Electrosurgical Unit Uses: What an ESU Does Across Surgical Specialties

What is electrosurgery and what are electrosurgical units?

Electrosurgery is the use of high-frequency alternating current to heat tissue in a controlled way. An electrosurgical unit (ESU), also called a generator or diathermy machine, converts mains power into current at frequencies of hundreds of kilohertz, above the range that stimulates nerves and muscles. The BOWA ARC 400, for example, has an output frequency of 350 kHz.

The surgeon holds an active electrode, in a pencil or an instrument, and the generator shapes the waveform. Depending on settings, the same system can cut, coagulate, desiccate or seal tissue. The principle is covered in how an electrosurgical generator works.

Electro surgical unit used for: cutting and coagulation

The two core effects are cutting, where concentrated energy vaporises tissue along a line, and coagulation, where lower heat denatures proteins and closes small vessels. Blended modes combine both. In everyday terms, an electro surgical unit is used for making incisions with limited blood loss, controlling bleeding during dissection and, with some generators, sealing larger vessels.

Monopolar and bipolar delivery cover different needs. Monopolar spreads the current to a return electrode on the patient, while bipolar confines it between two tips; see monopolar vs bipolar electrosurgery. Waveform options are described in cut, coag and blend waveforms.

Electrosurgical unit applications by specialty

Electrosurgical unit applications span general and visceral surgery, gynaecology, urology, ENT, orthopaedics, plastic and reconstructive surgery, neurosurgery, thoracic and cardiac surgery, and dermatology and minor procedures. BOWA lists applications from general, thoracic and paediatric surgery to gynaecology, urology, ENT, neurosurgery and cardiac surgery for the ARC 350.

Endoscopic use deserves its own mention. In urology, bipolar resection and enucleation use saline-compatible systems, such as the Richard Wolf HF-GENERATOR 2260 with presets for monopolar and bipolar TUR-P, TUR-B, bipolar enucleation, laparoscopy and hysteroscopic resection. In laparoscopy, bipolar instruments such as ERGOact allow coagulation without a foot pedal. See also electrosurgical unit for endoscopy.

• General surgery: incision, dissection, haemostasis
• Gynaecology: laparoscopic and hysteroscopic procedures
• Urology: resection and enucleation in saline
• ENT, plastic and neurosurgery: fine coagulation at low power
• Minor surgery and clinics: simple monopolar or bipolar units

Types of units and what to look for when buying

Units range from compact single-purpose devices to multifunction generators that handle monopolar, bipolar, vessel sealing and argon modules. The ARC 400 supports up to five instruments connected at once, instrument recognition via RFID, and a LIGATION function for bipolar vessel sealing. The ARC 350 offers four outputs, two monopolar and two bipolar, and optional LIGATION sealing of vessels up to 7 mm with BOWA instruments.

When comparing, check output power at stated load, number of sockets, neutral electrode monitoring, preset libraries, software updates and instrument range. A short overview of options is in types of electrosurgical units; a procurement guide with pricing logic is in electrosurgical generator price.

Safety and next steps

Electrosurgery carries known risks, including burns at the return electrode site, fire with flammable preps and interaction with implanted devices. A good ESU supports safety with return electrode monitoring and self-testing. Staff training, correct pad placement and regular checks matter as much as the hardware; see electrosurgery safety guidelines.

Beckfinity supplies BOWA and Richard Wolf electrosurgical systems in the UAE. To discuss which configuration suits your specialties, request a quote or browse the BOWA range.