WO1999062574A1 - Method for determining waste products in the dialysis liquid in dialysis treatment - Google Patents

Method for determining waste products in the dialysis liquid in dialysis treatment Download PDF

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Publication number
WO1999062574A1
WO1999062574A1 PCT/SE1999/000976 SE9900976W WO9962574A1 WO 1999062574 A1 WO1999062574 A1 WO 1999062574A1 SE 9900976 W SE9900976 W SE 9900976W WO 9962574 A1 WO9962574 A1 WO 9962574A1
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WO
WIPO (PCT)
Prior art keywords
dialysis
dialysis liquid
dialyzer
measurement
waste products
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SE1999/000976
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French (fr)
Inventor
Thore Falkvall
Lars-Olof Sandberg
Ivo Fridolin
Lars-Göran LINDBERG
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Althin Medical AB
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Althin Medical AB
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Application filed by Althin Medical AB filed Critical Althin Medical AB
Priority to EP99927067A priority Critical patent/EP1083948B1/en
Priority to DE69916053T priority patent/DE69916053T2/en
Priority to AT99927067T priority patent/ATE262932T1/en
Priority to US09/700,849 priority patent/US6666840B1/en
Priority to JP2000551827A priority patent/JP2002516722A/en
Publication of WO1999062574A1 publication Critical patent/WO1999062574A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/14—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
    • A61M1/16—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis with membranes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/14—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
    • A61M1/16—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis with membranes
    • A61M1/1601—Control or regulation
    • A61M1/1603—Regulation parameters
    • A61M1/1605—Physical characteristics of the dialysate fluid
    • A61M1/1609—Physical characteristics of the dialysate fluid after use, i.e. downstream of dialyser
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/14—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
    • A61M1/16—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis with membranes
    • A61M1/1601—Control or regulation
    • A61M1/1619—Sampled collection of used dialysate, i.e. obviating the need for recovery of whole dialysate quantity for post-dialysis analysis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2202/00—Special media to be introduced, removed or treated
    • A61M2202/04—Liquids
    • A61M2202/0496—Urine
    • A61M2202/0498—Urea
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/15—Detection of leaks
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/50—General characteristics of the apparatus with microprocessors or computers

Definitions

  • the invention relates to a method for determining waste products in the dialysis liquid in dialysis treatment .
  • dialysis treatment The extent of the dialysis treatment that a patient shall be exposed to cannot be determined by feeling only; it is necessary to quantify in some way the result of the dialysis effect in order to avoid that the dialysis treatment will be insufficient.
  • dialysis treatment is an expensive type of treatment, it is also just as important to avoid "overtreatment" of a patient. In other words, it is necessary to be able to control the efficiency of the dialysis treatment on-line, i.e. while the dialysis treatment is in progress, in order then to control manually or automatically the treatment by adjustment of the parameters of the dialysis machine in dependence thereof and thus to make the dialysis treatment more efficient.
  • Kt/V (urea) -model In order to secure an adequate dialysis treatment the Kt/V (urea) -model has been developed (urea is one of the substances in the waste products used for measuring if an adequate treatment is offered) , where K is the ability of the dialyzer to separate urea from the blood in ml/min, t is the treatment period in minutes, and V is the distribution of urea in the body in ml, which is related to the body weight of the patient.
  • the non-dimensional factor Kt/V(urea) defines the reduction of the content of urea nitrogen in the blood and at three treatments each week should equal or be larger than 1 (at daily treatment the factor is lower than 1) , and by using this factor it is possible to calculate the result of the treatment of the patient.
  • Kt/V(urea) The calculation of Kt/V(urea) is, however, complicated and requires that particularly the capacity of the dialyzer but also the accuracy of the dialysis machine and the distribution of the urea volume in the patient are accurately determined ( Lindsay et al . Urea Moni toring During Dialysis : The wave of the Future, Vol . XXXVII -Trans Am Soc Arif Intern Organs 1991) .
  • the Kt/V (urea) -model is used but is not considered absolutely reliable due to inherent sources of errors which are related to measurement values and product precision.
  • the device comprises a computer to which such quantities, i.a. Kt/V (urea), are supplied, which as required for calculation of the percentage reduction of urea (PRU) in the patient.
  • Kt/V percentage reduction of urea
  • a plasma sample is taken via a plasma filter from the extracorporeal blood path and is mixed with enzyme solution and reagent, the mixture obtained then being examined optically in order to determine the amount of urea in the blood, which in turn is used for determining the time at which the dialysis treat- ment in progress should be stopped.
  • the purpose of the invention is to provide a method for accurate determination of the amount of waste products in the dialysis liquid during dialysis treatment, which allows application of a technique known per se and the use of a reliable apparatus set and which allows that urea or some other substance included in the waste products is measures so that one can choose to make the determination by measuring the substances which are best suited for the election of dialyzer and the control of the dialysis machine in order to adapt the dialysis treatment to the patient.
  • the method according to claim 1 is proposed according to the invention.
  • FIG. 1 is a diagrammatic view of an analysis system with continuous (on-line) measurement of the amount of one or more substances included in the waste products removed from the dialyzer by the dialysis liquid
  • FIG. 2 is a diagram disclosing the absorption of waste products during a dialysis treatment at different wavelengths of the UV-light and at different times after the beginning of the dialysis treatment
  • FIG. 3 is a diagram showing the continuously recorded UV-absorption during a dialysis treatment for the wavelength 280 nm
  • FIG. 4 is a diagram disclosing the concentration of certain important substances in the waste products and has been established by measuring in a chemical laboratory
  • FIG. 5 is a diagram which discloses the variation in UV-absorption for urea at different wavelengths of the UV-light
  • FIG. 6 is a corresponding diagram as that in FIG. 4 for creatinine
  • FIG. 7 is a corresponding diagram as that in FIG. 4 for hippuric acid.
  • FIG. 8 is a partial diagrammatic view similar to that in FIG. 1 of a modified embodiment of the dialysis system.
  • the dialysis system disclosed in FIG. 1 comprises a dialysis machine 10 to which water is supplied at 11 and concentrates A and B at 12 and 13, respectively, for the production of dialysis liquid which is supplied to a dia- lyzer 14 at one side of the membrane therein and is drawn off from the dialyzer at the same side of the membrane at 15 in order to be supplied to a drain through a conduit 16.
  • the dialyzer 14 is connected to the blood system of a patient through a hose 17 for diverting blood to the dialyzer. The blood is returned from said other side of the membrane to the patient through a hose 18.
  • the hose 17, the dialyzer 14, and the hose 18 thus form an extracorporeal blood path in which the blood via the membrane in the dialyzer contacts the dialysis liq- uid in order that waste products existing in the blood shall pass through the membrane to the dialysis liquid by diffusion and convection.
  • a transparent measuring cell 19 to which UV-light is supplied from a light source 20 through an optic fibre 21.
  • Light which is supplied to the measuring cell and passes through said cell and dialysis liquid passing therethrough will be absorbed and scattered in a varying degree by the waste products existing in the dialysis liquid so that increased concentration of a substance in the dialysis liquid reduces the light transmission.
  • the light passing through is diverted by an optic fibre 22 to a photodetector 23 to be transformed therein to an electric signal which via an algorithm including multiplication of the measured concentration by the existing flow of dialysis liquid will be converted into a signal the value of which is related to the content of a single substance in the waste products or a combination of several substances.
  • the signal is supplied to a computer 24 with a display 25 for visualisation of the measurement result, and a printer 26 for printing of the measurement result.
  • a dot-and-dash line 27 indicates that the measurement result obtained can be transferred from the monitor to the dialysis machine for modification of the adjustment thereof as required by the measurement result.
  • the light absorption due to waste products in the dialysis liquid flowing from the dialysis machine has been registered during the dialysis treatment at different wavelengths of the UV-light within the interval 180-380 nm, preferably 200-320 nm, by means of a spectrophotometer of the manufacture Kontron. The registration has taken place at different times after the beginning of the dialysis treatment, and the result is shown in FIG. 2.
  • the absorption is high, i.e. the concentration of waste products in the dialysis liquid is great, at the beginning of the dialysis treatment and then decreases continuously during 240 min.
  • the continuously registered UV- absorption during a dialysis treatment is disclosed in FIG. 3 for the wavelength 280 nm.
  • the substances which occur as waste products in the dialysis liquid have been added to clean dialysate one at the time in concentrations which correspond to the concentrations existing in the dialysis liquid at dialysis, or higher, and spectrophotometric graphs have been recorded.
  • FIG. 5 the variation of the UV-absorption for urea
  • FIG. 6 for creatinine
  • FIG. 7 for hippuric acid.
  • the absorption varies for different substances.
  • the absorption is higher for urea between 200 and 220 nm, for creatinine between 200 and 260 nm, and for hippuric acid between 200 and 280 nm.
  • the object of the invention in the first place is to determine in a simple and reliable manner the content of waste products in the dialysis liquid in dialysis treatment in order that the patient by guidance thereof can be given an adequate dialysis treatment, but it is also possible to change in dependence of the measurement result the adjustment of the dialysis machine (feedback) in order to adapt the dialysis treatment to the special needs of the patient.
  • a certain substance for the monitoring of the dialysis treatment exactly the substance can be chosen which is most suitable for the patient and is suitable for the election of dialyzer and the control of the dialysis machine.
  • the absorption of UV-light is measured, which passes through the outgoing dialysis liquid, but it is possible to measure instead according to known technique the UV-light which is reflected from the dialysis liquid.
  • the light source 20, the measuring cell 19, and the photodetector 23 can be integrated to a unit except the optic fibres 21 and 22.
  • the measurement on the dialysis liquid is effected continuously during the dialysis treatment but it is also possible to divert at intervals a minor quantity of the dialysis liquid and to measure on this quantity which is then sent to the drain.
  • This sam- pling batch-wise can be totally automated.
  • FIG. 8 The measuring cell 19 is mounted in a shunt conduit 27 which is connected to the drain conduit 16 via a valve 28 at the inlet side of the measuring cell, and a valve 29 at the outlet side of the measuring cell. Valve 28 being open and valve 29 being closed a quantity of the outgoing dialysis liquid is taken from the drain conduit 16 into the measuring cell. After measuring on the dialysis liquid in the measuring cell as described above the valve 29 is opened to tap off the dialysis liquid in the measuring cell to the drain conduit. The valves as well as the measuring on the dialysis liquid in the measuring cell can be controlled automatically.

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Abstract

Method and device for determining in dialysis treatment the content of waste products in the outgoing dialysis liquid from the dialyzer. Measurement of the concentration of a certain substance or a combination of substances included in the waste products is effected spectrophotometrically directly on the outgoing dialysis liquid from the dialyzer. For that purpose there is provided after the dialyzer in or after the dialysing machine a measuring cell for spectrophotometric measurement. The measurement value obtained is multiplied by the flow of dialysis liquid for determining the content of said substance or said combination of substances in the outgoing dialysis liquid from the dialyzer.

Description

Method for determining waste products in the dialysis liquid in dialysis treatment
The invention relates to a method for determining waste products in the dialysis liquid in dialysis treatment .
Patients who have reduced kidney function or no kidney function at all get rid of waste products, including toxic substances, by dialysis treatment wherein the blood in an extracorporeal path via a membrane in the dialyzer is contacted with dialysis liquid containing different salts in such a concentration that the waste products by diffusion and convection pass through the membrane to the dialy- sis liquid and continue to a drain, the blood after having passed the dialyzer being returned to the patient.
The extent of the dialysis treatment that a patient shall be exposed to cannot be determined by feeling only; it is necessary to quantify in some way the result of the dialysis effect in order to avoid that the dialysis treatment will be insufficient. Considering that dialysis treatment is an expensive type of treatment, it is also just as important to avoid "overtreatment" of a patient. In other words, it is necessary to be able to control the efficiency of the dialysis treatment on-line, i.e. while the dialysis treatment is in progress, in order then to control manually or automatically the treatment by adjustment of the parameters of the dialysis machine in dependence thereof and thus to make the dialysis treatment more efficient. In order to secure an adequate dialysis treatment the Kt/V (urea) -model has been developed (urea is one of the substances in the waste products used for measuring if an adequate treatment is offered) , where K is the ability of the dialyzer to separate urea from the blood in ml/min, t is the treatment period in minutes, and V is the distribution of urea in the body in ml, which is related to the body weight of the patient. The non-dimensional factor Kt/V(urea) defines the reduction of the content of urea nitrogen in the blood and at three treatments each week should equal or be larger than 1 (at daily treatment the factor is lower than 1) , and by using this factor it is possible to calculate the result of the treatment of the patient. The calculation of Kt/V(urea) is, however, complicated and requires that particularly the capacity of the dialyzer but also the accuracy of the dialysis machine and the distribution of the urea volume in the patient are accurately determined ( Lindsay et al . Urea Moni toring During Dialysis : The wave of the Future, Vol . XXXVII -Trans Am Soc Arif Intern Organs 1991) . The Kt/V (urea) -model is used but is not considered absolutely reliable due to inherent sources of errors which are related to measurement values and product precision.
It has been recommended to combine the Kt/V(urea)- model with continuous determined of the percentage reduction of urea in the patient during the dialysis treatment, and a proposal along this line is Dianalyzer from Paradigm Biotechnologies, Toronto, Canada . The device comprises a computer to which such quantities, i.a. Kt/V (urea), are supplied, which as required for calculation of the percentage reduction of urea (PRU) in the patient. A plasma sample is taken via a plasma filter from the extracorporeal blood path and is mixed with enzyme solution and reagent, the mixture obtained then being examined optically in order to determine the amount of urea in the blood, which in turn is used for determining the time at which the dialysis treat- ment in progress should be stopped. In Dianalyzer sampling is effected a certain number of times during the dialysis treatment and, thus, no continuous measurement of the urea reduction is concerned. In order to measure the urea reduction in the blood it is necessary to have parameters avail- able which either must be established by blood analysis or have to be estimated, which makes this type of measurement unsuitable for application on-line. The development of this measuring method has been focused substantially on the development of suitable sampling devices in combination with traditional analysis instruments.
An apparatus which functions in a similar way with chemical reagents for determining of Kt/v is Biostat ™Urea Moni tor from Baxter.
Monitoring of the urea content in the outlet flow of dialysis liquid provides greater flexibility as far as the applied measuring system is concerned, but so far the development has led up to manual sampling and the use of traditional measuring system. Samples of the dialysate therefor usually must be sent to a laboratory with the necessary measurement equipment.
Thus, it has been proposed ( IEEE Engineering in Medicine & Biology Society 11th International Conference) for continuous monitoring of hemodialysis to measure enzy- matically induced conductivity changes caused by hydrolyse of urea (or other important molecules) in the dialysis liquid, especially developed sensors being used for such measurement . A drawback of these sensors is that they are cumbersome to calibrate and that it can be difficult to compensate for existing background conductivity. The purpose of the invention is to provide a method for accurate determination of the amount of waste products in the dialysis liquid during dialysis treatment, which allows application of a technique known per se and the use of a reliable apparatus set and which allows that urea or some other substance included in the waste products is measures so that one can choose to make the determination by measuring the substances which are best suited for the election of dialyzer and the control of the dialysis machine in order to adapt the dialysis treatment to the patient. For said purpose the method according to claim 1 is proposed according to the invention.
For description of the invention in more detail reference is made to the accompanying drawings in which FIG. 1 is a diagrammatic view of an analysis system with continuous (on-line) measurement of the amount of one or more substances included in the waste products removed from the dialyzer by the dialysis liquid, FIG. 2 is a diagram disclosing the absorption of waste products during a dialysis treatment at different wavelengths of the UV-light and at different times after the beginning of the dialysis treatment, FIG. 3 is a diagram showing the continuously recorded UV-absorption during a dialysis treatment for the wavelength 280 nm,
FIG. 4 is a diagram disclosing the concentration of certain important substances in the waste products and has been established by measuring in a chemical laboratory,
FIG. 5 is a diagram which discloses the variation in UV-absorption for urea at different wavelengths of the UV-light, FIG. 6 is a corresponding diagram as that in FIG. 4 for creatinine,
FIG. 7 is a corresponding diagram as that in FIG. 4 for hippuric acid, and
FIG. 8 is a partial diagrammatic view similar to that in FIG. 1 of a modified embodiment of the dialysis system.
The dialysis system disclosed in FIG. 1 comprises a dialysis machine 10 to which water is supplied at 11 and concentrates A and B at 12 and 13, respectively, for the production of dialysis liquid which is supplied to a dia- lyzer 14 at one side of the membrane therein and is drawn off from the dialyzer at the same side of the membrane at 15 in order to be supplied to a drain through a conduit 16. At the other side of the membrane the dialyzer 14 is connected to the blood system of a patient through a hose 17 for diverting blood to the dialyzer. The blood is returned from said other side of the membrane to the patient through a hose 18. The hose 17, the dialyzer 14, and the hose 18 thus form an extracorporeal blood path in which the blood via the membrane in the dialyzer contacts the dialysis liq- uid in order that waste products existing in the blood shall pass through the membrane to the dialysis liquid by diffusion and convection.
For continuous measurement of the concentration of a certain substance or a combination of substances included in the waste products in the outgoing dialysis liquid there is mounted somewhere on the outlet conduit 16 of the dialyzer after the dialyzer inside or after the dialysis machine a transparent measuring cell 19 to which UV-light is supplied from a light source 20 through an optic fibre 21. Light which is supplied to the measuring cell and passes through said cell and dialysis liquid passing therethrough will be absorbed and scattered in a varying degree by the waste products existing in the dialysis liquid so that increased concentration of a substance in the dialysis liquid reduces the light transmission. The light passing through is diverted by an optic fibre 22 to a photodetector 23 to be transformed therein to an electric signal which via an algorithm including multiplication of the measured concentration by the existing flow of dialysis liquid will be converted into a signal the value of which is related to the content of a single substance in the waste products or a combination of several substances.
The signal is supplied to a computer 24 with a display 25 for visualisation of the measurement result, and a printer 26 for printing of the measurement result. In FIG.l a dot-and-dash line 27 indicates that the measurement result obtained can be transferred from the monitor to the dialysis machine for modification of the adjustment thereof as required by the measurement result. The light absorption due to waste products in the dialysis liquid flowing from the dialysis machine has been registered during the dialysis treatment at different wavelengths of the UV-light within the interval 180-380 nm, preferably 200-320 nm, by means of a spectrophotometer of the manufacture Kontron. The registration has taken place at different times after the beginning of the dialysis treatment, and the result is shown in FIG. 2. As will be seen the absorption is high, i.e. the concentration of waste products in the dialysis liquid is great, at the beginning of the dialysis treatment and then decreases continuously during 240 min. The continuously registered UV- absorption during a dialysis treatment is disclosed in FIG. 3 for the wavelength 280 nm.
In a chemical laboratory the concentration of certain important substances in the waste products, i.a. creatinine and urea, was measured and the measurement result is shown in FIG. 4. In the diagram shown therein, which discloses how the concentration of said substances varies over the time, also the UV-absorption at 280 nm is shown, and as will be seen, there is a good correlation between the graphs for urea and creatinine and the graph for UV-absorption.
The substances which occur as waste products in the dialysis liquid have been added to clean dialysate one at the time in concentrations which correspond to the concentrations existing in the dialysis liquid at dialysis, or higher, and spectrophotometric graphs have been recorded. As example there is shown in FIG. 5 the variation of the UV-absorption for urea, in FIG. 6 for creatinine and in FIG. 7 for hippuric acid. As will be gathered from the fig- ures the absorption varies for different substances. Thus, the absorption is higher for urea between 200 and 220 nm, for creatinine between 200 and 260 nm, and for hippuric acid between 200 and 280 nm. This means that there is a possibility to differentiate between different substances in the dialysis liquid and to obtain specific sensibility for a certain substance which it is desired to monitor for determining the content of waste products in the dialysis liquid. The object of the invention in the first place is to determine in a simple and reliable manner the content of waste products in the dialysis liquid in dialysis treatment in order that the patient by guidance thereof can be given an adequate dialysis treatment, but it is also possible to change in dependence of the measurement result the adjustment of the dialysis machine (feedback) in order to adapt the dialysis treatment to the special needs of the patient. By the possibility of choosing a certain substance for the monitoring of the dialysis treatment, exactly the substance can be chosen which is most suitable for the patient and is suitable for the election of dialyzer and the control of the dialysis machine.
In the described illustrative embodiment according to FIG. 1 the absorption of UV-light is measured, which passes through the outgoing dialysis liquid, but it is possible to measure instead according to known technique the UV-light which is reflected from the dialysis liquid. The light source 20, the measuring cell 19, and the photodetector 23 can be integrated to a unit except the optic fibres 21 and 22.
In the described embodiment the measurement on the dialysis liquid is effected continuously during the dialysis treatment but it is also possible to divert at intervals a minor quantity of the dialysis liquid and to measure on this quantity which is then sent to the drain. This sam- pling batch-wise can be totally automated. Such an embodiment is disclosed in FIG. 8. The measuring cell 19 is mounted in a shunt conduit 27 which is connected to the drain conduit 16 via a valve 28 at the inlet side of the measuring cell, and a valve 29 at the outlet side of the measuring cell. Valve 28 being open and valve 29 being closed a quantity of the outgoing dialysis liquid is taken from the drain conduit 16 into the measuring cell. After measuring on the dialysis liquid in the measuring cell as described above the valve 29 is opened to tap off the dialysis liquid in the measuring cell to the drain conduit. The valves as well as the measuring on the dialysis liquid in the measuring cell can be controlled automatically.

Claims

1. Method for determining in dialysis treatment the content of waste products in the outgoing dialysis liquid from the dialyzer, characterized in that the measurement of the concentration of a certain substance or a combination of substances included in the waste products is effected spectrophotometrically directly on the outgoing dialysis liquid from the dialyzer, and that the measurement value obtained is multiplied by the flow of dialysis liquid for determining the content of said substance or said combination of substances in the outgoing dialysis liquid from the dialyzer.
2. Method according to claim 1, characterized in that the measurement is effected continuously on the flow of dialysis liquid.
3. Method according to claim 1, characterized in that the measurement is effected regularly on a sample of the dialysis liquid taken from the flow of dialysis liquid.
4. Method according to any of claims 1-3, character- ized in that the spectrophotometric measurement is effected by means of UV-light.
5. Method according to claim 4 , characterized in that the wavelength of the UV-light is in the range 180-380 nm.
6. Method according to claim 5, characterized in that the wavelength of the UV-light is in the range 200-320 nm.
7. Method according to any of claims 1-6, characterized in that the measurement result is presented on a display and/or a printer.
8. Method according to any of claims 1-7, character- ized in that one or more parameters for the dialysis treatment are adjusted in dependence of the measurement result.
9. Method according to claim 8, characterized in that the adjustment is effected manually.
10. Method according to claim 8, characterized in that the adjustment is effected automatically.
11. Method according to any of claims 8-10, characterized in that the parameter which is adjusted is the blood flow in the extracorporeal blood path.
12. Method according to any of claims 8-10, characterized in that the adjustment of the parameters for the dialysis machine by means of which the dialysis treatment is effected are adjusted continuously in dependence of the measurement result .
13. Dialysis machine having a device for determining the content of waste products in the outgoing dialysis liquid from the dialyzer at the dialysis treatment, characterized in that after the dialyzer in or after the dialysis machine a measuring cell is provided for spectrophotometric measurement of the concentration of a certain substance or combination of substances included in the waste products, on the outgoing dialysis liquid from the dialyzer.
14. Dialysis machine according to claim 13, characterized in that the measuring cell is adapted to be continuously passed by the outgoing dialysis liquid.
15. Dialysis machine according to claim 13, characterized in that the measuring cell is mounted in a shunt conduit to a drain conduit for the outgoing dialysis liquid, and that means are provided for conducting periodically a sample of the dialysis liquid into the measuring cell and for draining the sample therefrom after effected measurement .
PCT/SE1999/000976 1998-06-04 1999-06-04 Method for determining waste products in the dialysis liquid in dialysis treatment Ceased WO1999062574A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP99927067A EP1083948B1 (en) 1998-06-04 1999-06-04 Method for determining waste products in the dialysis liquid in dialysis treatment
DE69916053T DE69916053T2 (en) 1998-06-04 1999-06-04 PROCESS AND DETERMINATION OF WASTE PRODUCTS IN DIALYSIS LIQUIDS DURING DIALYSIS TREATMENTS
AT99927067T ATE262932T1 (en) 1998-06-04 1999-06-04 METHOD AND DETERMINATION OF WASTE PRODUCTS IN DIALYSIS FLUIDS DURING DIALYSIS TREATMENTS
US09/700,849 US6666840B1 (en) 1998-06-04 1999-06-04 Method for determining waste products in the dialysis liquid in dialysis treatment
JP2000551827A JP2002516722A (en) 1998-06-04 1999-06-04 Method for determining waste products in dialysate in dialysis treatment

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9801983-9 1998-06-04
SE9801983A SE525639C2 (en) 1998-06-04 1998-06-04 Determination of slag products in dialysis fluid by means of optical sensor

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