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However, the scalable fabrication of hydrogel three\u2010dimensional (3D) stents with sufficient mechanical support remains a major challenge, owing to the intrinsic flexibility of hydrogel materials. Here, inspired by the water\u2010welding mechanism of the butterfly proboscis, we report a facile water\u2010mediated welding strategy for sodium alginate (SA) films, which enables the assembly of fully integrated 3D stents using only water as the processing medium. The as\u2010prepared solid\u2010walled 3D stents can be seamlessly converted into hollow\u2010walled architectures via a metal ion\u2010induced asymmetric crosslinking followed by solvent exchange. Notably, the hollow\u2010walled structure enables the mechanical support force five times that of solid\u2010walled ones, rendering these hydrogel 3D stents highly attractive for biodegradable medical stents. This work provides a versatile and environmentally benign route to engineer 3D hydrogel stents, thereby advancing the development of advanced implantable biomedical devices.<\/jats:p>","DOI":"10.1002\/adhm.71692","type":"journal-article","created":{"date-parts":[[2026,9,6]],"date-time":"2026-09-06T14:59:00Z","timestamp":1788706740000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Butterfly Proboscis\u2010Inspired Water\u2010Welding Strategy for Hollow\u2010Walled Hydrogel 3D Stents With Ultrahigh Mechanical Support Capacity"],"prefix":"10.1002","volume":"15","author":[{"given":"Xi","family":"Yu","sequence":"first","affiliation":[{"name":"School of Chemistry and Molecular Engineering East China Normal University  Shanghai People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guang","family":"Qian","sequence":"additional","affiliation":[{"name":"Department of Orthopedics Fifth 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