Studies on two new radiopaque polymeric biomaterials

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Medical Imaging

Background:

• Development of radiopaque materials is crucial for visualizing medical implants using X-ray imaging.
• Existing radiopaque materials may have limitations in biocompatibility or imaging performance.

Purpose of the Study:

• To synthesize and characterize two new iodine-containing polymeric materials (polymers A and B) for potential use as radiopaque implant biomaterials.
• To evaluate the hemocompatibility and radiopacity of these novel polymers.

Main Methods:

• Polymer synthesis involving methyl methacrylate (MMA), an iodinated compound (1), and 2-hydroxyethyl methacrylate (HEMA) for Polymer B.
• Characterization using Gel Permeation Chromatography (GPC), Differential Scanning Calorimetry (DSC), Nuclear Magnetic Resonance (NMR), and contact angle measurements.
• In vitro thrombogenicity testing via thrombin generation assays and platelet activation studies.
• Assessment of radiopacity using routine clinical X-ray imaging techniques.

Main Results:

• Both polymers A and B exhibited good radiopacity, visible even as fine fibers (0.3 mm diameter).
• Polymer B showed significantly lower thrombin generation (64 +/- 3 nM) and longer lag times (553 s) compared to Polymer A (76 +/- 1 nM, 392 s), indicating superior hemocompatibility.
• Polymer B did not induce platelet activation, while Polymer A showed minor activation.
• Polymer B's hemocompatibility was comparable to the passive material PVC-T (lag time 583 s).

Conclusions:

• The synthesized iodine-containing polymers exhibit promising radiopacity for medical implant applications.
• Polymer B demonstrates excellent hemocompatibility, making it a highly suitable candidate for radiopaque implantable devices.
• Further investigation into the clinical performance of these materials is warranted.