期刊
ADVANCED MATERIALS
卷 34, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202108266
关键词
aneurysm; embolization; endovascular; nanoclay
类别
资金
- National Institutes of Health [R01CA257558, R01HL140951, R01EB024403, R01HL137193]
- Mayo Clinic
Saccular aneurysms are outpouchings from artery walls and have limitations with current treatment options. A nanoclay-based hydrogel, called STH, is developed and shows promising results in preclinical studies, effectively treating saccular aneurysms and potentially changing medical practice.
Saccular aneurysms (SAs) are focal outpouchings from the lateral wall of an artery. Depending on their morphology and location, minimally invasive treatment options include coil embolization, flow diverter stents, stent-assisted coiling, and liquid embolics. Many drawbacks are associated with these treatment options including recanalization, delayed healing, rebleeding, malpositioning of the embolic or stent, stent stenosis, and even rupture of the SA. To overcome these drawbacks, a nanoclay-based shear-thinning hydrogel (STH) is developed for the endovascular treatment of SAs. Extensive in vitro testing is performed to optimize STH performance, visualization, injectability, and endothelialization in cell culture. Femoral artery saccular aneurysm models in rats and in pigs are created to test stability, efficacy, immune response, endothelialization, and biocompatibility of STH in both ruptured and unruptured SA. Fluoroscopy and computed tomography imaging consistently confirmed SA occlusion without recanalization, migration, or nontarget embolization; STH is also shown to outperform coil embolization of porcine aneurysms. In pigs with catastrophic bleeding due to SA rupture, STH is able to achieve instant hemostasis rescuing the pigs in long-term survival experiments. STH is a promising semisolid iodinated embolic agent that can change the standard of medical practice and potentially save lives.
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