Expansile member

1. A system for delivering liquid embolic to a target site comprising:

a liquid embolic;

a microcatheter configured to deliver the liquid embolic;

an expansile member disposed around an outside surface of a distal end of the microcatheter, wherein the expansile member is configured for insertion into the neck of an aneurysm and is substantially frustoconical, having an increasing diameter from a proximal end to a distal end in an expanded state;

a coil securing the expansile member to the distal end of the microcatheter.

2. The system of claim 1 wherein the expansile member comprises a hydrogel.

3. The system of claim 1 wherein the coil has a diameter less than an expanded diameter of the expansile member.

4. A system for occluding blood flow in a vessel while delivering liquid embolic to a target site comprising:

a microcatheter including a frustoconical expansile member at a distal end thereof and defining a lumen;

a liquid embolic deliverable through said lumen; and,

a retaining member surrounding the expansile member and containing slots through which the expansile member expands when assuming an expanded state, wherein in said expanded state, said expansile member has a diameter that decreases proximally, thereby allowing said expansile member to seat on an inside surface of an aneurysm neck.

5. The system of claim 4 wherein the expansile member comprises a hydrogel.

6. The system of claim 4 wherein the retaining member securing the expansile member to the distal end of the delivery device comprises a coil.

7. The system of claim 4 wherein the retaining member has a diameter less than an expanded diameter of the expansile member.

8. The system of claim 4 wherein the retaining member comprises a retention sleeve attached to the delivery device and at least partially containing the expansile member.

9. The system of claim 4 wherein said slots are arranged helically.

10. The system of claim 4 wherein said slots are arranged longitudinally.