Tailored Biodegradable Copolymers With Random-Block Architecture for High-Performance Absorbable Tissue Ligation...

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Surgical Innovation

Background:

• Current absorbable tissue ligation clips face challenges in balancing mechanical strength and flexibility.
• There is a need for advanced biodegradable polymers to improve surgical device performance.

Purpose of the Study:

• To develop a novel random-block copolymer, poly(L-lactide-r-ε-caprolactone)-b-poly(L-lactide) (PLCL-b-PLLA), for enhanced absorbable tissue ligation clips.
• To evaluate the mechanical properties, degradation behavior, and biocompatibility of clips fabricated from this new copolymer.

Main Methods:

• Synthesis of three random-block PLCL-b-PLLA copolymers with varying LLA/CL ratios.
• Fabrication of Hem-o-lok-shaped clips from the optimized copolymer (PLC75-RB).
• Assessment of closure force, rebound ability, degradation profile, and histological analysis in a rabbit unilateral nephrectomy model.

Main Results:

• The PLC75-RB copolymer demonstrated a balanced combination of mechanical strength and flexibility.
• The CLIP75-RB clips exhibited sufficient closure force and favorable rebound ability for tissue ligation.
• CLIP75-RB maintained effective closure force for 4 weeks, followed by gradual degradation with good biocompatibility observed in vivo.

Conclusions:

• The developed random-block PLCL-b-PLLA copolymers offer a promising platform for next-generation absorbable surgical clips.
• The PLC75-RB copolymer provides a well-matched balance of mechanical performance and degradation characteristics for tissue ligation applications.