Biodegradable phosphorylcholine copolymer for cardiovascular stent coating.

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Medical Device Engineering

Background:

• Phosphorylcholine (PC) based polymers are known for excellent biocompatibility in medical applications like drug-eluting stents.
• A key limitation for biodegradable stents is the poor degradability of current PC-based polymer coatings.
• Developing biodegradable alternatives is crucial for advancing stent technology.

Purpose of the Study:

• To synthesize a novel biodegradable phosphorylcholine copolymer for stent coatings.
• To investigate the copolymer's properties, including biocompatibility, degradability, and drug-eluting capacity.
• To evaluate the potential of this new copolymer for biodegradable stent applications.

Main Methods:

• Utilized one-step radical ring-opening polymerization (RROP) to synthesize the copolymer.
• Incorporated phosphorylcholine (PC), 2-methylene-1,3-dioxepane (MDO), and butyl methacrylate (BMA) monomers.
• Controlled copolymer composition by adjusting monomer ratios during polymerization.
• Fabricated stable coatings using ultrasonic spray deposition.
• Assessed blood compatibility, anti-adhesion, biodegradability, and drug (rapamycin) elution.

Main Results:

• Successfully synthesized a biodegradable PC copolymer with controllable monomer ratios (e.g., 34% MDO, 19% PC, 47% BMA).
• The resulting copolymer formed stable coatings via ultrasonic spray.
• Demonstrated excellent blood compatibility and anti-adhesion properties.
• Confirmed biodegradability and effective rapamycin elution capacity.
• In vivo studies indicated promising performance as a biodegradable stent coating.

Conclusions:

• A facile method was developed to create biodegradable PC-based polymers via RROP.
• The synthesized copolymer exhibits a desirable combination of biocompatibility, biodegradability, and drug delivery potential.
• This biodegradable PC copolymer shows significant promise for advanced biodegradable stent applications.