Diagram showing the site of injection of the product Vasalgel, a vasectomy alternative<unk>  (RISUG), formerly referred to as the synthetic polymer styrene maleic anhydride (SMA), is the development name of a male contraceptive injection developed at IIT Kharagpur in India by the team of Dr. Sujoy K. Guha. RISUG has been patented in India, China, Bangladesh, and the United States. Phase III clinical trials were underway in India, and were slowed by insufficient volunteers. , a contraceptive product based on RISUG, Vasalgel, was under development in the US by Parsemus Foundation, but funding was uncertain. , RSUG and Vasalgel were still in development and testing.
Reversible inhibition of sperm under guidance
Spermatogenesis arrest
Immature ovum
Onselling of sperm
Products of conception
Assisted zona hatching
Fallopian tube obstruction
Ovulatory shift hypothesis