New magnetic-resonance-imaging-visible poly(ε-caprolactone)-based polyester for biomedical applications

Area of Science:

• Biomaterials Science
• Medical Imaging
• Polymer Chemistry

Background:

• Conventional magnetic resonance imaging (MRI) faces limitations in visualizing implantable medical devices.
• Developing MRI-compatible materials is crucial for advanced medical diagnostics and patient monitoring.

Purpose of the Study:

• To synthesize a novel MRI-visible degradable polymer for enhanced visualization of implantable medical devices.
• To evaluate the efficacy and safety of the developed polymer for long-term in vitro MR imaging.

Main Methods:

• Grafting a magnetic resonance (MR) contrast agent (DTPA-Gd) onto a biocompatible and degradable poly(ε-caprolactone) (PCL) backbone.
• Characterization of the polymer's substitution degree using (1)H nuclear magnetic resonance and inductively coupled plasma-mass spectrometry.
• Coating the synthesized polymer onto a commercial mesh for tissue reinforcement and assessing its MR visibility and stability over time.

Main Results:

• Successful synthesis of a DTPA-Gd-PCL polymer with a substitution degree of approximately 0.5%.
• Demonstrated strong and clear T1 contrast enhancement, enabling clear in vitro MR visualization of the coated mesh for over 1 year.
• Stability studies confirmed minimal gadolinium release from the polymer over 52 weeks, indicating device safety.

Conclusions:

• The novel MRI-visible degradable polymer shows significant potential for the MR visualization of implantable medical devices.
• This technology can improve post-operative patient management by enabling clear imaging of implanted materials.
• The developed polymer offers a safe and effective solution for enhancing the diagnostic capabilities of MRI in the context of medical implants.