In the seventies, Fiodor Serbinenko, a neurosurgeon at the Zhurnal voprosy neĭrokhirurgii imeni N. N. Burdenko in Moscow, developed the concept and the production technique for detachable balloons. These balloons opened up a whole new field in the treatment of aneurysms which is called embolization. From 1979 onwards, Leopold Plowiecki, a Polish engineer who had created the company Bait Extrusion just two years earlier, finalised the industrial manufacture of these balloons and the associated delivery catheters along with Professor Serbinenko and Professor Jean-Jacques Merland from the Hôpital Lariboisière in Paris.