Abstract:
An extracorporeal blood treatment apparatus is provided comprising a filtration unit (2) connected to a blood circuit (17) and to a dialysate circuit (32), a preparation device (9) for preparing and regulating the composition of the dialysis fluid; a control unit (12) is configured for setting a sodium concentration value for the dialysis fluid in the dialysis supply line (8) at a set point; the setting of the sodium concentration includes the sub-step of calculating the sodium concentration value as an algebraic sum of a main contribution term based on the blood plasma conductivity and of an adjustment contribution term based on a concentration of at least a substance in the dialysis fluid chosen in the group including bicarbonate, potassium, acetate, lactate, citrate, magnesium, calcium, sulphate, and phosphate.
Abstract:
An apparatus for extracorporeal treatment of blood (1) comprising a treatment unit, a blood withdrawal line, a blood return line, a preparation line and a spent dialysate line. A control unit (10) is configured to calculate values of a parameter relating to treatment effectiveness based on measures of the conductivity in the spent dialysate line. The value of the effectiveness parameter is calculated using one or more values representative of the conductivity in the spent dialysate line obtained relying on a mathematical model.
Abstract:
An extracorporeal blood treatment apparatus is provided comprising a filtration unit connected to a blood circuit and to a dialysate circuit, a preparation device for preparing and regulating the composition of the dialysis fluid; a control unit is configured for setting a sodium concentration value for the dialysis fluid in the dialysis supply line at a set point based on the physician prescription; starting from the initial patient plasma conductivity, estimated at the beginning of the treatment, and based on the target plasma conductivity/sodium concentration which is equivalent to the dialysate conductivity/sodium concentration prescribed, the control unit determines the minimum constant gradient between dialysis fluid and plasma conductivity/concentration to be maintained during treatment to achieve the conductivity/concentration target in the patient plasma at the end of the session.
Abstract:
An apparatus (1) for extracorporeal blood treatment is described, comprising a treatment unit (2), an extracorporeal blood circuit (8), an infusion line (9, 9a, 9b) of a replacement fluid, a dialysis line connected in inlet to the second chamber (4), and a fluid evacuation line (10). The apparatus further comprises sensors for determining a first parameter relating to a patient's blood volume (BV%) a second parameter relating to an ultrafiltration flow rate (UFR) or to a patient's weight loss rate (WLR), a third parameter (Cd, Na) relating to a conductivity or concentration of a liquid crossing the dialysis line and/or the infusion line, and a fourth parameter relating to an infusion flow rate (Q INF ). Lastly, the apparatus comprises a control unit for performing a control procedure comprising receiving, from the sensors, the measured values of the above-cited parameters and calculating, on the basis of the measured values and the prescription values of the variation in blood volume (BV% target ), the weight loss (WL target )> the plasma conductivity or sodium concentration(C target , Na target) , the infusion volume (V INFtarget ), control values to be imposed during a time interval following the control instant.
Abstract:
A control unit of an apparatus for extracorporeal blood treatment is configured to perform a control procedure comprising: calculating parameter control values to be set during a time interval after the instant in which the control is made, on the basis of actual values and of prescription values of variation in blood volume, ultrafiltration flow rate, concentration of sodium; imposing the parameter control values during the time interval consecutive to the instant in which the control is made such that the actual values of the variation in blood volume track the prescription values of the variation in blood volume over a predetermined treatment time. The control unit is further configured to perform a procedure for automatically estimating/calculating a target plasma conductivity and/or a target concentration of sodium in plasma to be reached at the end of the extracorporeal blood treatment.
Abstract:
An extracorporeal blood treatment apparatus is provided comprising a filtration unit (2) connected to a blood circuit (17) and to a dialysate circuit (32), a preparation device (9) for preparing and regulating the composition of the dialysis fluid, and a sensor (11) for measuring conductivity of the dialysate (i.e. spent dialysis fluid); a control unit (12) configured for setting a sodium concentration in the dialysis fluid and after setting the dialysis fluid at the initial set point, circulating the dialysis fluid and/or the substitution fluid, measuring an initial conductivity value of the dialysate at the beginning of the treatment, and calculating, based on the measured initial conductivity value of the spent dialysis fluid and on the corresponding conductivity value of the dialysis fluid, the value of the initial plasma conductivity, said circulating the dialysis fluid up to the calculating of the initial plasma conductivity being performed maintaining the dialysis fluid conductivity substantially constant.
Abstract:
An apparatus (1 ) for extracorporeal blood treatment is described, comprising a treatment unit (2), an extracorporeal blood circuit (8), an infusion line (9, 9a, 9b) of a replacement fluid, a dialysis line connected in inlet to the second chamber (4), and a fluid evacuation line (10). The apparatus further comprises sensors for determining a first parameter relating to a patient's blood volume (BV%) a second parameter relating to an ultrafiltration flow rate (UFR) or to a patient's weight loss rate (WLR), a third parameter (Cd, Na) relating to a conductivity or concentration of a liquid crossing the dialysis line and/or the infusion line, and a fourth parameter relating to an infusion flow rate (Q INF )- Lastly, the apparatus comprises a control unit for performing a control procedure (50) for regulating a variation in blood volume (BV%) and a setting sequence (200) for imposing a transmembrane pressure (TMP) to values which enable maximising the convective exchanges.
Abstract:
An extracorporeal blood treatment apparatus is provided comprising a filtration unit (2) connected to a blood circuit (17) and to a dialysate circuit (32), a preparation device (9) for preparing and regulating the composition of the dialysis fluid, and a sensor (11) for measuring conductivity of the dialysate (i.e. spent dialysis fluid); a control unit (12) configured for setting a sodium concentration in the dialysis fluid and after setting the dialysis fluid at the initial set point, circulating the dialysis fluid and blood trough the filtration unit (2), measuring an initial conductivity value of the dialysate at the beginning of the treatment, and calculating, based on the measured initial conductivity value of the spent dialysis fluid and on the corresponding conductivity value of the dialysis fluid, the value of the initial plasma conductivity, said circulating the dialysis fluid up to the calculating of the initial plasma conductivity being performed maintaining the dialysis fluid conductivity substantially constant.
Abstract:
A method of operating an extracorporeal blood treatment includes, prior to commencing an extracorporeal blood treatment, reading from a storage device (4a, 5a) stored values of a patient- specific prescription parameter. These stored values relate to a sequence of previous extracorporeal blood treatments. In addition, the method includes processing the stored values of the parameter read from the storage device (4a, 5a) according to a predetermined algorithm to determine a current value of the patient-specific prescription parameter. The current value is then available for the subsequent extracorporeal blood treatment.
Abstract:
A control unit of an apparatus for extracorporeal blood treatment is configured to perform a control procedure comprising: calculating parameter control values to be set during a time interval after the instant in which the control is made, on the basis of actual values and of prescription values of variation in blood volume, ultrafiltration flow rate, concentration of sodium and/or potassium and heart rate or variation of heart rate of the patient; imposing the parameter control values during the time interval consecutive to the instant in which the control is made such that the actual values of the variation in blood volume track the prescription values of the variation in blood volume over a predetermined treatment time and the actual values of the heart rate or variation of heart rate track the prescription values of the heart rate or variation of heart rate over the predetermined treatment time.