Single-needle circuit for circulating blood outside the body in

Details Single-needle circuit for circulating blood outside the body in Single-needle circuit for circulating blood outside the body in

1991-08-09

1993-07-13

Dawson, Robert A.

Liquid purification or separation

Flow, fluid pressure or material level, responsive

210 86, 210 87, 210 90, 210104, 210134, 210137, 210143, 2101952, 604 4, 604 5, B01D 6100, A61M 100

Patent

active

052270491

ABSTRACT:
A blood treatment apparatus having a circuit for circulating blood outside the body and designed to be connected to a patient via a single needle, including a blood treatment device such as a heamodialyzer, pumps for causing blood to flow through the circuit, a first blood expansion chamber located in the circuit upstream of the blood treatment device for temporarily storing a volume of blood to be treated, a second blood expansion chamber located downstream of the blood treatment device for temporarily storing a volume of treated blood, first and second pressure regulators, connected to the first and second blood expansion chambers, for adjusting pressure in the blood expansion chambers, and a controller for interacting with the regulators to maintain a substantially constant pressure in each of the first and second chambers during a treatment session.

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patent: 4935125 (1990-06-01), Era et al.
patent: 4997570 (1991-03-01), Polaschegg

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