Mouthpiece assembly

AMD 2 Respiratory protective devices - Compressed air line breathing apparatus for use with a full face mask, half mask or a mouthpiece assembly - Requirements, testing, marking (AMD 10774J dated Januai-y 2000. With BS EN 138, BS EN 269 and BS EN 270, superseded BS 4667-3 1974... 

BS7309 Mouthpiece assemblies for respiratory protective devices. 

Fig. 6.47 Respiratory filter for escape with a mouthpiece assembly, partly unpacked (left) and in practical use (right).

As well as mouthpiece assemblies, fuU-face and half masks can be used. Figure 6.48 a shows a typical half mask with a filter for escape. The restrictions for use are the same as those described in Section 6.8.4.I. Combined filters are usually used. 

EN 402 2003 Respiratory protective devices - Lung governed demand self-contained open-circuit compressed air breathing apparatus with fall face mask or mouthpiece assembly for escape — Requirements, testing, marking. 

If the nurse is responsible for administering the medication by nebulization, it is important to place the patient in a location where he can sit comfortably for 10 to 15 minutes. The compressor is plugged in and the medication mixed as directed, or the prepared unit dose vial is emptied into the nebulizer. Different types of medication are not mixed without checking with the physician or the pharmacist. The mask or mouthpiece is assembled and the tubing connected to the compressor. The patient is placed in a comfortable, upright position with the mask over the nose and mouth. The mask must fit properly so that the mist does not flow up into the eyes. If using a mouthpiece instead of a mask, have the patient place the mouthpiece into the mouth. The compressor is turned on and the patient instructed to take slow, deep breaths. If possible, the patient should hold his breath for 10 seconds before slowly exhaling. The treatment is continued until the medication chamber is empty. After treatment, the mask is washed with hot, soapy water, rinsed well, and allowed to air dry. 

A validation program should be developed for the finished assembled package unit. All MDIs in the United States are packaged in one box with the can and mouthpiece preassembled and the canister placed inside the mouthpiece ready for use. A dust cap is provided to cover the end of the mouthpiece, which is in contact with the lips. 

Two types of egg-transfer pipets need to be prepared in advance general transfer pipets and oviduct-transfer pipets. These are made from hard glass capillaries and are assembled into a mouth-operated system made up of a mouthpiece, rubber tube (approximately 60 cm), and a pipet holder (components available from Sigma-Aldrich, A5177). 

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