Christopher Paul Hancock,Patrick Burn,Shaun Preston
申请号：
GB201702305
公开号：
GB2559604A
申请日:
2017.02.13
申请国别(地区):
GB
年份:
2018
代理人:
摘要：
An electrosurgical apparatus comprising: a feed line for carrying from a generator microwave energy of a frequency； an instrument cable for insertion into a patient to a treatment site comprising a coaxial transmission line for conveying the microwave energy and an internal passageway to provide treatment site access； and a junction to transfer microwave energy between the feed line and the instrument cable. At the microwave energy frequency, the feed line has a first impedance, whilst the instrument cable has a lower second impedance. The junction comprises: a microstrip impedance transformer 100 to match the first and second impedances； and a hollow conduit in fluid communication with the internal passageway. Microstrip impedance transformer 100 may comprise a planar dielectric substrate 115 having opposing upper and lower surfaces, with a ground plane 110 and a microstrip 120 conductor layer on respective lower and upper surfaces. Feed line and instrument cable may be secured to the planar dielectric substrate 115 via conductive attachments connected to ground plane 115. The junction may comprise a conductive shield housing surrounding the quarter wave microstrip impedance transformer. Feed line and instrument cable may be secured to the quarter wave microstrip impedance transformer via the shield housing.
