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Engineering the tissue which encapsulates subcutaneous implants. II. Plasma-tissue exchange properties
A A Sharkawy1, B Klitzman, G A Truskey
1NSF Center for Emerging Cardiovascular Technology, Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708-0295, USA.
Journal of Biomedical Materials Research
|May 23, 1998
Summary
Implant porosity significantly impacts vascularization. Optimal pore sizes, around cellular dimensions, enhance blood vessel growth in surrounding tissues, crucial for long-term implants.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Medical Device Development
Background:
- Capsular tissue formation around implants affects their function.
- Implant porosity is a key factor influencing the host response.
- Understanding plasma-tissue exchange is vital for implant integration.
Purpose of the Study:
- To assess plasma-tissue exchange in capsular tissue around implants.
- To determine the effect of implant porosity on vascularization and permeability.
- To identify optimal pore sizes for enhanced neovascularization.
Main Methods:
- Rats were implanted with polyvinyl alcohol (PVA) and polytetrafluoroethylene (PTFE) implants of varying pore sizes.
- Intravascular injection of a fluorophore tracer (rhodamine) assessed vessel permeability.
- Fluorescence and brightfield microscopy quantified vascular density and tracer extravasation.
Main Results:
- Vessel permeability was not significantly affected by implant pore size.
- Porous implants showed higher vascular density than nonporous ones.
- Pore sizes near cellular dimensions (e.g., PVA-60) significantly increased vascular density.
Conclusions:
- Implant pore size is a critical factor for engineering optimal vascular density.
- Tailoring pore size can improve the integration of long-term implants.
- This finding is relevant for applications like sensors and cell-based therapies.