Pumps – Motor driven – Fluid motor
Patent
1977-04-20
1982-09-21
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
417385, 417389, 417478, 91 50, F04B 4506
Patent
active
043504779
ABSTRACT:
A portable pumping system for administering fluids intravenously to a patient. The system has a tube connected between the fluid source and the patient with one-way valves at each end of the tube to limit the flow to one direction. A middle portion of the tube is positioned within a first chamber that is connected by a hose to a second chamber. The second chamber has a flexible member that is reciprocally moved by an arrangement that includes a housing and a source of compressed gas. The housing has a valved inlet and outlet and the flexible member forms a portion of the boundary of the housing. The valve for the outlet of the housing is attached to the flexible member which is a metallic disc inherently biased in a concave shape in relation to the housing. In operation, the flexible member inverts to a convex shape as pressure increases within the housing emitting a click. At a predetermined point, the valve attached to the flexible member vents the housing and the flexible member reverts to its concave shape emitting another click. Means are also provided to flush out the air within the enclosing means defined by the first and second chambers and connecting hose as are means for selectively increasing or decreasing the pressure within the enclosing means.
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Carson W. Scott
Smith Leonard E.
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