Bacteria filters with transparent housings

Claim 1

A bacteria filter for use in anesthesiology and respiratory air systems to filter fluid flow at a desired point in a system comprising: an enlarged electrically non-conductive, transparent tubular housing having a passageway therethrough and having at one end a reduced tip; an electrically conductive connector mounted to the reduced tip; an electrically conductive end cap affixed to the end of the housing distal from the reduced tip; the end cap having an opening therethrough terminating in a projecting end cap connector; a filter element mounted in the housing; an electrically conductive portion extending between the end cap and the electrically conductive connector to provide an electrically conductive pathway from end to end of the filter including the space occupied by the transparent housing; the connector and the projecting end cap connector being adapted to be mounted within a fluid flow system to permit fluid communication with the interior of the housing so that fluid flowing through the system passes in one end of the housing, through the filter element and out of the other end; the connector, the housing and the end cap being arranged in a series relationship with means between the connector and the projecting end cap providing a fluid flow from said system through one end of the housing, through the filter element and out of the other end and the electrically conductive portion being a conductive strip extending from end to end of the series relationship and being mounted entirely on the interconnected housing, connector, and end cap independent of external supporting structure; the conductive portion extending between the end cap and the conductive connector being a porous cylinder of conductive material adapted to support a filter element and having one end in direct contact with the electrically conductive end cap; the end of the tubular housing containing the reduced tip being in the form of a funnel-shaped conductive member with the wider end of the funnel containing a central conductive disc to support the cylinder and being in electrical contact therewith; the disc being supported by a plurality of spaced spokes of conductive material extending between the disc and the walls of the funnel.