Based on liquid co for preventing nozzle frosting 2 Rapid cooling device for flash spray

Abstract

The invention discloses a nozzle frosting prevention based rapid cooling device for liquid CO2 flash mist spray. The device comprises a high-pressure nitrogen gas cylinder, a high-pressure carbon dioxide storing tank, a cooling circulating system, a solenoid valve and a nozzle, wherein an outlet of the high-pressure nitrogen gas cylinder is connected to an inlet of the carbon dioxide storing tank;the outlet of the carbon dioxide storing tank is connected to one end of a high-pressure hose; a middle section of the pass of the high-pressure hose is connected to tube side inlet of a sleeve typeheat exchanger; a tube side outlet of the sleeve type heat exchanger is connected to the high-pressure hose; the other end of the high-pressure hose is connected to the solenoid valve; a stainless straight-tube type double-liquid nozzle provided with a heat insulated vacuum layer is mounted at the output end of the solenoid valve. The device can be matched with a laser probe of any laser to use, and the purpose of efficiently and selectively cooling normal epidermal tissue of a patient in a vascular and pigmented skin diseases laser operation can be achieved; the heat loss of epidermis is prevented, and the treatment effect is improved.

Description

technical field [0001] The invention belongs to the technical field of cooling devices, in particular to a rapid cooling device for epidermis in laser skin hyperthermia surgery. Background technique [0002] Port wine stain is a congenital, low-flow intradermal vascular malformation, with an incidence of about 0.3% in newborns, located at a subcutaneous depth of about 200-550 μm (Schneider BV , Mistuhashi Y, Schnyder UW .Ultrastructural observations in port wine stains. Ach Dermatol Res, 1998, 280(6):338-345). And with age, the color of the spots will gradually deepen, showing a pink-red-purple trend, and even scabs and develop into hemangiomas. Because port-wine stains are often located on exposed parts such as the face or neck of the human body, and seldom disappear spontaneously, it brings huge damage to the appearance of the patient and seriously affects the quality of life of the patient. [0003] At present, laser has become the first choice for the treatment of port...

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Problems solved by technology

However, melanin in the epidermis has a strong absorption of light in the visible light range (400nm-700nm), so that a considerable part of the treatment laser is absorbed by melanin during the process of penetrating the epidermis, resulting in two problems: on the one hand, it makes The laser energy that reaches the diseased blood vessels in the dermis is reduced, which directly reduces the therapeutic effect; on the other hand, the large absorption of melanin to the laser will cause the temperature of the epidermis to rise rapidly and burn normal tissues such as the epidermis, which will bring great side effects to the treatment (Ashinoff R, Geronemus RG. Treatment of a port-wine stainin a black patient with the pulsed dye laser. J Dermatol Surg Oncol, 1992,18(2):147-148)

[0007] 1. Taking R134a as an example, its boiling point temperature under atmospheric pressure is relatively high (about -26.07°C), and there are still normal epidermal tissues of patients with deep lesions (especially yellow races with high epidermal melanin content) Problems with poor cooling

[0008] 2. The GWP value of traditional refrigerants such as R134a is very high, which no longer meets the environmental protection requirements of the current era

[0009] 3. R134a dynamic spray cooling will form a liquid film on the skin surface, reducing the spatial selectivity of cooling, and the radius of the spray cross-section is large, making it difficult to accurately control the cooling area during surgery

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