may be a hydrophobic membrane filter. According to an embodiment of the invention applicator bio-barrier 2332 may be made of polyethylene film, nylon or other suitable materials. According to an embodiment of the invention applicator bio-barrier 2332 may include pores having sizes sufficient to pass enough air to substantially equalize the vacuum pressure in applicator chamber 2346 and in tissue chamber 2338 without passing biological fluids from tissue chamber 2338 to applicator chamber 2346. According to an embodiment of the invention applicator bio-barrier 2332 may include pores having sizes of approximately 0.45 micrometers. According to an embodiment of the invention when the vacuum is turned on, and before pressure is equalized, applicator bio-barrier 2332 may induce a minimal pressure drop between vacuum passages 3333 and the applicator chamber 2346. According to an embodiment of the invention applicator chamber 2346 and tissue chamber 2338 may be separated, at least in part, by tissue bio-barrier 2337. According to an embodiment of the invention tissue chamber 2338 may include tissue interface surface 2336 and chamber wall 2354.
According to an embodiment of the invention tissue chamber opening 2339 has dimensions which facilitate the acquisition of tissue. According to an embodiment of the invention tissue chamber 2339 may be sized to facilitate tissue acquisition while being large enough to prevent interference with energy radiated from waveguide antennas 2364 in antenna array 2355 when applicator 2320 is attached to disposable 2363. According to an embodiment of the invention a vacuum circuit 3341 may include vacuum passages 3333, vacuum channel 3350 and may encircle tissue chamber 3338. According to an embodiment of the invention vacuum channel 3350 may be positioned around tissue chamber 2338. According to an embodiment of the invention vacuum passage 3333 may be positioned around a proximal end of tissue chamber 2338. According to an embodiment of the invention vacuum passage 3333 may be positioned around a proximal end of tissue chamber 2338 between tissue bio-barrier 2337 and a proximal end of chamber wall 2354. According to an embodiment of the invention an opening to vacuum passage 3333 may be approximately 0.020 inches in height. According to an embodiment of the invention an opening to vacuum passage 3333 may be approximately 0.010 inches in height when disposable 2363 is attached to applicator 2320 and tissue bio-barrier 2337 is stretched into tissue chamber 2338 by a distal end of applicator 2320. According to an embodiment of the invention vacuum passage 3333 may have an opening height which is too small for tissue to invade when a vacuum is applied.
According to an embodiment of the invention disposable 2363 may be manufactured from a clear or substantially clear material to assist a user, such as a physician in viewing tissue engagement. According to an embodiment of the invention the disposable 2363 may have an outer angle to allow a user to see alignment features 3352 on compliant member 2375 to assist a user in aligning medical treatment device 2300. According to an embodiment of the invention an angle around the outside of disposable 2363 provides a user with a direct view of alignment features 3352. According to an embodiment of the invention tissue chamber 2338 may have dimensions of approximately 1.54 inches by approximately 0.7 inches. According to an embodiment of the invention the 4 corners of tissue chamber 2338 may have a radius of 0.1875 inches. According to an embodiment of the invention antenna array 2335 may include four antennas and may have dimensions of approximately 1.34 inches by approximately 0.628 inches. According to an embodiment of the invention the dimensions of the waveguide array 2335 and tissue chamber 2338 may be optimized to minimizing stray fields forming at the edges of waveguide array 2335 as well as optimizing the effective cooling area of tissue interface surface 2336. According to an embodiment of the invention tissue chamber 2338 may be optimized to facilitate tissue acquisition without adversely impacting cooling or energy transmission.
FIG. 16 is a perspective view of antenna array 2355 according to an embodiment of the invention. According to an embodiment of the invention antenna array 2355 may include antenna cradle 2374. According to an embodiment of the invention antenna cradle 2374 may include reservoir inlet 2384 and antenna chamber 2377. According to an embodiment of the invention waveguide assembly 2358 may include one or more spacer 3391 (which may be, for example, copper shims) positioned between waveguide antennas 2364. According to an embodiment of the invention spacer 3391 may be positioned between waveguide antenna 2364a and waveguide antenna 2364b. According to an embodiment of the invention spacer 3391 may be positioned between waveguide antenna 2364b and waveguide antenna 2364c. According to an embodiment of the invention spacer 3391 may be positioned between waveguide antenna 2364c and waveguide antenna 2364d. According to an embodiment of the invention microwave energy may be supplied to each waveguide antenna through feed connectors 2388. According to an embodiment of the invention waveguide assembly 2358 may be held together by a waveguide assembly frame 2353. According to an embodiment of the invention waveguide assembly frame 2353 may include feed brackets 2351 and assembly bolts 2349. According to an embodiment of the invention antenna array 2355 may include antenna cradle 2374 and least one waveguide antenna 2364. According to an embodiment of the invention antenna array 2355 may include one or more spacer 3391. According to an embodiment of the invention antenna array 2355 may include four waveguide antennas 2364a, 2364b, 2364c and 2364d. According to an embodiment of the invention the heights of waveguide antennas 2364 in antenna array 2355 may be staggered to facilitate access to feed connectors 2388. According to an embodiment of the invention one or more waveguide antenna 2364 in antenna array 2355 may include tuning element 2390.
FIG. 17 is an end view of a portion of antenna array 2355 according to an embodiment of the invention. FIG. 18 is a cutaway side view of a portion antenna array 2355 according to an embodiment of the invention. FIG. 19 is a cutaway side view of a portion antenna array 2355 according to an embodiment of the invention. According to an embodiment of the invention antenna array 2355 includes coolant chambers 2360 (for example coolant chambers 2360a, 2360b, 2360c and 2360d), intermediate scattering elements 3393, separation ribs 2393 and scattering elements 2378 (for example scattering elements 2378a, 2378b, 2378c and 2378d). According to an embodiment of the invention scattering elements 2378 may also be referred to as central scattering elements. According to an embodiment of the invention coolant chambers 2360a-2360d may be located beneath waveguide antenna 2364a-2364d. According to an embodiment of the invention coolant chambers 2360 may include separation ribs 2393 on either side of antenna array 2355 and intermediate scattering elements 3393 between antennas 2364. According to an embodiment of the invention an intermediate scattering element 3393 may be positioned between waveguide antenna 2364a and waveguide antenna 2364b. According to an embodiment of the invention an intermediate scattering element 3393 may be positioned between waveguide antenna 2364b and waveguide antenna 2364c. According to an embodiment of the invention an intermediate scattering element 3393 may be positioned between waveguide antenna 2364c and waveguide antenna 2364d. According to an embodiment of the invention cooling fluid flowing through coolant chambers 2360 may have a flow rate of between approximately 200 milliliters per minute and approximately 450 milliliters per minute and preferably approximately 430 milliliters per minute. According to an embodiment of the invention coolant chambers 2360 may be designed to ensure that the flow rate through each coolant chamber 2360 is substantially the same. According to an embodiment of the invention coolant the flow rate of cooling fluid through coolant chamber 2360a is the same as the flow rate of cooling fluid through coolant chamber 2360b. According to an embodiment of the invention coolant the flow rate of cooling fluid through coolant chamber 2360a is the same as the flow rate of cooling fluid through coolant chambers 2360b, 2360c and 2360d. According to an embodiment of the invention cooling fluid flowing through coolant chamber 2360 may have a temperature of between approximately 8 degrees centigrade and approximately 22 degrees centigrade and preferably approximately 15 degrees centigrade. According to an embodiment of the invention coolant chambers 2360 may be positioned between an aperture of waveguide antenna 2364 cooling plate 2340. According to an embodiment of the invention scattering elements 2378 may extend into at least a portion of coolant chambers 2360. According to an embodiment of the invention scattering elements 2378 may extend through coolant chambers 2360. According to an embodiment of the invention scattering elements 2378 and intermediate scattering elements 3393 may extend through coolant chambers 2360 to contact a proximal surface of cooling plate 2340. According to an embodiment of the invention elements of coolant chamber 2360 may be smoothed or rounded to promote laminar fluid flow through coolant chambers 2360. According to an embodiment of the invention elements of coolant chambers 2360 may be smoothed to reduce the generation of air bubbles in coolant chamber 2360. According to an embodiment of the invention scattering elements 2378 which extend into coolant chambers 2360 may be rounded to promote laminar flow and prevent the buildup of bubbles in coolant chamber 2360. According to an embodiment of the invention scattering elements 2378 may be formed in the shape of ovals or racetracks. According to an embodiment of the invention square edges or sharp corners in coolant chamber 2360 may result in undesirable flow characteristics, including the generation of air bubbles, as cooling fluid moves through coolant chamber 2360. According to an embodiment of the invention intermediate scattering elements 3393 may be positioned between separate individual coolant chambers 2360. According to an embodiment of the invention intermediate scattering elements 3393 may be positioned such that they facilitate equalized cooling across cooling plate 2340. According to an embodiment of the invention intermediate scattering elements 3393 may be sized such that they have a width which is equal to or less than the separation distance between apertures of waveguide antennas 2364. According to an embodiment of the invention intermediate scattering elements 3393 may be sized and positioned such that they are not positioned an aperture of waveguide antenna 2364. According to an embodiment of the invention intermediate scattering elements 3393 may be sized and positioned such that they modify a microwave field as it travels through coolant chamber 2360. According to an embodiment of the invention intermediate scattering elements 3393 may be sized and positioned such that they modify a microwave field radiated from waveguide antenna 2364. According to an embodiment of the invention intermediate scattering elements 3393 may be sized and positioned such that they spread out a microwave field as it travels through coolant chamber 2360. According to an embodiment of the invention intermediate scattering elements 3393 may cause disruption or perturbation of microwave energy radiated from waveguide antenna 2364. According to an embodiment of the invention intermediate scattering elements 3393 may be made of materials which will not rust or degrade in cooling fluid. According to an embodiment of the invention intermediate scattering elements 3393 may be made of materials which improve the SAR pattern in tissue. According to an embodiment of the invention intermediate scattering elements 3393 may be made of materials, such as dielectric materials, which are used to form scattering elements 2378. According to an embodiment of the invention FIGS. 17 through 19 may also include waveguide assembly 2358, feed connectors 2388, antenna chamber 2377, spacers 3391, cradle channels 2389 and antenna cradle 2374.
According to an embodiment of the invention intermediate scattering elements 3393 may be positioned between waveguide antennas 2364. According to an embodiment of the invention the size and shape of the intermediate scattering elements 3393 may be designed to optimize the size and shape of lesions developed in the skin between waveguide antennas 2364. According to an embodiment of the invention intermediate scattering elements 3393 may make lesions created in tissue between waveguide antennas 2364 larger and more spread out. According to an embodiment of the invention intermediate scattering elements 3393 may make lesions created in tissue between waveguide antennas 2364 narrower. According to an embodiment of the invention intermediate scattering elements 3393 may have an optimal length which is shorter than the length of scattering elements 2378. According to an embodiment of the invention scattering elements 2378 may be approximately 7 millimeters in length. According to an embodiment of the invention intermediate scattering elements 3393 may have an optimal length which is approximately 6.8 millimeters. According to an embodiment of the invention intermediate scattering elements 3393 may be manufactured from, for example, alumina. According to an embodiment of the invention intermediate scattering elements 3393 may be manufactured from, for example, a material which is approximately 96% alumina. According to an embodiment of the invention intermediate scattering elements 3393 may be manufactured from, for example, silicone. According to an embodiment of the invention the intermediate scattering elements 3393 may be manufactured from a material having the same dielectric constant as scattering elements 2378. According to an embodiment of the invention the intermediate scattering elements 3393 may be manufactured from a material having approximately the same dielectric constant as scattering elements 2378. According to an embodiment of the invention intermediate scattering elements 3393 may be manufactured from a material having a dielectric constant of approximately 10. According to an embodiment of the invention intermediate scattering elements 3393 may be manufactured from a material having a dielectric constant of approximately 3. According to an embodiment of the invention increasing the dielectric constant of intermediate scattering element 3393 may reduce the size of a lesion created in skin between waveguide antennas 2364. According to an embodiment of the invention intermediate scattering elements 3393 may be inserted into tung and grove slots between wave antennas 2364. According to an embodiment of the invention thermocouples may be positioned beneath one or more of intermediate scattering elements 3393. According to an embodiment of the invention thermocouples may be positioned each of intermediate scattering elements 3393.
FIGS. 20, 21 and 22 are simplified cutaway views of a medical treatment device 2300 with tissue engaged according to an embodiment of the invention. According to an embodiment of the invention skin 1307 is engaged in treatment device 2300. According to an embodiment of the invention dermis 1305 and hypodermis 1303 are engaged in medical treatment device 2300. According to an embodiment of the invention skin surface 1306 is engaged in medical treatment device 2300 such that skin surface 1306 is in thermal contact with at least a portion of cooling plate 2340. According to an embodiment of the invention skin surface 1306 is engaged in medical treatment device 2300 such that skin surface 1306 is in contact with at least a portion of tissue interface 2336. According to an embodiment of the invention a vacuum pressure may be used to elevate dermis 1305 and hypodermis 1303, separating dermis 1305 and hypodermis 1303 from muscle 1301. According to an embodiment of the invention vacuum pressure may be used to elevate dermis 1305 and hypodermis 1303, separating dermis 1305 and hypodermis 1303 from muscle 1301 to, for example, protect muscle 1301 by limiting or eliminating the electromagnetic energy which reaches muscle 1301. According to an embodiment of the invention waveguide assembly 2358 may include one or more waveguide antennas 2364. According to an embodiment of the invention electromagnetic energy, such as, for example, microwave energy may be radiated into dermis 1305 by medical treatment device 2300. According to an embodiment of the invention medical treatment device 2300 may include coolant chamber 2360 and cooling plate 2340. According to an embodiment of the invention a peak which may be, for example, a peak SAR, peak power loss density or peak temperature, is generated in first tissue region 1309. According to an embodiment of the invention first tissue region 1309 may represent a lesion created by energy, such as, for example, microwave energy radiated from medical treatment device 2300. According to an embodiment of the invention first tissue region 1309 may represent a lesion created by microwave energy radiated from one or more of waveguide antennas 2364. According to an embodiment of the invention first tissue region 1309 may be initiated in skin 1307 between first waveguide antenna 2364 and a second waveguide antenna 2364. According to an embodiment of the invention first tissue region 1309 may be initiated in skin 1307 between first waveguide antenna 2364a and a second waveguide antenna 2364b. According to an embodiment of the invention first tissue region 1309 may be initiated in skin 1307 underlying intermediate scattering element 3393. According to an embodiment of the invention a reduced magnitude which may be, for example, a reduced SAR, reduced power loss density or reduced temperature, is generated in second tissue region 1311 with further reduced magnitudes in third tissue region 1313 and fourth tissue region 1315. As illustrated in FIGS. 20 through 22, dermis 1305 is separated from hypodermis 1303 by interface 1308. As illustrated in FIGS. 20 through 22 interface 1308 may be idealized as a substantially straight line for the purposes of simplified illustration however in actual tissue, interface 1308 may be a non-linear, non continuous, rough interface which may also include many tissue structures and groups of tissue structures which cross and interrupt tissue interface 1308. According to an embodiment of the invention electromagnetic radiation may be radiated at a frequency of, for example, between 5 and 6.5 GHz. According to an embodiment of the invention electromagnetic radiation may be radiated at a frequency of, for example, approximately 5.8 GHz. According to an embodiment of the invention scattering element 2378 may be located in coolant chamber 2360 and intermediate scattering elements 3393 may be located between coolant chambers 2360. According to an embodiment of the invention scattering element 2378 and intermediate scattering elements 3393 may be used to, for example, spread and flatten first tissue region 1309. According to an embodiment of the invention scattering element 2378 and intermediate scattering elements 3393 may be used to, for example, spread and flatten a region, such as first tissue region 1309, of peak SAR in tissue. According to an embodiment of the invention scattering element 2378 and intermediate scattering elements 3393 may be used to, for example, spread and flatten a region, such as first tissue region 1309, of peak power loss density in tissue. According to an embodiment of the invention scattering element 2378 and intermediate scattering elements 3393 may be used to, for example, spread and flatten a region, such as first tissue region 1309, of peak temperature in tissue. According to an embodiment of the invention scattering element 2378 and scattering elements 3393 may be used to, for example, spread and flatten lesions formed in first tissue region 1309. According to an embodiment of the invention the creation of lesions, such as for example, a lesion in tissue region 1309 may be used to treat the skin of patients. According to an embodiment of the invention the creation of lesions, such as for example, a lesion in tissue region 1309 may be used to damage or destroy structures, such as, for example, sweat glands in the skin of a patient.
FIG. 23 is a graphical illustration of a pattern of lesions in tissue according to an embodiment of the invention. According to an embodiment of the invention lesions may be created in a predetermined order, such as, for example A-B-C-D where: A represents a lesion initiated directly under waveguide antenna 2364a; B represents a lesion initiated directly under waveguide antenna 2364b; C represents a lesion initiated directly under waveguide antenna 2364c; D represents a lesion initiated directly under waveguide antenna 2364d. According to an embodiment of the invention lesions may be created in a predetermined order such as, for example, A-AB-B-BC-C-CD-D where: A represents a lesion initiated directly under waveguide antenna 2364a; AB represents a lesion initiated under the intersection between waveguide antenna 2364a and waveguide antenna 2364b; B represents a lesion initiated directly under waveguide antenna 2364b; BC represents a lesion initiated under the intersection between waveguide antenna 2364b and waveguide antenna 2364c; C represents a lesion initiated directly under waveguide antenna 2364c; CD represents a lesion initiated under the intersection between waveguide antenna 2364c and waveguide antenna 2364d; and D represents a lesion initiated directly under waveguide antenna 2364d. According to an embodiment of the invention a lesion AB may be created between waveguide antenna 2364a and waveguide antenna 2364b, by driving waveguide antenna 2364a and waveguide antenna 2364b simultaneously in phase and with a balanced output from each antenna. According to an embodiment of the invention a lesion BC may be created between waveguide antenna 2364b and waveguide antenna 2364c, by driving waveguide antenna 2364b and waveguide antenna 2364c simultaneously in phase and with a balanced output from each waveguide antenna. According to an embodiment of the invention a lesion CD may be created between waveguide antenna 2364c and waveguide antenna 2364d, by driving waveguide antenna 2364c and waveguide antenna 2364d simultaneously in phase and with a balanced output from each waveguide antenna.
FIG. 24 is a treatment template 2483 according to an embodiment of the invention. According to an embodiment of the invention treatment template 2483 may include axilla outline 2497, anesthesia injection sites 2485, landmark alignment marks 2497, device alignment points 2498 and device alignment lines 2499. According to an embodiment of the invention axilla outline 2497 may be matched to the hair bearing area of a patient to select an appropriate treatment template 2483. According to an embodiment of the invention anesthesia injection sites 2485 may be used to identify appropriate points in the axilla for the injection of anesthesia. According to an embodiment of the invention landmark alignment marks may be used to align treatment template 2483 to landmarks, such as, for example, tattoos or moles on the axilla. According to an embodiment of the invention device alignment points 2498 may be used in conjunction with alignment features 3352 to properly align medical treatment device 2300. According to an embodiment of the invention device alignment lines 2499 may be used in conjunction with an outer edge of compliant member 2375 to properly align medical treatment device 2300. According to an embodiment of the invention treatment template 2384 provides guidance and placement information for medical treatment device 2300 in matrix format.
According to an embodiment of the invention A medical device disposable may include: a tissue chamber may have a tissue opening at a distal end and a rigid surface surrounding the tissue opening; an applicator chamber; a flexible bio-barrier at a proximal end of the tissue chamber the flexible bio-barrier separating the tissue chamber and the applicator chamber, a portion of the flexible bio-barrier forming a tissue contacting surface; a compliant member surrounding the tissue opening, the compliant member may have a proximal opening adjacent the tissue opening and a distal opening, wherein the distal opening may be larger than the proximal opening.
According to an embodiment of the invention the medical device disposable compliant member may be positioned at an angle of approximately fifty-three degrees with respect to the rigid surface. According to an embodiment of the invention the compliant member may include a wall connecting the proximal opening and the distal opening and the wall may be angled approximately fifty-three degrees with respect to the rigid surface. According to an embodiment of the invention the compliant member may further include an outer rim positioned around the distal opening. According to an embodiment of the invention: the outer rim may extend a distance of approximately 0.033 inches from the distal opening; the compliant member may have a height of approximately 0.25 inches; the tissue opening may have a long axis and a short axis, the tissue opening long axis may be approximately 1.875 inches and the tissue opening short axis may be approximately 1.055 inches; the distal opening in the compliant member may have a long axis and a short axis, the distal opening long axis may be approximately 2.429 inches and the distal opening short axis may be approximately 1.609 inches; the tissue contact surface may have a long axis and a short axis, the long axis may be approximately 1.54 inches and the short axis may be approximately 0.700 inches. According to an embodiment of the invention the wall may be substantially straight. According to an embodiment of the invention the compliant member may include one or more alignment marks, at least one of the alignment marks may be positioned on a long side of the compliant member. According to an embodiment of the invention the alignment marks may be positioned on a wall of the skirt and may extend from approximately the rim toward the tissue opening. According to an embodiment of the invention the alignment marks may move with respect to an applicator positioned in the applicator chamber when the medical device disposable is pressed against tissue with sufficient pressure to compress the compliant member. According to an embodiment of the invention the wall may have a thickness of approximately 0.050 inches. According to an embodiment of the invention the tissue chamber may include a chamber wall extending from the tissue opening to approximately the tissue contact surface, the wall may also include a substantially smooth, radiused surface. According to an embodiment of the invention the radiused surface may have a radius of approximately three-sixteenths of an inch. According to an embodiment of the invention the compliant member may have durometer density rating of approximately A60.
According to an embodiment of the invention A medical device disposable may include: a tissue chamber including a tissue contact surface at a proximal end of the tissue chamber and a tissue opening at a distal end of the tissue chamber; an applicator chamber; a flexible bio-barrier at a proximal end of the tissue chamber the flexible bio-barrier separating the tissue chamber and the applicator chamber, the flexible bio-barrier forming at least a portion of the tissue contact surface; a vacuum port; a vacuum circuit connecting the tissue chamber, the applicator chamber and the vacuum port, the vacuum circuit including a vacuum passage.
According to an embodiment of the invention the vacuum circuit may include: a vacuum passage positioned around the tissue contact surface; a vacuum channel positioned around the vacuum passage, the vacuum channel positioned between the vacuum passage and the vacuum port; an applicator bio-barrier positioned between the vacuum port and the applicator chamber, the applicator bio-barrier being substantially permeable to air and substantially impermeable to fluids. According to an embodiment of the invention the vacuum passage may completely surround the tissue interface surface. According to an embodiment of the invention the vacuum passage may substantially surrounds the tissue interface surface. According to an embodiment of the invention the vacuum passage may be positioned in a wall of the tissue chamber adjacent the tissue contact surface. According to an embodiment of the invention vacuum port may be connected to a vacuum tube. According to an embodiment of the invention the vacuum tube may include a generator bio-barrier. According to an embodiment of the invention the generator bio-barrier may be substantially permeable to air and being substantially impermeable to fluids. According to an embodiment of the invention the vacuum channel may include a well region adapted to collect fluids from the tissue chamber. According to an embodiment of the invention a compliant member may surround the tissue opening, the compliant member may have a proximal opening adjacent the tissue opening and a distal opening, wherein the distal opening may be larger than the proximal opening. According to an embodiment of the invention the vacuum passage may be an opening between a wall of the tissue chamber and the tissue bio-barrier. According to an embodiment of the invention the vacuum passage may be approximately 0.020′′ inches wide. According to an embodiment of the invention the vacuum passage may be greater than approximately 0.010′′ inches when the medical device disposable may be attached to an applicator. According to an embodiment of the invention the tissue surface may have an area greater than an outer area of an antenna array in an applicator affixed to the medical device disposable. According to an embodiment of the invention the tissue surface may have an area greater than an aperture area of an antenna array in an applicator affixed to the medical device disposable.
According to an embodiment of the invention a method of creating a lesion in skin is described, the method including the steps of: positioning an apparatus including a plurality of antennas adjacent a skin surface; supplying energy to a first antenna at a first power level for a first time period; supplying energy to a second antenna at a second power level for a second time period; supplying energy simultaneously to both the first antenna and the second antenna for a third time period, wherein, during the third time period the energy may be supplied to the first antenna at a third power level and the energy may be supplied to the second antenna at a fourth power level. According to an embodiment of the invention the energy supplied to the first antenna may be in phase with the energy supplied to the second antenna. According to an embodiment of the invention the energy supplied to the first antenna may be phase shifted from the energy supplied to the second antenna. According to an embodiment of the invention the energy supplied to the first antenna may be phase shifted approximately one hundred eighty degrees from the energy supplied to the second antenna. According to an embodiment of the invention the energy supplied to the first antenna may be phase shifted between one and one hundred eighty degrees from the energy supplied to the second antenna. According to an embodiment of the invention the energy output from the first antenna may be substantially in phase with energy output from the second antenna. According to an embodiment of the invention the energy supplied to the first antenna may be phase shifted from the energy supplied to the second antenna, the phase shift being sufficient to cause energy output from the first antenna to be in phase with energy output from the second antenna. According to an embodiment of the invention the energy supplied to the first and second antennas may be microwave energy having a frequency of approximately 5.8 GHz. According to an embodiment of the invention the first and second antennas may be microwave antennas. According to an embodiment of the invention the first and second antennas may be waveguide antennas. According to an embodiment of the invention the first and the second power levels may be substantially equal. According to an embodiment of the invention the first power level may be greater than the second power level. According to an embodiment of the invention the power emitted by the first antenna may be substantially equal to power emitted by the second antenna.
According to an embodiment of the invention a medical device applicator may include: an antenna array including at least two antenna apertures; at least one intermediate scattering element positioned outside the apertures wherein the at least one intermediate scattering element may be further positioned between the apertures. According to an embodiment of the invention each of the apertures may be substantially rectangular in shape, the apertures including a long axis and a short axis. According to an embodiment of the invention each of the intermediate scattering elements may include a long axis and a short axis wherein the long axis of the at least one intermediate scattering element may be substantially parallel to the long axis of the aperture. According to an embodiment of the invention the medical device applicator may include a cooling plate and the intermediate scattering element may be positioned between the antenna apertures and the cooling plate. According to an embodiment of the invention the medical device applicator may further include one or more coolant chambers positioned between the cooling plate and the antenna aperture. According to an embodiment of the invention the medical device applicator may include at least two central scattering elements positioned under the aperture wherein the at least one intermediate scattering element may be positioned between the central scattering elements. According to an embodiment of the invention the central scattering elements may be positioned substantially in a center of one of the antenna apertures. According to an embodiment of the invention the long axis of the intermediate scattering element may be shorter than the longest dimension of the central scattering element. According to an embodiment of the invention the intermediate scattering element may be manufactured from a material which may have the same dielectric constant as the central scattering element. According to an embodiment of the invention the intermediate scattering element may be made from alumina. According to an embodiment of the invention the intermediate scattering element may be made from a material which may be more than 90 percent alumina. According to an embodiment of the invention the intermediate scattering element may be made from a material which may be approximately 96 percent alumina. According to an embodiment of the invention the intermediate scattering element may be made from, for example silicone. According to an embodiment of the invention one or more temperature measurement devices may be positioned on the cooling plate under the intermediate scattering element. According to an embodiment of the invention the one or more temperature measurement device may be one or more thermocouples.
According to an embodiment of the invention a medical device applicator may include at least a first and a second waveguide antenna and at least a first electrically conductive shim positioned between the waveguide antennas. According to an embodiment of the invention each of the waveguide antennas may include: a dielectric core having four sides; metal plating on three sides of the dielectric core, the fourth side of the dielectric core forming an antenna aperture. According to an embodiment of the invention the electrically conductive shim may be copper. According to an embodiment of the invention the electrically conductive shim may be approximately 0.025 inches thick. According to an embodiment of the invention the electrically conductive shim may be positioned between the first and second waveguide antennas such that an edge of the electrically conductive shim may be adjacent the antenna apertures. According to an embodiment of the invention an intermediate scattering element may be positioned under the conductive shim. According to an embodiment of the invention central scattering elements may be positioned under the antenna apertures. According to an embodiment of the invention the medical device applicator may include a cooling plate. According to an embodiment of the invention the intermediate scattering element and the central scattering element may be positioned between the antenna apertures and the cooling plate. According to an embodiment of the invention the medical device applicator may include a coolant chamber positioned between the antenna apertures and the cooling plate. According to an embodiment of the invention the medical device applicator may include temperature sensors positioned on the cooling plate.

## Claims

1. A method of creating a lesion in skin, said method comprising the steps of:
positioning an apparatus including a plurality of waveguide antennas adjacent a skin surface with an output of the waveguide antennas being separated from the skin surface by a cooling chamber and a cooling plate;
supplying energy to a first waveguide antenna at a first power level for a first predetermined time period;
supplying energy to a second waveguide antenna at a second power level for a second predetermined time period;
supplying energy simultaneously to both said first waveguide antenna and said second waveguide antenna for a third time period, wherein, during said third time period said energy is supplied to said first waveguide antenna at a third power level and said energy is supplied to said second waveguide antenna at a fourth power level, such that the first waveguide antenna and the second waveguide antenna have a balanced output.

2. The method of claim 1 wherein said energy supplied to said first waveguide antenna is in phase with said energy supplied to said second waveguide antenna.

3. The method of claim 1 wherein said energy supplied to said first waveguide antenna is phase shifted from said energy applied to said second waveguide antenna.

4. The method of claim 3 wherein said energy supplied to said first waveguide antenna is phase shifted 180 degrees from said energy applied to said second waveguide antenna.

5. The method of claim 3 wherein said energy supplied to said first waveguide antenna is phase shifted between 1-180 degrees from said energy applied to said second waveguide antenna.

6. The method of claim 5 wherein energy output from said first waveguide antenna is in phase with energy output from said second waveguide antenna.

7. The method of claim 3 wherein said energy supplied to said first waveguide antenna is phase shifted from said energy applied to said second waveguide antenna, said phase shift being sufficient to cause energy output from said first waveguide antenna to be in phase with energy output from said second waveguide antenna.

8. The method of claim 7 wherein said first power level is greater than said second power level.

9. The method of claim 8 wherein energy output from said first waveguide antenna is equal to energy output from said second waveguide antenna.

10. The method of claim 1 wherein said first and second power levels are equal.