Abstract: A shaft assembly for a microwave ablation applicator which includes a shaft assembly and an antenna assembly located within the shaft assembly is disclosed. The shaft assembly comprises an elongate shaft which extends from a first end to a second end thereof, and which defines therein a hollow inner volume and a longitudinal axis of the antenna assembly, and an applicator tip mounted on the second end of the elongate shaft. The shaft assembly further includes a coolant delivery tube having a side wall which defines an elongate hollow interior.

Abstract: A method and system for monitoring tissue temperature during microwave ablation of such tissue is disclosed. The method includes applying a predetermined correction value to a temperature measurement to provide a corrected temperature value.

Abstract: A microwave ablation antenna assembly (20) incorporates a choke assembly (40) having a dielectric element (42) and a conducting element (48). The conducting element (48) is chosen from a group of elements of fixed length, but with differing electrical lengths for providing cancellation properties for different wavelengths of microwave energy.

Abstract: A method and system for monitoring a microwave tissue ablation process, particularly the determination of an ablation size estimate during microwave ablation of such tissue. The method includes applying a correction value to the determined temperature value, so as to provide a corrected temperature value.

Abstract: A microwave ablation antenna assembly includes an elongate body that extends from a first end to a second end thereof, and which defines therein a hollow inner volume and a longitudinal axis of the antenna. The ablation antenna assembly includes an applicator tip portion mounted on the second end of the elongate body, an elongate coaxial conductor assembly for connection to a source of microwave energy, a dipole tip portion that extends from the feed point of the coaxial conductor assembly towards the applicator tip, and a choke assembly with first and second choke conductors.

Abstract: A shaft assembly for a microwave ablation applicator which includes a shaft assembly and an antenna assembly located within the shaft assembly is disclosed. The shaft assembly comprises an elongate shaft which extends from a first end to a second end thereof, and which defines therein a hollow inner volume and a longitudinal axis of the antenna assembly, and an applicator tip mounted on the second end of the elongate shaft. The applicator tip defines an annular slot with which the second end of the elongate shaft engages. At least part a portion of the second end of the shaft is of a fibre reinforced plastics material having a plurality of elongate fibres bound in a plastics material, at least some of the fibres extending at least partially circumferentially around the annular slot of the applicator tip.

Abstract: A shaft assembly for a microwave ablation applicator having a shaft assembly and an antenna assembly located within the shaft assembly is disclosed. The shaft assembly comprises an elongate shaft which extends from a first end to a second end thereof and an applicator tip mounted on the second end of the elongate shaft.

Abstract: A shaft assembly for a microwave ablation applicator which includes a shaft assembly and an antenna assembly located within the shaft assembly is disclosed. The shaft assembly comprises an elongate shaft (22) which extends from a first end to a second end thereof, and which defines therein a hollow inner volume and a longitudinal axis of the antenna assembly; and an applicator tip (24) mounted on the second end of the elongate body. The elongate shaft (22) comprises a first shaft portion (44) which extends longitudinally from the first end of the shaft (22) to an engagement region between the first and second ends of the shaft (22), and a second portion (46) which extends longitudinally from the engagement region to the second end of the shaft (22). The first shaft portion (44) is of a carbon reinforced plastics material, and the second shaft portion (46) is of a fibre reinforced plastics material having fibres which are non-electrically conductive.

Abstract: A microwave ablation antenna assembly (20) incorporates a choke assembly (40) having a dielectric element (42) and a conducting element (48). The conducting element (48) is chosen from a group of elements of fixed length, but with differing electrical lengths for providing cancellation properties for different wavelengths of microwave energy.

Abstract: A shaft assembly (20) for a microwave ablation applicator which includes a shaft assembly (20) and an antenna assembly (26) located within the shaft assembly (20) is disclosed. The shaft assembly (20) comprises an elongate shaft (22) which extends from a first end (201) to a second end (202) thereof, and which defines therein a hollow inner volume and a longitudinal axis of the antenna assembly, and an applicator tip (24) mounted on the second end (202) of the elongate shaft. The shaft assembly (20) further includes a coolant delivery (80) tube having a side wall which defines an elongate hollow interior (82).

Abstract: A method and system for monitoring a microwave tissue ablation process, particularly the determination of an ablation size estimate during microwave ablation of such tissue.

Abstract: A method and system for monitoring tissue temperature during microwave ablation of such tissue is disclosed. The method includes applying a predetermined correction value to a temperature measurement to provide a corrected temperature value.

Abstract: A microwave ablation antenna assembly (20) incorporates an improved choke assembly (40) which provides the antenna assembly (20) with both a largely spherical ablation pattern and an improved impedance matching characteristic.

Abstract: An electrosurgical system includes at least a first unit and a second unit, the second unit being detachably connectible to the first unit and including an electrode assembly. The first unit includes a power supply, an RF oscillator circuit for generating a radio frequency output, and an output stage adapted to supply an RE output to the electrode assembly. The second unit includes an identification circuit presenting, in an alternating manner, a parameter with a first finite non-zero value for a first time period, and a parameter with a second finite value for a second time period. The first unit includes a sensing circuit and a controller adapted to detect a characteristic of the identification circuit and provide an output signal, the controller connected to the sensing circuit and receiving the output signal, adjusts the RF output so as to suit the particular electrode assembly.

Abstract: An electrosurgical system includes at least a first unit and a second unit, the second unit being detachably connectible to the first unit and including an electrode assembly. The first unit includes a power supply, an RF oscillator circuit for generating a radio frequency output, and an output stage adapted to supply an RE output to the electrode assembly. The second unit includes an identification circuit presenting, in an alternating manner, a parameter with a first finite non-zero value for a first time period, and a parameter with a second finite value for a second time period. The first unit includes a sensing circuit and a controller adapted to detect a characteristic of the identification circuit and provide an output signal, the controller connected to the sensing circuit and receiving the output signal, adjusts the RF output so as to suit the particular electrode assembly.