Embolectomy device having multiple semi-tubular clot engaging structures

1. An elongate embolectomy device biased to transition from a radially constrained configuration to a radially expanded configuration, the embolectomy device comprising:

a plurality of elongate clot engaging structures, each clot engaging structure comprising a plurality of interconnected struts forming an open cell pattern, and having a proximal active portion and a distal protective portion,

wherein, when the embolectomy device is in the radially expanded configuration, the active portion of each clot engaging structure has a semi-tubular arcuate profile, including a convex face and a concave face facing opposite the convex face, the clot engaging structures being longitudinally disposed relative to each other such that the concave faces of the active portions are facing radially outward, and

wherein, when the embolectomy device is in the radially expanded configuration, the protective portion of each clot engaging structure has a semi-tubular arcuate profile, including a convex face and an concave face facing opposite the convex face, wherein the convex faces of the protective portions are facing radially outward, and the concave surfaces of the protective portions are facing radially inward, respectively, relative to the longitudinal axis of the embolectomy device.

2. The embolectomy device of claim 1 , wherein a strut of the active portion of a first clot engaging structure is attached to a strut of the active portion of a second clot engaging structure at one or more attachment locations, and wherein the respective protective portions of the first and second clot engaging structures are not attached to one another.

3. The embolectomy device of claim 1 , the plurality of clot engaging structures comprising first, second, and third clot engaging structures, wherein a strut of the active portion of the first clot engaging structure is attached to a respective strut of the active portions of the second and third clot engaging structures at one or more attachment locations.

4. The embolectomy device of claim 3 , wherein the respective protective portions of the first, second and third clot engaging structures are not attached to one another.

5. The embolectomy device of claim 3 , wherein the one or more attachment locations are located on or proximate to the longitudinal axis of the embolectomy device.

6. The embolectomy device of claim 1 , wherein struts forming the respective protective portions of the clot engaging structures are coupled at their edges so that the respective protective portions collectively form a trefoil-like barrel shape when the embolectomy device is in the radially expanded configuration.

7. The embolectomy device of claim 1 , further comprising a plurality of elongate elements attached to struts of at least one clot engaging structure, the elongate elements comprising one or more of filaments, suture material, fibers, threads, and wires.

8. The embolectomy device of claim 1 , further comprising a push wire attached to the active portion of each clot engaging structure, wherein the clot engaging structures are attached to one another at an attachment location in a transition region between the respective active and protective portions of the clot engaging structures.

9. The embolectomy device of claim 1 , wherein the protective portion of at least one of the clot engaging structures comprises a distal antenna.

10. The embolectomy device of claim 9 , wherein the distal antenna comprises a marker coil and an atraumatic tip.

11. The embolic device of claim 9 , wherein the distal antenna comprises at least a portion of a marker coil and of an atraumatic tip.

12. The embolectomy device of claim 1 , wherein the active portion of each clot engaging structure imparts a greater radial expansion force than is imparted by the respective protective portion of the clot engaging structure when the embolic device transitions from the radially constrained configuration to the radially expanded configuration.

13. The embolectomy device of any of claim 1 , wherein the active portion of each the clot engaging structure has a greater longitudinal length than the respective protective portion of the clot engaging structure when the embolic device is in the radially expanded configuration.

14. The embolectomy device of claim 1 , wherein the active portion of each clot engaging structure has a substantially same longitudinal length as the respective protective portion of the clot engaging structure when the embolic device is in the radially expanded configuration.

15. The embolectomy device of claim 1 , wherein the active portion of each clot engaging structure comprises an undulating element.

16. The embolectomy device of claim 15 , wherein the undulating element defines a valley region and a peak region.

17. The embolectomy device of claim 16 , wherein respective undulating elements of adjacent clot engaging structures are coupled to each other at a connection point.

18. The embolectomy device of claim 17 , wherein the connection point is between respective valley regions and peak regions of the respective undulating elements.

19. The embolectomy device of claim 15 , wherein, when the embolectomy device is transitioning from the radially constrained configuration to the radially expanded configuration, respective undulating elements of the active portions of adjacent elongate clot engaging structures exert a force pushing the respective undulating elements apart from each other.

20. The embolectomy device of claim 19 , wherein the embolectomy device is configured such that withdrawing the embolectomy device, in the radially expanded configuration, from a confined space generates a tension force drawing the undulating elements of the active portions of adjacent elongate clot engaging structures closer to each other.