Embolic protection device
The disclosure relates to an embolic filter, a support structure therefor, and methods for maintaining said filter in a compact state prior to deploying the filter.
1. An augmented constraint apparatus for delivery and deployment of an intraluminal filter within a lumen comprising:
an elongated support member for an intraluminal filter, said support member having a proximal end, a distal end, and a shaft therebetween;
an intraluminal filter associated with the distal end of the support member, said filter comprising a plurality of outwardly biased struts, said filter having a collapsed state and a deployed state;
a motion restricting member having the form of a ring disposed about at least a portion of the outwardly biased struts of the filter in the collapsed state;
a containment structure having two or more apertures therein; and
an activation element having a first position and a second position, wherein in the first position, the activation element engages the two or more apertures of the containment structure and the containment structure encompasses at least a portion of the outwardly biased struts, further wherein in the second position, the activation element is disengaged from at least one of the apertures of the containment structure allowing the intraluminal filter to move from the collapsed state toward the deployed state thereby allowing the struts to at least partially expand moving at least a portion of the motion restricting member proximally from its first position to its second position as the filter deploys within the lumen; wherein the ring rolls along the outwardly biased struts of the filter as the filter moves from the collapsed state toward the deployed state.
2. The apparatus of claim 1 , wherein the filter comprises a filter membrane.
3. The apparatus of claim 1 , wherein the filter is mounted about a spinner tube disposed about a guidewire.
4. The apparatus of claim 1 , further comprising a recovery sheath having a lumen therein, said lumen sized to at least partially contain the collapsed state of the filter, and having a distal opening sized to engage the motion restricting member and advance at least a portion of the motion restricting member over the plurality of outwardly biased struts as the recovery sheath is advanced distally.
5. The apparatus of claim 1 , further comprising a second motion restricting member disposed about at least a second portion of the filter, wherein when the intraluminal filter moves from the collapsed state toward the deployed state, at least a portion of the second motion restricting member moves distally.