▁ins ul in ▁and ▁gl uc agon ▁in ▁response ▁to ▁sens ed ▁blood ▁gl uc ose ▁levels . ▁While ▁not ▁yet ▁approved ▁for ▁public ▁use , ▁the ▁ 4 th ▁generation ▁i Let ▁prototype , ▁presented ▁in ▁ 2 0 1 7 , ▁is ▁around ▁the ▁size ▁of ▁an ▁iPhone , ▁with ▁a ▁touch screen ▁interface . ▁It ▁contains ▁two ▁ch amb ers ▁for ▁both ▁ins ul in ▁and ▁gl uc agon , ▁and ▁the ▁device ▁is ▁configur able ▁for ▁use ▁with ▁only ▁one ▁h orm one , ▁or ▁both . ▁While ▁tri als ▁continue ▁to ▁be ▁run , ▁the ▁i Let ▁has ▁a ▁project ed ▁final ▁appro val ▁for ▁the ▁ins ul in - only ▁system ▁in ▁ 2 0 2 0 . ▁ ▁Current ▁studies ▁Four ▁studies ▁on ▁different ▁artificial ▁pan cre as ▁systems ▁are ▁being ▁conducted ▁starting ▁in ▁ 2 0 1 7 ▁and ▁going ▁into ▁the ▁near ▁future . ▁The ▁projects ▁are ▁fund ed ▁by ▁the ▁National ▁Institute ▁of ▁Di ab etes ▁and ▁Dig est ive ▁and ▁Kid ney ▁D ise ases ( N ID DK ), ▁and ▁are ▁the ▁final ▁part ▁of ▁testing ▁the ▁devices ▁before ▁applying ▁for ▁appro val ▁for ▁use . ▁Part icip ants ▁in ▁the ▁studies ▁are ▁able ▁to ▁live ▁their ▁lives ▁at ▁home ▁while ▁using ▁the ▁devices ▁and ▁being ▁monitor ed ▁rem ot ely ▁for ▁safety , ▁effic acy , ▁and ▁a ▁number ▁of ▁other ▁factors . ▁ ▁The ▁International ▁Di ab etes ▁Cl osed - Loop ▁trial , ▁led ▁by ▁research ers ▁from