Host response to implanted dacron grafts. A comparison between mesh and velour

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Surgical Innovation

Background:

• Dacron mesh and velour are used as vascular grafts.
• Understanding host response to graft materials is crucial for clinical success.

Purpose of the Study:

• To compare the host tissue response to open Dacron mesh versus low-porosity Dacron velour grafts.
• To evaluate the healing timeline and histological characteristics of subcutaneous implants.

Main Methods:

• Subcutaneous implantation of Dacron mesh and velour segments in rats.
• Serial harvesting of grafts up to 12 weeks post-implantation.
• Gross and histological examination of host response and graft integration.

Main Results:

• Open Dacron mesh demonstrated rapid integration with mature collagen and vascularization within 3-4 weeks.
• Low-porosity Dacron velour exhibited delayed healing, with grafts floating in caseous material for up to 5 weeks.
• Inflammatory response and debris in velour grafts slowly resolved over 10 weeks, suggesting prolonged healing.

Conclusions:

• Open Dacron mesh facilitates a robust and rapid host tissue response.
• Low-porosity Dacron velour's delayed healing may be linked to inflammatory processes and debris accumulation.
• The distinct healing patterns may influence long-term graft patency and contracture.