US 12,295,653 B2
Electrosurgical instrument
Christopher Paul Hancock, Bath (GB); George Ullrich, Bangor (GB); Steve Morris, Chepstow (GB); David Webb, Bangor (GB); Shaun Preston, Chepstow (GB); Leif Geoghegan, Chepstow (GB); Dan Crocker, Chepstow (GB); and Sandra Swain, Chepstow (GB)
Assigned to CREO MEDICAL LIMITED, Chepstow (GB)
Appl. No. 17/280,135
Filed by CREO MEDICAL LIMITED, Chepstow Wales (GB)
PCT Filed Oct. 1, 2019, PCT No. PCT/EP2019/076567
§ 371(c)(1), (2) Date Mar. 25, 2021,
PCT Pub. No. WO2020/070113, PCT Pub. Date Apr. 9, 2020.
Claims priority of application No. 1816128 (GB), filed on Oct. 3, 2018.
Prior Publication US 2021/0338326 A1, Nov. 4, 2021
Int. Cl. A61B 18/18 (2006.01); A61B 18/12 (2006.01); A61B 18/14 (2006.01); A61B 18/00 (2006.01)
CPC A61B 18/1815 (2013.01) [A61B 18/1206 (2013.01); A61B 18/1477 (2013.01); A61B 2018/00011 (2013.01); A61B 2018/00077 (2013.01); A61B 2018/00083 (2013.01); A61B 2018/0013 (2013.01); A61B 2018/00178 (2013.01); A61B 2018/00589 (2013.01); A61B 2018/1823 (2013.01); A61B 2018/1869 (2013.01); A61B 2218/002 (2013.01)] 22 Claims
OG exemplary drawing
 
1. An electrosurgical instrument comprising:
a coaxial feed cable for conveying microwave energy, the coaxial feed cable having an inner conductor, an outer conductor, and a dielectric material separating the inner conductor and the outer conductor;
an instrument tip disposed at a distal end of the coaxial feed cable to receive the microwave energy; and
a fluid channel for conveying fluid to the instrument tip,
wherein the instrument tip comprises:
a dielectric body;
a radiating structure for radiating the microwave energy into biological tissue, wherein the radiating structure is formed in or on the dielectric body, and wherein the radiating structure includes a first electrode that is electrically connected to the inner conductor, and a second electrode that is electrically connected to the outer conductor, the first electrode and the second electrode being exposed on an outer surface of the dielectric body;
a hollow needle in fluid communication with the fluid channel, the hollow needle being arranged to deliver fluid from the fluid channel to a treatment site, and
a grounding element arranged to electrically connect the hollow needle to the outer conductor;
wherein the radiating structure is coated with an insulating non-stick material.