用于眼科药物递送的隐形眼镜已经变得非常流行,由于其独特的优势,如延长磨损和超过50%的生物利用度。为了实现隐形眼镜的受控和持续的药物输送,研究人员正在研究各种系统,如聚合物纳米颗粒,微乳液,胶束,脂质体,使用维生素E,等。许多科学家正在研究治疗性隐形眼镜的不同领域,通过实施浸泡法等技术来治疗眼部疾病,分子印迹,载有药物的胶体纳米颗粒的包封,药物板/膜,离子配体聚合物体系,超临界流体技术,等。尽管使用隐形眼镜实现了持续的药物递送,水含量等关键属性,拉伸强度(机械性能),离子渗透性,透明度和氧气渗透性改变了,这限制了治疗性隐形眼镜的商业化。还有加工/制造过程中的药物稳定性(药物完整性测试)等问题,零级释放动力学(防止爆发释放),制造后单体提取步骤期间的药物释放(以去除未反应的单体),蛋白质粘附,在包装溶液中储存期间的药物释放,保质期研究,成本效益分析,等。仍有待解决。这篇综述提供了有关开发治疗性隐形眼镜的不同方法的专家意见,并特别指出了它们的优点和局限性。
Contact lenses for ophthalmic drug delivery have become very popular, due to their unique advantages like extended wear and more than 50% bioavailability. To achieve controlled and sustained drug delivery from contact lenses, researchers are working on various systems like polymeric nanoparticles, microemulsion, micelle, liposomes, use of vitamin E, etc. Numerous scientists are working on different areas of therapeutic contact lenses to treat ocular diseases by implementing techniques like soaking method, molecular imprinting, entrapment of drug-laden colloidal nanoparticles, drug plate/film, ion ligand polymeric systems, supercritical fluid technology, etc. Though sustained drug delivery was achieved using contact lens, the critical properties such as water content, tensile strength (mechanical properties), ion permeability, transparency and oxygen permeability were altered, which limit the commercialization of therapeutic contact lenses. Also issues like drug stability during processing/fabrication (drug integrity test), zero order release kinetics (prevent burst release), drug release during monomer extraction step after fabrication (to remove un-reacted monomers), protein adherence, drug release during storage in packaging solution, shelf life study, cost-benefit analysis, etc. are still to be addressed. This review provides an expert opinion on different methodology to develop therapeutic contact lenses with special remark of their advantages and limitations.