A microwave ablation device includes a cable assembly, a feedline, and a transmission line. The cable assembly is configured to connect to an energy source. The feedline is in electrical communication with the cable assembly and includes a first temperature sensor. The first temperature sensor is disposed at a first axial location along a length of the feedline and is configured to sense a temperature at the first axial location. The first temperature sensor extends along the length of the feedline. The transmission line extends from the first temperature sensor and is disposed parallel and in contact with an outer conductor of the feedline.

A method of warming a patient during a surgical procedure may use short-wave diathermy applied with an array of adjacent electrical wire loops that create oscillating electromagnetic fields. Oscillating electric and magnetic fields produce heat in biological tissues by inducing a rapidly alternating movement of charged particles within tissues. The method may be implemented using a short-wave signal generator electrically coupled to the array.

In part, in one aspect, the disclosure relates to a non-invasive skin tightening system. The system may include an applicator comprising a first surface, the first surface defining one or more apertures; a waveguide in communication with the first surface and positioned to direct microwaves through the one or more apertures; and a microwave generator having a peak power, a pulse width, and a microwave frequency. The applicator is a cosmetic treatment applicator in various embodiments.

The invention relates to an electrosurgical system for delivering electromagnetic energy at a plurality of frequencies to cause different effects on biological tissue at a treatment site, and in particular to an electrosurgical generator. The electrosurgical generator comprises an electromagnetic signal supply unit for generating microwave energy to be conveyed on each of a plurality of microwave channels, wherein each of the plurality of microwave channels is arranged to convey microwave energy at a different frequency; an output port configured to be connectable to a probe for delivering microwave energy from the plurality of microwave channels; and a signal combiner configured to connect the plurality of microwave channels to the output port, wherein the signal combiner comprises a band stop filter module disposed at a distal end of each of the plurality of microwave channels, wherein the band stop filter module for each microwave channel is configured to block microwave energy at the frequency conveyed on the other microwave channels; and a common signal pathway extending between the output port and a junction at which the plurality of microwave channels are connected.

Various embodiments provide an electrosurgical instrument comprising: a flexible coaxial transmission line arranged to convey microwave energy; a radiating tip portion connected at a distal end of the flexible coaxial transmission line and configured to receive the microwave energy, the radiating tip portion comprising: a distal coaxial transmission line for conveying the microwave energy; and a needle tip mounted at a distal end of the distal coaxial transmission line, the needle tip being arranged to deliver the microwave energy into biological tissue; and a heat sink mounted at an interface between the flexible coaxial transmission line and radiating tip portion. The heat sink is in thermal communication with a proximal end of the distal coaxial transmission line and configured to draw thermal energy from the radiating tip portion. Also, a maximum outer diameter of the radiating tip portion is smaller than an outer diameter of the flexible coaxial transmission line. An associated electrosurgical system is also disclosed.

An electrosurgical instrument for delivering electromagnetic energy to biological tissue, the instrument comprising an active tip having an electrically conductive protective hull mounted on an underside thereof. The hull has a smoothly contoured convex undersurface, and is formed as a shaped piece of electrically conductive bio-compatible material having a low coefficient of friction with biological tissue (e.g. stainless steel) which has the dual function of (i) physically protecting tissue that lies underneath the active tip, and (ii) providing an electrical connection between a coaxial feed line and the active tip.

The disclosure is directed to an electrosurgical generator comprising: an electromagnetic signal supply unit for generating electromagnetic, EM, energy to be conveyed along each of a plurality of channels. Each of the plurality of channels is arranged to convey electromagnetic energy at a different frequency. The electrosurgical generator further comprises an output port selectively connectable to each of the plurality of channels. The output port is connectable to an electrosurgical instrument for delivering the electromagnetic energy to biological tissue. The electrosurgical generator further comprises a tissue identification unit comprising a controller configured to: detect a signal indicative of a load impedance at the output port; determine a set of complex impedance values from the detected signals; identify a tissue type from the set of complex impedance values; and generate an output for communicating the identified tissue type to a user.