Patent attributes
An electrosurgical instrument capable of supporting resonance of microwave energy at multiple frequencies. The instrument comprises a coaxial cable and a radiating distal tip portion arranged to receive microwave energy from the coaxial cable. The radiating tip portion consists of a dielectric material having an electrical length selected in conjunction with its dielectric properties at three or more frequencies of microwave energy to support resonance at each frequency. By providing a single device that can effectively couple microwave energy into biological tissue at three or more frequencies, tissue ablation can be performed rapidly with accuracy. The instrument may be used in an apparatus that includes a generator arranged to supply microwave energy at three or more different frequencies.
