| ball-valve action |
the intermittent obstruction caused by a free or partially attached foreign body in a tubular or cavitary structure, as by a foreign body in a bronchus, a stone in a bile duct, or a tumor in the cardiac atrium.
출처: www.merckmedicus.com/pp/us/hcp/thcp_dorlands_conte...
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| ball-valve action |
Intermittent obstruction of a passageway or opening so that the flow of fluid or air is prevented from moving in and out in equal amounts.
출처:
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