Embolic protection device
First Claim
1. A filtration device for removing embolic material in body fluid, the filtration device having a pre-deployment state and a deployment state, comprising:
- a guidewire having a longitudinal axis; and
a filter assembly comprising;
a first collar, the guidewire extending through the first collar, the first collar being slidably movable on the guidewire;
a second collar, the guidewire extending through the second collar, the second collar being slidably movable on the guidewire;
a filter element coupled to the first collar and the second collar, the filter element comprising a filter membrane and a filter support frame for the membrane;
the filter frame being collapsed in the pre-deployment state and the filter frame being expanded in the deployment state, the filter frame and collars being slidable in the pre-deployment and in the expanded deployment state;
the filter element having at least one inlet opening at a proximal end of the filter element and a plurality of outlet openings towards a distal end of the filter element, the outlet openings allowing the body fluid to flow through the filter element but retaining embolic material within the filter element, and the inlet opening being larger than any of the outlet openings; and
the filter membrane having a proximal end which terminates distal of a proximal end of the filter support frame.
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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
32 Claims
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1. A filtration device for removing embolic material in body fluid, the filtration device having a pre-deployment state and a deployment state, comprising:
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a guidewire having a longitudinal axis; and a filter assembly comprising; a first collar, the guidewire extending through the first collar, the first collar being slidably movable on the guidewire; a second collar, the guidewire extending through the second collar, the second collar being slidably movable on the guidewire; a filter element coupled to the first collar and the second collar, the filter element comprising a filter membrane and a filter support frame for the membrane; the filter frame being collapsed in the pre-deployment state and the filter frame being expanded in the deployment state, the filter frame and collars being slidable in the pre-deployment and in the expanded deployment state; the filter element having at least one inlet opening at a proximal end of the filter element and a plurality of outlet openings towards a distal end of the filter element, the outlet openings allowing the body fluid to flow through the filter element but retaining embolic material within the filter element, and the inlet opening being larger than any of the outlet openings; and the filter membrane having a proximal end which terminates distal of a proximal end of the filter support frame. - 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, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification