Embolus blood clot filter utilizable with a single delivery system or a single retrieval system in one of a femoral or jugular access
A blood filter delivery system for delivering a filter into a vein from either a femoral or jugular access. The preferred system includes an introducer and a push-rod with a spline member disposed along the push-rod and a pusher member disposed on a distal end. The spline member has a main body, first and second boss portions spaced apart along the longitudinal axis to provide a gap for retaining anchor members of the filter during delivery via the introducer. In an alternative embodiment, a preferred filter includes first and second filter structures diverging in opposite directions. A link is connected to portions of each of the first and second filter structures so that each filter structure can be independently collapsed into a generally cylindrical shape.
1. A blood filter comprising:
a first filter structure comprising at least two first-filter elongated members, each first-filter elongated member having a free end;
a second filter structure comprising at least two second-filter elongated members, each second-filter elongated member having a free end portion;
a juncture structure in between said first and second filter structures;
said first and second filter structures and said juncture structure having a central longitudinal axis;
a first-filter-structure link comprising a first-filter-structure tether and a first longitudinally movable hub wherein the tether connects between a said first-filter elongated member and said first longitudinally movable hub;
a second-filter-structure link comprising a second-filter-structure tether and a second hub wherein the tether connects between a said second-filter elongated member and said second longitudinally movable hub;
wherein each tether connects to a said filter elongated member at a position in between said juncture structure and a said free end portion;
wherein said first and second filter structures are sized and shaped to occupy a patient's blood vessel in a first, deployed configuration in which an outer end of the first-filter elongated members diverges from said longitudinal axis and an outer end of the second-filter elongated members diverges from said longitudinal axis;
wherein said first-filter elongated members and said second-filter elongated members extend in opposite directions from said juncture structure;
wherein said first and second filter structures each have a second collapsed configuration in which the elongated members are collapsed into a generally cylindrical shape;
wherein each said first and second filter structures are independently collapsible to said collapsed configuration that generally aligns said links with said longitudinal axis; and
wherein in said second, collapsed configuration, said longitudinally movable hubs are moved apart in opposite directions and said first-filter and second-filter elongated members and said links align generally with said central, longitudinal axis.
2. The blood filter of claim 1 , wherein there is at least one elongated anchor member at said free end portion.
3. The blood filter of claim 2 , wherein each of the first-filter elongated members connect to a corresponding second-filter elongated member with a wire that includes at least a portion of the first filter structure, said juncture structure, and a second section that includes a portion of the second filter structure.
4. The blood filter of claim 3 , where each first-filter-structure link connects to a first section of each wire.
5. The blood filter of claim 4 , wherein each second-filter-structure link connects to a second section of each wire.
6. The blood filter of claim 3 , further comprising a spline-member attached to said first-filter-structure link and wherein there are multiple said anchor members, each of the anchor members comprises a tubular member having an open end and a hook having a portion disposed in the open end and connected to said first-filter-structure link so that the hook is partially retractable into the open end responsive to movement of the spline member, wherein said first-filter-structure link comprises a plurality of first-filter-structure tethers, each said first-filter-structure tether connected to a said anchor member or hook at one end and to a spline via the first hub at an opposite end.
7. The blood filter of claim 6 , further comprising a boss connected to the first-filter-structure link.
8. The blood filter of claim 6 , wherein said juncture structure includes a third hub disposed about the middle portion of the wires.
9. The blood filter of claim 3 , wherein a said anchor member is disposed at one terminal end of each wire.
10. The blood filter of claim 3 , wherein the wire comprises a material selected from a group comprising shape memory material, super-elastic material, linear-elastic material, metal, alloys, polymers and combinations thereof.
11. The blood filter of claim 3 , further comprising a hook disposed in an end of each of the anchor members and connected to the first-filter-structure link so that the hooks are partially retractable.
12. The blood filter of claim 11 wherein the hooks further comprise a curved end and a straight end and the first-filter-structure link connects to the straight end.
13. The blood filter of claim 12 wherein the first-filter-structure link slidably and rotatably connects to the straight end.
14. The blood filter of claim 2 , wherein the anchor member comprises a hook having a material selected from a group comprising shape memory material, super-elastic material, linear-elastic material, metal, alloys, polymers and combinations thereof.
15. The blood filter of claim 14 , wherein the hook comprises a curved configuration in an operative condition and a generally linear configuration in another condition.
16. A delivery catheter sheath and blood filter assembly, including the blood filter of claim 1 , the assembly comprising:
a generally tubular member having a central longitudinal axis and a lumen;
a first end;
an intermediate end section;
a second end, the first end having a plurality of notches formed on an inner surface, and the intermediate section including a grooved boss portion disposed in the tubular member, said blood filter having multiple anchors that each connect with a groove of the grooved boss;
said blood filter contained in said lumen of said tubular member;
a pusher connected to the boss so that axial movement of the pusher distally enables delivery of the filter into the blood vessel of a patient; and
wherein the grooved boss has at least one groove with a cross sectional area that is smaller than at least one cross sectional area of the anchor.
17. The delivery catheter sheath and blood filter assembly of claim 16 , wherein the pusher is coupled to the boss portion, the pusher extending out of an end of the generally tubular member to provide a handle.