Filter, particularly for trapping blood clots
First Claim
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1. A filter to be positioned within a blood vessel to trap blood clots, said filter comprising:
- a plurality of legs arranged to extend from a head in a substantially conical corolla configuration, each of said legs having a free end; and
at least some of said legs having respective appendices connected thereto in the region of said free ends thereof, each appendix including a portion extending in the general direction of said head;
whereby said appendices extend substantially parallel with a wall of the vessel when said filter is inserted within the same.
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Abstract
The invention relates to an improved filter intended to be placed in the blood stream for the trapping of clots.
The filter (10) of the invention is characterised in that it comprises legs (12) provided with appendices (14) which allow centering of the filter inside a vein (6).
The invention is applied to filters intended to be placed in veins with a view to avoiding emboli.
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Citations
16 Claims
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1. A filter to be positioned within a blood vessel to trap blood clots, said filter comprising:
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a plurality of legs arranged to extend from a head in a substantially conical corolla configuration, each of said legs having a free end; and at least some of said legs having respective appendices connected thereto in the region of said free ends thereof, each appendix including a portion extending in the general direction of said head; whereby said appendices extend substantially parallel with a wall of the vessel when said filter is inserted within the same. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15)
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13. The filter of claim 22, wherein said hooking means comprise
two hooks situated on each said appendix.
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16. Method for inserting a filter in a blood vessel, comprising the steps of
inserting a tube containing the filter into the blood vessel, the filter having a plurality of legs extending from a head in a substantially conical corolla configuration, with at least some of the legs having respective appendices connected thereto in the region of free ends thereof, each appendix having a free end extending in the general direction of the head and which is set back with respect to the head; - and
ejecting the filter from the tube within the vessel, whereby the appendices are ejected therefrom prior to total release of the filter, so that the legs having the appendices are the first to bear on an inside wall of the blood vessel, and the filter is substantially positioned along an axis of the blood vessel.
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Specification