method for the determination of behandlungsparameters a hu00e4mofiltrationsvorrichtung and hu00e4mofiltrationsvorrichtung for application of the procedure

摘要

First and second chambers (103, 104) separated by a semipermeable membrane (102) are parts of an ultrafiltration removal system and an extracorporeal blood circuit respectively. A substitution fluid addition system (107), feeds the extracorporeal circuit. Fluid flow from the first chamber (Qo) is determined. A physical-chemical property Cs1 in the substitution fluid and the corresponding physical-chemical property Cf1 in the fluid removed, are determined. Cs is varied. Corresponding Cs2 properties Cs2 and Cf2 in the substitution fluid and fluid removed, are re-determined. From the values determined for removed fluid flow Qo, properties Cs1, Cs2, Cf1 and Cf2, a treatment parameter is determined. An Independent claim is included for corresponding blood filtration equipment. Preferred Features: Variation in Cs is step-shaped or curved. The treatment parameter is the dialysance of the blood purification element, determined from D = (1 - DELTACf/DELTACs).Qo, where DELTA expresses the measured differences caused by variation in Cs. The treatment parameter is alternatively the blood inlet concentration Cbi. In the extracorporeal circuit, total ultrafiltrate flow Qf withdrawn, and the substitution fluid flow Qs are determined. The flow removed Qo, is determined from their sum. An additional flow of dialysis fluid Qd is provided in the first chamber. The flow removed is determined as the sum of the total ultrafiltrate flow withdrawn (Qf), the substitution fluid flow Qs and the fluid supplied Qd. In addition, the blood flow Qb is determined as the effective blood flow into the blood supply line which can alter the physical-chemical property. Dialysance D1 is determined from the first set of flows, D2 is calculated from a second set, D1 and the first set. Based on numbers of values D1i, taken at various times i during the treatment, and values D2j calculated for various times during treatment, the total treatment coefficient Kt is determined by summing and multiplying by the time differences from prior or subsequent measurement/calculation.