Patent ID: 7384543
Filing Date: 2008-06-10
Classification: A61M,Y10T

Abstract:
1. A circuit for extracorporeal blood treatment comprising: at least one blood treatment unit; at least one unit-side artery branch and at least one unit-side vein branch connected with the treatment unit; at least one patient-side artery branch and at least one patient-side vein branch designed to be put into fluid communication with a patient's vascular access; at least one device for flow inversion in connection with said unit-side artery branch and vein branch and with said patient-side artery branch and vein branch, said inverting device allowing at least one direct operating condition of fluid connection between the patient-side artery branch and the unit-side artery branch and an inverted operating condition of fluid connection between the patient-side vein branch and the unit-side artery branch; and movement means to generate a flow in said patient-side artery and vein branches and said unit-side artery and vein branches, wherein at least part of said flow-inverting device is interposed in circuit between said movement means and blood treatment unit and is capable of maintaining the flow direction in the unit-side artery and vein branches unchanged both in its direct operating condition and its inverted operating condition, said flow-inverting device having at least four accesses, a first access being brought into fluid connection with the patient-side artery branch, a second access being brought into fluid connection with the patient-side vein branch, a third access being brought into fluid connection with the unit-side artery branch, a fourth access being brought into fluid connection with the unit-side vein branch, the first access being selectively in fluid communication either with the third access or with the fourth access and the second access being selectively in fluid communication either with the fourth access or with the third access; and one-way passage means interposed between at least two of said accesses to enable flowing in one direction alone between said two accesses.