Hydrogel for medical purposes; hydrogel for use in medical procedures; in situ polymerizing hydrogel-based preparations for medical purposes; implantable surgical materials, namely, pliable, synthetic hydrogel; kits comprised of a pre-filled applicator of hydrogel precursors for medical purposes; kits for use in medical and surgical procedures comprised of hydrogel precursors that react to form a hydrogel when combined with each other and also including applicators therefore; medical devices ...