한빛사 논문
Hyunwoo Yuk1,8, Claudia E. Varela2,3,8, Christoph S. Nabzdyk4,5, Xinyu Mao1, Robert F. Padera6, Ellen T. Roche1,2,3 & Xuanhe Zhao1,7,*
1 Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
2 Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA, USA.
3 Harvard-MIT Program in Health Sciences and Technology, Cambridge, MA, USA.
4 Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN, USA.
5 Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
6 Department of Pathology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, USA.
7 Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
8 These authors contributed equally: Hyunwoo Yuk, Claudia E. Varela.
*Correspondence to Xuanhe Zhao
Abstract
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. 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. Although tissue adhesives have potential advantages over suturing or stapling5,6, 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. 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. 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. Subsequent covalent crosslinking with amine groups on the tissue surface further improves the adhesion stability and strength of the DST. 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. The DST may be useful as a tissue adhesive and sealant, and in adhering wearable and implantable devices to wet tissues.
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