As a explained in a recent article posted here, IVC filters made by Bard and by Cook (major medical device companies) can have serious problems.
There were two models of the IVC filter involved. One was the G2, which was designed to replace an earlier model. Within four months of receiving FDA approval for the device in 2002, Bard began getting reports of adverse events involving fractures and migration. Despite these concerns, Bard chose to continue with the manufacture and sale of the G2, as well as the G2 Express – which was essentially the same device with a slight modification (for an explanation of how that got approved, go here).