Experimental Investigation into the Effect of Variable Inflation Intervals on Capsule Thickness in Tissue Expander

Area of Science:

• Plastic Surgery
• Biomaterials Science
• Regenerative Medicine

Background:

• Capsular contracture around tissue expanders complicates reconstruction.
• Increased capsule thickness prolongs expansion time and affects flap outcomes.

Purpose of the Study:

• To evaluate the impact of varying inflation intervals and volumes on capsule thickness.
• To determine the optimal tissue expander inflation strategy for breast reconstruction.

Main Methods:

• Elliptical tissue expanders were implanted in 15 rats and inflated at different intervals (daily, every 3 days, every 10 days).
• Capsule thickness, vascularization, and flap size were measured.
• Histopathological and immunohistochemical analyses were performed on tissue biopsies.

Main Results:

• Daily inflations (Group 1) resulted in the smallest skin flaps (81 cm²).
• The thickest capsule was observed with 3-day intervals (Group 2).
• 10-day intervals (Group 3) showed the densest vascularization and highest histiocyte density.

Conclusions:

• Frequent, small-volume inflations reduce capsule thickness but compromise flap size.
• Less frequent, larger-volume inflations may be preferable for maximizing flap size and minimizing capsular fibrosis.
• This strategy could benefit patients with radiotherapy/chemotherapy history or fibrosis predisposition.