Structural Integrity of Absorbable Gelatin Sponges for Middle Ear Packing in Otologic Surgery

Area of Science:

• Otolaryngology
• Biomaterials Science
• Surgical Materials

Background:

• Absorbable gelatin sponges are vital in otologic surgery for hemostasis and reconstruction scaffolding.
• The dissolution rate of these sponges can impact the success of tympanic membrane closure and surgical outcomes.

Purpose of the Study:

• To investigate and quantify the physical property changes of two types of gelatin sponges upon immersion in otologic solutions.
• To compare the volume loss, compressibility, and porosity of standard-density and low-density gelatin sponges.

Main Methods:

• An in vitro study comparing standard-density and low-density gelatin sponges.
• Sponges were immersed in 0.9% saline, ciprofloxacin, dexamethasone, or a combination otic solution.
• Volume loss was measured at timed intervals up to 5 days; compressibility and porosity were also analyzed.

Main Results:

• Low-density sponges exhibited significantly greater volume loss than standard-density sponges across all tested solutions and time points.
• Both sponge types lost nearly half their volume in saline within 15 minutes compared to otic solutions.
• Standard-density sponges in otic solutions (ciprofloxacin, dexamethasone, or combination) best retained structural integrity.

Conclusions:

• Standard-density gelatin sponges demonstrate superior structural integrity when immersed in common otologic solutions.
• The choice of gelatin sponge density and immersion solution affects material stability, potentially influencing surgical success.
• Further in vivo studies are recommended to evaluate hemostatic properties and surgical outcomes.