A system for retrieving an obstruction in a blood vessel, the system comprising: an outer catheter comprising a lumen therethrough, the lumen comprising a circumference; and a clot retrieval device positioned within, and translatable through the lumen of the outer catheter, the clot retrieval device comprising: an elongate flexible delivery member comprising a distal end; an expansile tube comprising a lumen therethrough, the expansile tube affixed to the distal end of the elongated flexible delivery member; and an expansile funnel affixed to the expansile tube, the expansile funnel expandable from a collapsed delivery state in which the expansile funnel is sized to traverse the lumen of the outer catheter to an expanded deployed state in which the expansile funnel comprises an outer circumference greater than the circumference of the lumen of the outer catheter, the expansile funnel comprising: a fluid-impermeable flexible tube comprising a lumen therethrough, the lumen of the flexible tube in communication with the lumen of the expansile tube, an open distal mouth disposed at a distal end of the flexible tube, a first ring of struts disposed approximate the open distal mouth, the first ring of struts affixed to the flexible tube and structurally supported by the flexible tube, and a second ring of struts disposed in a proximal direction in relation to the first ring of struts, the second ring of struts affixed to the flexible tube and structurally supported by the flexible tube an aspiration source configured to apply suction through the lumen of the catheter, the lumen of the sealing tube, and the open distal mouth. an outer catheter comprising a lumen therethrough, the lumen comprising a circumference; and a clot retrieval device positioned within, and translatable through the lumen of the outer catheter, the clot retrieval device comprising: an elongate flexible delivery member comprising a distal end; an expansile tube comprising a lumen therethrough, the expansile tube affixed to the distal end of the elongated flexible delivery member; and an expansile funnel affixed to the expansile tube, the expansile funnel expandable from a collapsed delivery state in which the expansile funnel is sized to traverse the lumen of the outer catheter to an expanded deployed state in which the expansile funnel comprises an outer circumference greater than the circumference of the lumen of the outer catheter, the expansile funnel comprising: a fluid-impermeable flexible tube comprising a lumen therethrough, the lumen of the flexible tube in communication with the lumen of the expansile tube, an open distal mouth disposed at a distal end of the flexible tube, a first ring of struts disposed approximate the open distal mouth, the first ring of struts affixed to the flexible tube and structurally supported by the flexible tube, and a second ring of struts disposed in a proximal direction in relation to the first ring of struts, the second ring of struts affixed to the flexible tube and structurally supported by the flexible tube an aspiration source configured to apply suction through the lumen of the catheter, the lumen of the sealing tube, and the open distal mouth. an elongate flexible delivery member comprising a distal end; an expansile tube comprising a lumen therethrough, the expansile tube affixed to the distal end of the elongated flexible delivery member; and an expansile funnel affixed to the expansile tube, the expansile funnel expandable from a collapsed delivery state in which the expansile funnel is sized to traverse the lumen of the outer catheter to an expanded deployed state in which the expansile funnel comprises an outer circumference greater than the circumference of the lumen of the outer catheter, the expansile funnel comprising: a fluid-impermeable flexible tube comprising a lumen therethrough, the lumen of the flexible tube in communication with the lumen of the expansile tube, an open distal mouth disposed at a distal end of the flexible tube, a first ring of struts disposed approximate the open distal mouth, the first ring of struts affixed to the flexible tube and structurally supported by the flexible tube, and a second ring of struts disposed in a proximal direction in relation to the first ring of struts, the second ring of struts affixed to the a fluid-impermeable flexible tube comprising a lumen therethrough, the lumen of the flexible tube in communication with the lumen of the expansile tube, an open distal mouth disposed at a distal end of the flexible tube, a first ring of struts disposed approximate the open distal mouth, the first ring of struts affixed to the flexible tube and structurally supported by the flexible tube, and a second ring of struts disposed in a proximal direction in relation to the first ring of struts, the second ring of struts affixed to the flexible tube and structurally supported by the flexible tube an aspiration source configured to apply suction through the lumen of the catheter, the lumen of the sealing tube, and the open distal mouth.