Which device uses high-frequency electrical current to cut tissue and control bleeding by coagulation?

• A. Surgical Laser
• B. Electrosurgical Unit
• C. Medical Ventilator
• D. Intra-Aortic Balloon Pump

Answer: (B)

This device uses high-frequency electrical current to both cut tissue and control bleeding through coagulation. Electrosurgical units operate in the radiofrequency range, which heats tissue through electrical impedance rather than relying on mechanical cutting alone. A continuous waveform is used for cutting, producing a clean incision, while pulsed or blended waveforms coagulate to seal small vessels and reduce bleeding.

Two common configurations are monopolar and bipolar. In monopolar setup, the current travels from the active instrument through the body to a grounding pad, so proper pad placement is essential. In bipolar setups, the current passes between two tips, offering more localized energy and often increasing safety in certain procedures.

Other devices mentioned have different purposes: a surgical laser uses light energy to cut or coagulate, a medical ventilator supports breathing, and an intra-aortic balloon pump augments circulation. The described function of cutting tissue and achieving hemostasis with electrical energy points to the electrosurgical unit.