CryoPro Cryo Surgical Flask Frequently asked Questions

Observation
No or restricted spray function. An extremely powerful spray will be noticed when removing the spray aperture and pulling the trigger.

Explanation
Spray apertures may clog – the smaller ones C and D more easily than A and B. Clogging is a result of impurities or ice crystals accumulating in the storage tank or in the bottle itself.

Fix
A spray tip Cleaning Adapter is part of the standard kit of accessories. Follow enclosed instructions.

Prevention
- Clean the CryoPro can: fill it with warm water and a few drops of dish soap, clean with a soft brush, empty and dry the bottle thoroughly.
- Do not leave the CryoPro open when empty. Leave the top on.
- Clean the storage tank regularly: empty it completely before refilling. Use a vacuum cleaner for 20 – 30 min. to create air circulation in the empty tank to dry out water from melting ice crystals (the hose should be positioned approx. half ways into the tank).

Observation
After some time a “cold spot” develops on the bottle. The liquid nitrogen evaporates faster than normal, and the pressure relief valve may sound louder than normal.

Explanation
A “cold spot” indicates direct thermic contact between the inner and outer bottle. It may be the result of mechanical damage (visible or invisible). Pressure relief valve OK.

Fix
Bottle replacement necessary.

Observation
The top cover gets covered with condensation – sometimes to an extent where water starts dripping from the top.

Explanation Condensation develops as the result of a cold top cover and high humidity and temperature in the room. It cannot be eliminated but varies according to environmental conditions and the filling level of the unit.

Fix
As such condensation is normal and presents no problem other than the discomfort caused by dripping.

Excess water may be occasionally wiped off, and in addition condensation may be reduced by avoiding overfilling of the unit. A filling level not exceeding 80-90% of the max. capacity leaves an insulating air space between the liquid nitrogen and the top cover, which may help to reduce condensation.

Observation
The unit is empty and needs to be refilled while pressurized.

Fix
Unscrew the top cover counter clock wise. one half turn. Wait ½ - 1 minute for the bottle to depressurize, then fully unscrew the top. Refill and remount the top.

Observation
The top cover has become difficult and “noisy” to turn and tighten.

Explanation
Over time the brass thread on the bottle may become dry.

Fix
Lubricate with a few drops of silicone oil or WD 40.

Observation
No spray function. No spray will be noticed when removing the spray aperture and pulling the trigger.

OBS! Lift the top of the pressure relief valve to distinguish between a clogged main valve (see above) and loss of pressure.

Explanation
Pressure loss may be caused by
1) a missing gasket in the top cover or
2) manipulation of the locked adjustment screw in the pressure relief valve (requires a wrench, a screw driver and application of excessive force. May be indicated by tool marks on the brass top).

Fix
1) Inspect the top cover. Request a replacement gasket if the red silicone gasket inside the cover is missing.
2) Return for repair.

A weak but audible hissing sound originating from the pressure relief valve.

Explanation
The pressure relief valve controls the operating pressure of the unit. As the liquid nitrogen in the bottle is kept at its boiling point, the liquid nitrogen will constantly evaporate for as long as there is still liquefied gas in the bottle.

This evaporation leads to internal pressure build-up, which is kept at a constant and safe level by the pressure relief valve.

Once the internal operating pressure is reached (within a few minutes after filling the unit), the pressure relief valve will vent (“leak”) excess pressure, which is associated with a weak and hissing sound.

Fix
None! The sound is normal and presents no problem. NEVER TRY TO BLOCK OR OTHERWISE MANIPULATE THE PRESSURE RELIEF VALVE!

Observation
Intermittent spray function.

Explanation
On its way from the bottle to the spray aperture, the liquid nitrogen boils violently. For small apertures (size C and D) this will cause an intermittent spray (“spitting”), however, it will not have any adverse effect on the treatment. In Apertures A and B this phenomenon will hardly be noticeable.

Fix
None! “Spitting” is normal and presents no problem.