This was the first nitinol filter on the market. It has a similar design to the G2 with a lower level of anchoring legs and an upper level for capturing clots.  The main difference is that the upper level is composed of loops of wire rather than struts.     'A brief history...

This filter is available in stainless steel or titanium variations. It is designed to reduce the tilting problems identified with the Titanium Greenfield model by using over-the-wire insertion. It also uses an alternating hook arrangement that has been shown to reduce tilt and migration. One...

This has a novel design with two nitinol spiral elements crimped at the ends to form a symmetric double-looped helical structure. A filter mesh designed to capture clots is attached to one loop.     'A brief history of inferior vena cava filters and analysis of current devices' -...

This is an updated version of the recovery filter. This nitinol (nickel-titanium alloy) filter has a conical shape with 6 legs and 6 filter wires arranged in 2 offset layers. It has elastic fixation hooks designed to allow easier removal. Maximum caval diameter for insertion is 28mm and it...

This nitinol filter has a non-tilt spiral shape, designed to be self-centering. It is anchored by an oversized double ring platform rather than by hooks or struts. This requires that the filter be sized to the caval diameter.     'A brief history of inferior vena cava filters and...