초록 ▼

A disposable single-needle extracorporeal blood treatment circuit for such treatments of blood hemofiltration, plasma filtration, detoxification and alike includes a manually operated syringe attached to a proximal bifurcation and a patient's access port attached to a distal bifurcation. Both bifurc

A disposable single-needle extracorporeal blood treatment circuit for such treatments of blood hemofiltration, plasma filtration, detoxification and alike includes a manually operated syringe attached to a proximal bifurcation and a patient's access port attached to a distal bifurcation. Both bifurcations are connected with each other by a withdrawal line and in parallel by a treatment loop including a blood treatment unit and an air removal element. In the first embodiment, one or two three-way valves (such as stop-cocks) are positioned at these bifurcations to allow directing the flow of blood from the patient to the syringe through the withdrawal line and redirecting the flow through the treatment loop when blood is being returned to the patient from the syringe. In a second embodiment, two check valves are positioned along said withdrawal line and said treatment loop to automatically direct the blood floe in the same manner. Additional flush and drain circuits are optionally included allowing a “stand-by” mode of operation.

대표청구항 ▼

1. A manually operated single-needle circuit for extracorporeal treatment of blood comprising: a displacement pump configured to be manually operated to cause blood flow,a withdrawal line,a treatment loop including a blood treatment element,a proximal bifurcation connected to said pump, said withdra

1. A manually operated single-needle circuit for extracorporeal treatment of blood comprising: a displacement pump configured to be manually operated to cause blood flow,a withdrawal line,a treatment loop including a blood treatment element,a proximal bifurcation connected to said pump, said withdrawal line and said treatment loop,a distal bifurcation connected to said withdrawal line, said treatment loop and configured to be connected to a single needle for withdrawal and return of blood from a patient, anda flow directing means to direct the blood flow through said withdrawal line in a direction from said patient into said pump while isolating said treatment loop during withdrawal of said blood from said patient to said pump, said flow directing means further adapted to direct the blood flow in a direction from said pump to said patient through said treatment loop while isolating said withdrawal line during return of said blood from said pump to said patient. 2. The circuit as in claim 1, wherein said treatment loop further comprising an air removal element. 3. The circuit as in claim 1, wherein said flow directing means comprise a manually operated three-way valve at said distal bifurcation. 4. The circuit as in claim 1, wherein said flow directing means comprise a manually operated three-way valve at said proximal bifurcation. 5. The circuit as in claim 1, wherein said pump is a syringe. 6. The circuit as in claim 1, wherein said flow directing means comprise a first check valve positioned in said withdrawal line and oriented to allow said blood flow only in the direction from said distal bifurcation to said proximal bifurcation, said flow directing means further including a second check valve positioned in said treatment loop and oriented to allow said blood flow only in the direction from said proximal bifurcation to said distal bifurcation. 7. The circuit as in claim 1 further including a flush three-way valve located between said pump and said proximal bifurcation, said flush valve allowing connecting a flush fluid reservoir to said circuit. 8. The circuit as in claim 1 further including a drain three-way valve located between said distal bifurcation and said patient, said drain valve allowing connecting a drain fluid reservoir to said circuit. 9. A manually operated disposable single-needle circuit for extracorporeal treatment of blood comprising: a syringe,a withdrawal line,a treatment loop including a blood treatment unit and an air removal element,a proximal bifurcation connected to said syringe, said withdrawal line and said treatment loop, said proximal bifurcation containing a first three-way stop-cock valve,a distal bifurcation connected to said withdrawal line, said treatment loop and configured to be connected to a single needle for withdrawal and return of blood from a patient, said distal bifurcation containing a second three-way stop-cock valve,wherein said first and said second three-way stop-cocks are adapted to direct the blood flow through said withdrawal line in a direction from said patient into said syringe during blood withdrawal while isolating said treatment loop, said first and said second three-way stop-cocks adapted also to direct the blood flow through said treatment loop in a direction from said syringe to said patient while isolating said withdrawal line during return of said blood to said patient. 10. The circuit as in claim 9, wherein said blood treatment unit is a mass-exchange filter. 11. The circuit as in claim 9, wherein said blood treatment unit is a hemofiltration filter. 12. The circuit as in claim 9, wherein said blood treatment unit is a plasma filtration filter. 13. The circuit as in claim 9, wherein said air removal element is a drip chamber. 14. The circuit as in claim 9, wherein said air removal element is a bubble trap.