Patent ID: 6315762
Filing Date: 2001-11-13
Classification: A61M

Abstract:
A system for delivering contrast medium at low pressure to a catheter for delivery to a patient's vascular system comprising:a dual check valve adapted to be connected to a lower pressure source of contrast medium, said dual check valve having an inlet port, an outlet port and an inlet-outlet port,said dual check valve containing a first one-way valve at said inlet port automatically responsive to the relatively low pressure at said inlet-outlet port to permit downstream fluid flow and to prevent upstream fluid flow,said dual check valve containing a second one-way valve at said outlet port automatically responsive to the relatively high pressure at said inlet-outlet port to permit downstream fluid flow and to prevent upstream fluid flow,said inlet-outlet port in communication with said first and second one-way valves and adapted to be connected to a pump,a connecting tubular member having an upstream and a downstream end, said upstream end in communication with said outlet port of said dual check valve,suction at said inlet-outlet port by a pump causing flow of medium from whatever source is coupled to said inlet port through said first one-way valve into the pump, said second one-way valve preventing fluid flow upstream from said connecting tubular member into the pump,positive pressure at said inlet-outlet port from a pump causing fluid flow through said second one-way valve and said outlet port into said tubular member, said first one-way valve preventing upstream fluid flow to a source, anda third one-way valve in communication with said downstream end of said tubular member to permit downstream fluid flow from said tubular member and to prevent upstream fluid flow into said tubular member.