element 42 defines a boundary between a central volume 50 a enclosed by the filter and an exterior generally annular shaped sealed volume defined between the filter and the outer container the cylindrical filter element 42 is fixed as by cementing at top and bottom to rubber flange disks 43 and 44 respectively best shown in fig2 these may be formed of a silicone rubber about u00bc inch thick the top disk 43 has openings 45 and 46 which receive air outlet conduit 47 and an air plus particle inlet conduit 49 conduits 47 and 49 are fused or otherwise sealingly connected to openings in disk 43 conduits 47 and 49 may be flexible plastic tubes with o d 39 s of u215c and u00bc inch respectively the disks 43 and 44 are press fitted into the inner diameter of can 41 and can be glued to the can interior they form the sealed annular chamber 50 b which surrounds filter 42 and communicates with conduit 47 while filter 42 element is shown as a rigid filter fixed between rubber disks 43 and 44 it can be replaced by a simple filter bag suitably clamped to input conduit 49 see fig1 in operation waste particles and tissue flow from the handpiece and into filter 42 element and are.