Patent ID: 8603034

Claim:
A fluid reservoir assembly for engaging a pump, the pump having a housing, a reservoir chamber, a threaded, cylindrical reservoir housing chamber opening having a sealing member, and a piston to act on the fluid reservoir assembly when the fluid reservoir assembly is in the reservoir chamber, the fluid reservoir assembly comprising: a one-piece barrel, the one-piece barrel including a cylindrical barrel portion having a barrel diameter and having a first open end and a second end, a male luer fitting integral with the second end of the barrel portion, the male luer fitting having an opening at a removed end thereof, the one piece barrel including a neck portion integral with the barrel portion, the neck portion including integral threads dimensioned to engage the threads of the reservoir housing chamber opening, the one piece barrel including a cylindrical sealing surface radially outward of the neck portion threads and configured to lay adjacent the interior of the reservoir housing chamber opening of the pump housing and engage the sealing member, the cylindrical sealing surface integral with the neck; a plunger dimensioned for slideable receipt into the open end of the one-piece barrel; wherein the one-piece barrel further includes walls, the walls defining a port, the port dimensioned and located on the one-piece barrel such that the interior of said housing is vented when said fluid reservoir assembly is engaged therewith and said cylindrical sealing surface is laying adjacent in fluid sealing relation to the housing chamber opening in airtight engagement; wherein the port is substantially covered with a filter medium capable of filtering water from a gas and allowing the passage of the gas therethrough; and further comprising a wall extending from an external surface of the port and substantially surrounding the port, wherein the port is covered with the filter medium adjacent the external surface.