| 摘要 |
<p>A dialysis machine has a means for preparing a dialysis liquid containing a controlled sodium concentration and can control the sodium concentration in a dialysis liquid so the blood inside a patient tends to the desired concentration of Na<+> ions, as a function of the desired sodium concentration, the dialysis performance and the perfusion flow rate. The concentration of sodium in the dialysis liquid is calculated using the formula: (Na<+>)dial = Qinf/D((Na<+>)des - (Na<+>)sol) + (Na<+>)des where (Na<+>)sol is the concentration of sodium in the perfusion solution, (Na<+>)dial is the concentration of sodium in the dialysis liquid, Qinf is the perfusion flow rate, (Na<+>)des is the desired concentration of sodium inside the patient and D is the dialysis performance. The device also contains means of determining the dialysis performance for sodium by successively measuring the conductivity of at least two fluids up- and downstream of the dialysis machine (Cd1in, Cd1out, Cd2in, Cd2out). These give a dialysis performance D = Qd((Cd1out-Cd1in)-(Cd2out-Cd2in))/(Cd2in-Cd1in), where Qd is the dialysis liquid flow rate.</p> |
