Magnetically retrievable vena cava filter and retrieval device therefor

摘要

The disclosure pertains to magnetically retrievable vena cava filters having a low torque associated therewith when subjected to a strong external magnetic field and retrieval devices therefor. The vena cava filter may include a magnetically permeable sphere or a spherical dipole magnet located within the spherical cavity of the apical hub wherein the spherical dipole magnet is free to rotate about any of three mutually orthogonal axes. The retrieval device is capable of substantially containing the vena cava filter in a collapsed state and includes a magnetically active member capable of interacting with the vena cava filter. The retrieval device may optionally include a supplemental mechanical latch.