Hello,
What is the cause of his spermatic cord blockage? The spermatic cord transports the sperm from each testis to the penis and any blockages will cause infertility. The common causes are vasectomy, infection and some sexually transmitted diseases. It is important to treat the cause for expecting results. You may need a complete evaluation by a urologist. Treatment will depend on the cause. I hope it helps.
Best luck and kind regards!