Abstract:
In a hemodiafiltration apparatus, a control and command unit (11) halts a replacement fluid supply pump (8) and contemporaneously modifies the control mode of a blood pump (1) passing from a control based on the pump velocity to a control based on the blood pressure measured by a sensor (12) arranged downstream of a hemodiafilter (3). The aim is to prevent risks due to excessive hemoconcentration in the blood circuit between the ultrafiltration zone and the infusion zone.
Abstract:
A system (1) and a method for renal replacement therapy comprising a blood treatment unit (4) connected to a blood circuit (2) and a dialysis fluid circuit (3), the system (1) further comprises a control unit (31) configured to control the system (1) according to control instructions comprising to, during a treatment, determine a system parameter value and an indication of membrane fouling of the membrane (7), and activate an automatic anti-fouling measure comprising a temporary change of the flow rate in the blood circuit (2) and a temporary decrease of the ultrafiltration rate wherein a timing of the temporary change and a timing of the temporary reduction are synchronized.
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:
A blood treatment apparatus (2) comprising: a blood treatment unit (10); a blood line (20) configured to extract blood from a blood source (21), pass the blood through the blood treatment unit (10) and deliver treated blood to a target vessel (22); and a fluid line (30) configured pass treatment fluid through the blood treatment unit (10) and deliver used treatment fluid to a fluid sink (32). A flow divider (40) is arranged in the fluid line (30) separates treatment fluid into to a first fluid section (51) and a second fluid section (53), thereby electrically isolating the fluid sections (51, 53) such that electrical current flowing in the fluid line (30) between the fluid sections (51, 53) is limited. Related manufacturing and verification methods are also described.
Abstract:
A system (1) and method for renal replacement therapy, where the system comprises a blood treatment unit (4) connected to a blood circuit (2) for extracorporeal circulation of blood, and a method for operating the system (1). The system (1) comprises inter alia a blood pump (19), a pre-dilution line (10), a post-dilution line (11), flow control means (12) and a control unit (31) configured to control the system (1) according to control instructions. The control instructions comprise to, during a treatment, determine a system parameter value and an indication of membrane fouling of the membrane (7), and to activate an automatic anti-fouling measure in order to create a flushing of the blood treatment unit (4) comprising an increase of a pre-dilution flow rate Qpre to more than 100% of a present value of the post-dilution flow rate Qpost.
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:
A blood treatment apparatus, comprising a blood treatment unit (D) configured to receive untreated blood and fresh blood treatment fluid, and emit treated blood and used blood treatment fluid, a pair of fluid pumps ( PF1, PF2; PF3, PF4) configured to pass blood treatment fluid through the blood treatment unit (D), a pair of blood pumps ( PB1, PB2) configured to extract untreated blood from a blood source (BS), pass extracted blood through the blood treatment unit (D) and deliver treated blood to a target vessel (BT), each blood pump comprising a pump chamber and a flexible member ( FM1; FM2) separating the pumping chamber into a first blood accumulating container (B1; B2) and a second working fluid accumulating container (F1; F2) where the flexible member is configured to vary a volume relationship between the first and the second accumulation containers. Further the apparatus comprises a control unit (P) and a measuring means configured to emit a feedback signal indicative of the amount of working fluid received into, or discharged from at least one of the second accumulation containers (F1; F2) whereby the pumped mass or volume of working fluid is determined by the control unit (P) at an arbitrary position of the flexible member (FM1, FM2).
Abstract:
An extracorporeal blood treatment apparatus suitable for e.g. hemodiafiltration or hemofiltration pre-dilution treatment 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 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 monitoring device (7) operates on a pressure signal from a blood processing apparatus, e.g. a dialysis machine, which has an extracorporeal blood circuit connected to a vascular system of a subject for pumping blood through a dialyzer, and a treatment fluid supply system for pumping a treatment fluid through the dialyzer. The monitoring device (7) has a first input block (50) for obtaining a first pressure signal (y) from a first pressure sensor (6a) in the extracorporeal blood circuit, and a second input block (51) for obtaining a second pressure signal (w) from a second pressure sensor (6b) in the treatment fluid supply system. An emulation block (56) generates, as a function of the second pressure signal (w), an emulated first pressure signal (y) which emulates a concurrent signal response of the first pressure sensor (6a), and a filtering block (53) generates a filtered signal (y) as a function of the first pressure signal (y) and the emulated first pressure signal (y), so as to suppress, in the filtered signal (}y) compared to the first pressure signal (y), signal interferences originating from the treatment fluid supply system (lb). A pulse detection block (54) processes the filtered signal (y f ) for detection of subject pulses originating from the subject.