Gauze
A thin transparent fabric of silk, linen, or cotton.
Wrapping with plastic resin or other polymer: maybe slightly better than muscle or gauze 1).
1)
Cossu M, Pau A, Turtas S, et al. Subsequent Bleeding from Ruptured Intracranial Aneurysms Treated by Wrapping or Coating: A Review of the Long-Term Results in 47 Cases. Neurosurgery. 1993; 32:344–347