![]() ![]() A reversible wet/dry adhesive inspired by mussels and geckos. ![]() Surface, interfacial and molecular aspects of polymer bioadhesion on soft tissues. Pressure-sensitive adhesives: an introductory course. The DST may be useful as a tissue adhesive and sealant, and in adhering wearable and implantable devices to wet tissues.Ĭreton, C. In vitro mouse, in vivo rat and ex vivo porcine models show that the DST can achieve strong adhesion between diverse wet dynamic tissues and engineering solids within five seconds. Subsequent covalent crosslinking with amine groups on the tissue surface further improves the adhesion stability and strength of the DST. The adhesion mechanism of this DST relies on the removal of interfacial water from the tissue surface, resulting in fast temporary crosslinking to the surface. Here we propose an alternative tissue adhesive in the form of a dry double-sided tape (DST) made from a combination of a biopolymer (gelatin or chitosan) and crosslinked poly(acrylic acid) grafted with N-hydrosuccinimide ester. Although tissue adhesives have potential advantages over suturing or stapling 5, 6, existing liquid or hydrogel tissue adhesives suffer from several limitations: weak bonding, low biological compatibility, poor mechanical match with tissues, and slow adhesion formation 5, 6, 7, 8, 9, 10, 11, 12, 13. However, such instant adhesion is challenging when wet surfaces such as body tissues are involved, because water separates the molecules of the two surfaces, preventing interactions 3, 4. Two dry surfaces can instantly adhere upon contact with each other through intermolecular forces such as hydrogen bonds, electrostatic interactions and van der Waals interactions 1, 2. ![]()
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