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Advantages of new medical liquid nitrogen cryocooler

Time: 2019-06-06 10:35 Source: unknown Author: Bander liquid nitrogen tank Click: second
Compared with the traditional domestic products of the same type, the portable pressure storage liquid nitrogen cryotherapy device designed and manufactured with the above structure has the following obvious advantages: Self pressurized liquid nitrogen tank

1) Small volume, light weight, exquisite and beautiful shape
The special stainless steel vacuum insulated thermos bottle used as liquid storage bottle is made of double-layer thin-wall stainless steel tube shell. It is small in size and light in weight. Almost all parts are made of stainless steel, so it will not rust. After fine processing of parts, assembled in a variety of color storage bottles, very delicate and beautiful.

2) The infusion pressure is high, and the refrigeration effect of the freezing head is strong
Due to the closed pressure storage of liquid nitrogen, the vaporized nitrogen in the bottle is stored in the liquid storage bottle and gradually forms pressure. The longer the storage time is, the greater the pressure will be, and the more liquid nitrogen will be injected to the freezing head. Therefore, the refrigeration efficiency of the freezing head is strong and the cooling rate is fast. Generally, the cooling head can be reduced to less than 180% within 8 seconds.

3) Safe and reliable operation: quick thawing and rewarming of freezing head
High vacuum insulation because the liquid storage bottle does not frost on the surface and does not freeze hands, its rigidity is good and its pressure is high. The actual working pressure is ten times of the explosion pressure of the bottle body, and it is equipped with a safety valve protection device for automatic overpressure venting. Therefore, the liquid storage bottle will never burst. Because of the large hydraulic pressure, long maintenance time and continuous injection of liquid nitrogen, the treatment can be carried out continuously. The special hollow thin-wall cryocooler has small heat capacity, it can not only cool down quickly when using liquid nitrogen refrigeration, but also can quickly and naturally thaw and rewarming when the liquid nitrogen refrigeration is stopped. Generally, in more than 10 seconds, the cryohead can naturally recover to normal temperature and separate from the frozen mucosal tissue, thus ensuring the safety and reliability of the treatment.

4) The amount of liquid nitrogen injection can be controlled and applied widely
There are three ways to adjust the liquid nitrogen injection quantity: one is to control the weight of the injection valve rod with the index finger, that is, to control the lifting degree of the injection valve stem to control the opening of the injection valve; the other is to use the eccentric setting of the injection valve on the bottle cap. The liquid nitrogen injection amount is controlled by pushing the angle of the injection valve rod, and the pull rod is pulled forward There is a large amount of dynamic liquid nitrogen injection, but a small amount of liquid nitrogen is pulled backward, and the amount of liquid nitrogen injection is moderate in the middle position; another method is to use the freezing head for contact
During the treatment, the liquid nitrogen injection volume can be controlled by adjusting the opening of the external plastic pipe clamp at the tail end of the jet pipe to adjust the gas output.
In view of the high infusion pressure and the large amount of liquid nitrogen directly ejected after removing the cryoprobe, it is not only suitable for cryosurgery with medium and small cooling capacity, but also suitable for the surgery that needs large amount of freezing to destroy tumor. When the special cold spray needle is set on the front end of the jet tube, liquid nitrogen can be ejected in a small jet with great force, which can meet the clinical needs of cryosurgery and other fine treatment. Its application scope is 10 It is widely distributed.

5) Liquid nitrogen is stored under livestock pressure, and the evaporation loss is less
According to the thermodynamic principle, low temperature liquid with pressure storage can greatly reduce its evaporation capacity. In view of the closed pressure storage mode of liquid nitrogen and good air tightness, under the effect of pressure in the bottle, the liquid nitrogen evaporation is very slow, so the evaporation loss of liquid nitrogen is less, and the liquid nitrogen stored at the bottom of the bottle can almost be used up. According to the test, a bottle of liquid nitrogen (500ml) at room temperature and pressure after standing for 18 hours, the liquid nitrogen evaporates. Every full bottle of liquid nitrogen can be used intermittently for one day, which can treat dozens of patients (except gynecological patients). Therefore, it saves a lot of liquid nitrogen and the labor and effective treatment time of doctors frequently filling liquid nitrogen, and reduces the cost of medicine.

6) The structure is simple and the operation is dexterous and convenient
Before use, the operator just needs to screw off the bottle cap, fill liquid nitrogen directly into the liquid storage bottle, then close the bottle cap, select and install the appropriate freezing head (needle), and then do the preparatory work before the operation. When using, the operator only needs to hold up the liquid storage bottle with the right hand, hook the pull rod with the index finger at any time, and the liquid nitrogen will spray to the freezing head at a high pressure, so that the freezing head can quickly cool down, and then start to treat the lesions Cryotherapy was performed. Release the pull rod, the freezing head stops refrigeration and can quickly and naturally thaw and rewarming. When it is used again, the operator does not need to make any other preparation, and can continue to carry out the treatment work by extracting the static cryotherapy device. During the operation, the operator can tilt the bottle body arbitrarily and change the treatment angle, so the operation is very dexterous and convenient. Self pressurized liquid nitrogen tank

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