The present invention relates to a holder (101, 102, 103) for releasably holding or mounting at least one external medical module (301), e.g. a blood filter, at or to a medical treatment apparatus (200), in particular to a blood treatment apparatus, wherein the holder (101, 102, 103) comprises at least a first reception unit (101a, 102a) and a second reception unit (101b, 102b).本發明有關一夾具(101、102、103)，係以可脫離的方式將至少一外部醫療模組(301)，例如一血液過濾器，夾固或安裝於或至一醫療設備(200)，尤其是一血液處理設備；其中該夾具(101、102、103)包括至少一第一容置單元(101a、102a)與一第二容置單元(101b、102b)。
