Patent ID: 6315895
Filing Date: 2001-11-13
Classification: A61M,B01D

Abstract:
A dual-stage hemodiafiltration cartridge comprising:a first hemodiafiltration stage including a first housing having first and second ends and first filtering elements disposed between the first and second ends, the first end being associated with a blood inlet which allows flow of blood into a blood-side of said first filtering elements and a first dialysate outlet which allows flow of dialysate out of a dialysate-side of said first filtering elements and the second end being associated with a first dialysate inlet which allows flow of dialysate into a dialysate-side of said first filtering elements;a second hemodiafiltration stage including a second housing having third and fourth ends and second filtering elements disposed between the third and fourth ends, the fourth end being associated with a blood outlet which allows flow of blood out of a blood-side of said second filtering elements and a second dialysate inlet which allows flow of dialysate into a dialysate-side of said second filtering elements and the third end being associated with a second dialysate outlet which allows flow of dialysate out of the dialysate-side of said second filtering elements; andan inter-stage connector connected to the second end of the first housing and to the third end of the second housing and adapted to allow flow of blood from the blood side of the first filtering elements to the blood-side of the second filtering elements and flow of dialysate fluid therethrough from the second stage to the first stage,wherein said inter-stage connector has a header space in communication with the blood-side of the first filtering elements and with the blood-side of the second filtering elements, the inter-stage connector having a substitution-fluid inlet which allows flow of substitution fluid into said header space thereby to dilute the blood in said header space.