Embolic protection device
First Claim
1. An embolic protection device comprising:
- a collapsible filter element mounted on a filter carrier for delivery through a vascular system of a patient, the filter element being movable between a collapsed stored position against the filter carrier for movement through the vascular system, and an expanded position for occluding a blood vessel such that blood passing through the blood vessel is delivered through the filter element, the fitter element comprising a collapsible filter body having an inlet end and an outlet end, the inlet end of the filter body having one or more inlet openings sized to allow blood and embolic material enter the filter body, the outlet end of the filter body having a plurality of outlet openings sized to allow through passage of blood but to retain undesired embolic material within the filter body;
means for closing the inlet openings at the inlet end of the filter body, and means for collapsing the filter body on the support.
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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.
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Citations
42 Claims
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1. An embolic protection device comprising:
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a collapsible filter element mounted on a filter carrier for delivery through a vascular system of a patient, the filter element being movable between a collapsed stored position against the filter carrier for movement through the vascular system, and an expanded position for occluding a blood vessel such that blood passing through the blood vessel is delivered through the filter element, the fitter element comprising a collapsible filter body having an inlet end and an outlet end, the inlet end of the filter body having one or more inlet openings sized to allow blood and embolic material enter the filter body, the outlet end of the filter body having a plurality of outlet openings sized to allow through passage of blood but to retain undesired embolic material within the filter body;
means for closing the inlet openings at the inlet end of the filter body, and means for collapsing the filter body on the support. - 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, 30, 31, 32, 33, 34, 35, 36, 37, 38, 40)
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- 25. A device as claimed in any proceeding claim including a delivery catheter in which an external sheath is engagable with the filter element or filter carrier to provide push during delivery and is removable to allow maximum space in the vascular cross-section during an interventional procedure.
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39. A device as claimed in claim wherein the filter element comprises a mesh work structure with large proximal inlet holes and small distal outlet holes wherein the mesh structure is collapsible into a small diameter delivery catheter and is expandable upon deployment to a shape which is remembered by the mesh structure either through shape memory characteristics or elastic memory characteristics.
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41. A filter retrieval system for use with the device as claimed in any proceeding claim comprising a longitudinal catheter with a deformable tip to assist the pull back of the filter into it.
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42. A method for the capture and removal of embolic material from a blood vessel during an interventional procedure comprising the steps:
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preparing an embolic protection device comprising guidewire having a proximal end and a distal end, a collapsible filter element mounted adjacent the distal end of the guidewire, the filter element 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 element from a proximal inlet end of the fiter 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 element 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 catheter, and withdrawing the catheter from the patient.
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Specification