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Park, Jihoon; Ghanim, Ramy; Rahematpura, Adwik; Gerage, Caroline; Abramson, Alex
Journal of controlled release, February 2024, 2024-Feb, 2024-02-00, 20240201, Volume: 366Journal Article
Drug delivery systems which rely on diffusion for mass transport, such as hydrogels and nanoparticles, have enhanced drug targeting and extended delivery profiles to improve health outcomes for patients suffering from diseases including cancer and diabetes. However, diffusion-dependent systems often fail to provide >0.01–1% drug bioavailability when transporting macromolecules across poorly permeable physiological tissues such as the skin, solid tumors, the blood-brain barrier, and the gastrointestinal walls. Convection-enabling robotic ingestibles, wearables, and implantables physically interact with tissue walls to improve bioavailability in these settings by multiple orders of magnitude through convective mass transfer, the process of moving drug molecules via bulk fluid flow. In this Review, we compare diffusive and convective drug delivery systems, highlight engineering techniques that enhance the efficacy of convective devices, and provide examples of synergies between the two methods of drug transport. Display omitted •Quantitative analysis of how physiological diffusion barriers inhibit drug delivery.•Fabrication methods for convection-enabling robotic devices.•Strategies for tuning injection parameters in convection-enabling devices.
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