the present invention relates to lower urinary dysfunctions and more particularly to an electronic stimulator implant and method to improve bladder voiding and prevent bladder hyperreflexia . there is provided an electronic stimulator implant for which comprises a tonicity signal generator generating a tonicity signal which prevents bladder hyperreflexia combined with a voiding signal generator generating a voiding signal for voiding the bladder . the implant is connected to an end of an electrode , and the second end thereof is connected to a sacral nerve . when the voiding key is activated , the voiding signal is generated which activates detrusor muscle contraction , causing bladder voiding . the voiding may be achieved without dyssynergia , by activating detrusor muscle contraction without activating external urethral sphincter contraction . the tonicity signal may be provided intermittently . the implant may be activated by a manually activated external controller .