Zwitterionic Clicking for Enhanced Orthopedics

描述（由申请人提供）：这个小企业创新研究第一阶段项目旨在开发新的两性离子点击方法，用于增强耐用性的骨科表面。随着美国人寿命的延长和活动量的增加，全关节置换术正变得越来越普遍。目前的骨科关节的平均寿命约为20年。到那时，关节磨损会导致颗粒形成，随之而来的是疼痛和炎症，最终需要翻修。更换关节植入物的翻修手术比初始关节置换术更困难、更痛苦、更昂贵。来自日本的学术研究表明，一种很有前途的磷酸胆碱两性离子光化学接枝涂层可以显著减少磨损，同时减少促炎细胞因子的释放和体内巨噬细胞的募集。然而，这种方法使用了危险的单体，不能很好地用于生产。该项目侧重于“Click To”涂层方法，该方法由预制的磷胆碱或其他两性离子共聚物组成，该共聚物将与功能化超高交联聚乙烯矫形植入物进行非常快速的非光化学反应，以获得具有更高耐磨性的植入物。“点击到”技术将允许两性离子涂层技术通过制造友好的过程商业化。

DESCRIPTION (provided by applicant): This Small Business Innovation Research Phase I project is designed to develop new zwitterionic click methodology for orthopedic surfaces with enhanced durability. As Americans live longer and more actives lives, total joint replacement is becoming more common. Current orthopedic joints have average life spans of approximately 20 years. By that point wear on the joint causes particulate formation, with subsequent pain and inflammation, requiring eventual revision. Revision surgeries to replace joint implants are more difficult, painful, and expensive than initial joint replacement. Academic work from Japan demonstrated a promising photochemical graft coating of phosphorylcholine zwitterion that reduced wear significantly while also decreasing pro-inflammatory cytokine release and macrophage recruitment in vivo. However, this method uses hazardous monomer and will not scale well for manufacturing use. This project focuses on "Click To" coating methodology which consists of a pre-made phosphorylcholine or other zwitterionic copolymer that will undergo very fast non-photochemical reactions with the functionalized ultrahigh crosslinked polyethylene orthopedic implant to achieve an implant with increased wear resistance. The "Click To" technology will allow commercialization of the zwitterionic coating technology by a manufacturing-friendly process. PUBLIC HEALTH RELEVANCE: Zwitterionic coatings on orthopedic implants have tremendous potential for decreasing implant wear and improved anti-fouling properties. Approximately 600,000 Americans receive knee and hip implants annually in the US, over 1 million worldwide. This market is large, over $5.4 billion in 2006, and more than a fivefold increase in the number of total joint replacements are expected in the next 20 years. Substantial savings in the United States, on the order of more than $100 million, can be achieved with even a one year improvement of in the average life of an implant. The cost savings is a minor point when the benefit of an improved quality of life for the many users is considered by the elimination of the need for painful revision surgeries.