FILTER ELEMENT FOR EMBOLIC PROTECTION DEVICE
First Claim
1. A collapsible filter element for a transcatheter embolic protection device, the filter element comprising:
- a collapsible filter body which is movable between a collapsed stored position for movement through a vascular system, an expanded position for extension across a blood vessel such that blood passing through the blood vessel is delivered through the filter element, and a withdrawal position for assisting in removing the filter body from a patient;
a proximal inlet portion of the filter body having one or more inlet openings sized to allow blood and embolic material enter the filter body; and
a distal outlet portion of the filter body having a plurality of outlet openings sized to allow through-passage of blood, but to retain embolic material within the filter body;
the filter body being at least partially of laminate construction comprising a membrane coated with a coating which is biocompatible, the thickness of the coating being from 4% to 40% of the thickness of the membrane to enhance the mechanical characteristics of the filter body.
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Abstract
A collapsible filter element for a transcatheter embolic protection device comprises a collapsible filter body which is movable between a collapsed stored position for movement through a vascular system and an expanded position for extension across a blood vessel such that blood passing through the blood vessel is delivered through the filter element. A proximal inlet portion of the filter body has one or more inlet openings sized to allow blood and embolic material enter the filter body and a distal outlet portion of the filter body has a plurality of outlet openings sized to allow through-passage of blood, but to retain embolic material within the filter body. The filter body is at least partially of laminate construction comprising a membrane coated with a coating which is biocompatible, the thickness of the coating being from 4% to 40% of the thickness of the membrane. The coating may be of hydrophilic material. To facilitate retrieval of captured embolic material the distal portion and/or an intermediate portion of the filter membrane may be stretchable. The filter body may have regions of varying hardness or stiffness.
148 Citations
53 Claims
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1. A collapsible filter element for a transcatheter embolic protection device, the filter element comprising:
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a collapsible filter body which is movable between a collapsed stored position for movement through a vascular system, an expanded position for extension across a blood vessel such that blood passing through the blood vessel is delivered through the filter element, and a withdrawal position for assisting in removing the filter body from a patient; a proximal inlet portion of the filter body having one or more inlet openings sized to allow blood and embolic material enter the filter body; and a distal outlet portion of the filter body having a plurality of outlet openings sized to allow through-passage of blood, but to retain embolic material within the filter body; the filter body being at least partially of laminate construction comprising a membrane coated with a coating which is biocompatible, the thickness of the coating being from 4% to 40% of the thickness of the membrane to enhance the mechanical characteristics of the filter body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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33. A collapsible filter element for a transcatheter embolic protection device, the filter element comprising:
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a collapsible filter body which is movable between a collapsed stored position for movement through a vascular system and an expanded position for extension across a blood vessel such that blood passing through the blood vessel is delivered through the filter element; a proximal inlet portion of the filter body having one or more inlet openings sized to allow blood and embolic material enter the filter body; a distal outlet portion of the filter body having a plurality of outlet openings sized to allow through-passage of blood, but to retain embolic material within the filter body, wherein the filter body includes a hydrophilic coating. - View Dependent Claims (34, 35, 36, 37, 38, 39)
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Specification