Hemodialysis or hemo(dia)filtration apparatus and a method for controlling a hemodialysis or hemo(dia)filtration apparatus
First Claim
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1. A hemodialysis or hemo(dia)filtration apparatus, comprising:
- a blood treatment device having a blood chamber and a fluid chamber which are separated from one another by a semipermeable membrane;
an extracorporeal blood circuit having an arterial line for blood removal from an individual and a venous line for blood return to the individual, the arterial line and the venous line being connected to an inlet and, respectively, to an outlet of the blood chamber;
a blood movement device configured for moving the blood along the extracorporeal circuit;
at least a venous pressure sensor configured for emitting a venous pressure signal indicating a pressure in the venous line;
a fluid circuit having at least a discharge line connected to an outlet of the fluid chamber;
an ultrafiltration device configured for ultrafiltering plasmatic liquid from the blood chamber to the fluid chamber across the semipermeable membrane;
an infusion circuit having at least a first supply line of an infusion fluid connected to the extracorporeal blood circuit;
an infusion fluid supply device configured to provide a supply of the infusion fluid along the first supply line;
a control unit programmed to perform the following operations;
determining an occurrence of a halt or slow-down or start or speed-up of the supply of the infusion fluid to the extracorporeal blood circuit; and
passing from a first command mode of the blood movement device to a second command mode of the blood movement device by effect of said occurrence of a halt or slow-down or start or speed-up, wherein the blood movement device is, in the second command mode, controlled on a basis of a comparison between said venous pressure signal and at least a set point value.
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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.
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Citations
20 Claims
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1. A hemodialysis or hemo(dia)filtration apparatus, comprising:
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a blood treatment device having a blood chamber and a fluid chamber which are separated from one another by a semipermeable membrane; an extracorporeal blood circuit having an arterial line for blood removal from an individual and a venous line for blood return to the individual, the arterial line and the venous line being connected to an inlet and, respectively, to an outlet of the blood chamber; a blood movement device configured for moving the blood along the extracorporeal circuit; at least a venous pressure sensor configured for emitting a venous pressure signal indicating a pressure in the venous line; a fluid circuit having at least a discharge line connected to an outlet of the fluid chamber; an ultrafiltration device configured for ultrafiltering plasmatic liquid from the blood chamber to the fluid chamber across the semipermeable membrane; an infusion circuit having at least a first supply line of an infusion fluid connected to the extracorporeal blood circuit; an infusion fluid supply device configured to provide a supply of the infusion fluid along the first supply line; a control unit programmed to perform the following operations; determining an occurrence of a halt or slow-down or start or speed-up of the supply of the infusion fluid to the extracorporeal blood circuit; and passing from a first command mode of the blood movement device to a second command mode of the blood movement device by effect of said occurrence of a halt or slow-down or start or speed-up, wherein the blood movement device is, in the second command mode, controlled on a basis of a comparison between said venous pressure signal and at least a set point value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A hemodialysis or hemo(dia)filtration apparatus, comprising:
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a blood treatment device having a blood chamber and a fluid chamber which are separated from one another by a semipermeable membrane; an extracorporeal blood circuit having an arterial line for blood removal from an individual and a venous line for blood return to the individual, the arterial line and the venous line being connected to an inlet and, respectively, to an outlet of the blood chamber; a blood movement device configured for moving the blood along the extracorporeal circuit; at least a venous pressure sensor configured for emitting a venous pressure signal indicating a pressure in the venous line; a fluid circuit having at least a discharge line connected to an outlet of the fluid chamber; an ultrafiltration device configured for ultrafiltering plasmatic liquid from the blood chamber to the fluid chamber across the semipermeable membrane; an infusion circuit having at least a first supply line of an infusion fluid connected to the extracorporeal blood circuit; an infusion fluid supply device configured to provide a supply of the infusion fluid along the first supply line; an event sensor configured for indicating an event selected in the group of; a halt of the supply of the infusion fluid to the extracorporeal blood circuit, a slow-down of the supply of the infusion fluid to the extracorporeal blood circuit, a start of the supply of the infusion fluid to the extracorporeal blood circuit, a speed-up of the supply of the infusion fluid to the extracorporeal blood circuit; a control unit programmed to perform the following operations; determining an occurrence of said event by detecting an event signal supplied by said event sensor and indicative of said halt or slow-down or start or speed-up of the supply of the infusion fluid; and passing from a first command mode of the blood movement device to a second command mode of the blood movement device by effect of said occurrence of said event, wherein the blood movement device is, in the second command mode, controlled on a basis of a comparison between said venous pressure signal and at least a set point value.
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Specification