Soft hydrogels interpenetrating silicone – a polymer network for drug releasing medical devices

Research output: Contribution to journalJournal articleResearchpeer-review

Søren Langer Steffensen, Vestergaard, Merete H., Eva Horn Møller, Minna Grønning Jensen, Martin Alm, Henrik Franzyk, Hanne Mørck Nielsen

Materials for the next generation of medical devices will require not only the mechanical stability of current devices, but must also possess other properties such as sustained release of drugs in a controlled manner over a prolonged period of time. This work focuses on creating such a sophisticated material by forming an interpenetrating polymer network (IPN) material through modification of silicone elastomers with a poly(2-hydroxyethyl methacrylate) (PHEMA)-based hydrogel. IPN materials with a PHEMA content in the range of 13%–38% (w/w) were synthesized by using carbon dioxide-based solvent mixtures under high pressure. These IPNs were characterized with regard to microstructure as well as ability of the hydrogel to form a surface-connected hydrophilic carrier network inside the silicone. A critical limit for hydrogel connectivity was found both via simulation and by visualization of water uptake in approximately 25% (w/w) PHEMA, indicating that entrapment of gel occurs at low gel concentrations. The optimized IPN material was loaded with the antibiotic ciprofloxacin, and the resulting drug release was shown to inhibit bacterial growth when placed on agar, thus demonstrating the potential of this IPN material for future applications in drug-releasing medical devices.
Original languageEnglish
JournalJournal of Biomedical Materials Research. Part B: Applied Biomaterials
Volume104
Issue number2
Pages (from-to)402-410
Number of pages9
ISSN1552-4973
DOIs
Publication statusPublished - 2016

ID: 132263435