Circuit for extracorporeal blood treatment and flow-inverting device therein
First Claim
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1. A flow-inverting device for extracorporeal blood treatment circuits comprising:
- a first access being designed to be brought into fluid connection with a patient-side artery branch, a second access being designed to be brought into fluid connection with a patient-side vein branch, a third access being designed to be brought into fluid connection with a unit-side artery branch, a fourth access being designed to be brought into fluid connection with a unit-side vein branch, the first access being in selective fluid communication with either the third access or with the fourth access, and the second access in selective fluid communication with either the fourth access or with the third access;
a one-way passage means interposed between at least two of said first, second, third, or fourth accesses to enable flow in only one direction between said at least two accesses, wherein the one-way passage means includes at least one check valve;
a single pump associated with either the first access or the second access, wherein, in a first work condition of the pump, blood is drawn from a patient'"'"'s cardiovascular system and moved towards the flow-inverting device, and wherein, in a second work condition of the pump, blood is drawn from the flow-inverting device and moved towards the patient'"'"'s cardiovascular system; and
a blood treatment unit in fluid communication with the unit-side artery branch and the unit-side vein branch.
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Abstract
A circuit for extracorporeal blood treatment in which a flow-inverting device is interposed between a blood treatment unit and a blood pump placed on an artery branch connected with a vascular access of a patient. The flow-inverting device allows the blood flow within the filtering unit to be kept unchanged even following an inverted circulation in the patient-side artery and vein branches controlled by the blood pump.
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Citations
16 Claims
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1. A flow-inverting device for extracorporeal blood treatment circuits comprising:
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a first access being designed to be brought into fluid connection with a patient-side artery branch, a second access being designed to be brought into fluid connection with a patient-side vein branch, a third access being designed to be brought into fluid connection with a unit-side artery branch, a fourth access being designed to be brought into fluid connection with a unit-side vein branch, the first access being in selective fluid communication with either the third access or with the fourth access, and the second access in selective fluid communication with either the fourth access or with the third access; a one-way passage means interposed between at least two of said first, second, third, or fourth accesses to enable flow in only one direction between said at least two accesses, wherein the one-way passage means includes at least one check valve; a single pump associated with either the first access or the second access, wherein, in a first work condition of the pump, blood is drawn from a patient'"'"'s cardiovascular system and moved towards the flow-inverting device, and wherein, in a second work condition of the pump, blood is drawn from the flow-inverting device and moved towards the patient'"'"'s cardiovascular system; and a blood treatment unit in fluid communication with the unit-side artery branch and the unit-side vein branch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A flow-inverting device for an extracorporeal blood treatment circuit comprising:
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a first access being designed to be brought into fluid connection with a first section of a patient'"'"'s cardiovascular system, a second access being designed to be brought into fluid connection with a second section of the patient'"'"'s cardiovascular system downstream from said first section, a third access being designed to be brought into fluid connection with a blood inlet of a blood treatment unit of said circuit, a fourth access being designed to be brought into fluid connection with a blood outlet of the blood treatment unit of said circuit, the first access being in selective fluid communication with either the third access or with the fourth access and the second access in selective fluid communication with either the fourth access or with the third access; a flow-rectifier automatically allowing one flow exiting the flow-inverting device through the third access and one flow entering the flow-inverting device through the fourth access irrespective of the direction of the flows at the first access and at the second access, wherein the flow rectifier includes a one-way valve between the first access and the third access, a one-way valve between the first access and the fourth access, a one-way valve between the second access and the fourth access, and a one-way valve between the second access and the third access; and a pump disposed between either the first access and said first section or between the second access and said second section, wherein, in a first work condition of the pump, blood is drawn from the patient'"'"'s cardiovascular system and moved towards the flow-inverting device, and wherein, in a second work condition of the pump, blood is drawn from the flow-inverting device and moved towards the patient'"'"'s cardiovascular system. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification