乌克兰采购需求：制氧机、制氧机、病人监护仪、中央监护系统、脉搏血氧仪、白细胞分析仪

I'm looking for a replacement inner filter for my oxygen concentrator, specifically the 10L Dual model. I've been searching around and haven't had much luck finding a reliable source for this part. I would appreciate any information on whether it's possible to purchase the inner filter separately and if so, where I can find it. If you have these filters in stock or can point me in the direction of a supplier, that would be fantastic. I'm eager to get my device up and running again as soon as possible, so any help or guidance you can provide would be greatly appreciated. Thanks in advance for your assistance!