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Laser application in medicine

source:方德激光 author:管理员 The release date:03-31


 Laser application in medicine 

The application of laser in medicine is divided into two categories: laser diagnosis and laser treatment. The former uses laser as an information carrier, and the latter uses laser as an energy carrier. Over the years, laser technology has become an effective means of clinical treatment and a key technology for the development of medical diagnosis. It solves many problems in medicine and contributes to the development of medicine. At present, it has maintained a sustained and strong development momentum in many aspects such as basic research, new technology development, and new equipment development and production.

When a laser is applied to a living organism, it is absorbed and converted into thermal energy. If the power is equal, the temperature can reach hundreds to thousands of degrees within a few milliseconds, which can denature, solidify, carbonize and gasify the tissue protein. Due to the high energy of the laser, a strong light pressure can be generated, and the surface pressure of the focused laser can reach 200g / cm2. This mechanical action, together with the thermal effect, can make the laser a "light knife" for surgically cutting tissue and treating superficial tumors such as melanoma, squamous epithelioma, papilloma, angiofibromas, breast tumors, etc. Laser can also be used to remove burnt eschar. In the ophthalmology department, a laser is used for iris resection to treat secondary pupillary closure, which can make the patient see the light again. This operation does not require suture removal, does not cause infection, and is superior to conventional surgery.

The high-energy laser is used to irradiate the rupture of the fundus retina after detachment, allowing it to coagulate and stick-"welding" the retina

Laser systems for dental applications

According to the different roles of laser in dental applications, it is divided into several different laser systems. One of the important characteristics that distinguishes lasers is: the wavelength of light. Lasers with different wavelengths have different effects on tissues. Light in the visible and near-infrared spectral range has low light absorption and strong penetrability, and can penetrate into dental tissues. Deep parts, such as argon ion laser, diode laser or Nd: YAG laser (see Figure 1). The Er: YAG laser and the CO, the laser light has poor penetrability, and can only penetrate about 0.01 mm of tooth tissue. Another important feature that distinguishes lasers is the intensity (ie power) of the laser, such as a diode laser used in diagnostics. Its intensity is only a few milliwatts, and it is sometimes used on laser displays.

The laser used for treatment is usually a few watts of medium intensity laser. The effect of laser on tissues also depends on the emission mode of laser pulses. The typical continuous pulse lasers are: argon ion laser, diode laser, CO2, laser; the lasers emitted by short pulse are: Er: YAG laser Or many Nd: YAG lasers, the intensity (ie power) of short-pulse lasers can reach 1,000 watts or more. These high-intensity, high-light-absorbing lasers are only suitable for removing hard tissues.

The application of laser in the diagnosis of dental caries

1. Demineralization, superficial caries

2. Occult caries

Application of laser in treatment

Cut

2. Aggregation of fillings and cavity treatment




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