underwater seal

underwater seal

a seal formed by water allowed to flow over a tube that exits from the chest cavity of a patient. The water acts as a one-way valve and permits the outflow of air but prevents the ingress of air. Also called water trap.
References in periodicals archive ?
Underwater Seal Chest Drains, Thoracic Catheters, Heimlich Valves, Percutaneous Drainage & Mobile Suction Units
AN underwater seal video filmed by a Northumberland GP which featured in The Journal last Saturday has received more than 184,000 online hits.
It can be used with disposable chest drainage units that incorporate an underwater seal, and it features a pressure relief mechanism to minimize the potential for tension pneumothorax.

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