Apparatus for extracorporeal blood or plasma treatment comprising a wet semi-permeable membrane and methods for making the same
View Patent ↗The present invention relates to a device for the extracorporeal treatment of blood or plasma, comprising two compartments, one compartment intended for circulating blood or plasma, and one compartment intended for circulating spent liquid, separated by a wet semi-permeable membrane, characterized in that the device has, before and after sterilization, the following technical characteristics: the membrane is impregnated with an aqueous glycerol solution; the aqueous glycerol solution contains from 7% to 15% by weight of glycerol and is free of toxic chemical compounds; the two compartments are purged of the aqueous glycerol solution. The present invention also relates to processes for manufacturing this device.
1. A process for limiting risks of leakage and variations in a water permeability of a device for the extracorporeal treatment of blood or plasma, said device being subjected to a temperature below 0° C., and comprising, a first compartment configured to circulate blood or plasma, and a second compartment configured to circulate spent liquid, said first and second compartments being separated by a semi-permeable membrane, said semi-permeable membrane being stored in a wet state, said process comprising the steps of:
preparing an aqueous glycerol solution having a concentration of 7% to 15% by weight of glycerol and being free of chemical compounds that are toxic before or after high-energy sterilization;
placing the aqueous glycerol solution in contact with the semi-permeable membrane;
purging the device of the aqueous glycerol solution; and
sterilizing the device with higher energy sterilization.
2. A process according to claim 1 , wherein the step of placing the aqueous glycerol solution in contact with the semi-permeable membrane by circulating the aqueous glycerol solution in the first compartment.
3. A process according to claim 1 , wherein the step of placing the aqueous glycerol solution in contact with the semi-permeable membrane by circulating the aqueous glycerol solution in the second compartment.
4. A process according to claim 1 , wherein the step of placing the aqueous glycerol solution in contact with the semi-permeable membrane by circulating the aqueous glycerol solution in the first compartment and the second compartment.
5. A process according to claim 1 , wherein said high-energy sterilization includes exposure of said aqueous glycerol solution to gamma irradiation.
6. A process for limiting risks of leakage and variations in a water permeability of a device for extracorporeal treatment of blood or plasma, said device being subjected to a temperature below 0° C., and comprising, a first compartment configured to circulate blood or plasma, and a second compartment configured to circulate spent liquid, said first and second compartments being separated by a semi-permeable membrane, said semi-permeable membrane being stored in a wet state, said process comprising the steps of:
preparing a solution having one or more chemical compounds, said one or more chemical compounds improving the biocompatibility of the membrane;
placing said solution in contact with a surface of the membrane, said surface being configured to be placed in contact with blood or plasma;
mounting the membrane with improved biocompatibility in a housing;
preparing an aqueous glycerol solution having a concentration of glycerol from 7% to 15% by weight and being free of chemical compounds that are toxic before or after a high-energy sterilization;
placing the aqueous glycerol solution in contact with the semi-permeable membrane;
purging the device of the aqueous glycerol solution; and
sterilizing the device with higher energy sterilization.
7. A process according to claim 6 , wherein said high-energy sterilization includes exposure of said aqueous glycerol solution to gamma irradiation.
8. A process for limiting risks of leakage and variations in a water permeability of a device for extracorporeal treatment of blood or plasma, said device being subjected to a temperature below 0° C., and comprising, a first compartment configured to circulate blood or plasma, and a second compartment configured to circulate spent liquid, said first and second compartments being separated by a semi-permeable membrane, said semi-permeable membrane being stored in a wet state, said process comprising the steps of:
mounting the membrane in a housing;
preparing a solution having one or more chemical compounds, said compounds improving a biocompatibility of the membrane;
placing said solution in contact with a surface of the membrane, said surface being configured to be placed in contact with blood or plasma;
preparing an aqueous glycerol solution having a concentration of glycerol from 7% to 15% by weight and being free of chemical compounds that are toxic before or after a high-energy sterilization;
placing the aqueous glycerol solution in contact with the semi-permeable membrane;
purging the device of the aqueous glycerol solution; and
sterilizing the device with higher energy sterilization.
9. A process according to claim 8 , wherein said high-energy sterilization includes exposure of said aqueous glycerol solution to gamma irradiation.