Embolic protection device
First Claim
1. A vascular filtration device for removing embolic material in body fluid, said device comprising:
- a delivery system having a longitudinal axis, distal and proximal portions, said distal portion of the delivery system being removably advanceable into the vasculature of a patient;
a collapsible filter body having a longitudinal axis, a proximity tapering proximal end and a distal end, and further having a collapsed configuration and an expanded deployed configuration, the collapsed configuration permitting delivery and withdrawal of the filter body from the vasculature of a patient;
the filter body defining an interior space when in said expanded configuration;
at least one fluid inlet on the proximal end of the filter body, the inlet being open to admit blood and embolic material into said interior space when the filter body is in the expanded configuration, and substantially closed to fluid flow when the filter body is in the collapsed configuration;
a plurality of outlet openings at the distal end of the filter body, the outlet openings being open to fluid flow from said interior space when the filter body is in the expanded configuration;
the outlet openings being sized to allow through passage of blood but retaining undesired embolic material within the filter body;
wherein the filter body is moved between the collapsed and expanded configurations through relative motion of portions of the filter delivery system with respect to the filter body;
said proximal end of the filter body being collapsible on transition to the collapsed configuration thereby firstly substantially closing said at least one fluid inlet to ensure retention of any collected embolic material in the interior space and then collapsing the remainder of the filter body; and
the delivery system includes a guidewire, and the filter body is rotatable relative to the delivery system.
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Accused Products
Abstract
An embolic protection device has a collapsible filter element (105) mounted on a carrier such as a guidewire (101). The filter element (105) collapses into the outer end of a catheter (118) for deployment and retrieval through a vascular system of a patient. The filter element (105) has a collapsible filter body with a proximal inlet end and a distal outlet end. The proximal inlet end has inlet openings sized to allow blood and embolic material enter the filter body. The outlet end has outlet openings which allow through passage of blood but retain embolic material within the filter body. After use, the catheter (118) is movable along the guidewire (101) to engage the proximal end of the filter element and close the inlet openings before sliding over the filter element from the proximal end to the distal end to progressively collapse the filter body on the guidewire (101) for retrieval. The filter element (105) may conveniently be mounted on a tubular sleeve (104) which is slidable and rotatable on the guidewire (101) between spaced-apart stops (106, 120) on the guidewire (101) which allows some manipulation of the guidewire independently of the filter when the filter is in use.
981 Citations
38 Claims
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1. A vascular filtration device for removing embolic material in body fluid, said device comprising:
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a delivery system having a longitudinal axis, distal and proximal portions, said distal portion of the delivery system being removably advanceable into the vasculature of a patient;
a collapsible filter body having a longitudinal axis, a proximity tapering proximal end and a distal end, and further having a collapsed configuration and an expanded deployed configuration, the collapsed configuration permitting delivery and withdrawal of the filter body from the vasculature of a patient;
the filter body defining an interior space when in said expanded configuration;
at least one fluid inlet on the proximal end of the filter body, the inlet being open to admit blood and embolic material into said interior space when the filter body is in the expanded configuration, and substantially closed to fluid flow when the filter body is in the collapsed configuration;
a plurality of outlet openings at the distal end of the filter body, the outlet openings being open to fluid flow from said interior space when the filter body is in the expanded configuration;
the outlet openings being sized to allow through passage of blood but retaining undesired embolic material within the filter body;
wherein the filter body is moved between the collapsed and expanded configurations through relative motion of portions of the filter delivery system with respect to the filter body;
said proximal end of the filter body being collapsible on transition to the collapsed configuration thereby firstly substantially closing said at least one fluid inlet to ensure retention of any collected embolic material in the interior space and then collapsing the remainder of the filter body; and
the delivery system includes a guidewire, and the filter body is rotatable relative to the delivery system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14)
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11. A method for the capture and removal of embolic material from a blood vessel during an interventional procedure comprising the steps of:
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preparing an embolic protection device comprising a guidewire having a proximal end and a distal end, a collapsible filter body mounted adjacent the distal end of the guidewire, the filter body having a proximally tapering proximal end and a distal end and being movable between a collapsed stored position against the guidewire and an expanded position extending laterally outwardly of the guidewire;
sliding a catheter along the guidewire and over the filter body from a proximal inlet end of the filter to collapse and house the filter in a distal end of the catheter;
introducing the distal end of the catheter into the vascular system of a patient;
positioning the distal end at a desired location in the blood vessel;
holding the guidewire and retracting the catheter to release the filter body from the catheter into the expanded position;
filtering blood in the vessel during the interventional procedure;
after the interventional procedure, advancing a retrieval catheter along the guidewire to engage a proximal inlet end of the filter collapsing the filter into the distal end of the cather by firstly substantially closing an inlet to the filter body to ensure retention of any collected embolic material in an interior space of the filter body and then collapsing the remainder of the filter body; and
withdrawing the cather from the patient. - View Dependent Claims (36, 37, 38)
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15. A vascular filtration device for removing embolic material in body fluid, said device comprising:
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a delivery system having a longitudinally axis, distal and proximal portions, said distal portion of the delivery system being removably advanceable into the vasculature of a patient;
a collapsible filter body having a longitudinal axis, a proximally tapering proximal end and a distal end, and further having a collapsed configuration and an expanded deployed configuration, the collapsed configuration permitting delivery and withdrawal of the filter body from the vasculature of a patient;
the filter body defining an interior space when in said expanded configuration;
at least one fluid inlet on the proximal end of the filter body, the inlet being open to admit blood and embolic material into said interior space when the filter body is in the expanded configuration;
a plurality of outlet openings at the distal end of the filter body, the outlet openings being open to fluid flow from said interior space when the filter body is in the expanded configuration;
the outlet openings being sized to allow through passage of blood but retaining undesired embolic material within the filter body;
wherein the filter body is moved between the collapsed and expanded configurations through relative motion of portions of the filter delivery system with respect to the filter body;
said proximal end of the filter body being collapsible on transition to the collapsed configuration thereby firstly substantially closing said at least one fluid inlet to ensure retention of any collected embolic material in the interior space and then collapsing the remainder of the filter body; and
the filter delivery system includes a guidewire and the filter body is detached from the delivery system so as to permit longitudinal movement of the filter body relative to the delivery system when the filter body is in the expanded deployed configuration. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A vascular filtration device for removing embolic material in body fluid, said device comprising:
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a delivery system having a longitudinal axis, distal and proximal portions, said distal portion of the delivery system being removably advanceable into the vasculature of a patient;
a collapsible filter body having a longitudinal axis, proximal and distal ends and further having a collapsed configuration and an expanded deployed configuration, the collapsed configuration permitting delivery and withdrawal of the filter body from the vasculature of a patient;
the filter body defining an interior space when in said expanded configuration;
at least one fluid inlet on the proximal end of the filter body, the inlet being open to admit blood and embolic material into said interior space when the filter body is in the expanded configuration, and substantially closed to fluid flow when the filter body is in the collapsed configuration;
a plurality of outlet openings at the distal end of the filter body, the outlet openings being open to fluid flow from said interior space when the filter body is in the expanded configuration;
the outlet openings being sized to allow through passage of blood but retaining undesired embolic material within the filter body;
wherein the filter body is moved between the collapsed and expanded configurations through relative motion of portions of the filter delivery system with respect to the filter body; and
wherein the filter body has a generally circular transverse cross sections along its length forming an associated outer surface, and at least one of a protruding rib and recessed groove disposed about said associated outer surface. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35)
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Specification