Ultrasound guided hernia blocks. cord for the genital branch of genitofemoral nerve block. U. Ultrasound-guided spermatic cord block for scrotal surgery. The spermatic cord block is a nerve block that works much the same way a nerve block for back pain works. Independence Day Offer! 20% off* Top TCI SuperCoder Products | Use Code: ID20 >> Offer Ends Soon. The surgeon cuts the nerve structures in the cord, but preserves blood and lymphatic supply to the testicle. The technically challenging procedure takes from 45 to 90 minutes, Dr. Shoskes says. The surgery has a percent .