Blood treatment device
First Claim
1. A blood treatment device comprising a blood purification element which is divided into two chambers by a semipermeable membrane, with a first chamber being part of a dialysis fluid circuit and a second chamber being part of an extracorporeal blood circuit,a dialysis fluid inlet line which leads from a dialysis fluid processing unit to supply fresh dialysis fluid to at least one of the first chamber and directly into the blood circuit,a dialysis fluid outlet line for removing spent dialysis fluid from the first chamber,a blood inlet line for supplying blood to the second chamber,a blood return line for returning blood from the second chamber,a control unit for controlling the blood treatment device,an analyzer unit which is connected to the control unit, andat least one sensor which is connected to the analyzer unit on at least one of the blood circuit and the dialysis fluid circuit for detecting the concentration of a substance which is capable of penetrating through the semipermeable membrane,the analyzer unit being configured (i) to determine on the basis of detected values of the at least one sensor the concentration Cbi of the substance in the blood in the blood inlet line, the instantaneous transfer rate Δ
- M/Δ
t of the substance through the membrane, and the total quantity M of the substance withdrawn through the membrane during the treatment, (ii) to store a first admissible value range for the blood concentration Cbi of the substance, a second admissible value range for the transfer rate Δ
M/Δ
t, and a third admissible value range for the total quantity M of the substance to be withdrawn, and (iii) to instruct the control unit such that the blood treatment device performs the blood treatment while maintaining all three of the admissible value ranges,the dialysis fluid processing unit being configured to add potassium to the fresh dialysis fluid, andthe substance whose concentration is detected by the at least one sensor being potassium.
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Accused Products
Abstract
A blood treatment device has a blood purification element divided into two chambers by a semipermeable membrane. With the device, nonphysiological conditions of the patient, in particular critical potassium concentrations and withdrawal rates, can be better prevented during the blood treatment. The device'"'"'s analyzer unit determines on the basis of at least one sensor the concentration of a substance in the blood in the blood inlet line, the instantaneous transfer rate of this substance through the membrane, and the total quantity of this substance withdrawn during the treatment. The determined concentration is compared with a first admissible value range, the transfer rate is compared with a second admissible value range, and the quantity of the substance withdrawn is compared with a third value range. The device'"'"'s control unit can instruct the device such that the blood treatment device performs the blood treatment while maintaining all three admissible value ranges.
27 Citations
12 Claims
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1. A blood treatment device comprising a blood purification element which is divided into two chambers by a semipermeable membrane, with a first chamber being part of a dialysis fluid circuit and a second chamber being part of an extracorporeal blood circuit,
a dialysis fluid inlet line which leads from a dialysis fluid processing unit to supply fresh dialysis fluid to at least one of the first chamber and directly into the blood circuit, a dialysis fluid outlet line for removing spent dialysis fluid from the first chamber, a blood inlet line for supplying blood to the second chamber, a blood return line for returning blood from the second chamber, a control unit for controlling the blood treatment device, an analyzer unit which is connected to the control unit, and at least one sensor which is connected to the analyzer unit on at least one of the blood circuit and the dialysis fluid circuit for detecting the concentration of a substance which is capable of penetrating through the semipermeable membrane, the analyzer unit being configured (i) to determine on the basis of detected values of the at least one sensor the concentration Cbi of the substance in the blood in the blood inlet line, the instantaneous transfer rate Δ - M/Δ
t of the substance through the membrane, and the total quantity M of the substance withdrawn through the membrane during the treatment, (ii) to store a first admissible value range for the blood concentration Cbi of the substance, a second admissible value range for the transfer rate Δ
M/Δ
t, and a third admissible value range for the total quantity M of the substance to be withdrawn, and (iii) to instruct the control unit such that the blood treatment device performs the blood treatment while maintaining all three of the admissible value ranges,the dialysis fluid processing unit being configured to add potassium to the fresh dialysis fluid, and the substance whose concentration is detected by the at least one sensor being potassium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- M/Δ
Specification