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Related to umbrella filter: Greenfield filter
a small, porous, umbrella-shaped device that can be inserted into the vena cava or other blood vessel to trap blood clots. It is used in patients who have contraindications to anticoagulation or who have failed anticoagulation.
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