9 3 ▁until ▁his ▁ret irement ▁in ▁ 1 9 2 3 ▁was ▁a ▁professor ▁at ▁the ▁University ▁of ▁Bres lau . ▁ ▁Kü st ner ▁special ized ▁in ▁oper ative ▁gy ne col ogy ▁and ▁situations ▁involving ▁difficult ▁child b irth . ▁There ▁are ▁a ▁number ▁of ▁medical ▁e pon ym s ▁associated ▁with ▁him , ▁including ▁an ▁obst et rical ▁extra ction ▁hook ▁known ▁as ▁" K üst ner ' s ▁Ste iß h aken ". ▁He ▁was ▁the ▁author ▁of ▁a ▁successful ▁text book ▁on ▁gy ne col ogy , ▁titled ▁" K ur zes ▁Lehr buch ▁der ▁G yn ä k ologie " ▁( 1 9 0 1 , ▁ 9 th ▁edition ▁ 1 9 2 2 ). ▁ ▁Selected ▁written ▁works ▁▁ ▁Der ▁ab dom inale ▁Kais ers chn itt ▁( The ▁ab dom inal ▁Ca es are an ▁section ), ▁Wies b aden ▁( 1 9 1 5 ). ▁ ▁Kur zes ▁Lehr buch ▁der ▁G yn ä k ologie ▁( Short ▁text book ▁of ▁gy ne col ogy ), ▁J ena ▁( 9 th ▁edition ▁ 1 9 2 2 ). ▁▁ ▁Path ologie ▁der ▁Schw ang ersch aft ▁( Path ology ▁of ▁pre gn ancy ), ▁in : ▁K . ▁B ais el ' s ▁Text book ▁of ▁Ob st et rics , ▁Volume ▁ 2 , ▁( 1 9 2 4 ). ▁ ▁References ▁▁ ▁Part s ▁of ▁this ▁article ▁are ▁based ▁on ▁a ▁translation ▁of ▁the ▁equivalent ▁article ▁at ▁the ▁German ▁Wikipedia