with aspiration vent line 124 is pressure sensor 126 which may be one of a variety of invasive or non invasive pressure sensors well known in the art extending from vent line 134 is aspiration vent line 132 which fluidly connects to aspiration vent line 124 through vent valve 130 aspirant or exhaust from pump mechanism 116 is directed into vent line 132 through aspiration exhaust line 134 but is prevented from entering line 124 by valve 130 exhaust line 134 empties into waste bag 40 which may vent waste bag 140 to atmosphere through vent line 136 which may contain antimicrobial filter 38 as discussed above while it is preferred that pump mechanism 116 be a peristaltic roller head and aspiration line 120 and aspiration exhaust line 134 be formed in one continuous length so as to form a peristaltic pump tube that interacts with pump mechanism 116 one skilled in the art will recognize that aspiration line 120 and aspiration exhaust line 134 may be formed as a separate piece or pieces or may be formed integrally with cassette 114 and that pump mechanisms 116 other that peristaltic pump roller heads may be used such as linear peristaltic pumps in addition pressure sensor 126 is depicted as being contained within console 112 one skilled in the art will recognize that portions of pressure sensor 126 such as a pressure.