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EP0430848A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

A collapsible filter for introduction in a blood vessel of a patient

Assignee: William Cook Europe ApS
•
Filing: 1990-11-08
•
Granted: —
•
Expires: 2010-11-08
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Abstract

Abstract In a collapsible filter for introduction into a blood vessel of a patient and of the kind comprising a number of legs (1-4) diverging from an apical hub (5) and each having a reversely turned hook (1b-4b) at its distal end with respect to said hub (5), each leg comprises a central element (1a-4a), bent into a smooth quasi-halfsinusoidal form, and two substantially symmetrical curved side elements (1c-4c, 1d-4d) extending on either side of the central element (1a-4a). The filter may as a whole may be unfolded from a collapsed insertion condition in which the central and side elements of all legs (1-4) forms a narrow bundle for arrangement in a catheter like insertion instrument into a tulip like filter configuration with the side elements (1c-4c, 1d-4d) interposed between the central elements (1a-4a) of the legs.

Inventors

  • 👤 Erik Rasmussen
  • 👤 Rolf W. Günther

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-23 00:38
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/01; A61F2/0105; A61F2002/016; A61F2230/00; A61F2230/0002; A61F2230/0028; A61F2230/005; A61F2230/0063; A61F2230/0073; A61F2230/008

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 159 words
A collapsible filter for introduction into a blood vessel of a patient and of the kind comprising a number of legs (1-4) diverging from an apical hub (5) and each having a reversely turned hook (1b-4b) at its distal end with respect to said hub (5), characterized in that each leg comprises a central element (1a-4a), bent into a smooth quasi-halfsinusoidal form, and two substantially symmetrical curved side elements (1c-4c, 1d-4d) extending on either side of the central element, whereby the filter as a whole may be unfolded from a collapsed insertion condition in which the central elements (1a-4a) and side elements (1c-4c, 1d-4d) of all legs forms a narrow bundle for arrangement in a catheter like insertion instrument into a tulip like filter configuration with the side elements (1c-4c, 1d-4d) interposed between the central elements (1a-4a) of the legs (1-4) to assume the shape of an apertured solid of evolution with one pointed end at said hub (5).
Claim 2
Dependent Claim 70 words
A collapsible filter as claimed in claim 1, characterized in that the curved side elements (1c-4c, 1d-4d) of each leg are formed from one piece of wire the ends of which are joined together at the apical hub (5), whereas at the middle of its length said piece of wire forms an eyelet (7-10) surrounding the central element (1a-4a) to be freely slidable along a part of the length thereof.
Claim 3
Dependent Claim 36 words
A collapsible filter as claimed in claim 1 or 2 characterized in that in the collapsed state the side elements (1c-4c, 1d-4d) of each leg extend in subtantially parallel juxtaposed relationship with the central element (1a-4a).
Claim 4
Dependent Claim 54 words
A collapsible filter as claimed in claim 2 characterized in that the side elements (1c-4c, 1d-4d) of each leg have a length and curvature such that in the unfolded state the eyelet (7-10) will be positioned substantially at the inner side of the wall of a vena cava in which the filter is inserted.
Claim 5
Dependent Claim 62 words
Collapsible filter as claimed in any of the preceding claims characterized in that in the unfolded tulip-like configuration of the filter the maximum distance between the two side elements (1c-4c, 1d-4d) of each leg midway between the apical hub (5) and the eyelet (7-10) is of the same order as the distance between neighbouring side elements belonging to two adjacent legs (1-4).

References Cited (Backward Citations)

US4643184A Cited
US4873978A Cited

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