[Small-caliber arterial prosthesis: effect of porosity]

Area of Science:

• Vascular Surgery
• Biomaterials Science
• Histopathology

Background:

• Vascular prostheses are crucial for replacing damaged arteries.
• Evaluating the biocompatibility and performance of different graft materials is essential for improving surgical outcomes.
• Human umbilical vein and Dacron grafts are potential options for carotid artery reconstruction.

Purpose of the Study:

• To compare the histological organization and permeability of pyrolytic carbon-coated Dacron grafts versus glutaraldehyde-treated human umbilical vein segments implanted in canine carotid arteries.

Main Methods:

• Implantation of 32 Dacron grafts and 32 human umbilical vein segments into canine carotid arteries.
• Explantation of prosthesis segments at intervals from 10 to 120 days.
• Examination using standard optical microscopy and scanning electron microscopy for surface analysis.

Main Results:

• Overall permeability was 93.7% for Dacron prostheses and 84.3% for human umbilical vein.
• Both graft types demonstrated comparable fundamental stages of pseudo-intima organization over time.
• Scanning electron microscopy revealed surface characteristics of tissue integration.

Conclusions:

• Dacron prostheses exhibit higher permeability compared to human umbilical vein segments.
• Both materials support pseudo-intima formation, suggesting comparable biocompatibility for carotid artery applications.
• Further research may optimize graft design for reduced permeability while maintaining favorable tissue integration.