IMPROVED LARGE-VOLUME BOLUS PATIENT CONTROLLED DRUG ADMINISTRATION DEVICE

摘要

The patient-controlled liquid drug delivery device is a continuous, high volume bolus as well as a continuous flow to self-administer to the patient or to the patient, while avoiding bolus refill before the suction stroke of the pump, but after bolus delivery during bolus delivery Of liquid medicine or both. The apparatus includes an elongated housing having an axial cavity extending through the housing with the reciprocating pump mounted on the lower end. The pump forms a closed inner reservoir and has a first wall or sheet secured within the cavity and a second wall or sheet secured to a fixed wall between the reservoir-full position and the reservoir-And a second flexible wall movable in the axial direction within the cavity. The pump has an inlet port connectable to a source of liquid medicine pressurized by an inlet conduit and an outlet port connectable subcutaneously to the patient by an outlet conduit, both conduits extending outside the lower end of the housing. An exit clamp is mounted within the cavity to move between an open position and a closed position to constrict the outlet conduit of the pump to prevent the flow of liquid medication through the outlet conduit. An inlet clamp is mounted in the cavity to move between a closed position to constrict the outlet conduit to prevent liquid flow and an open position to allow separation of the liquid flow from the inlet conduit.;