Photoresponsive, biocompatible materials for reconfigurable intraocular lenses

用于可重构人工晶状体的光响应、生物相容性材料

• 批准号: DH-2022-00249
• 负责人: Saravanamuttu, Kalaichelvi
• 金额: $ 6.48万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Discovery Horizons
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=748552
• 关键词: Photoresponsive; biocompatible; materials; reconfigurable; intraocular

Intraocular lenses (IOLs) are soft, flexible lenses that are surgically implanted to replace cataractous lenses in the human eye; cataract surgery is one of the most common procedures in the world. In the case of further vision changes, current IOLs must be surgically replaced. Our objective is to develop reconfigurable IOLs, which can be post-operatively and non-invasively modified with (benign) laser beams to correct vision. Reconfigurable IOLs would eliminate the need for ophthalmic surgery, associated risk of infection, recovery time and expense; they represent a disruptive technology that would significantly enhance quality of life in a predominantly geriatric and vulnerable patient population.Our approach to reconfigurable IOLs is necessarily interdisciplinary, spanning molecular-level photochemistry, optical physics, optical engineering, chemical and biomedical engineering of lenses, in vitro and in vivo safety and toxicity studies, ophthalmic surgery to patient care. It begins with the design and synthesis of light-responsive molecules, which are incorporated into biocompatible hydrogels (flexible, water-swollen networks akin to biological lenses) that can be moulded into IOLs. When exposed to wavelengths in the near infrared (NIR) region, these photoresponsive molecules within IOLs undergo carefully designed configurational changes that alter the optical properties - including the refractive index - of the hydrogel. This in turn changes the power (prescription) of the IOL - allowing it to be remotely tuned with a laser beam - even after insertion into the eye. By employing NIR light rather than visible wavelengths, we ensure that modification of the lens is elicited only by design with a NIR laser and that IOLs remain inert to ambient light. The applicants bring the diverse and broad suite of technical expertise and instrumentation critical to this project, ranging from optical physics, photo-responsive soft materials (Saravanamuttu), chemical/biomedical engineering (Sheardown), ophthalmic surgery (McLaughlin) and synthetic chemistry (Vargas Baca). We will co-supervise a team of two post-doctoral fellows, charged respectively with synthesis of photoresponsive molecules, and fabrication, characterization and viability testing of IOL prototypes. Each will mentor a graduate student during the course of the project. We will coordinate reciprocal, seamless interactions between team members, which is key to the success of this project.

人工晶状体（IOL）是通过手术植入以替代人眼中白内障晶状体的柔软、柔性晶状体;白内障手术是世界上最常见的手术之一。在进一步视力变化的情况下，必须通过手术更换当前的IOL。我们的目标是开发可重构的人工晶状体，它可以在术后和非侵入性修改（良性）激光束，以纠正视力。可重新配置的人工晶状体将消除眼科手术的需要、相关的感染风险、恢复时间和费用;它们代表了一种颠覆性的技术，将显著提高老年人和弱势患者群体的生活质量。我们的可重构IOL方法必须是跨学科的，跨越分子水平的光化学，光学物理，光学工程，镜片的化学和生物医学工程，体外和体内安全性和毒性研究，眼科手术患者护理。它从设计和合成光响应分子开始，这些分子被纳入生物相容性水凝胶（类似于生物晶状体的柔性水溶胀网络）中，可以被模塑成IOL。当暴露于近红外（NIR）区域的波长时，IOL内的这些光响应分子经历精心设计的构型变化，从而改变水凝胶的光学特性（包括折射率）。这反过来又改变了IOL的功率（处方）-允许它用激光束远程调谐-即使在插入眼睛后。通过采用NIR光而不是可见光波长，我们确保透镜的修改仅由NIR激光设计引起，并且IOL对环境光保持惰性。申请人带来了对该项目至关重要的多样化和广泛的技术专长和仪器，包括光学物理，光响应软材料（Saravanamuttu），化学/生物医学工程（Sheardown），眼科手术（McLaughlin）和合成化学（Vargas巴卡）。我们将共同监督一个由两名博士后研究员组成的团队，分别负责光敏分子的合成，以及人工晶状体原型的制造，表征和可行性测试。每个人将在项目过程中指导一名研究生。我们将协调团队成员之间的互惠，无缝互动，这是该项目成功的关键。