An ablation probe (100; 200) comprising: an applicator (102; 202) arranged to apply radiation to heat surrounding tissue; a feeding cable (104; 204) arranged to supply electromagnetic energy to the applicator; a coolant flow path (106, 108) forming a coolant supply circuit; a tubular member (112; 212) housing at least part of the feeding cable (104; 204), wherein a part of the coolant flow path is defined by a space between the feeding cable and the tubular member; and a coupling body (114). The coupling body comprises: a cavity (116) in which the applicator (102; 204) is at least partly encapsulated; a coupling interface (118) at which the coupling body (114) is coupled to the tubular member; and a pointed distal tip (H4a) adapted for piercing tissue.

An antenna system for tissue ablation includes an energy transmission member, a conductive hollow coil member, and a fluid cooling system. The energy transmission member has an inner conductor, an outer conductor, and a dielectric layer between the inner and outer conductors. A portion of the dielectric layer extends distally of a distal end of the outer conductor. The conductive hollow coil member includes a member lumen within a length of the conductive hollow coil member. The conductive hollow coil member is coiled around the portion of the dielectric layer and is separate from the inner conductor. The conductive hollow coil member extends along an entire length of the outer conductor of the energy transmission member. The fluid cooling system is coupled to the conductive hollow coil member for providing a flow of a cooling fluid through the member lumen for cooling the conductive hollow coil member.

Various aspects of the present disclosure are directed toward apparatuses, systems, and methods that may include a microwave ablation probe. The microwave ablation probe may include a feedline having an inner conductor, an outer conductor and a dielectric; and an antenna including a helical arm, the helical arm being electrically connected to the outer conductor of the feedline at a junction point, and a linear arm, the linear arm being electrically connected to the inner conductor of the feedline.

A microwave ablation device including a cable assembly configured to connect a microwave ablation device to an energy source and a feedline in electrical communication with the cable assembly. The microwave ablation device further includes a balun on an outer conductor of the feedline, and a temperature sensor on the balun sensing the temperature of the balun.

A method for forming a resonating structure within a body lumen, the method including advancing a flexible microwave catheter into a body lumen of a patient, the flexible microwave catheter including a radiating portion at the distal end of the flexible microwave catheter, the radiating portion configured to receive microwave energy, and at least one centering device proximate the radiating portion configured to deploy radially outward from the flexible microwave catheter; positioning the radiating portion near tissue of interest; deploying the at least one centering device radially outward from the flexible microwave catheter within the body lumen such that a longitudinal axis of the radiating portion is substantially parallel with and at a fixed distance from a longitudinal axis of the body lumen near the targeted tissue; and delivering microwave energy to the radiating portion such that a circumferentially balanced resonating structure is formed with the body lumen.

An esophageal ablation system including a positioner, an elongated, flexible shaft extending from the positioner, and a microwave emitter assembly disposed near the distal end of the shaft. The emitter assembly includes one or more microwave antennas and a balloon for spacing the antennas relative to target tissue. The device may have an inner balloon for deploying the antenna. The systems, devices and methods disclosed are useful for treating Barrett's Esophagus, Esophageal Adenocarcinoma, and Squamous Cell Carcinoma.

A microwave antenna has a radiating portion connected by a feedline to a power generating source, e.g., a generator. Proximal and distal radiating portions of the antenna assembly are separated by a junction member. A reinforcing member is disposed within the junction member to increase structural rigidity.

A device and method is disclosed for creating a lesion in adventitia tissue of a renal artery and/or a region of tissue surrounding the adventitia tissue while protecting intima and media tissue of the renal artery from injury. A catheter carrying a microwave antenna is positioned within the renal artery. Cooling fluid is circulated around the microwave antenna in thermal contact with the intima of the renal artery. Power is supplied to the microwave antenna to cause microwave energy to be emitted omnidirectionally from the microwave antenna. The power supplied to the microwave antenna and the cooling fluid circulated around the microwave antenna are controlled to cause the adventitia tissue and/or the region of tissue surrounding the adventitia tissue to be heated to a temperature sufficient to cause thermal damage while the intima and media tissue are maintained at a temperature where thermal damage does not occur.

A helical antenna structure for use in an electrosurgical instrument. The helical antenna structure is connectable to inner and outer conductors of a coaxial transmission line, and can act as both a radiating antenna or applicator structure, and also in a mode where an electric field is generated between its electrodes. In this way, the helical antenna structure may be used both for argon plasma coagulation, and deep tissue coagulation, as well as providing means for delivering a fluid, e.g. a therapeutic fluid such as adrenaline. This may be achieved through the use of helically arranged electrodes and a channel for gas to flow. This device is also used to deliver adrenaline and RF/microwave energy.

Various aspects of the present disclosure are directed toward apparatuses, systems, and methods that may include a microwave ablation probe. The microwave ablation probe may include a feedline having an inner conductor, an outer conductor and a dielectric; and an antenna including a helical arm, the helical arm being electrically connected to the outer conductor of the feedline at a junction point, and a linear arm, the linear arm being electrically connected to the inner conductor of the feedline.