Distal embolic protection devices with a variable thickness microguidewire and methods for their use
First Claim
1. A distal embolic protection device for filtering thrombo-embolic material, debris or clots released during percutaneous neurovascular interventional procedures specifically performed in cerebral arterial blood vessels of a human, not attached to a balloon or a stent, and comprising:
- a variable thickness microguidewire comprising a thinner segment bordered by thicker segments,wherein said thinner segment is about 0.008 to 0.010 inch in thickness and has a length,wherein the thicker segments are no more than about 0.017 inch in thickness,a filtering device movable between an expanded configuration and a collapsed configuration, the filtering device configured to be deployed beyond an area of blockage or clot in a cerebral arterial blood vessel, the filtering device configured to be tracked uncovered through a microcatheter having an inner diameter of 0.017 inches from a proximal end of the microcatheter to a distal end of the microcatheter, the filtering device comprising;
an expansion assembly,a filter membrane, andtwo mobile attachment points, one of the mobile attachment points on each end of the filtering device, the mobile attachment points each having a length that covers a portion of the length of the thinner segment of the microguidewire, the lengths of the mobile attachment points together being less than the length of the thinner segment of the microguidewire,a first coil between one of the mobile attachment points and one of the thicker segments;
a second coil between the other of the mobile attachment points and the other of the thicker segments;
wherein the thinner segment of the microguidewire where the filtering device is mounted comprises a core microguidewire, andwherein each of the thicker segments of the microguidewire comprises the core microguidewire coated by a flexible hypotube,wherein the filtering device is rotatably mounted on the thinner segment of the variable thickness microguidewire between the thicker segments via the mobile attachment points, the filtering device rotationally and longitudinally displaceable relative to and independently of the microguidewire,wherein the thickness of the distal embolic protection device in the collapsed configuration measures no more than about 0.017 inch,wherein the length of the thinner segment of the variable thickness microguidewire is longer than a length of the filtering device in the collapsed configuration,wherein the filtering device is configured to float along the length of the thinner segment of the variable thickness microguidewire.
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Accused Products
Abstract
A distal embolic protection device for dedicated use in cerebral arterial blood vessels is described. The distal embolic protection device comprises a variable-thickness micro-guidewire and a collapsible filtering device mounted on the microguidewire over two mobile attachment points so that in its collapsed configuration, the thickness of the microguidewire and the filtering device at this region is less than or equal to 0.017 inch (0.432 mm) in thickness to be able to pass through existing conventional microcatheters. The mobile attachment points allow for rotatory and longitudinal mobility of the microguidewire while the filtering device is stable thereby decreasing the risk of trauma to the fragile cerebral arterial blood vessels. Preferably, the filtering device comprises an expansion assembly, e.g., a plurality of struts attached to a filter membrane that are in a folded position which self expand to the desired dimensions within the cerebral blood vessels. Also described are methods of using the distal embolic protection devices of this invention.
558 Citations
41 Claims
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1. A distal embolic protection device for filtering thrombo-embolic material, debris or clots released during percutaneous neurovascular interventional procedures specifically performed in cerebral arterial blood vessels of a human, not attached to a balloon or a stent, and comprising:
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a variable thickness microguidewire comprising a thinner segment bordered by thicker segments, wherein said thinner segment is about 0.008 to 0.010 inch in thickness and has a length, wherein the thicker segments are no more than about 0.017 inch in thickness, a filtering device movable between an expanded configuration and a collapsed configuration, the filtering device configured to be deployed beyond an area of blockage or clot in a cerebral arterial blood vessel, the filtering device configured to be tracked uncovered through a microcatheter having an inner diameter of 0.017 inches from a proximal end of the microcatheter to a distal end of the microcatheter, the filtering device comprising; an expansion assembly, a filter membrane, and two mobile attachment points, one of the mobile attachment points on each end of the filtering device, the mobile attachment points each having a length that covers a portion of the length of the thinner segment of the microguidewire, the lengths of the mobile attachment points together being less than the length of the thinner segment of the microguidewire, a first coil between one of the mobile attachment points and one of the thicker segments; a second coil between the other of the mobile attachment points and the other of the thicker segments; wherein the thinner segment of the microguidewire where the filtering device is mounted comprises a core microguidewire, and wherein each of the thicker segments of the microguidewire comprises the core microguidewire coated by a flexible hypotube, wherein the filtering device is rotatably mounted on the thinner segment of the variable thickness microguidewire between the thicker segments via the mobile attachment points, the filtering device rotationally and longitudinally displaceable relative to and independently of the microguidewire, wherein the thickness of the distal embolic protection device in the collapsed configuration measures no more than about 0.017 inch, wherein the length of the thinner segment of the variable thickness microguidewire is longer than a length of the filtering device in the collapsed configuration, wherein the filtering device is configured to float along the length of the thinner segment of the variable thickness microguidewire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 19, 20, 21, 22, 23, 24, 25, 26)
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15. A distal embolic protection device for filtering thrombo-embolic material, debris or clots released during percutaneous neurovascular interventional procedures specifically performed in cerebral arterial blood vessels, not attached to a balloon or a stent, and comprising:
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a variable thickness microguidewire comprising; a thinner segment having a thickness of about 0.008 to 0.010 inch, a first thicker segment distal to the thinner segment, the first thicker segment coated with a distal hypotube, a second thicker segment proximal to the thinner segment, the second thicker segment coated with a proximal hypotube, and a shapeable distal tip, a filtering device movable between an expanded configuration and a collapsed configuration, the filtering device configured to be deployed beyond an area of blockage or clot in a cerebral arterial blood vessel, the filtering device configured to be tracked uncovered through a microcatheter having an inner diameter of 0.017 inches from a proximal end of the microcatheter to a distal end of the microcatheter, the filtering device comprising; an expansion assembly, a filter membrane, a distal mobile attachment point on a distal end of the filtering device, and a proximal mobile attachment point on a proximal end of the filtering device, wherein the expansion assembly is attached to both the proximal and distal mobile attachment points, and wherein the filter membrane is attached to at least the distal mobile attachment point, wherein the filtering device is rotatably mounted on the thinner segment of the variable thickness microguidewire between the first thicker segment and the second thicker segment via the proximal and distal mobile attachment points, the filtering device rotationally and longitudinally displaceable relative to and independently of the microguidewire, wherein the thickness of the distal embolic protection device in the collapsed configuration measures no more than about 0.017 inch, wherein the variable thickness microguidewire is configured to float along the thinner segment of the variable thickness microguidewire, and wherein the shapeable tip of the microguidewire, the expansion assembly and the filter membrane all comprise a radio-opaque material, metal or alloy. - View Dependent Claims (16, 27, 28)
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17. A distal embolic protection device, not attached to a balloon or a stent, for filtering thrombo-embolic material, debris or clots released during percutaneous neurovascular interventional procedures specifically performed in cerebral arterial blood vessels of a human, and comprising:
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a core microguidewire having a diameter of about 0.008 to 0.010 inch, a filtering device movable between an expanded configuration and a collapsed configuration, the filtering device configured to be deployed beyond an area of blockage or clot in a cerebral arterial blood vessel, the filtering device configured to be tracked through a microcatheter having an inner diameter of 0.017 inches uncovered, the filtering device comprising; an expansion assembly, a filter membrane, and a proximal mobile attachment point on a proximal end of the filtering device, and a distal mobile attachment point on a distal end of the filtering device, wherein a first portion of the microguidewire is coated with a proximal flexible hypotube and a second portion of the microguidewire is coated with a distal flexible hypotube, the first portion longitudinally spaced from the second portion, the coated portions being no more than about 0.017 inch thick, and wherein the filtering device is rotatably mounted on the microguidewire between the hypotubes via the mobile attachment points, such that the filtering device may be rotationally and longitudinally displaced relative to and independently of the microguidewire and hypotubes, wherein the thickness of the distal embolic protection device in the collapsed configuration measures no more than about 0.017 inch, wherein a length of the microguidewire not covered by the hypotubes is longer than a length of the filtering device in the collapsed configuration. - View Dependent Claims (18, 29, 30)
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31. A distal embolic protection device comprising:
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a core wire having a diameter of about 0.008 to 0.010 inch, at least a portion of the core wire comprising a thinner segment; a proximal hypotube coating around the core wire and proximal to the thinner segment; a distal hypotube coating around the core wire and distal to the thinner segment, wherein at least one of the proximal coating and the distal coating comprises a coil; a filtering device around the thinner segment and between the proximal hypotube coating and the distal hypotube coating, the filtering device rotatably and longitudinally movable relative to the thinner segment, the filtering device transformable between a collapsed configuration and an expanded configuration, the filtering device having a thickness of no more than about 0.017 inches in the collapsed configuration, the filtering device comprising; a proximal attachment point, a distal attachment point, a plurality of struts between the proximal attachment point and the distal attachment point, and a porous filter membrane coupled to the plurality of struts. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification