Sealant for medical purposes; medical preparations, namely, hydrogel sealants for dural repair during surgery; in situ polymerizing hydrogel-based medical preparations, namely, sealant preparations for tissue sealing and space filling; surgical sealant; surgical sealant preparations; biodegradable surgical sealant; polymer precursors that, when combined, form an in situ polymerizing hydrogel used as a surgical sealant in surgical procedures; surgical sealant for use in dural repair during surgery; sealant compositions for use on membranous coverings during a surgical procedure; dural sealant for use on a human cranial dura mater during a surgical procedure; medical polymer precursors for use in forming a surgical sealant and filler; medical preparations in the nature of precursor polymers sold as a feature of in situ polymerizing hydrogel sealants for medical use, namely, for tissue and membrane repair in surgical procedures; in situ polymerizing hydrogel-based medical compositions in the nature of medical sealants; medical sealants for sealing tissues for use with related medical equipment; in situ polymerizing hydrogel-based medical preparations, namely, surgical sealant preparations; polymer sealants used in tissue and membrane repair in surgical procedures; medical polymers for use in tissue and membrane repair in surgical procedures; medical preparations, namely, an in situ polymerizing hydrogel that is a tissue and membrane sealant and space filler for use in surgery; medical preparation comprising sealant preparations that form a surgical sealant used in a surgical procedures; medical preparations composed of polymer precursors that, when combined, form a hydrogel sealant used to seal the cranial dura mater after cranial surgery; medical polymers for use as a dural sealant in a surgical procedures; medical polymers used to seal the cranial dura mater after cranial surgery; Surgical devices and instruments, sold filled with surgical sealant, for applying and delivering such surgical sealant; medical devices for sealing tissue and membranous coverings in surgical procedures, sold filled with polymer precursors that, when combined, form an in situ polymerizing hydrogel surgical sealant, namely, for applying and delivering surgical sealant in surgical procedures

Surgical devices and instruments for applying and delivering surgical sealant; medical instruments and apparatus, namely, delivery apparatus for surgical sealant; medical devices for applying and delivering medical sealant; Medical devices for applying and delivering polymer precursors that, when combined, form a hydrogel sealant used in dural repair during surgery; medical devices for sealing tissue and membranous coverings in surgical procedures; medical devices for sealing tissue and membranous coverings in surgical procedures, namely, devices for applying and delivering surgical sealant in surgical procedures; medical apparatus for applying sealant for use in tissue sealing; medical instruments for applying sealant for use in tissue sealing; medical apparatus and instruments for sealing tissues; surgical instruments for applying sealant in tissue sealing