▁cord ▁tra uma ▁to ▁present ▁an ▁environment ▁that ▁prom otes ▁growth ▁of ▁ax ons ▁( port ions ▁of ▁the ▁cell ▁attributed ▁with ▁transmission ▁of ▁elect rical ▁signals ) ▁so ▁that ▁patients ▁unable ▁to ▁move ▁or ▁feel ▁might ▁be ▁able ▁to ▁do ▁so ▁again . ▁The ▁potential s ▁are ▁wide - r anging , ▁but ▁it ▁is ▁important ▁to ▁note ▁that ▁many ▁of ▁these ▁ther ap ies ▁are ▁still ▁in ▁the ▁labor atory ▁phase ▁and ▁are ▁slowly ▁being ▁adapted ▁in ▁the ▁clin ic . ▁Some ▁scient ists ▁remain ▁ske pt ical ▁with ▁the ▁development ▁of ▁the ▁field , ▁and ▁warn ▁that ▁there ▁is ▁a ▁much ▁larger ▁chance ▁that ▁elect rical ▁prost h esis ▁will ▁be ▁developed ▁to ▁solve ▁clin ical ▁problems ▁such ▁as ▁hearing ▁loss ▁or ▁par al ysis ▁before ▁cell ▁ther apy ▁is ▁used ▁in ▁a ▁clin ic . ▁ ▁Nov el ▁drug ▁delivery ▁systems ▁are ▁being ▁research ed ▁in ▁order ▁to ▁improve ▁the ▁lives ▁of ▁those ▁who ▁struggle ▁with ▁brain ▁dis orders ▁that ▁might ▁not ▁be ▁treated ▁with ▁stem ▁cells , ▁mod ulation , ▁or ▁re h abil itation . ▁Ph arma ce ut ical s ▁play ▁a ▁very ▁important ▁role ▁in ▁society , ▁and ▁the ▁brain ▁has ▁a ▁very ▁select ive ▁bar rier ▁that ▁prevents ▁some ▁dru gs ▁from ▁going ▁from ▁the ▁blood ▁to ▁the ▁brain . ▁There ▁are ▁some ▁dise ases ▁of ▁the ▁brain ▁such ▁as ▁men ing itis ▁that ▁require ▁do ctors ▁to ▁directly ▁inject ▁medicine ▁into ▁the ▁sp inal ▁cord ▁because ▁the ▁drug ▁cannot ▁cross ▁the ▁blood –