METHOD OF INITIALISING AN APPARATUS FOR BLOOD TREATMENT IN THE SINGLE-NEEDLE MODE AND APPARATUS FOR BLOOD TREATMENT IN THE SINGLE-NEEDLE MODE
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Abstract
An apparatus and method for blood treatment for the single-needle mode, the apparatus having an extra-corporeal blood circuit with a blood infeed line running to the inlet and a blood return line leading away from the outlet, of a blood treating unit, includes in the blood return line a device, e.g., container, for amassing blood, which is in flow-permitting connection for gas transfer with a device, e.g., container, for storing gas. A pressure is calculated and set in the device for storing gas before the arterial and venous phases are started, with two constraints. First, the pressure should be sufficiently low to ensure both no infusion of air into the patient and also regulated flow of blood into the patient even at opposing pressures lower than ambient pressure. Second, the pressure should be sufficiently high to expel blood from the device for amassing blood into the device for storing gas.
8 Citations
40 Claims
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1-20. -20. (canceled)
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21. A method of initialising a blood-treatment apparatus for single-needle mode, comprising:
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during an arterial phase, making a connection between a device for amassing blood which encloses a sealed-off volume of space and a device for storing gas which encloses a sealed-off volume of space and feeding blood to the device for amassing blood, gas which is expelled from the sealed-off volume of space in the device for amassing blood being transferred to the device for storing gas, thus causing a pressure to be generated in the device for storing gas; and during a venous phase, making a connection between the device for storing gas and the device for amassing blood, and gas which has been stored in the device for storing gas is transferred to the device for amassing blood, thus expelling the blood which is contained in the sealed-off volume of space in the device for amassing blood, an ongoing changeover being made between the arterial phase in which the device for amassing blood is filled with blood to an upper changeover point and the venous phase in which the device for amassing blood is emptied to a lower changeover point, thus causing blood to be fed to the extra-corporeal blood circuit in the arterial phase and blood to be extracted from the extra-corporeal blood circuit in the venous phase; wherein, for initialisation of successive arterial and venous phases, a pressure pAir reservoir max. which is to be set in the device for storing gas is calculated and, for the initialisation, the pressure pAir reservoir max. previously calculated is set in the device for storing gas before the arterial and venous phases are started. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. An apparatus for blood treatment for single-needle mode, comprising:
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a device for amassing blood which encloses a sealed-off volume of space; a device for storing gas which encloses a sealed-off volume of space; a device for making a connection between the device for amassing blood and the device for storing gas; a device for feeding blood to the device for amassing blood in an extra-corporeal blood circuit, the extra-corporeal blood circuit having a blood infeed line which runs to an inlet of a blood-treating unit and a blood return line which leads away from an outlet of the blood-treating unit; a device for compressing gas; and a control and calculating unit which co-operates with the device for amassing blood, with the device for storing gas, with the device for making a connection between the device for amassing blood and the device for storing gas and with the device for compressing gas such that, in an arterial phase when the device for amassing blood is being filled, gas which is expelled from the device for amassing blood is transferred to the device for storing gas and, in a venous phase for emptying the device for amassing blood, gas which has been stored in the device for storing gas is transferred to the device for amassing blood by the device for compressing gas, blood thus being able to be transferred to the extra-corporeal blood circuit in the arterial phase and to be extracted from the extra-corporeal blood circuit in the venous phase, wherein the control and calculating unit is configured such that, for initialisation of successive arterial and venous phases, a pressure pAir reservoir max. which is to be set in the device for storing gas is calculated and, for the initialisation, the pressure pAir reservoir max. previously calculated is set in the device for storing gas before the arterial and venous phases are started and, on the pressure being set, the arterial and venous phases are started. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification