Which IVC filter is described as 'looks like the wires of an umbrella while still folded'?

Which IVC filter is described as 'looks like the wires of an umbrella while still folded'?

• A. VenaTech
• B. Greenfield
• C. Gunther-Tulip
• D. Birds Nest

Answer: (A)

Understanding how IVC filters are built helps you recognize the description. Many filters start as a compact wire frame inside the delivery catheter and unfold into a cage that traps clots. The description “looks like the wires of an umbrella while still folded” points to a collapsed frame that resembles umbrella ribs before deployment. The VenaTech filter uses a slender wire arrangement that, in its folded delivery state, presents an umbrella-like silhouette. When released, those wires unfold to form the stabilizing multiwire cage that sits in the IVC. By comparison, the Bird’s Nest filter is known for its woven, nest-like mesh when expanded, not umbrella ribs; the Gunther-Tulip expands into a tulip- or flower-shaped configuration; Greenfield has a conical, umbrella-like appearance when deployed but isn’t described by folded-wire umbrella ribs in the same way as this device.

Understanding how IVC filters are built helps you recognize the description. Many filters start as a compact wire frame inside the delivery catheter and unfold into a cage that traps clots. The description “looks like the wires of an umbrella while still folded” points to a collapsed frame that resembles umbrella ribs before deployment. The VenaTech filter uses a slender wire arrangement that, in its folded delivery state, presents an umbrella-like silhouette. When released, those wires unfold to form the stabilizing multiwire cage that sits in the IVC.

By comparison, the Bird’s Nest filter is known for its woven, nest-like mesh when expanded, not umbrella ribs; the Gunther-Tulip expands into a tulip- or flower-shaped configuration; Greenfield has a conical, umbrella-like appearance when deployed but isn’t described by folded-wire umbrella ribs in the same way as this device.