Gastrointestinal-resident, shape-changing microdevices extend drug release in vivo
Abstract
INTRODUCTION
RESULTS
Concept and fabrication of theragrippers for rectal drug delivery
Drug loading and in vitro drug release characteristics of the theragrippers
Force exerted by theragripper claws
Ex vivo and in vivo mucosal attachment of the theragrippers
Systemic delivery of a model analgesic by theragrippers
Cmax (nM) | Tmax (hours) | T1/2 (hours) | |
---|---|---|---|
Pristine drug | 345.7 ± 107.2 | 0.5 | 1.94 |
Theragripper- formulated drug |
237 ± 23 | 0.5 | 11.83 |
DISCUSSION
MATERIALS AND METHODS
Fabrication of the theragrippers
In vitro measurements of drug concentrations
FEM to estimate the force generated by the theragripper claws
Estimation of pressure applied by the theragripper and the needle tip
Measurement of the force required to penetrate mucosal tissue
Pneumatic delivery of the theragrippers
μ-CT imaging of theragripper attached to the colon mucosa
SEM imaging of the theragripper attached to rat mucosal tissue
In vivo adhesion experiments in rat colon and bright-field imaging
In vivo adhesion experiments in pig upper GI tract
Safety evaluation in pigs
Pharmacokinetic studies in rats
Acknowledgments
Supplementary Material
REFERENCES AND NOTES
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October 2020
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- Arijit Ghosh et al.
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