Particles

1. A method of treating a vascular defect, the method comprising:

delivering particles to a vascular defect behind a porous material,

wherein the particles include a reaction product of a prepolymer solution including:

a poly(ethylene glycol) diacrylamide macromer, a poly(ethylene glycol) diacrylate macromer, a poly(ethylene glycol) dimethacrylate macromer, a poly(ethylene glycol) dimethacrylamide macromer, or a combination thereof; and

at least one monomer,

wherein the particles have a diameter greater than a maximum pore size of the porous material.

2. The method of claim 1 , wherein the particles are delivered using a microcatheter.

3. The method of claim 1 , the microcatheter is a 0.0165″ microcatheter.

4. The method of claim 1 , wherein the diameter is between about 50 μm and about 1,500 μm.

5. The method of claim 1 , wherein the diameter is between about 200 μm and about 500 μm.

6. The method of claim 4 , wherein the diameter expands to about 400 μm to about 1500 μm.

7. The method of claim 2 , wherein the porous material is on a stent.

8. The method of claim 7 , wherein the stent is deployed over the microcatheter.

9. The method of claim 1 , wherein the pore size is about 0.006″.

10. The method of claim 1 , wherein the pore size is at most about 0.09″.

11. The method of claim 1 , wherein the prepolymer solution further includes a crosslinker.

12. The method of claim 11 , wherein the crosslinker is biodegradable.

13. The method of claim 11 , wherein the crosslinker has a structure:

wherein each n is independently 1-20;

wherein d, e, f, and g are each independently 1-20; or

14. The method of claim 11 , wherein the particles further include a visualization agent having a structure:

15. The method of claim 1 , wherein the at least one monomer includes ionic groups.

16. The method of claim 15 , wherein the at least one monomer containing ionic groups is sodium acrylate.