Atmos S 201 Thorax Operating Instructions Manual page 13

column in the riser quickly drop to zero. This means that there is no vacuum at the patient's
end, thus posing a risk of a renewed pneumothorax.
• If a high (negative) vacuum occurs (e.g. due to deep inhalation), the water in the water lock can
rise through the riser. The vacuum at the patient's end ceases, thus posing a risk of a renewed
pneumothorax.
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