Cryotherapy

Fig. 12.1

Release of the pressure valve of the liquid nitrogen canister

Solution 2

Never unscrew the cap of the canister near a bystander.

Solution 3

Always unscrew the canister with eye protection. With a gloved hand, pull up on the pressure-release valve while the canister is upright. Keep your face at a distance.

Accidents Happen When

A cup of liquid nitrogen is left unattended in a room. Those unfamiliar with its contents may knock into it inadvertently.

Solution

Dispose of any remaining liquid nitrogen in a cup by pouring it onto the floor. The safest method of doing this is by extending the arm fully away from the face and close to the floor (rather than from a high level).

Accidents Happen When

The liquid nitrogen cup is placed on a Mayo stand, which is unstable. Unintentionally knocking into the stand may spill the liquid nitrogen onto a patient or member of the health care team.

Solution 1

Keep the cup of liquid nitrogen on a counter near the patient rather than on a Mayo stand.

Solution 2

Have an assistant hold the Styrofoam® cup while the patient is being treated.