Removable embolus blood clot filter
First Claim
1. A blood clot filter having a central longitudinal axis and which is collapsible into a collapsed configuration toward said longitudinal axis for insertion into a blood vessel and which is radially expandable outwardly from said longitudinal axis to an expanded configuration for contact with an inner wall of said blood vessel, said blood clot filter having leading and trailing ends and comprising:
- a plurality of elongate, spaced legs which are tubular in configuration and have first and second ends, the first ends of said elongate spaced legs being mounted adjacent to said longitudinal axis and said plurality of elongate spaced legs being formed to extend outwardly away from said longitudinal axis to the second ends thereof which are spaced outwardly from the longitudinal axis in the expanded configuration of said filter,one or more of said plurality of elongate spaced legs having an outwardly curved hook terminating at a point at the second end thereof to engage and penetrate the vessel inner wall in the expanded configuration of said filter, said curved hook having an elongate shaft which is telescopically received in said elongate leg, the shaft being movable relative to said elongate leg to draw said hook into the elongate leg and straighten the hook, the entire cross sectional area along the length of the hook being of reduced size relative to the cross sectional area of the elongate leg, to permit said hook to bend toward a straightened configuration parallel to said elongate leg in response to force applied to remove said hook from the vessel inner wall, andan actuator mounted on said filter and connected to said shaft for moving the shaft relative to said elongate leg to draw said hook into the elongate leg.
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0 Petitions
Accused Products
Abstract
A blood clot filter which is collapsible toward a central longitudinal axis into a collapsed configuration for insertion into a blood vessel and which is radially expandable outwardly from the longitudinal axis to an expanded configuration for contact with the inner wall of the blood vessel at two longitudinal spaced locations. A first plurality of spaced, elongate arms, in the expanded configuration of the filter, curve outwardly away from the longitudinal axis toward the leading end of the filter to form a first filter basket and to center a hub at the trailing end of the filter within the vessel. A second plurality of spaced elongate legs angle outwardly away from the longitudinal axis toward the leading edge of the filter in the expanded configuration thereof to form a second filter basket opening toward the leading end. To prevent longitudinal movement of the filter, the ends of these legs include hooks, at least a portion of which is of a reduced cross sectional area relative to the cross sectional area of the adjacent leg to permit the hooks to bend and straighten in response to withdrawal force.
326 Citations
19 Claims
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1. A blood clot filter having a central longitudinal axis and which is collapsible into a collapsed configuration toward said longitudinal axis for insertion into a blood vessel and which is radially expandable outwardly from said longitudinal axis to an expanded configuration for contact with an inner wall of said blood vessel, said blood clot filter having leading and trailing ends and comprising:
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a plurality of elongate, spaced legs which are tubular in configuration and have first and second ends, the first ends of said elongate spaced legs being mounted adjacent to said longitudinal axis and said plurality of elongate spaced legs being formed to extend outwardly away from said longitudinal axis to the second ends thereof which are spaced outwardly from the longitudinal axis in the expanded configuration of said filter, one or more of said plurality of elongate spaced legs having an outwardly curved hook terminating at a point at the second end thereof to engage and penetrate the vessel inner wall in the expanded configuration of said filter, said curved hook having an elongate shaft which is telescopically received in said elongate leg, the shaft being movable relative to said elongate leg to draw said hook into the elongate leg and straighten the hook, the entire cross sectional area along the length of the hook being of reduced size relative to the cross sectional area of the elongate leg, to permit said hook to bend toward a straightened configuration parallel to said elongate leg in response to force applied to remove said hook from the vessel inner wall, and an actuator mounted on said filter and connected to said shaft for moving the shaft relative to said elongate leg to draw said hook into the elongate leg. - View Dependent Claims (2, 3, 4)
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5. A blood clot filter having a central longitudinal axis and which is collapsible into a collapsed configuration toward said longitudinal axis for insertion into a blood vessel and which is radially expandable outwardly from said longitudinal axis to an expanded configuration for contact with an inner wall of said blood vessel, said blood clot filter having leading and trailing ends and comprising:
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a plurality of elongate, spaced legs having first and second ends with the first ends of said elongate spaced legs being mounted adjacent to said longitudinal axis and each of said legs being formed to extend outwardly away from said longitudinal axis to the second ends thereof which are spaced outwardly from said longitudinal axis in the expanded configuration of said filter, one or more of said plurality of elongate spaced legs is tubular in configuration and has an outwardly curved hook terminating at a point at the second end thereof to engage and penetrate the vessel inner wall in the expanded configuration of said filter, said curved hook having an elongate shaft which is telescopically received in said elongate leg, the entire cross sectional area along the length of the hook being of reduced size relative to the cross sectional area of the elongate leg to permit said hook to bend toward a straightened configuration parallel to said elongate leg in response to force applied to remove said hook from the vessel inner wall, and a plurality of spaced, elongate arms having first and second ends, said first ends of said arms being mounted adjacent to said longitudinal axis, said elongate spaced arms in the expanded configuration of said filter each extending angularly outward away from the longitudinal axis to an elbow spaced between the first and second ends of each said elongate arm and then angularly away from said elbow to the second end of said elongate arm, said elongate spaced legs extending toward the leading end of said filter to form a first filter basket and each said elongate arm angles outwardly from the longitudinal axis of said filter toward the leading end of said filter and then angles away from the elbow toward the leading end of said filter to form a second filter basket. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A blood clot filter having a central longitudinal axis and which is collapsible into a collapsed configuration toward said longitudinal axis for insertion into a blood vessel and which is radially expandable outwardly from said longitudinal axis to an expanded configuration for contact with an inner wall of said blood vessel, said blood clot filter having leading and trailing ends and comprising:
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a plurality of elongate spaced legs having first and second ends, the first ends of said elongate spaced legs being mounted adjacent to said longitudinal axis and said plurality of elongate, spaced legs being formed to extend angularly outwardly away from said longitudinal axis toward the leading end of said filter to second ends of said elongate, spaced legs which are spaced outwardly from said longitudinal axis in the expanded configuration of said filter, and a plurality of spaced, elongate arms having first and second ends, said first ends of said spaced, elongate arms being mounted adjacent to said longitudinal axis, each of said spaced, elongate arms in the expanded configuration of said filter being formed to extend angularly outwardly away from the longitudinal axis of said filter toward the leading end of said filter to a shoulder spaced between said first and second ends of said elongate arm and then angularly inwardly from said shoulder in the direction of the longitudinal axis of said filter toward the filter leading end to the second end of the said elongate arm. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification