Vena cava filter

  • US 5,836,969 A
  • Filed: 07/28/1997
  • Issued: 11/17/1998
  • Est. Priority Date: 10/01/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. A vascular filter for placement in a blood vessel for preventing the movement of emboli in the blood stream of a human, the filter including a set of filter-wires that diverge from a central region in a generally upstream direction along the blood vessel when implanted forming an emboli-capturing array, the filter wires having portions that engage the vessel wall, and an anchoring assembly defined by at least one set of struts joined centrally with said set of filter-wires, portions of said anchoring assembly constructed and arranged to engage the wall of said blood vessel in a manner anchoring said filter in position, the region of said anchoring being spaced downstream from the region of contact of said set of filter wires with said vessel wall, wherein said anchoring assembly comprises anchoring formations distributed about said filter, said anchoring formations being mounted on parallelogram-like supports arranged to adapt to the walls of vessels over a range of sizes while maintaining substantially the same attitude with respect to the wall of the vessel.

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