Removable Embolus Blood Clot Filter and Filter Delivery Unit

A filter delivery system, comprising:

• a blood filter including:
• a hub disposed along a longitudinal axis;
• at least one anchor projecting from the hub, the at least one anchor including a hook that penetrates a wall of the blood vessel, the hook being spaced along the longitudinal axis from the hub, and spaced a first radial distance from longitudinal axis;
• and
• at least one locator projecting from the hub having at least a portion proximate a tip that engages the wall of the blood vessel, the tip being spaced along the longitudinal axis from the hub, and spaced a second radial distance from the longitudinal axis, the second radial distance being less than the first radial distance;
• and
• a delivery unit including:
• a first end coupled to a pusher pad via an elongate pusher, the elongate pusher having first, second, and third sections of different cross-sections between the first end and the pusher pad;
• and
• a slotted spline disposed between any two of the first, second, and third sections, the slotted spline having a plurality of grooves extending along the longitudinal axis, the slotted spline having a reduced cross-section proximate the elongate pusher, each of the plurality of grooves receiving a portion of each of the plurality of legs of the filter.