PIP: The described procedure aims at providing a subfertile sperm count by obstructing the lumen of the vas deferens by a wire made of nonreactive synthetic material which can be removed easily to restore fertility. This is a preliminary report of 2 cases. Thick nylon wire, the size of chromic catgut no 1, was used as the IVCD. With an eyeless needle the wire was inserted for about 3 cm into the lumen of the vas across a transverse vastotomy incision. Each end was brought out and knotted. Black silk thread was used as a marker for identification. The vasotomy and other structures were closed and an antibiotic given. In 1 patient, in whom 2 parallel wires were inserted, the sperm count was reduced from an average of 75 million per ml with 70% motility to 3 million per ml with 30% motility while the IVCD was in place for 20 weeks. After removal the sperm count rose in 6 weeks to an average of 60 million per ml with a motility of 70%. A second patient with similar preoperative sperm count continues with the IVCD in place with an average of 12.3 million sperm count per ml. It is considered that sperm counts resulting are below fertility level. Other synthetic materials are being studied. An IVCD with a needle on each end is now available to facilitate insertion.