Implantable drug depots have the capacity to locally meet therapeutic requirements by maximizing local drug efficacy and minimizing potential systemic side effects. Tubular organs including the gastrointestinal tract, respiratory tract and vasculature all manifest with endoluminal disease. The anatomic distribution of localized drug delivery for these organs using existing therapeutic modalities is limited. Application of local depots in a circumferential and extended longitudinal fashion could transform our capacity to offer effective treatment across a range of conditions. Here we report the development and application of a kirigami-based stent platform to achieve this. The stents comprise a stretchable snake-skin-inspired kirigami shell integrated with a fluidically driven linear soft actuator. They have the capacity to deposit drug depots circumferentially and longitudinally in the tubular mucosa of the gastrointestinal tract across millimetre to multi-centimetre length scales, as well as in the vasculature and large airways. We characterize the mechanics of kirigami stents for injection, and their capacity to engage tissue in a controlled manner and deposit degradable microparticles loaded with therapeutics by evaluating these systems ex vivo and in vivo in swine. We anticipate such systems could be applied for a range of endoluminal diseases by simplifying dosing regimens while maximizing drug on-target effects through the sustained release of therapeutics and minimizing systemic side effects.
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Abaqus scripts used for the numerical analyses are available from the corresponding author upon request.
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We thank R. Langer for helpful discussion and support. We thank V. Spanoudaki and W. Huang for help with the micro-CT and histology images, A. Rafsanjani for productive discussions and all colleagues of the Langer and Traverso Laboratories for fruitful discussions. This work was funded in part by the Karl van Tassel (1925) Career Development Professorship and the Department of Mechanical Engineering, Massachusetts Institute of Technology.
S.B., Y.S., S.A., M.A. and G.T. are co-inventors on provisional patent application 63/041154 describing the technologies presented in this paper. Complete details of all relationships for profit and not for profit for G.T. can be found at the following link: https://www.dropbox.com/sh/szi7vnr4a2ajb56/AABs5N5i0q9AfT1IqIJAE-T5a?dl=0. The other authors declare no competing interests.
Peer review Information Nature Materials thanks Edith Mathiowitz and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Supplementary Figs. 1–13, Methods and captions for Videos 1–9.
Deformation of the kirigami-based stent obtained using FE simulations.
Effect of the size of kirigami needles on deformation of the kirigami-based stents using FE simulations.
Effect of kirigami shell thickness on deformation of the kirigami-based stents using FE simulations.
Fluid-powered soft linear actuator.
Effect of kirigami surface thickness on deformation of the kirigami stents using experiments and FE simulations.
Effect of the size of kirigami needles on deformation of the kirigami stents using experiments and FE simulations.
Characterization of the fabricated oesophageal kirigami stent.
Spray coating of the kirigami stent.
Endoscopic evaluation of oesophagus after in vivo deployment of the kirigami stents in pigs.
Source data for numerical characterization of kirigami-based stents.
Source data for experimental characterization of the oesophageal stent prototypes.
Source data for evaluation of controlled penetration of the stent needles.
Source data for extended drug release.
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Babaee, S., Shi, Y., Abbasalizadeh, S. et al. Kirigami-inspired stents for sustained local delivery of therapeutics. Nat. Mater. (2021). https://doi.org/10.1038/s41563-021-01031-1