JPWO2021110677A5 - - Google Patents

Claims (14)

a coaxial transmission line for transmitting radio frequency (RF) energy and microwave energy;
an energy delivery tip coupled to a distal end of the coaxial transmission line, the electrosurgical instrument comprising: an energy delivery tip coupled to a distal end of the coaxial transmission line;
The energy delivery chip includes:
a first electrode electrically coupled to an inner conductor of the coaxial transmission line and protruding beyond a distal end of an outer conductor of the coaxial transmission line;
a second electrode electrically coupled to the outer conductor of the coaxial transmission line and extending coaxially along a portion of the first electrode;
a dielectric disposed between the first electrode and the second electrode,
the first electrode includes a protruding nib that protrudes beyond the distal end of the dielectric;
the second electrode and the dielectric include a portion exposed at the distal end of the energy delivery tip;
The energy delivery tip includes a distally facing end surface having an exposed portion of the dielectric and an exposed portion of the second electrode disposed concentrically about the protruding nib. the electrosurgical instrument has rotational symmetry about the central longitudinal axis of the coaxial transmission line, and the first electrode and the second electrode (i) The electrosurgical instrument configured as a bipolar structure for delivering energy and (ii) an antenna for radiating the microwave energy transmitted by the coaxial transmission line. The electrosurgical instrument of claim 1, wherein the distally facing end surface exhibits a profile that focuses the delivered RF energy onto the protruding nib. 3. An electrosurgical instrument according to claim 1 or 2, wherein the distally facing end surface is conical. The electrosurgical instrument of claim 2, wherein the distally facing end surface is at a 45° angle with respect to the longitudinal axis of the projecting nib. 3. An electrosurgical instrument according to claim 1 or 2, wherein the distally facing end surface is rounded. An electrosurgical instrument according to any preceding claim , wherein the first electrode is formed by a distally extending portion of the inner conductor. An electrosurgical instrument according to any preceding claim, wherein the first electrode is coupled to the inner conductor via a connector rod. The electrosurgical instrument of claim 7, wherein the connector rod includes a proximal sheath secured to an outer surface of the inner conductor. An electrosurgical instrument according to claim 7 or 8, wherein the connector rod is connected to the inner conductor by crimping. An electrosurgical instrument according to any preceding claim , wherein the second electrode comprises a conductive sleeve having a proximal portion overlying a distal portion of the outer conductor. 11. The electrosurgical instrument of claim 10, wherein the conductive sleeve is secured to the outer conductor by crimping. The electrosurgical device of any one of claims 1 to 11, further comprising an outer insulating jacket disposed over a distal portion of the coaxial transmission line and a proximal portion of the energy delivery tip. utensils. An electrosurgical instrument according to any one of claims 1 to 12 , wherein the antenna is configured as an impedance converter for coupling the microwave energy into living tissue. 14. The first electrode, the dielectric, and the second electrode have lengths selected to cause the energy delivery chip to operate as a quarter wavelength converter for the microwave energy. Electrosurgical instruments as described.