Importance

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Abstract

An injection system and method for delivering fluids to a subcutaneous body site such as an analgesic to the ventricle is disclosed. A reservoir containing a plurality of doses of the fluid is adapted to be subcutaneously located in the abdomen. This reservoir is connected by a catheter to a subcutaneous unit containing a valve and a pump. This unit is then connected to the ventricle of the user. By the simultaneous actuation of the valve and the pump, the analgesic is pumped to the ventricle of the user. Preferably, the reservoir includes an expandable bag and a bubble member on the outermost surface of the bag which is penetrable by a small needle on the outersurface and impenetrable on the innersurface. A fluid passageway then connects the bag and the bubble member so that the bag is easily refilled. The pump and valve are preferably operated by flexible portions on the subcutaneous unit, which flexible portions are preferably recessed to prevent inadvertent actuation. A tap reservoir provided on the catheter leading to the ventricle is also preferably provided in order to inject additional fluids to flush the system or to sample the fluids in the ventricle.

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First Claim