Medical devices, namely, medical connectors, intravenous connectors, vascular access connectors, arterial connectors, dialysis connectors, vial access connectors and fluid bag access connectors, and component parts thereof; Medical devices, namely, valves, intravenous infusion valves, check valves, back check valves, stopcocks, enteral valves, anti-siphon valves, y-sites, pump cassettes, fluid conduits, catheters, clamps, burettes, burrette chambers for use with medical devices, medical tubing for the transfer of fluids, medical tubing caps, caps for medical connectors, medical filters, intravenous (IV) bag spikes, drip chambers for use with infusion sets, luers, luer slips, luer locks, luer caps, medical connectors, needleless connectors for the transfer of fluids, adapters for the exchange of fluids and gases, syringes, surgical equipment in the nature of roller clamps, male spin locks, manifolds for the infusion of fluids, and intravenous (IV) start and dressing change kits for the administration of fluids comprised of combinations of the above elements for medical purposes, fluid administration sets comprised of combinations of the above elements for medical purposes, and medical tubing extension sets comprised of combinations of the above elements for medical purposes; Medical devices, namely, protective shields and covers for medical connectors, intravenous connectors, vascular access connectors, arterial connectors, dialysis connectors, vial access connectors, fluid bag access connectors and catheters; Vial access devices and devices for accessing containers for medical fluids, spikes for accessing fluid containers and fluid conduits, contrast counters, gastric lavage system comprised of medical tubing, clamps, valves, connectors, y-sites, fluid bags and component parts thereof, and locking cannula housing for medical use