Method for the determination of a significant parameter of the progess of an extracorporeal treatment of blood
First Claim
1. A method for determining a significant parameter (Cb, D, K, Kt/V) of the progress of an extracorporeal blood treatment carried-out using an apparatus for treating blood, the apparatus being provided with means for circulating blood of a patient and a treatment fluid on opposing sides of a semipermeable membrane in a membrane exchanger, the method comprising the steps of:
- circulating through the exchanger a first treatment fluid (d1), having a characteristic (Cd) linked to at least one of the significant treatment parameters (Cb, D, K, Kt/V);
measuring two, values (Cd1in, Cd1out) of the characteristic (Cd) in the first treatment fluid (d1), respectively upstream and downstream of the exchanger;
circulating through the exchanger a second treatment fluid (d2), having the characteristic (Cd) with a value (Cd2in) upstream of the exchanger different from the value of (Cd1in);
measuring two values (Cd2in, Cd2out) of the characteristic (Cd) in the second treatment fluid (d2), respectively upstream and downstream of the exchanger;
circulating through the exchanger, before the characteristic (Cd) of the second fluid (d2) has reached a stable value downstream of the exchanger, a third treatment fluid (d3) having the characteristic (Cd), a value (Cd3in) of the characteristic (Cd) in the third fluid (d3) upstream of the exchanger being different from the value of (Cd2in);
measuring two values (Cd3in, Cd3out) of the characteristic (Cd) in the third fluid (d3) respectively upstream and downstream of the exchanger; and
calculating, using the measured values of (Cd1in), (Cd1out), (Cd2in), (Cd2out), (Cd3in), and (Cd3out), at least one value of at least one significant parameter of the progress of the treatment (Cb, D, K, Kt/V).
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Abstract
A method for determining a significant parameter (Cb, D, K, Kt/V) of the progress of an extracorporeal blood treatment carried-out using a membrane exchanger, includes the steps of successively circulating three treatment fluids through the exchanger. Each fluid has a characteristic Cd linked to at least one of the significant parameters of the treatment (Cb, D, K, Kt/V). The value of the characteristic in the first fluid upstream of the exchanger is different from the value of the characteristic in the second fluid upstream of the exchanger, the latter being itself different from the value of the characteristic in the third fluid upstream of the exchanger. Two values for each of the three treatment fluids are measured, respectively upstream and downstream of the exchanger, and at least one value of at least one significant parameter of the progress of the treatment (Cb, D, K, Kt/V) is calculated from the measured values.
100 Citations
18 Claims
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1. A method for determining a significant parameter (Cb, D, K, Kt/V) of the progress of an extracorporeal blood treatment carried-out using an apparatus for treating blood, the apparatus being provided with means for circulating blood of a patient and a treatment fluid on opposing sides of a semipermeable membrane in a membrane exchanger, the method comprising the steps of:
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circulating through the exchanger a first treatment fluid (d1), having a characteristic (Cd) linked to at least one of the significant treatment parameters (Cb, D, K, Kt/V); measuring two, values (Cd1in, Cd1out) of the characteristic (Cd) in the first treatment fluid (d1), respectively upstream and downstream of the exchanger; circulating through the exchanger a second treatment fluid (d2), having the characteristic (Cd) with a value (Cd2in) upstream of the exchanger different from the value of (Cd1in); measuring two values (Cd2in, Cd2out) of the characteristic (Cd) in the second treatment fluid (d2), respectively upstream and downstream of the exchanger; circulating through the exchanger, before the characteristic (Cd) of the second fluid (d2) has reached a stable value downstream of the exchanger, a third treatment fluid (d3) having the characteristic (Cd), a value (Cd3in) of the characteristic (Cd) in the third fluid (d3) upstream of the exchanger being different from the value of (Cd2in); measuring two values (Cd3in, Cd3out) of the characteristic (Cd) in the third fluid (d3) respectively upstream and downstream of the exchanger; and calculating, using the measured values of (Cd1in), (Cd1out), (Cd2in), (Cd2out), (Cd3in), and (Cd3out), at least one value of at least one significant parameter of the progress of the treatment (Cb, D, K, Kt/V). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for determining a significant parameter (Cb, D, K, Kt/V) of the progress of an extracorporeal blood treatment carried-out using an apparatus for treating blood, the apparatus being provided with means for circulating blood of a patient and a treatment fluid on opposing sides of a semipermeable membrane in a membrane exchanger, the method comprising the steps of:
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circulating through the exchanger a first treatment fluid (d1), having a characteristic (Cd) linked to at least one of the significant treatment parameters (Cb, D, K, Kt/V); measuring two values (Cd1in, Cd1out) of the characteristic (Cd) in the first treatment fluid (d1), respectively upstream and downstream of the exchanger; circulating through the exchanger a second treatment fluid (d2), having the characteristic (Cd) with a value (Cd2in) upstream of the exchanger different from the value of (Cd1in); measuring two values (Cd2in, Cd2out) of the characteristic (Cd) in the second treatment fluid (d2), respectively upstream and downstream of the exchanger, whereby a time interval (t2-ta) between an instant (ta), when the second fluid (d2) is put into circulation in the exchanger, and an instant (t2), when the value (Cd2out) of the characteristic (Cd) in the second fluid is measured downstream of the exchanger, is chosen such that the characteristic (Cd) has not reached a stable value downstream of the exchanger at the instant (t2); circulating through the exchanger before the characteristic (Cd) of the second fluid (d2) has reached a stable value downstream of the exchanger, a third treatment fluid (d3) having the characteristic (Cd), a value (Cd3in) of the characteristic (Cd) in the third fluid (d3) upstream of the exchanger being different from the value of (Cd2in); measuring two values (Cd3in, Cd3out) of the characteristic (Cd) in the third fluid (d3) respectively upstream and downstream of the exchanger, whereby a time interval (t3-tb) between an instant (tb), when the third fluid (d3) is put into circulation in the exchanger, and an instant (t3), when the value (Cd3out) in the third fluid is measured downstream of the exchanger, is chosen such that the characteristic (Cd) has not reached a stable value downstream of the exchanger at the instant (t3); and calculating, using the measured values of (Cd1in), (Cd1out), (Cd2in), (Cd2out), (Cd3in), and (Cd3out), at least one value of at least one significant parameter of the progress of the treatment (Cb, D, K, Kt/V).
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17. A method for determining a significant parameter (Cb, D, K, Kt/V) of the progress of an extracorporeal blood treatment carried-out in an apparatus for treating blood, the apparatus being provided with means for circulating blood of a patient and a treatment fluid on opposing sides of a semipermeable membrane in a membrane exchanger, the method comprising the steps of:
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circulating through the exchanger a first treatment fluid (d1) having a characteristic (Cd) linked to at least one of the significant parameters of the treatment (Cb, D, K, Kt/V); measuring two values (Cd1in, Cd1out) of the characteristic (Cd) in the first treatment fluid (d1), respectively upstream and downstream of the exchanger; circulating through the exchanger a second treatment fluid (d2), having the characteristic (Cd) with a value (Cd2in) upstream of the exchanger different from the value (Cd1in); measuring two values (Cd2in, Cd2out) of the characteristic (Cd) in the second treatment fluid (d2), respectively upstream and downstream of the exchanger, whereby a time interval (t2-ta) between an instant (ta) when the second fluid (d2) is put into circulation in the exchanger, and an instant (t2) when the value (Cd2out) of the characteristic (Cd) in the second fluid is measured downstream of the exchanger, is chosen such that the characteristic (Cd) has not reached a stable value downstream of the exchanger at the instant (t2); circulating through the exchanger before the characteristic (Cd) of the second fluid (d2) has reached a stable value downstream of the exchanger, a third treatment fluid (d3) having the characteristic (Cd), the value of the characteristic (Cd) in the third fluid (d3) upstream of the exchanger (Cd3in) being substantially equal to the value of (Cd2in); measuring two values (Cd3in, Cd3out) of the characteristic (Cd) in the third fluid (d3) respectively upstream and downstream of the exchanger, whereby a time interval (t3-tb) between an instant (tb) when the third fluid (d3) is put into circulation in the exchanger, and an instant (t3), when the value (Cd3out) of the characteristic (Cd) in the third fluid is measured downstream of the exchanger, is chosen such that the characteristic (Cd) has not reached a stable value downstream of the exchanger at the instant (t3), and wherein the time intervals (t2-ta) and (t3-tb) are chosen to be substantially equal; and calculating, using the measured values of (Cd1in), (Cd1out), (Cd2in), (Cd2out), (Cd3in), and (Cd3out), at least one value of at least one significant parameter of the progress of the treatment (Cb, D, K, Kt/V).
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18. A method for determining a significant parameter (Cb, D, K, Kt/V) of the progress of an extracorporeal treatment of blood carried-out in an apparatus for treating blood, the apparatus being provided with means for circulating blood of a patient and a treatment fluid on opposing sides of the semipermeable membrane of a membrane exchanger, the method comprising the steps of:
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circulating through the exchanger a first treatment fluid (d1) having a characteristic (Cd) linked to at least one of the significant treatment parameters (Cb, D, K, Kt/V); measuring two values (Cd1in, Cd1out) of the characteristic (Cd) in the first treatment fluid (d1), respectively upstream and downstream of the exchanger; circulating through the exchanger a second treatment fluid (d2) having the characteristic (Cd) with a value (Cd2in) upstream of the exchanger different from the value of (Cd1in); measuring two values (Cd2in, Cd2out) of the characteristic (Cd) in the second treatment fluid (d2), respectively upstream and downstream of the exchanger; circulating through the exchanger before the characteristic (Cd) of the second fluid (d2) has reached a stable value downstream of the exchanger, a third treatment fluid (d3) having the characteristic (Cd), a value (Cd3in) of the characteristic (Cd) in the third fluid (d3) upstream of the exchanger being different from the value of (Cd2in); measuring two values (Cd3in, Cd3out) of the characteristic (Cd) in the third fluid (d3), respectively upstream and downstream of the exchanger; calculating, using the measured values of (Cd1in), (Cd1out), (Cd2in), (Cd2out), (Cd3in), and (Cd3out), at least a first and a second value of a same significant parameter of the progress of the treatment (Cb, D, K, Kt/V); comparing at least the first and the second calculated values; and emitting an error signal if the calculated values do not confirm a predefined law.
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Specification