Which device uses light to cut or treat tissue?

• A. Surgical Laser
• B. Electrosurgical Unit
• C. Medical Ventilator
• D. Dialysis Machine

Answer: (A)

Light-based tissue cutting relies on a device that emits a focused beam of light to interact with tissue. A surgical laser delivers high-intensity, precisely controlled light energy that can cut through tissue, vaporize it, or seal vessels to reduce bleeding. The energy is absorbed by the target tissue, causing rapid heating and localized changes that allow clean cutting with minimal surrounding damage. Different wavelengths can be chosen to optimize the effect for various tissue types and depths.

In contrast, an electrosurgical unit uses electric current to cut and coagulate tissue by heat generated from electrical resistance, not by light. A medical ventilator provides breathing support for the patient, not tissue modification, and a dialysis machine removes waste and excess fluid from the blood without interacting with tissue with light.