Medical device for treating decompensated heart failure

Medical device systems and methods for making and using medical device systems are disclosed. An example medical device system includes a control system having a processor (16) and a pump (18), a first expandable member coupled to the processor (16) and configured to be located in a superior vena cava (36). The system also includes a second expandable member coupled to the processor (16) and configured to be located in the inferior vena cava (38). The system further comprises a first sensing member (32a) designed to sense a first parameter. The system further comprises a second sensing member (32b) designed to sense a second parameter. Further, the pump (18) is designed to expand or contract the first expandable member (128, 228, 28A, 328A), the second expandable member (129, 229, 28B, 328B), or both, based on a change in the first parameter, the second parameter, or both. 本发明公开了医疗装置系统和用于制备和使用医疗装置系统的方法。实例医疗装置系统包括具有处理器(16)和泵(18)的控制系统、联接至处理器(16)并配置成位于上腔静脉(36)中的第一可扩张构件。系统还包括联接至处理器(16)并配置成位于下腔静脉(38)中的第二可扩张构件。系统还包