“…Saline solution was chosen because it has previously been evaluated 12 and because of its iso-osmolarity, ready availability, and low cost. Sodium hyaluronate, a high-molecular-weight, sterile, isotonic solution, was chosen on the basis of earlier experiences in our laboratory 4 and because of existing literature suggesting that high-molecular-weight fluids are less likely to diffuse through the silicone membrane of the HO. 10 Hydraulic occluders were prepared as described.…”