Blood clots filtering device

Claim 1

A filtering device useful for partly interrupting the interior vena cava and for creating an efficient barrier against embolic migration, wherein in as expanded operating condition, said device comprises: a filiform body, extended at one of its ends by a first filter constituted by a plurality of flexible wires 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; a filter-stabilizer located at the other end of said body and constituted of a plurality of flexible wires 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 by 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 of each wire being slightly bent inwardly to prevent any fastening; and an eyelet being also provided at said other end of the body for threading a thread therethrough for positioning the filtering device; whereas in the collapsed state, the wires of the filter-stabilizer, in order to be housed in a catheter, are resiliently bent against said body and the wires of the first filter are resiliently bent over the axis extending from said body.

Claim 7

A system comprising: a filtering device, wherein in an expanded operating condition, said filtering device comprises: a filiform body, extended at one of its ends by a first filter constituted by a plurality of flexible wires 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; a filter-stabilizer located at the other end of said body and constituted of a plurality of flexible wires 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 by 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 of each wire being slightly bent inwardly to prevent any fastening; and an eyelet being also provided at said other end of the body for threading a thread therethrough for positioning the filtering device; whereas in the collapsed state, the wires of the filter-stabilizer, in order to be housing in a catheter, are resiliently bent against said body and the wires of the first filter are resiliently bent over the axis extending from said body; a catheter for housing said filtering device in collapsed condition; a canula housed in said catheter; and a thread which extends through said catheter and passes through said eyelet of said filtering device so as to form two strands, the free ends of which emerge from the catheter, said canula being connectable to the catheter.

Claim 8

A system comprising: a filtering device, wherein in an expanded operating condition, said filtering device comprises: a filiform body, extended at one of its ends by a first filter constituted by a plurality of flexible wires 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; a filter-stabilizer located at the other end of said body and constituted of a plurality of flexible wires 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 by 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 of each wire being slightly bent inwardly to prevent any fastening; and an eyelet being also provided at said other end of the body for threading a thread therethrough for positioning the filtering device; whereas in the collapsed state, the wires of the filter-stabilizer, in order to be housing in a catheter, are resiliently bent against said body and the wires of the first filter are resiliently bent over the axis extending from said body; a catheter for housing said filtering device in collapsed condition; a canula housed in said catheter; and a thread which extends through said catheter and passes through said eyelet of said filtering device so as to form two strands, the free ends of which emerge from the catheter, said canula being connectable to the catheter.

Claim 10

A method for causing a partial interruption of the interior vena cava in the treatment of thrombo-embolic disorders, consisting essentially of: providing a system comprising: a filtering device, wherein in an expanded operating condition, said filtering device comprises: a filiform body, extended at one of its ends by a first filter constituted by a plurality of flexible wires 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; a filter-stabilizer located at the other end of said body and constituted of a plurality of flexible wires 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 by 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 of each wire being slightly bent inwardly to prevent any fastening; and an eyelet being also provided at said other end of the body for threading a thread therethrough for positioning the filtering device; whereas in the collapsed state the wires of the filter-stabilizer, in order to be housed in a catheter, are resiliently bent against said body and the wires of the first filter are resiliently bent over the axis extending from said body; introducing the catheter into the jugular vein at the base of the neck; pushing said catheter through the superior vena cava until it reaches a predetermined spot in the inferior vena cava; immbolizing the cannula; progressively removing the catheter to release the first filter which expands inside the vein inner wall; exerting a slight pull on the thread to secure the fastening; and removing the catheter in order to release the filter-stabilizer which expands until its wires are resting against the vein inner wall.

Claim 11

A method for causing a partial interruption of the interior vena cava in the treatment of thrombo-embolic disorders, consisting essentially of: providing a system comprising: a filtering device, wherein in an expanded operating condition, said filtering device comprises: a filiform body, extended at one of its ends by a first filter constituted by a plurality of flexible wires 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; a filter-stabilizer located at the other end of said body and constituted of a plurality of flexible wires 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 by 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 of each wire being slightly bent inwardly to prevent any fastening; and an eyelet being also provided at said other end of the body for threading a thread therethrough for positioning the filtering device; whereas in the collapsed state the wires of the filter-stabilizer, in order to be housed in a catheter, are resiliently bent against said body and the wires of the first filter are resiliently bent over the axis extending from said body; introducing the catheter into the jugular vein at the base of the neck; pushing said catheter through the superior vena cava until it reaches a predetermined spot in the inferior vena cava; immbolizing the cannula; progressively removing the catheter to release the first filter which expands inside the vein inner wall; exerting a slight pull on the thread to secure the fastening; and removing the catheter in order to release the filter-stabilizer which expands until its wires are resting against the vein inner wall.