Possibly absorbable blood filter
First Claim
Patent Images
1. A blood filter comprising:
- a wire formed in a zigzag configuration includingan endless series of straight sections being joined by bends at opposite ends to form, upon expansion in a blood vessel, a cylindrical, open tubular wall;
and separate filtering means connected to the tubular wall, and extending therein, to cover at least one end of the tubular wall for filtering encountered blood clots.
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Abstract
The invention relates to an implantable blood filter comprising a self-expanding external structure made from a zigzagged thread wound on itself in order to exhibit a closed configuration. A central strainer section is connected to the said thread at various points for the retention of possible blood clots. This strainer section may be made from a biologically absorbable material. Applications include the production of medical blood filters, which are self-centering and absorbable.
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Citations
19 Claims
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1. A blood filter comprising:
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a wire formed in a zigzag configuration including an endless series of straight sections being joined by bends at opposite ends to form, upon expansion in a blood vessel, a cylindrical, open tubular wall; and separate filtering means connected to the tubular wall, and extending therein, to cover at least one end of the tubular wall for filtering encountered blood clots. - View Dependent Claims (2, 3, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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4. A blood filter comprising:
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a flexible wire formed in a zigzag configuration including an endless series of straight sections being joined by bends at opposite ends to form, upon expansion in a blood vessel, a cylindrical, open tubular wall; separate filtering means connected to the tubular wall, and extending therein, to cover at least one end of the tubular wall for filtering encountered blood clots; and retaining means extending from the wire and adapted to penetrate the blood vessel for anchoring the filter within the vessel. - View Dependent Claims (8)
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19. A blood filter device comprising:
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an axially disposed tubular wall having openings therein; first and second transverse ends defining axial limits of the wall; the tubular wall formed from at least one wire having a zigzag configuration; separate filtering means connected to the wall and extending therein to cover at least one of the transverse ends for trapping blood clots; the filter device being sufficiently flexible to allow size reducing radial contraction thereof, relative to a central axis, to facilitate insertion of the filter into a blood vessel; the filter device further being sufficiently resilient to cause radial expansion thereof within the blood vessel, the expansion limited by restraining contact of the tubular wall by a vessel.
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Specification