The bird's nest inferior vena cava filter: progress report

Area of Science:

• Vascular Surgery
• Cardiology
• Medical Devices

Background:

• Pulmonary embolism (PE) is a significant cause of morbidity and mortality.
• Inferior vena cava (IVC) filters are used to prevent PE in high-risk patients.
• The Bird's Nest filter is a retrievable IVC filter designed for long-term implantation.

Purpose of the Study:

• To evaluate the safety and efficacy of the Bird's Nest IVC filter in preventing pulmonary embolism.
• To assess the long-term performance of the filter, including complication rates.
• To compare outcomes with the initial and modified filter designs.

Main Methods:

• Retrospective analysis of 568 patients who received the Bird's Nest IVC filter.
• Clinical follow-up of 440 patients with filters in place for ≥6 months.
• Assessment of recurrent PE, IVC filter occlusion, and filter migration.

Main Results:

• The prevalence of recurrent PE was 2.7% and IVC filter occlusion was 2.9% in patients followed clinically.
• Filter migration occurred in 5 patients with the initial design.
• No filter migrations were observed in 147 patients treated with the modified filter, which featured an improved anchoring system.

Conclusions:

• The Bird's Nest IVC filter is safe and effective in preventing pulmonary embolism.
• Filter modification significantly improved stability and eliminated migration events.
• The Bird's Nest filter demonstrates favorable long-term outcomes for PE prevention.