Abstract: An infusion rate adjusting device for drug solution injectors comprises a tubular flow control unit including plural check valves of different opening pressures, and means for selecting one of said check valves to adjust an infusion rate of the drug solution. The infusion rate adjusting device is simple in operation to set out an infusion rate of the drug solution and is considerably reduced in the production cost.

Abstract: An adapter for mixing and injection of preparations comprises a cylindrical vial-fitting portion (1), a puncture needle (2) and a tubular tip-fitting portion (3). The vial-fitting portion (1) includes a top wall (11) and a skirt (12). The puncture needle (2) is passed through the top wall (11) and is integrated therewith. The tip-fitting portion (3) is arranged coaxially to the puncture needle (2) on the opposite side thereof to the top wall (11). The puncture needle 2 has a cutting edge 21 on the side of the skirt (12) and is provided at a proximal end thereof with a connecting portion (22) for engagement with the tip-fitting (23), which communicates with a lumen (32) of the tip-fitting portion (3) and is open to the cutting edge (21). A filter (4) is arranged in the liquid passage (231) of the connecting portion (22).