Biodegradable Polydioxanone Microspheres for Transcatheter Arterial Embolization: Proof of Principle

Area of Science:

• Biomaterials Science
• Interventional Radiology
• Nephrology

Background:

• Transcatheter arterial embolization is a key interventional radiology procedure.
• Biodegradable embolic agents are sought for temporary vessel occlusion and controlled reperfusion.
• Polydioxanone (PDO) is a biocompatible polymer with known degradation properties.

Purpose of the Study:

• To assess the feasibility, success, biodegradability, reperfusion, and biocompatibility of polydioxanone microspheres (PDO-MS) for transcatheter arterial embolization.
• Evaluate PDO-MS as a potential temporary embolic agent.

Main Methods:

• Unilateral renal artery embolization using PDO-MS (100-150 μm and 90-315 μm) in 16 rabbits.
• Post-embolization imaging (DSA, MR) at various time points (immediate to 16 weeks).
• Macroscopic and histologic analysis of kidneys to evaluate embolization, degradation, and biocompatibility.

Main Results:

• Technical success in 15/16 rabbits; embolization success confirmed by imaging in 13/15.
• Smaller PDO-MS (100-150 μm) showed easier catheter passage than larger ones (90-315 μm).
• Effective embolization led to renal infarction; MS extensively degraded by 16 weeks with mild inflammatory response. Reperfusion observed starting week 1, complete by week 8.

Conclusions:

• Biodegradable PDO-MS are feasible and effective for renal artery embolization.
• PDO-MS demonstrate good biocompatibility and gradual degradation, supporting their use as temporary embolic agents.
• The observed reperfusion profile suggests potential advantages over permanent embolic materials.