In vitro study of drug-loaded bioresorbable films and support structures

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Regenerative Medicine

Background:

• Bioresorbable films offer dual functionality as support structures and drug delivery systems.
• Poly(L-lactic acid) (PLLA) is a promising material for medical implants due to its biocompatibility and degradability.

Purpose of the Study:

• To develop and characterize bioresorbable PLLA films and stents containing dexamethasone for potential use in supporting body conduits.
• To evaluate the mechanical properties, degradation behavior, and drug release kinetics of these PLLA-based devices.

Main Methods:

• Solution processing of PLLA films incorporating dexamethasone.
• In vitro mechanical testing, morphological analysis, and degradation studies.
• Assessment of drug release profiles and stent performance under radial compression.

Main Results:

• PLLA films exhibited good initial mechanical properties and accommodated dexamethasone incorporation.
• Water incubation led to decreased mechanical properties due to degradation and morphological changes.
• Dexamethasone release was linear and dependent on film structure; stents showed good mechanical properties and potential for supporting conduits over 20 weeks.

Conclusions:

• Bioresorbable PLLA films and stents are viable for drug delivery and structural support applications.
• The mechanical integrity and degradation of these devices can be tailored by polymer structure and drug incorporation.
• These findings support the potential clinical application of these stents for conditions like neonatal tracheal malacia.