US 12,011,219 B2
Electrosurgical instrument
Christopher Paul Hancock, Bath (GB); Patrick Burn, Chepstow (GB); and Pallav Shah, Chepstow (GB)
Assigned to CREO MEDICAL LIMITED, Chepstow (GB)
Appl. No. 17/058,541
Filed by CREO MEDICAL LIMITED, Chepstow (GB)
PCT Filed May 24, 2019, PCT No. PCT/EP2019/063489
§ 371(c)(1), (2) Date Nov. 24, 2020,
PCT Pub. No. WO2019/228928, PCT Pub. Date Dec. 5, 2019.
Claims priority of application No. 1808806 (GB), filed on May 30, 2018.
Prior Publication US 2021/0196377 A1, Jul. 1, 2021
Int. Cl. A61B 18/18 (2006.01); A61B 1/018 (2006.01); A61B 18/14 (2006.01); A61B 18/16 (2006.01); A61B 18/00 (2006.01)
CPC A61B 18/1815 (2013.01) [A61B 1/018 (2013.01); A61B 18/1492 (2013.01); A61B 18/16 (2013.01); A61B 2018/00541 (2013.01); A61B 2018/00577 (2013.01); A61B 2018/00601 (2013.01); A61B 2018/00982 (2013.01); A61B 2018/00994 (2013.01); A61B 2018/1861 (2013.01)] 22 Claims
OG exemplary drawing
 
1. An electrosurgical instrument comprising:
a coaxial feed cable for conveying microwave energy and radiofrequency energy, the coaxial feed cable having an inner conductor, an outer conductor, and a first dielectric material separating the inner conductor and the outer conductor; and
a radiating tip portion disposed at a distal end of the coaxial cable to receive the microwave energy and the radiofrequency energy, the radiating tip portion comprising:
a tip body made of a second dielectric material, the tip body having a proximal end that is connected to a distal end of the coaxial feed cable and a distal end facing away from the coaxial feed cable, wherein the tip body includes an end face at the distal end of the tip body; and
a first electrode and a second electrode disposed on the end face of the tip body, the second electrode being spaced from the first electrode by a portion of exposed second dielectric material,
wherein the first electrode is electrically connected to the inner conductor of the coaxial feed cable by a conductive element that extends through a channel in the tip body,
wherein the second electrode is electrically connected to the outer conductor of the coaxial cable by a field-shaping conductive structure formed in or on the tip body,
wherein the first electrode and second electrode are configured as active and return electrodes for delivering the radiofrequency energy,
wherein the conductive element and the field-shaping conductive structure are configured as an antenna for emitting the microwave energy,
wherein the field-shaping conductive structure is configured to shape a radiation profile of microwave energy emitted from the radiating tip portion, and
wherein the second electrode comprises a conductive cap mounted over the distal end of the tip body, and wherein the cap covers the end face of the tip body except for an exposed aperture within which first electrode is revealed.