Dual Function Catheter to Prevent Thrombus and Infection

描述（由申请人提供）：这项工作的目的是完成一种新型抗菌急性血液透析导管的开发，并进行FDA批准所需的临床前测试。该产品将解决静脉导管未满足的3个主要需求：(1)提供抗生物膜和血栓的双重功能涂层，(2)结合抗菌技术，不会刺激抗生素耐药细菌的生长，(3)相对于现有产品提高抗菌活性的持续时间。该涂层基于一种新型蛋白质抗性嵌段共聚物和一种抗菌肽的组合。涂层将通过两种方式（通过柔性系绳和通过包裹）将肽结合到表面上。最近的研究表明，基于肽的行为，这是一种可行的方法，并且表明如果保持足够的溶剂可及性和分子迁移性，结合在表面时可以保持抗菌活性。用这种方法制备的抗菌肽层应具有安全性、功能性和长效性。这项技术的一个关键特点是，它通过多层机制杀死细菌，这与临床抗生素的机制根本不同，不太可能导致细菌产生耐药性。在建议的支持期内，将优化涂层成分和应用工艺。将评估涂层导管对临床相关细菌菌株的涂层效果、耐久性和机械性能，以确保所开发的涂层工艺不会改变导管的必要机械性能。涂层组件将按照GMP生产，并将制定和实施用于生产全涂层和组装导管的GMP生产工艺。FDA批准涂层导管所需的临床前测试也将完成。在该开发项目结束时，该公司将准备提交510k申请，并计划开始批准后的临床试验。这项工作的结果将对向急性和终末期肾脏疾病血液透析患者提供高质量护理的能力产生重大影响，并将降低他们因感染而发病和死亡的风险。它还将通过预防昂贵的导管相关血流感染，对控制治疗这些患者群体的快速增长的成本的能力产生重大影响。

DESCRIPTION (provided by applicant): The objective of this work is to complete development of a novel antibacterial, acute hemodialysis catheter and conduct the preclinical testing required for FDA approval. This product will address 3 major unmet needs for intravenous catheters by: (1) providing dual function coatings that are resistant to both biofilm and thrombus, (2) incorporating antimicrobial technology that will not stimulate the growth of antibiotic resistant bacteria, and (3) improving the duration of antimicrobial activity relative to existing products. The coating is based on a combination of a novel protein resistant block copolymer and an antimicrobial peptide. Coatings will be produced by binding the peptide to surfaces in two modes (via a flexible tether and via entrapment). Recent studies indicate that this is a viable approach based on the peptide's behavior and suggests antimicrobial activity can be maintained when bound to a surface if sufficient solvent accessibility and molecular mobility are preserved. A layer of the antibacterial peptide prepared in this way should be safe, functional, and long-lasting. A key feature of this technology is that it kills bacteria through a multi-tiered mechanism that is fundamentally different from that of clinical antibiotics and is unlikely to cause bacteria to develop resistance. During the proposed period of support, the coating composition and application process will be optimized. Coated catheters will be evaluated for coating efficacy against clinically relevant bacteria strains, durability and mechanical properties to ensure that the coating process developed does not alter the necessary mechanical properties of the catheter. Coating components will be produced under Good Manufacturing Practice (GMPs) and a GMP manufacturing process will be developed and implemented for production of the fully coated and assembled catheter. Preclinical testing required for FDA approval of the coated catheters will also be completed. At the end of this development program, the company will be ready to submit a 510k application and plan to begin post approval clinical testing. The results of this work will have a significant impact on the ability to deliver quality care to both acute and end stage renal disease hemodialysis patients and will decrease their risks of morbidity and mortality due to infections. It will also have a significant impact on the ability to control the rapidly growing cost of treating these patient populations by preventing costly catheter related blood stream infections. PUBLIC HEALTH RELEVANCE: Antibacterial coatings are key to the prevention of medical device related infections, which are a cause of high morbidity and mortality, longer hospital stays, and unnecessary treatment costs. This project aims to develop a new antimicrobial coating technology and apply it to produce an antimicrobial hemodialysis catheter that will prevent biofilms without compromising the efficacy of the limited arsenal of clinical antibiotics. This technology is expected to substantially decrease morbidity and mortality for acute and chronic hemodialysis patients as well as help contain their treatment cost by preventing infections. This research program will potentially yield a solution to the fundamental problem of biofilm formation on medical devices and will be an important step toward responsible infection control.