Injectable
hydrogels show high potential for in vivo biomedical
applications owing to their distinctive mode of administration
into the human body. In this study, we propose a material design strategy
for developing a multifunctional injectable hydrogel with good adhesiveness,
stretchability, and bioresorbability. Its multifunctionality, whereupon
multiple reactions occur simultaneously during its injection into
the body without requiring energy stimuli and/or additives, was realized
through meticulous engineering of bioresorbable precursors based on
hydrogel chemistry. The multifunctional injectable hydrogel can be
administered through a minimally invasive procedure, form a conformal
adhesive interface with the target tissue, dynamically stretch along
with the organ motions with minimal mechanical constraints, and be
resorbed in vivo after a specific period. Further,
the incorporation of functional nanomaterials into the hydrogel allows
for various in vivo diagnostic and therapeutic applications,
without compromising the original multifunctionality of the hydrogel.
These features are verified through theranostic case studies on representative
organs, including the skin, liver, heart, and bladder.