Apparatus for Controlling Blood Flow in an Extracorporeal Circuit
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Accused Products
Abstract
The apparatus for blood flow control in an extracorporeal circuit comprises: a user interface for setting a desired blood flow value (qbREAL) and a datum relating to the vascular access, a memory for recording a plurality of mathematical relations having mathematical expressions relating to the vascular access organ to be used, and a control unit. The control unit identifies the vascular access, selects, from among the plurality of mathematical relations present in the memory, a relation which corresponds to the vascular access identified, and calculates, as a mathematical function of the set value for the desired flow (qbREAL), a value at which to set the angular velocity of the pump associated to the extracorporeal circuit and/or a theoretical value of the arterial pressure upstream of the pump.
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Citations
33 Claims
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1-18. -18. (canceled)
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19. A blood treatment machine comprising:
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an extracorporeal circuit having at least a blood treatment unit, at least an access branch extending between a blood removal zone of a patient and the treatment unit, at least a return branch extending between the treatment unit and a blood return zone to the patient, at least a vascular access organ interpositioned between said branches and a patient'"'"'s vascular system, and at least a pump associated to the extracorporeal circuit, and an apparatus for controlling blood flow in the extracorporeal circuit, the apparatus comprising; at least a user interface for enabling a setting of a desired value of blood flow (qbREAL) through the access branch and in order to allow entry of at least a datum relating to the vascular access; a memory storing a plurality of mathematical relations, each of said mathematical relations having a respective mathematical expression which is a function of the vascular access organ to be used and mathematically linking the blood flow through the access branch with an angular velocity of the pump; a control unit, connected to the user interface and the pump, which control unit is programmed for performing a process as follows; identifying the vascular access; selecting, from among the plurality of mathematical relations present in the memory, the mathematical relation which corresponds to the identified vascular access; calculating, using the mathematical relation loaded from said memory, at least one from following values; a value at which the angular velocity of the pump can be set as a function of a set value for a desired flow (qbREAL), and a theoretical value of the arterial pressure in the arterial branch upstream of the pump, as a mathematical function of the set value for the desired flow (qbREAL). - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification