Related Experiment Video
Updated: May 25, 2026
08:02
Thin Film Composite Silicon Elastomers for Cell Culture and Skin Applications: Manufacturing and Characterization
Published on: July 3, 2018
Biocompatibility properties of surface-modified poly(dimethylsiloxane) for urinary applications
Evi Lippens1, Nele De Smet, Stijn Schauvliege
1Department of Basic Medical Sciences, Ghent University, Belgium.
Journal of Biomaterials Applications
|January 26, 2012
Summary
Researchers modified poly(dimethylsiloxane) (PDMS) surfaces to prevent salt buildup in urinary bladder sensors. Grafting specific monomers significantly reduced salt deposition, improving biocompatibility for medical implants.
Area of Science:
- Biomaterials Science
- Surface Chemistry
- Medical Device Engineering
Background:
- Electronic sensor systems for urinary bladder pressure monitoring require biocompatible, flexible, and liquid-impermeable packaging materials.
- Poly(dimethylsiloxane) (PDMS) is suitable but its hydrophobic surface leads to undesirable interactions with urine components like salts, proteins, and cells.
- Reducing these interactions is crucial for the long-term function and safety of implanted bladder sensors.
Purpose of the Study:
- To modify the surface properties of PDMS to minimize salt deposition from urine.
- To evaluate the effectiveness of surface modification in reducing salt accumulation in vitro and in vivo.
- To assess the biocompatibility of the modified PDMS for potential use in urinary bladder implants.
Main Methods:
- Oxygen plasma treatment was used to activate the PDMS surface for grafting.
- Two specific monomers, sulfobetaine and 2-acrylamido-2-methylpropyl sulfonic acid, were grafted onto the PDMS surface.
- Salt deposition was measured using artificial urine flow in vitro and by implanting modified PDMS into the urinary bladders of experimental pigs in vivo.
- Biocompatibility was assessed through cell cultures and histological examination of bladder tissues.
Main Results:
- Surface grafting of sulfobetaine and 2-acrylamido-2-methylpropyl sulfonic acid significantly reduced salt deposition on PDMS.
- A 10-fold reduction in salt deposition was observed in vitro compared to unmodified PDMS.
- In vivo studies in pigs also demonstrated a reduction in salt accumulation on the modified PDMS implants.
- The modified PDMS materials exhibited good biocompatibility in cell culture and histological assessments.
Conclusions:
- Surface modification of PDMS with specific zwitterionic monomers effectively reduces urine salt deposition.
- The modified PDMS demonstrates improved performance and biocompatibility for urinary bladder pressure monitoring sensor applications.
- This approach offers a promising strategy for developing more durable and reliable implantable electronic devices for urological applications.
