Experience with fully bioresorbable aortic grafts in the dog

Area of Science:

• Biomaterials Science
• Vascular Surgery
• Tissue Engineering

Background:

• Vascular grafts are crucial for replacing damaged arteries.
• Bioresorbable materials offer potential advantages over permanent grafts.
• Controlling the degradation rate of bioresorbable grafts is key for successful tissue integration.

Purpose of the Study:

• To investigate arterial wall reorganization around bioresorbable grafts.
• To evaluate the effect of different polyester coatings on Vicryl prostheses disintegration.
• To assess the long-term patency and tissue integration of modified bioresorbable vascular grafts.

Main Methods:

• Implantation of Vicryl prostheses with and without bioresorbable polyester coatings in the canine infrarenal aorta.
• Evaluation of graft performance and tissue response over 24 weeks.
• Histological analysis of tissue layers formed around the grafts.

Main Results:

• All animals with coated prostheses survived, while one with an uncoated graft experienced early rupture.
• Patent tubular conduits were observed in 14 out of 18 animals with coated grafts.
• The composition of the polymer coating influenced whether surrounding tissue layers fused or remained separated upon graft resorption.

Conclusions:

• Polymer composition significantly impacts the tissue repair process around bioresorbable vascular grafts.
• A fully resorbable vascular graft can function effectively in a canine model if tissue organization is adequate before mechanical integrity is lost.
• Further research is required to assess long-term performance, efficacy in hypertensive models, and resistance to bacterial challenges.