| 摘要 |
A method and device for controlling an extracorporeal blood treatment apparatus, which can be operated as a hemodialysis apparatus, hemofiltration apparatus or hemodiafiltration apparatus, are disclosed. The method and device make provision, apart from balancing the fluids as a function of the weights of the containers, for the measurement of the weight reduction or increase of at least one of the containers in the time interval in which the pump assigned to the respective container performs a preset number of revolutions or pump strokes. The change in the weight of the container for a half or one pump revolution can be determined. The delivery rate of the respective pump is ascertained from the measured weight reduction or increase in the specific time interval, thereby permitting the precise determination of the actual delivery rate of one or more pumps. The actual delivery rates of all the pumps are preferably monitored. |
| 主权项 |
1. A method for controlling an extracorporeal blood treatment apparatus, said extracorporeal blood treatment apparatus comprising:
an exchange unit that is divided by a semi-permeable membrane into a first chamber and a second chamber, wherein the first chamber is part of an extracorporeal blood circuit and the second chamber is part of a fluid circuit; a first pump for conveying a first fluid from a first container at a first delivery rate into the second chamber of the exchange unit; a second pump for conveying a second fluid from the second chamber of the exchange unit at a second delivery rate into a second container; a third pump for conveying a third fluid at a third delivery rate from a third container or from the first container into the extracorporeal blood circuit; a first weighing device; and a second weighing device, said method comprising:
weighing the first container and the third container via the first weighing device or weighing the first container via the first weighing device and weighing the second container via the second weighing device;regulating the first, second, and third pumps for balancing the first, second, and third fluids as a function of:
(I)(a) a sum of the weights of the first container and the third container, and (b) the weight of the second container; or(II)(a) the weight of the first container, and (b) the weight of the second container;measuring a weight reduction or a weight increase of at least one of the first, second, or third containers in a time interval in which the first, second, or third pump assigned to the respective first, second, or third container performs a preset number of revolutions or pump strokes;ascertaining a delivery quantity of the respective first, second, or third pump at the preset number of revolutions or pump strokes from the measured weight reduction or weight increase in the time interval;comparing the setpoint delivery quantity of the respective first, second, or third pump at the preset number of revolutions or pump strokes adopted in a drive circuit of the respective first, second, or third pump with the measured delivery quantity of the respective first, second, or third pump at the preset number of revolutions or pump strokes; andbasing the drive circuit of the first, second and third pumps on the deviation of the adopted setpoint delivery quantity of the respective first, second, or third pump at the preset number of revolutions or pump strokes from the measured delivery quantity of the first, second, or third pump at the preset number of revolutions or pump strokes. |
