An irrigation device for injecting fluid into and withdrawing fluid from a body cavity and separating solids from liquid withdrawn from the body cavity, which irrigation device comprises
- (a) a cylindrical housing defining first and second juxtaposed chambers each extending along the length of said housing in the axially elongated direction, said housing defining an open top and bottom end, said housing further defining a cylindrical flange extending outwardly from the cylindrical wall defining said second chamber and having an open end in direct communication with said second chamber, said flange having an axis perpendicular to the axis of said housing and defining a peripheral clamping surface at its open end extending outwardly and parallel to the axis of said housing;
- (b) a cup member axially and removably attached to the open bottom end of said housing and defining a reservoir therein for receiving fluid from said housing;
- (c) a cap member removably attached to the open top end of said housing for closing said top end of said housing;
- (d) a one-way valve assembly provided between said first and second juxtaposed chambers for permitting the flow of fluid through said valve assembly only in the direction from said second chamber to said first chamber;
- (e) a nozzle member integral with said housing for permitting inlet and outlet flow through said first chamber of said housing for fluid within said device;
- (f) a removable, integral gasket and filter member between said housing and said cup member, said gasket and filter member comprising peripheral sealing means for preventing fluid from leaking from said device between said cup member and said housing, said gasket and filter member defining a downwardly tapered orifice for permitting the flow of fluid from said first chamber to said reservoir and for restricting back-flow of fluid from said cup member into said chamber, said gasket and filter member further defining a plurality of filtering apertures radially spaced from said orifice and arranged between said reservoir and said second chamber for preventing solids in the fluid within said reservoir from entering said second chamber;
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- (g) a rolling diaphragm apparatus comprising a cylindrical member defining at one end thereof a radially projecting clamping flange and defining an opening at the other end, and wherein said clamping flange is connected to said peripheral clamping surface of said cylindrical flange of said housing, said cylindrical member being arranged coaxial with said cylindrical flange, said rolling diaphragm further comprising a piston head coaxially arranged within said cylindrical member, and a rolling diaphragm having a flat closed end attached to the side of said piston head facing said housing, said rolling diaphragm further including a radially flared skirt projecting outwardly from said flat closed end and defining a peripheral end formed as an O-ring, said peripheral O-ring end held in compression between said clamping flange of said cylindrical member and said clamping surface of said cylindrical flange of said housing, said flared skirt forming a fluid tight seal with said cylindrical flange for preventing leakage of fluid from said cylindrical housing and said cup member into said cylindrical member of said rolling diaphragm apparatus, said rolling diaphragm apparatus further comprising a piston rod connected to the other side of said piston head and coaxial therewith, said rod projecting outwardly through said open end of said cylindrical member for manually manipulating said piston rod to axially reciprocate said piston rod within said cylindrical member, and in turn, reciprocate said piston head and said rolling diaphragm within said second chamber of said housing, whereupon on the inward stroke of said piston rod, said piston head and rolling diaphragm displaces fluid from said second chamber through said one-way valve assembly into said first chamber, and in turn, further injects fluid into the body cavity through said nozzle member, and alternatively, the outward stroke of said piston rod withdraws said piston head from said second chamber, and in turn, positively draws fluid from the body cavity back through said nozzle member into said first chamber, and further through said restricted orifice into said reservoir, and then draws fluid from said reservoir through said filtering apertures into said second chamber, for further recirculation of fluid through the device and body cavity by alternately introducing at predetermined intervals said piston head in and out of said chamber.