Apparatus for trapping emboli
A filter for filtering micro-emboli from a patient's blood during an angioplasty procedure is disclosed which comprises a plurality of curved wires connected to a rod between a first connector fixed with respect to the rod and a second connector slidingly mounted on the rod. Two layers of filter material are connected to opposite sides of the wires, and each layer includes perforations which are offset from the perforations in the other layer. When the rod and the wires are disposed within a catheter, the inner wall of the catheter compresses the wires toward the rod and when the rod is extended from the catheter, the wires resume their curved shape and pull the sliding connector along the rod toward the fixed connector.
1. An apparatus for trapping emboli in the vessel of a patient, the apparatus comprising:
a rod having an axis and a distal end that is insertable into the vessel;
a trapping element disposed adjacent the rod distal end and having proximal and distal ends connected to the rod at spaced-apart locations, the distal end of the trapping element being slidably connected to the rod, and wherein the trapping element is diametrically retractable about the rod and diametrically expandable away from the rod; and
a stop mounted on the rod distally of the distal end of the trapping element and configured to prevent distal sliding of the distal end of the trapping element when the trapping element is either expanded or retracted.
2. The apparatus of claim 1 , wherein the trapping element comprises a filter.
3. The apparatus of claim 1 , wherein the filter comprises a plurality of flexible strands.
4. The apparatus of claim 3 , wherein the filter further comprises a perforated material supported by the flexible strands.
5. The apparatus of claim 1 , wherein the trapping element has been preformed to define an ovoid volume.
6. The apparatus of claim 1 , further comprising a catheter having a lumen slidingly disposed about the rod.
7. The apparatus of claim 6 , wherein the catheter is slidingly movable over at least a portion of the trapping element for compressing the element towards the rod.
8. The apparatus of claim 1 , wherein the trapping element distal end is fixedly connected to the rod.
9. The apparatus of claim 1 , wherein the trapping element proximal end is fixedly connected to the rod.