Filter apparatus for blood clots

Claim 1

Filtering device useful for partly interrupting the inferior vena cava and for creating an efficient barrier against embolic migration comprising in an expanded operating condition, a filiform body (1), - extended at one of its ends by a first filter constituted by a plurality of flexible wires (2), of identical length and configuration, starting from said end and diverging in extension from said body, said wires being regularly circumferentially spaced apart one with respect to the other, so as to form a cone of revolution, widened and open at its base, the free end of each wire being bent outwardly to form a fastening tip (3), - the other end of said body (1) ending in a stabilizer which also acts as second filter, and is constituted of a plurality of flexible wires (4) of identical length and configuration, starting from said other end, and which are first bent over around said body and diverging with respect thereto, said wires being regularly circumferentially spaced apart one from the other and being, moreover, offset of a certain angle with respect to the wires constituting the first filter, in order to form a second cone of revolution widened and open at its base, the free end (5) of each wire being slightly bent inwardly to prevent any fastening and an eyelet (6) being also provided at said other end of the body (1) for threading through a silk thread for positioning the filtering device inside the vein and optionally recovering it should the device be ill inserted and in that in the collapsed state, the wires (4) of the filter-stabilizer, in order to be housed in a cathether, are resiliently bent against the body (1) and the wires (2) of the first filter are resiliently bent over the axis extending from said body (1).