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The impactor assembly of the MFP device. The impactor assembly consists of three components: the pneumatic cylinder, which relays the pressurized air; the pressure chamber (9 inches long), which is filled with sterile isotonic fluid (saline) and bears a piston on top that transfers the impact energy to the fluid; and a male locking Luer fitting (made from plastic) that ensures tight connection with the female Luer disc (made from steel or plastic) cemented on the skull of the rat.
