Embolic protection device
First Claim
1. A vascular filtration system for removing embolic material in a body fluid flowing within a vessel at a treatment site, comprising;
- a delivery system comprising a delivery catheter having a push element and a filter retention sleeve extending distally of the push element, the filter retention sleeve defining a delivery lumen; and
a filter element comprising a support frame, a flexible membrane and a tubular sleeve, the filter element disposed within the delivery lumen but not attached to the push element, wherein the support frame includes a pre-deployment collapsed state and a deployment expanded state,the filter element defines a proximal inlet opening and a plurality of distal outlet openings, the outlet openings allow the body fluid to flow through the filter element but retain embolic material within the filter element, and the inlet opening is larger than any of the outlet openings, andthe filter element, in the collapsed state within the delivery lumen, is configured to be pushed along a medical guidewire via the push element by advancement of the delivery catheter toward the treatment site.
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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 slops (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
19 Claims
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1. A vascular filtration system for removing embolic material in a body fluid flowing within a vessel at a treatment site, comprising;
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a delivery system comprising a delivery catheter having a push element and a filter retention sleeve extending distally of the push element, the filter retention sleeve defining a delivery lumen; and a filter element comprising a support frame, a flexible membrane and a tubular sleeve, the filter element disposed within the delivery lumen but not attached to the push element, wherein the support frame includes a pre-deployment collapsed state and a deployment expanded state, the filter element defines a proximal inlet opening and a plurality of distal outlet openings, the outlet openings allow the body fluid to flow through the filter element but retain embolic material within the filter element, and the inlet opening is larger than any of the outlet openings, and the filter element, in the collapsed state within the delivery lumen, is configured to be pushed along a medical guidewire via the push element by advancement of the delivery catheter toward the treatment site. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification