Percutaneous anti-migration vena cava filter

A filter device for positioning within a blood vessel, to be utilized for entrapment of blood clots, said filter comprising;

• an apical head;
• a plurality of divergent legs each secured at one of its ends to said head and each having securement means on its distal end with respect to said head;
• each of said legs having a first outwardly directed curvature therein, closely distally adjacent said head, so that the distal remainder of said legs define a generically conical configuration and also to minimize the strain in said legs permitting the filter to be stored in a collapsed state, yet have enough elastic recoil to permit it to expand toward its uncollapsed configuration to allow penetration of a vessel wall upon ejection of the filter therein;
• said first outwardly directed bend extending in said legs through an arc of about 0.5 inches;
• said first outwardly directed bend having a radius of curvature of about 1.4 inches;
• said leg having a second outwardly directed curvature extending through an arc of about 1 inch.

A filter device positionable within a blood vessel for trapping blood clots, comprising:

• a apical head;
• a plurality of divergent legs each secured at one of its ends to said head and each having securement means on its distal end with respect to said head, said head and said legs having a longitudinally directed center line therewithin;
• said head having a cylindrical bore in axial alignment with said center line of said filter adaptable to receive a guidewire for alignment and guidance of said filter upon ejection thereof into a vessel;
• said cylindrical bore having a counterbore disposed in each longitudinal end thereof to facilitate emplacement of a guidewire therewith;
• said divergent legs having a first radially outwardly directed radius of curvature of about 1.4 inches over an arc of about 0.5 inches in length immediately adjacent said head to permit establishment of a conical geometric configuration to the plurality of legs extending from said apical head.