title: Development of a novel biodegradable drug-eluting ventilation tube for chronic otitis media with effusion.
abstract: OBJECTIVE
  To develop a novel drug-eluting biodegradable ventilation tube (VT), to evaluate in vitro sustained release and antibacterial adherence of ofloxacin-loaded biodegradable VT on Pseudomonas aeruginosa, and to evaluate in vivo biodegradation of VT in guinea pig ears.
  
  
  METHODS
  A randomized animal study.
  
  
  METHODS
  In vitro drug release and degradation of ofloxacin-loaded VT were studied in water for 3 months. Bacterial adherence was evaluated by inoculating the VT with P aeruginosa suspension for 6 days. Scanning electron microscopy (SEM) was used for morphologic analysis. Guinea pigs were assigned to three groups: commercial Mini Shah VT, biodegradable unloaded VT, and biodegradable ofloxacin-loaded VT. Myringotomy and VT insertion were performed. SEM of VTs and histology were performed at 2, 4, 10, and 18 weeks.
  
  
  RESULTS
  A total of 81.7% of ofloxacin in VT was eluted over 3 months. Biodegradable VTs had smoother surfaces and less bacteria adherence compared to Mini Shah VTs. VTs with ofloxacin had the least bacteria adherence. VTs resulted in neither inflammation nor otorrhea 18 weeks postinsertion in guinea pigs. Histology showed the new VTs were biocompatible. The VTs were still functioning and patent after 18 weeks postinsertion but had started degrading.
  
  
  CONCLUSIONS
  The first novel biodegradable ofloxacin-loaded VT with sustainable drug release technology and antibacterial adherence property was studied. Patency beyond 4.5 months allowed an adequate period of ventilation. The complete degradation of the VT warrants further studies to evaluate the duration of VT resorption in situ and healing of the ear drum.
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, National University of Singapore, Singapore.
authors.forename: Chee Wee
authors.initials: CW
authors.lastname: Gan
authors.forename: Wai Hon
authors.initials: WH
authors.lastname: Chooi
authors.forename: Herr Cheun Anthony
authors.initials: HC
authors.lastname: Ng
authors.forename: Yee Shan
authors.initials: YS
authors.lastname: Wong
authors.forename: Subbu S
authors.initials: SS
authors.lastname: Venkatraman
authors.forename: Lynne Hsueh Yee
authors.initials: LH
authors.lastname: Lim
mesh_terms: D000818:Animals; D020099:Coated Materials, Biocompatible; D006168:Guinea Pigs; D019344:Lactic Acid; D008876:Middle Ear Ventilation / Q000295:instrumentation*; D015242:Ofloxacin / Q000494:pharmacology*; D010034:Otitis Media with Effusion / Q000188:drug therapy* / Q000382:microbiology / Q000601:surgery*; D038781:Otoscopy; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011552:Pseudomonas Infections / Q000188:drug therapy* / Q000382:microbiology / Q000601:surgery*; D011550:Pseudomonas aeruginosa / Q000187:drug effects*; D011897:Random Allocation
chemical_list: D020099:Coated Materials, Biocompatible; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D015242:Ofloxacin