If both sides be completely obstructed, the only method to adopt is catheterization from the mouth.
catheterize cath·e·ter·ize (kāth'ĭ-tə-rīz')
v. cath·e·ter·ized, cath·e·ter·iz·ing, cath·e·ter·iz·es
To introduce a catheter into.
Insertion of a catheter into the body. Common types of this procedure include cardiac catheterization, in which a catheter is inserted into the heart through a vein in the arm to diagnose heart disease, and urinary bladder catheterization, in which a catheter is inserted into the urethra to permit urine to flow out of the urinary bladder.