Basic principles and functions of uv phototherapy

Type:Uv phototherapy   Time:2018-08-01 9:01:26
Basic principles and functions

Ultraviolet light therapy for psoriasis, vitiligo. It is a physical therapy technique that uses ultraviolet rays to illuminate the human body to prevent and treat diseases. Ultraviolet light therapy is one of the effective methods for treating MF, especially early MF. Commonly used ultraviolet rays include PUVA, broad-spectrum medium-wave ultraviolet (BB-UVB), and NB-UVB. In 1984, NB-UVB was applied to the clinic. It was mainly used to treat psoriasis vulgaris. Its efficacy was significantly better than that of BB-UVB, which was equivalent to that of PUVA, but the adverse reactions were small.

Ultraviolet phototherapy uses narrow-spectrum UVB technology with a wavelength of 311 nm. Clinical trials have shown that narrow-spectrum mid-wave ultraviolet rays with a wavelength of around 311 nm have significant effects on the treatment of skin diseases such as vitiligo and psoriasis, and are purely physical therapy. The ultraviolet light therapy device emits a medium-wave ultraviolet light having a wavelength of 311 nm, and the ultraviolet light of this wavelength can be mostly absorbed by the epidermal tissue, and thus has a remarkable biological effect on tissues such as skin. Ultraviolet light has good drying, bactericidal and anti-inflammatory effects. It directly kills bacteria or viruses in superficial tissues, accelerates blood circulation, relieves pain and promotes epithelial regeneration. Therefore, ultraviolet radiation treatment can directly kill herpes virus. It can prevent secondary bacterial infection, promote blister absorption, relieve pain, accelerate the repair and healing of skin lesions, and thus play a good therapeutic role. The study also found that ultraviolet light therapy can significantly inhibit the activity of antigen-presenting cells such as epidermal Langerhans cells, reduce inflammation, improve local blood circulation, promote rash healing and relieve pain, and have fewer adverse reactions and easy treatment. .

Irradiation method

The method of irradiating the ultraviolet therapeutic apparatus, hand-held illumination, opening the baffle of the base, taking out the connection line of the irradiator and the base, holding the irradiator, and aligning the UV tube with the affected part. Fixed illumination: Insert the handle of the irradiator into the base slot, aim the UV tube at the affected area; temporarily leave in case of special circumstances during the care. At the end of the irradiation treatment, the number is displayed as ��zero�� and the tube is automatically turned off. The entire irradiation treatment is all over. If you want to use it again, you must start the whole program from the beginning. The time controller has no memory function to set the irradiation time. If you are finished using it, please turn off the power switch, dial out the power plug, clean it and put it into the box.

The irradiation wavelength is 310 to 313 nm.
The initial dose of vitiligo patients is 0.2 J/cm2;
The initial dose of psoriasis patients is 0.3 J/cm 2 ;
If the irradiation intensity of the machine you purchased is 11.00mw/cm2, if the initial irradiation dose is set to 0.2J/cm2, the initial irradiation time can be calculated according to the following two methods:
1) Calculation method:
According to the formula: irradiation time = irradiation dose / irradiation intensity
Irradiation time = 200mJ/cm2/11.00mw/cm2=18s
2) Check the table method:
According to the ��General Irradiation Dose/Intensity/Time Quick Reference Table��, the irradiation time can be directly found. See the table to the right for details.

[Please use under the guidance, pregnant women with caution. Have a history of skin tumors, history of radiation therapy with caution. ��

Tips for use:
(1) Psoriasis uses a water bath before irradiation for 15 to 20 minutes to remove surface scale scales;
(2) Covering or using sunscreen to protect the area around the lesion during irradiation;
(3) Wearing UV goggles to protect the eyes during the irradiation;
(4) Avoid excessive sun exposure on the irradiated area, cover with clothing or use sunscreen when going out;
(5) After the irradiation, if the skin has obvious erythema, it should be adapted to prolong the irradiation interval or reduce the irradiation dose;