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Sustained local drug delivery from a novel polymeric ring to inhibit intimal hyperplasia
Author(s) -
Kanjickal Deenu,
Lopina Stephanie,
EvanchoChapman Mary M.,
Schmidt Steven,
Donovan Duane
Publication year - 2010
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.32307
Subject(s) - biocompatibility , intimal hyperplasia , materials science , drug delivery , biomedical engineering , ex vivo , in vivo , ethylene glycol , plga , sterilization (economics) , anastomosis , hyperplasia , medicine , pharmacology , surgery , nanotechnology , pathology , nanoparticle , chemistry , biology , microbiology and biotechnology , organic chemistry , metallurgy , foreign exchange market , smooth muscle , economics , monetary economics , foreign exchange
The long‐term clinical success of autologous vein and synthetic vascular grafts are limited because of the development of anastomotic intimal hyperplasia (IH). We have previously published data suggesting that cyclosporine (CyA) may reduce the development of IH in a canine model (Hirko et al., J Vasc Surg 1993;17:877–887). However, systemic administration of CyA could create serious adverse effects. Therefore, it is our long‐term goal to test the hypothesis that the controlled local release of CyA from a polymeric vascular wrap would prevent the development of IH. To test this hypothesis, we developed a controlled release polymeric ring that could be placed around anastomotic sites to deliver therapeutic drugs locally. The ring is a composite polymeric device consisting of poly( DL ‐lactide‐ co ‐glycolide) (PLGA) microspheres embedded in a poly(ethylene glycol) hydrogel. Several in vitro studies were conducted to evaluate the effects of different sterilization procedures on the properties of the device. It was determined that gamma sterilization was the preferred sterilization method of choice for this device. In vivo studies were conducted on a swine model to evaluate the biocompatibility of the ring. The histological findings of the ring implants at 2 and 4 weeks demonstrate the biocompatibility of this device. © 2009 Wiley Periodicals, Inc. J Biomed Mater Res, 2010