Non-degradable, low swelling, water soluble radiopaque hydrogel polymer

A method of forming a material in situ comprising:

• introducing within a patient a mixture of a first water soluble reactive component having a molecular weight of between about 200 and about 10,000 and a second water soluble reactive component having a molecular weight between about 100 and about 2500, solubilized in a flowable solution, the mixture having a first pH and having a viscosity between about 20 cp and about 100 cp such that it maintains fluidity in order to travel through a delivery tube to fill one or more inflatable members of an implantable device comprising a stent graft, wherein the mixture retains the viscosity between about 20 cp and about 100 cp at the stent graft at the stent graft in order to continue to flow within the volume of the one or more inflatable members and conform to morphology of the walls of the one or more inflatable members, said method further comprising the initiation of the formation of a material, wherein said initiation of the formation of a material consists essentially of initiating at said first pH, a chemical reaction of functional groups on said first water soluble reactive component with functional groups on said second water soluble reactive component, said chemical reaction consisting essentially of chemical covalent bonding, to form said material, said material being formed and having a swellability less than about 20% within about 3 minutes to about 30 minutes of initiating the chemical reaction of the functional groups to form the material.

A method of forming a material in situ comprising:

• introducing within a patient a mixture of a first water soluble reactive component and a second water soluble reactive component solubilized in a flowable aqueous solution, the mixture having a viscosity between about 20 cp and about 100 cp such that it maintains fluidity in order to travel through a delivery tube to fill one or more inflatable members of an implantable device comprising a stent graft, wherein the mixture retains the viscosity between about 20 cp and about 100 cp at the stent graft at the stent graft in order to continue to flow within the volume of the one or more inflatable members and conform to morphology of the walls of the one or more inflatable members, wherein the first water soluble reactive component has a molecular weight between about 200 and about 10,000, said method further comprising the initiation of the formation of a solid and non-degradable material, wherein said initiation of the formation of a solid and non-degradable material consists essentially of initiating a chemical reaction of functional groups on said first water soluble reactive component with functional groups on said second water soluble reactive component, by thoroughly mixing together, at a first pH, said first water soluble reactive component with said second water soluble reactive component and transferring the mixture to a syringe for injection into the delivery tube at said first pH, said chemical reaction consisting essentially of chemical covalent bonding, to form said solid and non-degradable material, said solid and non-degradable material being formed and having a swellability less than about 30% and an elastic modulus of at least about 30 psi within about 3 minutes to about 30 minutes after completing mixing of the components.