Clot retrieval devices
First Claim
1. A clot retrieval device comprising:
- an elongate member and a plurality of clot engaging elements at a distal end of the elongate member, the clot engaging elements being self expandable between a retracted delivery configuration and an expanded deployed configuration; and
a plurality of restraining rings, each restraining ring positioned adjacent a clot engaging element of the plurality of clot engaging elements and including a restraining portion having a radially inner surface sized to receive a proximally extending tab of a clot engaging element of the plurality of clot engaging elements for biasing the clot engaging element in a retracted delivery configuration against the elongate member, wherein one restraining ring of the plurality of restraining rings is positioned proximally of each of the plurality of clot engaging elements in both the retracted delivery configuration and the expanded deployed configuration; and
wherein each restraining ring is releasable from an adjacent clot engaging element to allow the clot engaging element to expand into the deployed configuration.
1 Assignment
0 Petitions
Accused Products
Abstract
A self-expandable mechanical clot retrieval device is designed variously to dislodge, engage and retract blood clot from extremely small and tortuous vasculature. The retrieval device comprises an elongate member and a plurality of ring elements. The ring elements may comprise a plurality of struts and crowns interconnected by a tether formed at a distal end of the elongate member or may be a separate component attached thereto. At least one tether may connect each ring element to the elongate member to restrain the ring element in a collapsed configuration during delivery of the retrieval device through an intravascular microcatheter. The tether connecting the ring element to the elongate member disengages when the retrieval device is positioned at the occluded site and the microcatheter is retracted to allow the self-expandable ring elements to reach an expanded configuration.
448 Citations
30 Claims
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1. A clot retrieval device comprising:
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an elongate member and a plurality of clot engaging elements at a distal end of the elongate member, the clot engaging elements being self expandable between a retracted delivery configuration and an expanded deployed configuration; and a plurality of restraining rings, each restraining ring positioned adjacent a clot engaging element of the plurality of clot engaging elements and including a restraining portion having a radially inner surface sized to receive a proximally extending tab of a clot engaging element of the plurality of clot engaging elements for biasing the clot engaging element in a retracted delivery configuration against the elongate member, wherein one restraining ring of the plurality of restraining rings is positioned proximally of each of the plurality of clot engaging elements in both the retracted delivery configuration and the expanded deployed configuration; and wherein each restraining ring is releasable from an adjacent clot engaging element to allow the clot engaging element to expand into the deployed configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A clot retrieval device comprising:
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an elongate member, a first clot engaging element and a second clot engaging element, the first clot engaging element distal of the second clot engaging element, the clot engaging elements being self expandable and having a sheathed delivery configuration, a deployed configuration, and a fully expanded configuration; and at least one restraining ring having a restraining portion with a radially inner surface sized to receive a tab extending proximally from the first clot engaging element for biasing the first clot engaging element in the deployed configuration, wherein the radially inner surface abuts the tab in the deployed configuration; wherein activation of the at least one restraining ring allows the first clot engaging element to expand into the fully expanded configuration. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A clot retrieval device comprising:
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an elongate member and at least one clot engaging element at a distal end of the elongate member, the clot engaging element being self expandable between a retracted delivery configuration, a deployed configuration, and a fully expanded configuration; and a restraining ring including a restraining portion having a radially inner surface sized to receive a tab extending from the clot engaging element when the clot engaging element is in the retracted delivery configuration, and wherein the radially inner surface abuts the tab in the retracted delivery configuration, wherein the restraining ring includes at least one collar movable relative to the clot engaging element; and
wherein proximal movement of the restraining ring allows the at least one clot engaging element to expand from the deployed configuration to the fully expanded configuration. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification