Pumping system for intravenous administration of a secondary treatment fluid

Claim 1

A secondary pumping system for intravenous infusion of a secondary treatment fluid to a patient in combination with a primary treatment fluid administration set, said primary set having a primary fluid source, a primary fluid control unit and a primary fluid line providing a primary fluid pathway from said primary fluid control unit, said secondary pumping system comprising: a self-contained pumping unit having a secondary fluid reservoir and a secondary fluid pump integrated into a single compartment, wherein said secondary treatment fluid is pumped from said secondary fluid reservoir under the contractive force of a stretched elastic membrane, said elastic membrane forming a wall of said secondary fluid reservoir; a secondary fluid outlet port in said pumping unit; a secondary fluid line having two ends, a first end connected to said secondary fluid outlet port and a second end at a distance therefrom to form a secondary fluid pathway, said secondary fluid pathway mergable with said primary fluid pathway; means for restricting flow through said secondary fluid line; a unitary housing containing said flow restricting means and said pumping unit; a continuous fitting receiving said second end of secondary fluid line and further receiving said primary fluid line to merge said secondary fluid pathway and said primary fluid pathway; and a common fluid line providing a continuous common fluid pathway from said fitting to the patient.