Removable embolus blood clot filter
First Claim
1. A blood vessel filter, comprising:
- a hub disposed along a longitudinal axis;
a plurality of locator members projecting from the hub, a proximal end of each of the locator members attached to the hub, the locator members bounded by a first compound surface of revolution about the longitudinal axis, the first compound surface of revolution including a first frustum distal of the hub having a first volume, and a second frustum distal of the first frustum having a second volume greater than the first volume;
anda plurality of anchor members projecting from the hub, a proximal end of each of the anchor members attached to the hub, the anchor members bounded by a second compound surface of revolution about the longitudinal axis, the second compound surface of revolution including a third frustum and a fourth frustum distal of the third frustum,whereinone of the plurality of locator members has a proximal segment, a first segment, a second segment that extends along a second angle of about 20 degrees with respect to the longitudinal axis;
anda tip segment that extends along a third angle of less than about 1 degree with respect to the longitudinal axis.
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Accused Products
Abstract
A removable blood clot filter includes a number of locator members and anchor members disposed radially and extending angularly downward from a hub. The locator members include a number of linear portions having distinct axes configured to place a tip portion approximately parallel to the walls of a blood vessel when implanted and to apply sufficient force to the vessel walls to position the filter near the vessel centerline. The anchor members each include a hook configured to penetrate the vessel wall to prevent longitudinal movement due to blood flow. The hooks may have a cross section sized to allow for a larger radius of curvature under strain so that the filter can be removed without damaging the vessel wall.
637 Citations
15 Claims
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1. A blood vessel filter, comprising:
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a hub disposed along a longitudinal axis; a plurality of locator members projecting from the hub, a proximal end of each of the locator members attached to the hub, the locator members bounded by a first compound surface of revolution about the longitudinal axis, the first compound surface of revolution including a first frustum distal of the hub having a first volume, and a second frustum distal of the first frustum having a second volume greater than the first volume; and a plurality of anchor members projecting from the hub, a proximal end of each of the anchor members attached to the hub, the anchor members bounded by a second compound surface of revolution about the longitudinal axis, the second compound surface of revolution including a third frustum and a fourth frustum distal of the third frustum, wherein one of the plurality of locator members has a proximal segment, a first segment, a second segment that extends along a second angle of about 20 degrees with respect to the longitudinal axis; and a tip segment that extends along a third angle of less than about 1 degree with respect to the longitudinal axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A blood vessel filter, comprising:
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a hub disposed along a longitudinal axis;
a plurality of anchor members projecting from the hub, each anchor member including a hook configured to penetrate a blood vessel wall, the hook spaced a first radial distance from the longitudinal axis;and a plurality of locator members projecting from the hub, each locator member including a tip segment spaced a second radial distance from the longitudinal axis less than the first radial distance, each locator member including a first linear segment defining a first angle with respect to the longitudinal axis and a second linear segment extending from the first linear segment, the second linear segment defining a second angle with respect to the longitudinal axis different from the first angle, and a linear tip segment extending from the second linear segment, wherein one of the plurality of locator members has a proximal segment, the first linear segment, the second linear segment that extends along the second angle of about 20 degrees with respect to the longitudinal axis; and the linear tip segment that extends along a third angle of less than about 1 degree with respect to the longitudinal axis. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification