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Parenteral Medications


the graduated tubular outer portion of the syringe; he outer wall of the barrel has a scale calibrated in mL's or minims and the inner wall must remain sterile


the distal, tapered open end of the shaft of the needle; must remain sterile


the diameter of the needle lumen


the junction between the hub and shaft; must remain sterile


the wide base portion of the needle that fits over the syringe tip


the distal end of the plunger; the only part of the plunger which can be touched in order to maintain sterility


the hollow inside diameter of the shaft of a needle

needle guard

cap that protects the needle and helps maintain sterility

prefilled medication cartridge

commercially prepared single dose medication that has a needle permanently attached to a calibrated barrel


the solid inner movable portion of a syringe that is pushed within the barrel, via the knob, to administer liquid medication

safety syringes

syringe that comes with the needle already attached and is equipped with a retraction device that retracts the needle into the syringe once the injection is complete


the long, cylindrical hollow tube of the needle


the small end of the syringe that fits into the needle hub when assembling the needle and syringe together; it must remain sterile


glass or plastic container that has a self-sealing rubber stopper

deltoid muscle

allows only small amounts of medication to be injected; avoid hitting the humerus

vastus lateralis

muscle located on the anterior lateral aspect of the thigh

rectus femoris

located on the anterior lateral aspect of thigh

ventrogluteral muscle

located on the side of the hip, just below the iliac crest

dorsogluteal muscle

located in the upper, outer quadrant of the gluteal muscle

air lock technique

clears the needle of medication and seals the track so that the medication does not flow back into the subcutaneous tissue

z-track method

reduces pain caused by irritating drugs that leak or escape along the track into the subcutaneous tissue when the needle is withdrawn

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