An administration set that stops when removed from the infusion device, yet allows gravity fl ow when the user manipulates the regulatory mechanism. Aseptic technique: Mechanisms employed to reduce potential contamination. Bacteria: Microorganisms that may be non -pathogenic (normal fl ora) or pathogenic (disease -causing). Bolus: Concentrated medication and/or solution given rapidly over a short period of time. Cannula: Hollow tube made of Silastic, rubber, plastic or metal, used for accessing

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... the body. Catheter: Tube for injecting or evacuating fl uids. Catheter dislodgement: Movement of the catheter into and out of the insertion site. Causes of catheter dislodgement include inappropriate securement of the catheter, and motion of the extremity, neck or shoulder. Catheter dislodgement may cause occlusion of the catheter and lead to a change in the catheter tip location. Signs and symptoms of catheter dislodgement include changes in the external length of the catheter, clinical signs of local catheter infection, and inability to fl ush or infuse via the catheter. Chemical incompatibility: Change in the molecular structure or pharmacological properties of a substance that may or may not be visually observed. Closed system: Administration system with no mechanism for external entry after initial set -up and assembly. Compatibility: Capability to be mixed and administered without undergoing undesirable chemical and/or physical changes or loss of therapeutic action.