Laser as a means of clinical application has spread to the treatment of hundreds of diseases in various departments such as internal medicine, surgery, gynecology and so on. There are four basic methods: laser surgery, weak laser therapy, laser photodynamic therapy, and laser endoscopic therapy. The application of laser in clinical treatment can help to improve the treatment effect.

Dermatological applications are mostly Nd: YAG laser, CO2 laser, pulsed dye laser, helium-neon laser, excimer laser, etc., widely used in the treatment of pigmented nevus, seborrheic keratosis, nevus of Ota, freckles, port-wine stains, vitiligo, etc. disease.

Laser was first used in ophthalmology clinically, and it is also a discipline with relatively mature application of laser in medicine. Ophthalmology applications are more YAG laser, argon ion and excimer laser.

Lasers have been used in otolaryngology to treat chronic rhinitis, allergic rhinitis, acute tonsillitis, acute and chronic otitis media, acute laryngitis, vocal cord nodules and common nasal diseases.

The application of laser in internal medicine mainly adopts low-power laser treatment technology, that is, the use of low-power laser to irradiate human tissue to achieve functions such as enhancing cell activity, promoting and improving microcirculation, accelerating lymph flow, and improving nerve excitation characteristics. There are three main methods: laser physiotherapy, laser acupuncture and low-power laser intravascular irradiation therapy. The lasers used mainly include helium-neon lasers, helium-cadmium lasers, nitrogen molecular lasers, CO2 lasers and semiconductor lasers.

The application of laser in surgery is mainly to separate, cut, excise, coagulate, weld, perforate, osteotomy, etc. with conventional surgical instruments using laser beams instead of metals to remove lesions and anastomosis tissue, blood vessels, lymphatic vessels, nerves, etc. Wait. Laser treatment systems for surgery are called light knives. According to their mechanism of action, they are divided into two categories: hot light knives and cold light knives.

Photodynamic therapy for the treatment of malignant tumors is a new method that has been used in clinic since the late 1970s. It can perform both fluorescent tumor diagnosis and photochemotherapy. In dermatology, it is used for the treatment of acne, condyloma acuminatum, port-wine stains, etc