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Related to umbrella filter: Greenfield filter
A filter placed in a blood vessel to prevent emboli from passing that point. It has been used in the vena cava to prevent emboli reaching the lungs via the chambers of the right heart and pulmonary arteries.
CAUTION!Complications of filter use include perforation of the vein, migration of the filter, or fragmentation and embolization of its parts.
See also: filter