We report a new technique to replace a manufactured poly(methyl methacrylate) (PMMA) ring with a biologic stromal ring fashioned from human corneal donor tissue in eyes with stromal melting above the PMMA ring. The biologic stromal ring is prepared using manual or femtosecond laser trephination of a donor cornea to obtain a 360-degree ring that is denuded and adjusted to match the PMMA ring being replaced. The biologic ring is attached to the PMMA ring. The PMMA ring is pushed and retrieved from the other side, which installs the biologic ring in place. Six biologic stromal rings were implanted successfully in 5 eyes of 5 patients with previous stromal melting; no complications were reported up to 6 months postoperatively. The biologic stromal ring stopped and healed the melting, prevented further ring complications, and preserved the therapeutic refractive effect of the previously implanted PMMA ring.

中文翻译：

---

生物基质环管理基质内角膜环段植入后的基质融化。

我们报告了一种新技术，用生物基质环取代人造聚甲基丙烯酸甲酯（PMMA）环，该基质环是由人角膜供体组织在PMMA环上方的基质融化而成的。使用供体角膜的手动或飞秒激光脱色处理来制备生物基质环，以获得360度环，将环裸开并调整以匹配要更换的PMMA环。生物环连接到PMMA环。从另一侧推动并取回PMMA环，从而将生物环安装到位。在先前有基质融化的5例患者的5只眼中，成功植入了6个生物基质环。术后6个月无并发症报告。生物基质环停止并愈合融化，防止了进一步的环并发症，