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Methods and apparatus of forming hydrogel systems in situ are provided using a delivery system configured to deliver two or more fluent prepolymer solutions without premature crosslinking. The delivery system comprises separate first and second lumens coupling first and second inlet ports and first

Methods and apparatus of forming hydrogel systems in situ are provided using a delivery system configured to deliver two or more fluent prepolymer solutions without premature crosslinking. The delivery system comprises separate first and second lumens coupling first and second inlet ports and first and second outlet ports, respectively, and may include a balloon, flexible distal region, mixing chamber or steerable distal end. Multi-component hydrogel systems suitable for use with the inventive methods and apparatus are also described.

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What is claimed is: 1. A method of disposing a crosslinked biocompatible material in a body comprising introducing a solution with an injection system to a fixed position in a body, with the first solution comprising at least one crosslinkable macromer that spontaneously crosslinks in situ to form

What is claimed is: 1. A method of disposing a crosslinked biocompatible material in a body comprising introducing a solution with an injection system to a fixed position in a body, with the first solution comprising at least one crosslinkable macromer that spontaneously crosslinks in situ to form the crosslinked material, wherein the macromer, within about 1 second of placement at the position, forms the material with sufficient mechanical integrity to remain at the position during the crosslinking process so as to prevent migration of the macromer away from the position. 2. The method of claim 1 wherein the solution further comprises a dissolved or dispersed therapeutic compound that is entrapped within the material. 3. The method of claim 1 wherein the macromer comprises a plurality of functional groups that undergo spontaneous chemical reaction in situ to form crosslinks of the crosslinked material. 4. The method of claim 1 wherein the macromer comprises at least three primary amines. 5. The method of claim 1 wherein the macromer comprises acrylate. 6. The method of claim 1 wherein the spontaneous crosslinking partially takes place in the injection system. 7. The method of claim 1 wherein the solution further comprises a radiocontrast agent to assist in visualizing placement of the material. 8. The method of claim 1 wherein the macromer comprises a polyethylene glycol. 9. The method of claim 1 wherein the solution is thennoreversible. 10. The method of claim 1 wherein the macromer comprises poly(oxyethylene)-poly(oxypropylene) block copolymer. 11. The method of claim 1 wherein the solution is pH-sensitive to increase viscosity upon exposure to a physiological solution in situ. 12. The method of claim 1 wherein the solution is thixotropic. 13. The method of claim 1 wherein the macromer comprises functional groups that form covalent bonds with amines. 14. The method of claim 1 wherein the macromer is cationic. 15. The method of claim 1 wherein the material is biodegradable. 16. The method of claim 1 wherein the material is not biodegradable. 17. The method of claim 1 wherein the applicator comprises a first chamber that contains an aqueous mixture of the macromer, with the macromer being polymerizable by free radical polymerization, and a second chamber that contains an aqueous mixture of an initiator, wherein actuation of the applicator mixes the first mixture with the second mixture to form the solution.