An improved method of closed irrigation-suction system for treatment of bone and joint infections is considered essential for the prevention of obstruction of the tube. Crisscross flow-reversal system with double tubes was used. Furthermore, channel changer system for the reversal flow was made. Among 172 treated cases, 148 (86.0%) were successful, 7 cases (4.1%) were improved, and 17 cases (9.9%) were failures. Electric detector for the leak of the solution was made.
