Smriti BoharaNathan RohnerEmily BudziszewskiJackrit SuthakornHorst A. von RecumAgata A. ExnerMahidol UniversityCase Western Reserve University2022-08-042022-08-042021-09-01Annals of Biomedical Engineering. Vol.49, No.9 (2021), 2513-252115739686009069642-s2.0-85108837634https://repository.li.mahidol.ac.th/handle/123456789/76936This work demonstrates a slow, sustained drug delivery system that provides on-demand delivery bursts through the application of pulsed therapeutic ultrasound (TUS). Insoluble β-cyclodextrin-polymer (pCD) disks were loaded with a saturated antibiotic solution of rifampicin (RIF) and used for drug delivery studies. To obtain on-demand release from the implants, TUS was applied at an intensity of 1.8 W/cm2. The therapeutic efficacy of the combination treatment was assessed in bacterial culture via an in vitro Staphylococcus aureus bioluminescence assay. The results demonstrated that the application of pulsed TUS at 3 MHz and 1.8 W/cm2 to pCD implants leads to a significantly higher short-term burst in the drug release rate compared to samples not treated with TUS. The addition of TUS increased the drug release by 100% within 4 days. The pCD disk + RIF stimulated with TUS showed a comparatively higher bacterial eradication with CFU/mL of 4.277E+09, and 8.00E+08 at 1 and 24 h compared with control treated bacteria at 1.48E+10. Overall, these results suggest that the addition of pulsed TUS could be an effective technology to noninvasively expedite antibiotic release on demand at desired intervals.Mahidol UniversityEngineeringArticleSCOPUS10.1007/s10439-021-02814-y