A fluid filled type vibration damping device having a pressure-receiving chamber and an equilibrium chamber disposed on either side of a partition member. The composite metal oxide is represented by the following formula: NaxFeyMn1-yO2. In accordance with one aspect of the invention, several observation units and associated lighting sources are integrated in each measuring head. or nth medication contained in the independent chambers or reservoirs coupled to the pump; and a catheter having two or more reservoir-specific inlet ports directed into respective lumens of the catheter.