因发明了一种利用较低强度电场通过子宫颈杀死精子的新节育装置,美国纽约多布斯·费里的妇女医院主任Steven Kaali获得了专利权。他的这种节育装置已经实验室和动物试验验证,有效率为百分之百。新节育法所使用的低电场是由一个仅2mm厚和7mm长的电池所产生的。把电池放置在子宫颈象宫内避孕装 Steven Kaali, director of the Women’s Hospital in Dobhers-Fry, New York, was patented for inventing a new device that uses sperm to kill sperm through the cervix with less intense electric fields. His birth control device has been laboratory and animal experiments to verify, the efficiency is 100%. The low electric field used for the new birth control method is generated by a battery that is only 2mm thick and 7mm long. Put the battery in the cervix like intrauterine contraceptives