Clemens Bimek is a German inventor of a device to control the sperm flow through a flipping switch.
The device is implanted through surgery and attached to the vas deferens. The device is equipped with a valve which is closed and opened as desired through the skin on the scrotum.
If the valve is in the off position sperm cells are prevented from reaching the seminal fluid. This allows ejaculation no sperm is present in the seminal fluid.
The procedure basically works as a vasectomy. But in comparison with a vasectomy which is only reversible through microscopic surgery the new device makes it reversible with a flip of the switch.
I believe that clinical trials in humans are underway. Until now the only men who tested the device is the inventor.
At the present the inventor is satisfied with his device so he plans to implant it to 25 men during a clinical trial this year and if everything goes well the device will hopefully get on the market by 2018.
As new information becomes available on this device, I will post a blog on what I find out.