A new absorbable annuloplasty ring in the tricuspid position: an experimental study

Area of Science:

• Biomaterials Science
• Cardiovascular Surgery
• Veterinary Medicine

Background:

• Annuloplasty is a crucial surgical procedure for treating tricuspid regurgitation.
• Current annuloplasty rings lack inherent biodegradability, necessitating future removal or causing long-term complications.
• Bovine fibrin presents a potential biodegradable material for cardiac implants.

Purpose of the Study:

• To evaluate the absorption rate and efficacy of an absorbable bovine fibrin annuloplasty ring.
• To assess the biocompatibility and tissue response to the biodegradable ring in a canine model.

Main Methods:

• An absorbable bovine fibrin annuloplasty ring was implanted in the tricuspid position of 30 adult mongrel dogs.
• Animals were followed for up to one year, with specimens analyzed at various time points (14 days to 12 months).
• Histopathological examination assessed ring absorption, tissue integration, and potential adverse effects.

Main Results:

• Complete absorption of the bovine fibrin ring was observed in most dogs within two months post-implantation.
• Mild to moderate surface erosion and fibrinous capsule formation were noted in early stages (2-4 weeks).
• Chondroid degeneration was detected in two cases at four months, indicating a potential localized tissue response.

Conclusions:

• The bovine fibrin annuloplasty ring demonstrates rapid and complete absorption in a canine model.
• This biodegradable annuloplasty concept shows potential for future clinical applications in cardiac surgery.
• Further research is warranted to fully establish safety and efficacy prior to human trials.