portion 42 and are formed of a semi flexible material so that they will bend outwardly to accommodate a larger patient diaphragm 32 can be seen as being mounted within the upper shell 18 to the side walls 42 and the front and rear walls 43 the side portions 42 are intended to be secured in adjustable position to the lower shell portion 16 a strip of adhesive tape 45 can be used or the shells may be stapled together outwardly extending flange lip members 46 and 48 may have sealing material 50 mounted thereto and act to provide a tight seal against leakage of air into the interior of the upper shell portion 18 during the suction phase altlernatively a latex sheet may be secured over the shell edges at both the head and foot each ends of the shells and to seal the overlap of top and bottom shells with reference now to fig5 the power and control unit 20 will be described the power control unit 20 is mounted to the upper shell portion 18 by the insertion of the downwardly extending flange portion 27 into the opening or port 28 formed on the upper shell portion 18 the power and control portion 20 consists of an outer housing member 54 that is formed of a plastic and acts to deaden any sounds that come from the power and control unit 20 a plate 56 defines the top of the housing of the power and control unit 20 and also acts to support the handle and various controls a blower assembly 58 and a valve assembly 59 are disposed within the housing blower 58 is mounted within the power and control unit.