A priority scheme is provided for ports assigned to respective channel units in a channel bank. The adapter, which is torque-proof, displacement-resistant and coupleable with a fastening section of the mirror unit, can balance the diameter difference between the fastening section of the mirror unit and the tubular frame section. Crosslinking of the chain-extended polyamine products with an oxidized polysaccharide provides useful tissue adhesives with modified elasticity, that provides greater compliance to underlying tissue, and improved stability in aqueous environments.