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chapter 4
administering medical gases; regulators, flowmeter, and controlling devices
| Term | Definition |
|---|---|
| preset regulators | a device that decreases the pressure from a gas supply system to a determined lower pressure |
| single- stage regulator | a pressure reducing system that lowers primary equipment pressure to working pressure (appr. 50 PSIG) in one step. |
| adjustable, multiple- orifice flow restrictor | uses a series of calibrated openings in a disk that can be adjusted to deliver different flows. |
| adjustable regulators | a valve that allows the user to determine (adjust) pressure limits |
| Boothby-Lovelace-Bulbulian (BLB) mask | an apparatus for administering oxygen; consists of a mask fitted with an inspiratory expiratory valves and a rebreathing bag |
| carbogen | carbon dioxide and oxygen mixture |
| driving pressure | the amount of pressure required to move a fluid through a tube. to maintain a given level of fluid flow through a tube, the driving pressure will increase in proportion to the resistance offered by the tube |
| fixed orifice flow restrictors | the operating pressure is curial to the accuracy of the device |
| flow restrictors | a device that reduced the flow of a fluid/gas out of a system by providing an instream obstruction usually in the form of a orifice of reduced size thus causing back pressure in the system. |
| heliox | low density therapeutic mixture of helium with at least 20% oxygen used in some institution as part of large airway obstruction treatment |
| high flow fixed performance oxygen delivery system | oxygen therapy equipment that supplies inspired gas at a consistent present oxygen concentration also called high flow systems |
| low-flow variable performance oxygen delivery system | oxygen therapy equipment that delivers oxygen at a flow that provides only part of the patients inspired gas needs also called low flow system |
| monoplace hyperbaric chamber | a hyperbaric unit rated for single occupancy |
| multiplace hyperbaric chamber | a walk-in hyperbaric unit that provides enough space to treat two or more patients simultaneously |
| multistage regulators | a pressure reducing valve that has more than one level of pressure reduction between system pressure and working pressure |
| mustache cannula | a type of reservoir nasal cannula that can reduce oxygen supply use from that of a continuous-flow nasal cannula |
| non-pressure compensated | the needle valve is located before the indicator tube. restriction or high resistance devices attached to the outlet of a non pressure compensated Thorpe tube flowmeter create back pressure, which is transmitted back to the needle valve. |
| oxygen adder | simplest example of a oxygen proportioner system consists of two flowmeters, one attached to an oxygen supply and the other attached to an air supply |
| oxygen blender | a devices that mixes oxygen with air or other gases to provide a precise oxygen concentration |
| pendant cannula | a type of reservoir nasal cannula that can reduce oxygen supply use. the reservoir is attached as connecting tubing that is a conduit to a pendant which hangs below the chin. |
| pressure compensated | the most commonly used flowmeters in respiratory care they provide accurate estimates of flow regardless of the downstream pressure |
| pulse demand oxygen delivery system | a system that delivers oxygen to the patient only during inspiration |
| Thorpe tube flowmeters | a type of flowmeter in which the has stream suspends a steel ball in a tapered tube. as the ball obstructs a greater proportion of the cross section of the tapered tube flow is reduced |
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