▁by ▁“ low ▁resistance , ▁ease ▁of ▁ster il isation , ▁no ▁re fl ux , ▁robust ▁construction , ▁and ▁neg lig ible ▁risk ▁of ▁block age ”. ▁ ▁By ▁the ▁time ▁the ▁device ▁was ▁perfect ed , ▁The o ▁had ▁he aled ▁to ▁the ▁point ▁at ▁which ▁it ▁was ▁no ▁longer ▁necessary ▁to ▁impl ant ▁the ▁sh unt ▁in ▁his ▁sk ull . ▁However , ▁several ▁thousand ▁other ▁children ▁around ▁the ▁world ▁benef ited ▁from ▁the ▁W DT ▁val ve ▁before ▁medicine ▁technology ▁progress ed ▁beyond ▁it . ▁The ▁co - in vent ors ▁agreed ▁never ▁to ▁accept ▁any ▁profit ▁from ▁the ▁in vention . ▁ ▁References ▁ ▁External ▁links ▁▁ ▁Category : Impl ants ▁( med ic ine ) <0x0A> </s> ▁Steve ▁At k iss ▁is ▁a ▁former ▁US ▁Government ▁official ▁who ▁is ▁a ▁Princi pal ▁at ▁Command ▁Cons ult ing ▁Group , ▁a ▁hom eland ▁and ▁national ▁security ▁advis ory ▁firm ▁based ▁in ▁Washington , ▁DC , ▁USA . ▁ ▁At k iss ▁served ▁in ▁U . S . ▁Custom s ▁and ▁Border ▁Prote ction , ▁the ▁largest ▁law ▁enfor cement ▁ag ency ▁in ▁the ▁United ▁States ▁as ▁Chief ▁of ▁Staff . ▁ ▁He ▁is ▁most ▁well ▁known ▁for ▁his ▁invol vement ▁in ▁the ▁effort ▁to ▁build ▁C B P ' s ▁intelligence ▁capabilities . ▁ ▁At k iss ▁also ▁served ▁at ▁the ▁White ▁House ▁as ▁Special ▁Ass istant ▁to ▁the ▁President ▁for ▁Oper ations ▁in ▁the ▁Chief ▁of ▁Staff ’ s ▁Office . ▁ ▁His ▁office ▁in ▁the ▁West