The twist technique: a method to minimize wire prolapse during Bird's Nest filter placement

Area of Science:

• Interventional Radiology
• Medical Device Technology
• Vascular Surgery

Background:

• Inferior vena cava (IVC) filters are crucial for preventing pulmonary embolism.
• Bird's Nest filters are widely used but can be associated with complications.
• Fine-wire prolapse, a potential complication, can lead to filter malfunction or vena cava damage.

Purpose of the Study:

• To evaluate the efficacy of a twist technique in reducing fine-wire prolapse.
• To assess the impact of different numbers of twists on prolapse occurrence and severity.
• To optimize Bird's Nest filter insertion procedures.

Main Methods:

• Retrospective analysis of abdominal radiographs following Bird's Nest filter placement.
• Comparison of filter placement with no twists, two 360-degree twists, and three 360-degree twists.
• Quantitative assessment of prolapse length and frequency.

Main Results:

• No twists: 32% prolapse rate (average length 2.8 cm).
• Two twists: 9.1% prolapse rate (P < .005), reduced filter nest length.
• Three twists: 4.9% prolapse rate (P < .005), similar prolapse frequency to two twists.
• No statistically significant difference in prolapse frequency between two and three twists.

Conclusions:

• The twist technique significantly reduces Bird's Nest filter wire prolapse.
• Both two and three 360-degree twists are effective in mitigating this complication.
• This procedural modification enhances the safety profile of IVC filter placement.