Drug delivery cassette

A drug-delivery cassette assembly comprising:

• a) a luer;
• b) tubing having a drug-receiving end which is fluidly-connectable to a drug vial containing a drug and having a drug-delivery end which is fluidly-connected to the luer;
• c) a drug-delivery-cassette main board having a luer-site base portion having a drip chamber disposed to collect any of the drug which exits the luer when the luer is attached to the luer-site base portion, wherein the luer is attachable to and detachable from the luer-site base portion, and wherein the luer-site base portion has a deflectable luer-site sensor beam which is disposed to be deflected by the luer when the luer is attached to the luer-site base portion and to be undeflected when the luer is detached from the luer-site base portion;
• and
• d) a drug-delivery-cassette spike including a drug-vial-seal-perforating spike tip, wherein the spike is attachable to and detachable from the cassette main board.