In 1901, Dr. Jean E. Sicard has approached the first trial of sacral (Epidural) Anesthesia, aiming to ease sciatica of a patient.
Dr. Achille M. Dogliotti reported his research on procedure to inject regional anesthesic agent into epidural space. This procedure was widely introduced to Europe and South America.
Dr. William Lemmon attempted continuous Spinal Anesthesia, using 17gauge flexible silver needle through a hole placed in the middle of surgical table.
In 1944, Dr. Tuohy had improved the problem of this method (fixation of needle) by indwelling ureteral catheter into subarachnoid cavity through 15gauge Huber point spinal needle, and implemented Continuous Spinal Anesthesia.
Later, this method had become the origin of Epidural Anesthesia.