Water-Permeable Dialysis Membranes for Multi-Layered Microdialysis System

Area of Science:

• Biomaterials Engineering
• Medical Devices
• Renal Replacement Therapy

Background:

• Traditional dialysis systems require external pumps and fluid storage, limiting patient mobility and quality of life.
• Hemofiltration offers a potential alternative by utilizing water-permeable membranes, eliminating the need for dialysis fluid.
• Developing robust and efficient water-permeable membranes is critical for fluid-free dialysis applications.

Purpose of the Study:

• To develop and evaluate a fully implantable microdialysis system for fluid-free hemofiltration.
• To optimize polyethersulfone (PES) membrane properties for efficient water permeability and selective molecule removal.
• To validate the system's efficacy and safety in preclinical models of renal failure.

Main Methods:

• Fabrication of nanoporous polyethersulfone (PES) membranes with controlled water permeability.
• In vitro testing using bovine blood to assess membrane filtration performance and selectivity.
• In vivo implantation in a rat model with induced renal failure to evaluate system effectiveness in vivo.

Main Results:

• Optimized PES membranes demonstrated sufficient water permeability for hemofiltration.
• In vitro tests confirmed selective removal of low-molecular-weight solutes (urea, creatinine) while retaining proteins (albumin).
• In vivo studies showed successful filtrate collection without leakage, with solute concentrations matching blood levels and significant reduction in creatinine increase in renal failure models.

Conclusions:

• The developed implantable microdialysis system utilizing water-permeable PES membranes is effective for fluid-free hemofiltration.
• The system shows promise for improving the quality of life for patients requiring renal replacement therapy.
• Further development could lead to a new generation of implantable dialysis devices.