Device for calculating blood flow in an extracorporeal blood circuit, and an apparatus for treatment of blood using the device
First Claim
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1. An apparatus for extracorporeal blood treatment, comprising:
- at least one blood treatment unit having a first chamber and a second chamber separated by a semi-permeable membrane;
an extracorporeal circuit for circulation of blood, said extracorporeal circuit comprising a blood removal branch and a blood return branch, said blood removal branch having an end destined to be connected with a cardiovascular system of a patient and another end in communication with an inlet of said first chamber, said blood return branch having an end destined to be connected to a cardiovascular system of a patient and another end in communication with an outlet of said first chamber;
first movement means operating on a post-infusion tract of said blood removal branch, said first movement means causing a flow of liquid across said extracorporeal circuit;
an infusion line connected to said blood removal branch at a section thereof located upstream of said post-infusion tract with reference to a blood circulation direction of blood in said extracorporeal circuit;
second movement means operating on said infusion line for causing a flow of infusion liquid across the infusion line;
a blood flow calculation device comprising;
a memory for receiving and storing a first datum or a second datum and for receiving and storing a third datum, said first datum relating to a flow of blood removed from the patient, said second datum being the flow of liquid across said post-infusion tract, and said third datum relating to a flow of infusion liquid flowing through said infusion line;
first sensor means predisposed to emit a first signal relating to an actual value of the flow of liquid across said post-infusion tract;
a user interface predisposed to receive in input said first datum, said first datum comprising a set value of the blood flow removed from the patient; and
a control unit connected to said memory and to said user interface, said control unit being programmed to calculate said second datum as a function of said first datum and said third datum,said control unit being connected to said first sensor means,said control unit being programmed to cooperate with the first and second movement means for bringing the actual value of the flow of liquid across said post-infusion tract towards a set value of the flow of liquid across the same post infusion tract or towards said calculated second datum.
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Abstract
The invention relates to a device for calculating blood flow and to an apparatus for extracorporeal blood treatment provided with the device. The device includes a memory for receiving and storing either a first datum relating to a blood flow removed from the patient Qb, or a second datum relating to a flow of liquid Qt crossing a tract of the extracorporeal circuit, and a third datum relating to a flow of infusion liquid Qinf flowing through the infusion line. The device also comprises a control unit able to calculate the first datum or the second datum as a function of the third datum relating to the flow of infusion liquid Qinf.
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Citations
23 Claims
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1. An apparatus for extracorporeal blood treatment, comprising:
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at least one blood treatment unit having a first chamber and a second chamber separated by a semi-permeable membrane; an extracorporeal circuit for circulation of blood, said extracorporeal circuit comprising a blood removal branch and a blood return branch, said blood removal branch having an end destined to be connected with a cardiovascular system of a patient and another end in communication with an inlet of said first chamber, said blood return branch having an end destined to be connected to a cardiovascular system of a patient and another end in communication with an outlet of said first chamber; first movement means operating on a post-infusion tract of said blood removal branch, said first movement means causing a flow of liquid across said extracorporeal circuit; an infusion line connected to said blood removal branch at a section thereof located upstream of said post-infusion tract with reference to a blood circulation direction of blood in said extracorporeal circuit; second movement means operating on said infusion line for causing a flow of infusion liquid across the infusion line; a blood flow calculation device comprising; a memory for receiving and storing a first datum or a second datum and for receiving and storing a third datum, said first datum relating to a flow of blood removed from the patient, said second datum being the flow of liquid across said post-infusion tract, and said third datum relating to a flow of infusion liquid flowing through said infusion line; first sensor means predisposed to emit a first signal relating to an actual value of the flow of liquid across said post-infusion tract; a user interface predisposed to receive in input said first datum, said first datum comprising a set value of the blood flow removed from the patient; and a control unit connected to said memory and to said user interface, said control unit being programmed to calculate said second datum as a function of said first datum and said third datum, said control unit being connected to said first sensor means, said control unit being programmed to cooperate with the first and second movement means for bringing the actual value of the flow of liquid across said post-infusion tract towards a set value of the flow of liquid across the same post infusion tract or towards said calculated second datum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An apparatus for extracorporeal blood treatment, comprising:
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at least one blood treatment unit having a first chamber and a second chamber separated by a semi-permeable membrane; an extracorporeal circuit for circulation of blood, said extracorporeal circuit comprising a blood removal branch and a blood return branch, said blood removal branch having an end destined to be connected with a cardiovascular system of a patient and another end in communication with an inlet of said first chamber, said blood return branch having an end destined to be connected to a cardiovascular system of a patient and another end in communication with an outlet of said first chamber; first movement means operating on a post-infusion tract of said blood removal branch, said first movement means causing a flow of liquid across said extracorporeal circuit; an infusion line connected to said blood removal branch at a section thereof located upstream of said post-infusion tract with reference to a blood circulation direction of blood in said extracorporeal circuit; second movement means operating on said infusion line for causing a flow of infusion liquid across the infusion line; and a blood flow calculation device comprising; a memory for receiving and storing a first datum or a second datum and for receiving and storing a third datum, said first datum relating to a flow of blood removed from the patient, said second datum being the flow of liquid across said post-infusion tract, and said third datum relating to a flow of infusion liquid flowing through said infusion line; first sensor means predisposed to emit a first signal relating to an actual value of the flow of liquid across said post-infusion tract; a user interface predisposed to receive in input said first datum, said first datum comprising a set value of the blood flow removed from the patient, and said third datum comprising a set value of the flow of infusion liquid lowing through said infusion line, and said blood flow calculation device further comprising a control unit connected to said memory and to said user interface, said control unit being programmed to calculate said second datum as a function of said first datum and said third datum, said control unit being connected to said first sensor means, said control unit being programmed to cooperate with the first and second movement means for bringing the actual value of the flow of liquid across said post-infusion tract towards a set value of the flow of liquid across the same post infusion tract or towards said calculated second datum.
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23. An apparatus for extracorporeal blood treatment, comprising:
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at least one blood treatment unit having a first chamber and a second chamber separated by a semi-permeable membrane; an extracorporeal circuit for circulation of blood, said extracorporeal circuit comprising a blood removal branch and a blood return branch, said blood removal branch having an end destined to be connected with a cardiovascular system of a patient and another end in communication with an inlet of said first chamber, said blood return branch having an end destined to be connected to a cardiovascular system of a patient and another end in communication with an outlet of said first chamber; first movement means operating on a post-infusion tract of said blood removal branch, said first movement means causing a flow of liquid across said extracorporeal circuit; an infusion line connected to said blood removal branch at a section thereof located upstream of said post-infusion tract with reference to a blood circulation direction of blood in said extracorporeal circuit; second movement means operating on said infusion line for causing a flow of infusion liquid across the infusion line; and a blood flow calculation device comprising; a memory for receiving and storing a first datum or a second datum and for receiving and storing a third datum, said first datum relating to a flow of blood removed from the patient, said second datum being the flow of liquid across said post-infusion tract, and said third datum relating to a flow of infusion liquid flowing through said infusion line; first sensor means predisposed to emit a first signal relating to an actual value of the flow of liquid across said post-infusion tract; and a user interface predisposed to receive in input said first datum, said first datum comprising a set value of the blood flow removed from the patient, said user interface being also predisposed to receive in input said third datum, said third datum comprising a value of the flow of infusion liquid flowing through said infusion line, or a ratio between the blood flow removed from the patient and the value of the flow of infusion liquid flowing through said infusion line, and said blood flow calculation device further comprising a control unit connected to said memory and to said user interface, said control unit being programmed to calculate said second datum as a function of said first datum and said third datum, said control unit being connected to said first sensor means, said control unit being programmed to cooperate with the first and second movement means for bringing the actual value of the flow of liquid across said post-infusion tract towards a set value of the flow of liquid across the same post infusion tract or towards said calculated second datum.
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Specification