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Structure design of portable pressure storage liquid nitrogen cryotherapy device

Time: 2019-06-06 10:33 Source: unknown Author: Bander liquid nitrogen tank Click: second
Abstract: This paper introduces the structure design of a new type of hand-held pressure storage liquid chlorine cryotherapy device. It uses a small stainless steel vacuum insulated bottle as the main body, and is equipped with a pull rod plunger type jet valve and a safety cover. Because of the liquid nitrogen pressure storage mode, the vaporization of liquid nitrogen is slowed down, and there is pressure in the liquid storage bottle. Once the pull rod is pulled down, the liquid nitrogen can be greatly increased The pressure of the spray. It can not only make the cryoprobe cool down quickly, but also can eject the liquid nitrogen jet with great force through various cold spray needles. It is easy to operate, safe to use and has good therapeutic effect. It can be used in the cryotherapy of Cosmetology, dermatology, otorhinolaryngology, Stomatology, gynecology, oncology, etc. Self pressurized liquid nitrogen tank

Key words: liquid nitrogen; freezing; therapeutic apparatus; pressure storage; cold head; cold spray needle

Since 1960s, hypothermia has been widely used in clinical treatment at home and abroad. The use of liquid nitrogen as the cold source of hand-held cryotherapy device is more popular. In the past, the hand-held liquid nitrogen cryotherapy apparatus made in China was composed of small glass thermos cup (bottle), cup cover (or rubber stopper), stuffy pressure valve (or latex tube), infusion tube and copper freezing head.

This kind of portable liquid nitrogen cryotherapy device is simple and practical, and has played a great role in the early stage of cryotherapy in China, but it has the following disadvantages: low infusion pressure, inconvenient operation, large waste of liquid nitrogen volatilization, frequent manual filling, small cooling capacity of the freezing head, slow cooling, no small beam of liquid nitrogen, easy corrosion of the shell, air leakage due to aging of the rubber seal, easy explosion and safety of the glass container Poor sex and other defects. It is understood that this kind of medical refrigeration equipment used in domestic hospitals is difficult to match in the market due to the damage of parts and explosion of glass insulation Cup.

Most of them are now abandoned. In recent years, the hand-held liquid nitrogen cryotherapy device made of stainless steel heat preservation cup has appeared in the market in recent years. However, the structure has not been greatly improved, except that the thermos cup will not burst, it has not changed the original "congenital deficiency". Due to the constraints of cold source supply, low market demand, poor economic benefits and other objective factors, the development of cryosurgery instruments in China is very backward. At present, there are few manufacturers of this kind of products in China. On the one hand, there is a lack of new frozen surgical instruments for the market, on the other hand, many medical units want to buy no door; however, many hospitals have to resume the original cotton swab dipping liquid nitrogen coating method to maintain the development of refrigeration business. Self pressurized liquid nitrogen tank

The above situation shows that the structure design of the hand-held liquid nitrogen cryotherapy device is not reasonable, the technical performance is poor, and the manufacturing process is rough, the shape is not beautiful, and the gear is low, so it can not adapt to the development of cryotherapy in China. In order to change this backward situation as soon as possible, the market needs to develop and produce a new type of hand-held cryotherapy device with more advanced performance, exquisite technology, beautiful appearance and popularization and application, so as to meet the clinical needs of the majority of cryosurgery workers.

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