Sonicating sperm may be next male contraceptive

Washington, Jan 31 (ANI): Exposing the testicles to high frequency ultrasound could effectively stop sperm production, researchers say.

New research used commercially available therapeutic ultrasound equipment to reduce sperm counts of male rats to levels, which would result in infertility in humans.

Ultrasound's potential as a male contraceptive was first reported nearly 40 years ago. However the equipment used is now outdated and no longer available.

Researchers from the Department of Pediatrics at the University of North Carolina School of Medicine used these experiments as a starting point to see if modern ultrasound equipment usually used for physical therapy could be used as a male contraceptive.

The team led by James Tsuruta found that by rotating high frequency (3MHz) ultrasound around the testes they were able to cause uniform depletion of germ cells throughout the testes.

The best results were seen using two sessions consisting of 15 minutes ultrasound, two days apart. Saline was used to provide conduction between the ultrasound transducer and skin, and the testes were warmed to 37 degrees centigrade.

Together this reduced sperm to a Sperm Count Index of zero (3 million motile sperm per cauda epididymis).

The World Health Organization has defined oligospermia (low sperm concentration) as less than 15 million sperm per ml.

"Unlike humans, rats remain fertile even with extremely low sperm counts. However, our non-invasive ultrasound treatment reduced sperm reserves in rats far below levels normally seen in fertile men (95 percent of fertile men have more than 39 million sperm in their ejaculate)," Dr Tsuruta explained.

"However further studies are required to determine how long the contraceptive effect lasts and if it is safe to use multiple times," Dr Tsuruta added.

The study has been published in BioMed Central's open access journal Reproductive Biology and Endocrinology. (ANI)

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