Search

The histopathological aspects of the testis in rat after intra-serous proximal hemideferentectomy and end-to-end tubulo-vasostomy are evaluated. The histomorphometric variations of the convoluted seminiferous tubules and the quantitative modifications of the stages of spermatogenesis are correlated with the obstruction's degree of the tubulo-deferential anastomosis.

The sterilization of the male by vasectomy receives increasing acceptance in this country as part of family planning in general. Current laws and bylaws are lacking. The present procedures, indications and methods for vasectomy for fertility are described and discussed. This type of vasectomy differs in some points from vasectomy for other therapeutic indications. Noticeable complications, especially immunologic complications were not observed and were not detectable by immunologic testing of 23 men. Since all attempts to achieve a temporary occlusion of the vas have failed, vasectomy for the control of fertility is irreversible, in the majority of the cases. It is therefore advisable to deposit semen in sperm banks in these cases. The success rate of re-anastomosis of the vas to the vas or the vas to the epididimus varies between 10 and 30%.

This study was undertaken for the purpose of comparing reversibility following long-term sperm obstruction with that following long-term sperm diversion. The rabbit served as the animal model. Sperm obstruction was produced by transection and ligation of the vasa deferentia near the vasal ampulla; sperm diversion by transection of vasa and anastomosis of afferent limb with urinary bladder. After one year. vasal continuity was reestablished by end-to-end vasovasostomy. Restoration of fertility was more successful after sperm diversion than after sperm obstruction. It is concluded that vasocystostomy in the rabbit is a safe and effective method of male fertility control with greater probability for successful reversal than conventional vasectomy.

Vasectomy is a safe and effective method of male sterilization. The procedure and necessary follow-up care can usually be performed in an office setting. Failure of the procedure may be due to incorrect identification of the vas, recanalization or presence of an accessory vas.

In contrast to the results with rigid-ended prosthetic devices implanted in the vas deferens of the dog, effective sperm transport was obtained for prolonged periods of time with flexible-ended (all soft) devices. Such transport could be halted by device occlusion with clips or shuttle stem valves. Opening the devices resulted once again in the passage of spermatozoa, indicating that these devices may be potentially useful as reversible male contraceptives. More research is necessary to determine the cause of an overall decrease in sperm output after device implantations and to evaluate any adverse side effects of such devices. Dacron velour-covered suture rings on the devices permitted effective tissue ingrowth and prevented leakage or recanalization.

Bilateral vasectomy was performed in 30 men. The vasa were tied with radio-opaque ligatures and X-rays taken to assess the separation of the ends. There was good correlation between the length of vas excised and the resulting separation of the markers. In order to achieve a separation greater than that of sperm granulomas associated with vasectomy failure, at least 7 cm of vas would have to be removed. However, excision of this length cannot be recommended because of subsequent difficulties with vasovasostomy. It is suggested that as well as excising a length of vas during vasectomy, a second method is also used to prevent spontaneous recanalisation.