Surgeons implant retrievable inferior vena cava filters (IVCs) in the veins of patients who are unable to take anticoagulants (blood thinners) in order to prevent blood clots from moving to the lungs. IVCs catch the clots in the blood stream and, over time, the clots dissipate. They are small, metal devices that resemble a metal cage and are surgically inserted into a patient’s vein. There are two types of IVC filters: permanent and optional/retrievable filters. Retrievable filters provide short-term protection. They’re designed to be removed from a patient’s body when there is no longer a risk for pulmonary embolism (PE). Unfortunately, they are not always able to be retrieved and can cause severe medical complications.