Device and method for clot engagement and capture
A clot removal device and method for removing a clot from a blood vessel may include an expandable clot engagement element, an expandable clot capture element, and a sheath surrounding and compressing the capture element and the engagement element. The sheath may be removable to thereby enable the capture element to expand in a blood vessel in which the sheath is deployed, and to enable the engagement element to expand within the capture element.
1. A clot removal device configured for deployment from a proximal side of a clot location, the device comprising:
an expandable clot capture element configured for deployment to the clot location from the proximal side;
an expandable clot engagement element including a helix and configured for deployment to the clot location from the proximal side while compressed in a substantially non-expanded state within the clot capture element, and wherein the helix has an open end on a distal side thereof configured, in an expanded state, to encircle a clot from the proximal side of the clot location, with a terminal end of the clot engagement element being located substantially at the expanded open end of the helix and aligned with a circumference of the helix, to define a substantially unobstructed channel for encircling the clot; and
a sheath surrounding and compressing the capture element and the engagement element in a pre-deployed state, wherein the capture element and the engagement element are simultaneously compressed within the sheath prior to clot encirclement, the sheath being removable upon deployment to enable the engagement element to expand within the capture element on the proximal side of the clot location prior to clot encirclement.
2. The device of claim 1 , wherein the capture element surrounds the engagement element.
3. The device of claim 1 , wherein the engagement element is a coil.
4. The device of claim 1 , wherein the engagement element is sized to be movable within the capture element upon removal of the sheath.
5. The device of claim 1 , wherein the engagement element is sized to be rotatable within the capture element upon removal of the sheath.
6. The device of claim 1 , wherein the capture element has a length that is longer than a length of the engagement element.
7. The device of claim 1 , further comprising a locking mechanism for locking the clot engagement element within the clot capture element.
8. The device of claim 1 , wherein the capture element is sized so that in a deployed state it engages a blood vessel wall, and wherein the engagement element is sized so that in a deployed state the engagement element is movable within the capture element.
9. The device of claim 1 , wherein the capture element and the engagement element are configured such that when used, the engagement element is between the capture element and the clot.
10. The device of claim 1 , wherein the helix, in an expanded state, is configured to exhibit a substantially constant radius.
11. The device of claim 1 , wherein the helix, in an expanded state, is configured to exhibit a substantially constant pitch.
12. The device of claim 1 , wherein the helix is configured for rotation to thereby encircle the clot from the proximal side of the clot location.
13. The device of claim 1 , wherein the clot capture element is configured for positioning proximal to the clot engagement element and is sized to enable the encircled clot to be pulled proximally into the clot capture element.
14. The device of claim 1 , wherein the capture element and the engagement element are configured such that when used, the engagement element is between the capture element and the clot.