The so-called loss-of-overrun pipe is a pipe that can quickly and properly deliver helium to a reasonable location in time when loss-of-overrun occurs.
High field strength magnetic **** vibration generally uses superconducting magnets, which have strict temperature requirements. Therefore, liquid helium is generally required to keep the temperature low, which in turn produces superconductivity.
The so-called loss of superconductivity is the phenomenon where the entire superconducting magnet loses its superconducting properties. As can be understood from the above synopsis, loss of super occurs often due to the fact that the temperature is not sustainably low (near absolute zero).
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Loss of supersession occurs when the temperature of liquid helium rises rapidly. It is easy to understand that the liquid helium changes from a liquid to a gas and expands rapidly, which can be very harmful to the patient if it is not properly discharged from the scanning room. p>I, the reasons for the loss of super
1, the magnet itself structure and coil factors caused by the loss of super: most of the excitation process, the coil fixed resin rupture, the release of heat triggered by the loss of super.
2, superconducting material instability caused by the loss of super: common in the first excitation occurs.
3. Loss of superconductivity caused by damage to the ultra-low-temperature environment of the magnet: Loss of superconductivity may occur when there is insufficient liquid helium, and loss of superconductivity must occur when the vacuum of the magnet is damaged
4. Loss of superconductivity caused by human factors: Loss of superconductivity can be caused by exceeding the rated value of the magnetization current during excitation, or improperly replenishing the liquid helium.
5. Magnet emergency stop unit: Pressing the red emergency stop switch will immediately cause a loss of overrun.
6, other: earthquake, lightning, impact, etc. may cause failure.
Two, the loss of super preventive measures:?
l, daily observation and recording of the liquid helium level, the working status of the water cooler is registered. When the liquid helium level is lower than 40%, add liquid helium in time.
2, the magnet of the external pipeline port routine inspection: the magnet above the exhaust pipeline should be kept free, in order to avoid the pressure inside the container rises and lead to the loss of super. Each pipeline port should be sealed intact, and icing should be dealt with immediately. Loss of super pipe to the outdoor should be dustproof measures. And regular monthly cleaning to prevent clogging.
3, emergency loss of ultra-switch management: emergency loss of ultra-switch is only used for earthquakes, fires and other emergencies endangering the lives of patients. Instructions for use are posted next to the switch.
3. Emergency treatment after loss of ultra
1. The coolant in the magnet evaporates violently, and the gas produced may lead to a lack of oxygen in the scanning room, first evacuate the patient, open all the ventilating devices, doors, and extractor fans, and check the loss of ultra pipe leading to the outdoor area to ensure that it is open, and make sure that there is no alarm on the oxygen detecting device.
2. Immediately notify maintenance personnel to prevent the development of the loss of super.
3. If the patient's life is in danger, notify the emergency room doctor to assist in resuscitation.
4. Examine the magnet thoroughly to find the cause of the loss of super. Replace as soon as possible the safety film at the relevant pipe opening to avoid the formation of ice when air enters the magnet's cryogenic container.
5. If the test confirms that the magnet has not been destroyed, re-establish the superconducting environment and excite the magnet.
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