Various approaches to modify biomaterial surfaces for improving hemocompatibility

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Biomedical Engineering

Background:

• Thrombus formation on polymeric materials is a critical issue for blood-contacting medical devices.
• Improving biomaterial hemocompatibility is essential for reducing adverse blood reactions.
• Surface modification strategies are key to enhancing the biocompatibility of medical implants.

Purpose of the Study:

• To review mechanisms of thrombus formation on polymeric materials.
• To investigate the blood compatibility of cellulose membranes grafted with O-butyrylchitosan (OBCS).
• To evaluate OBCS as a potential surface modification for hemocompatible biomaterials.

Main Methods:

• Radiation grafting technique used to graft OBCS onto cellulose membranes.
• Surface analysis performed using attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) and electron spectroscopy for chemical analysis (ESCA).
• Blood compatibility assessed via platelet rich plasma (PRP) contacting experiments and protein adsorption studies.

Main Results:

• ATR-FTIR and ESCA confirmed successful grafting of OBCS onto cellulose membrane surfaces.
• OBCS-grafted cellulose membranes exhibited improved blood compatibility compared to blank cellulose membranes.
• Reduced platelet adhesion and altered protein adsorption patterns were observed on modified surfaces.

Conclusions:

• O-butyrylchitosan (OBCS) grafting significantly enhances the hemocompatibility of cellulose membranes.
• The radiation grafting technique provides an effective method for surface modification.
• Photocrosslinkable chitosan derivatives show promise for blood-contacting medical applications.