Christopher Paul Hancock,Patrick Burn,Malcolm White
申请号：
GB201705172
公开号：
GB2560973A
申请日:
2017.03.30
申请国别(地区):
GB
年份:
2018
代理人:
摘要：
An electrosurgical instrument 200 for delivering microwave electromagnetic EM energy into biological tissue, the instrument 200 comprising: a coaxial cable 202 for conveying microwave EM energy at a first and a second frequency, the second frequency being higher than the first； and a radiating tip portion 204 disposed at a distal end of the coaxial cable 202 to receive microwave EM energy from coaxial cable 202. Radiating tip portion 204 has a first effective relative permeability at the first frequency and a second effective relative permeability at the second frequency, where the first and second effective relative permeabilities are selected to cause an electrical length of the radiating tip portion 204 to support resonance at the first and second frequency respectively. Radiating tip portion 204 may comprise a second dielectric material 216 different from a first dielectric material 210 of coaxial cable 202. Second dielectric 216 material may be ferrimagnetic. Radiating tip portion 204 may comprise a magnetizing element for applying a magnetic bias field to the second dielectric material, where the magnetizing element may be controllable to adjust the magnetic bias field. The magnetising element may be an electromagnetic coil 220 disposed around the second dielectric material 216.
