| 主权项 |
1. In combination a burette and an injection port:
said burette having an interior with an inlet via which a first liquid is delivered to the burette interior and an outlet via which an outward liquid is to be delivered to a patient, wherein the first liquid is received from a tube having an end portion connected to a reservoir; said injection port being fixed to the burette, said injection port having:
a body enclosing a port chamber;a first inlet for receiving from the tube the first liquid and to deliver the first liquid to said port chamber;a duct extending from said first inlet, said duct providing a passage between said tube and said first inlet;an injection inlet for receiving a second liquid, from a source external the injection port, into said port chamber and delivering the second liquid to said chamber; andan outlet for delivering the first and second liquids into said interior via the burette inlet; wherein said body enclosing said port chamber is positioned within a cap atop said burette; wherein said injection inlet includes a movable closure member operable to be opened for the delivery of said second liquid to said chamber but urged to a closed position closing said port chamber; and wherein said injection inlet is configured to allow an amount of said first liquid to be drawn from within said port chamber and re-delivered back into said port chamber. |
