A delivery handle arrangement and system that facilitates the delivery of an expandable medical device to a treatment site, and wherein the delivery handle arrangement includes a housing having an inner core that extends linearly between a proximal end and a distal end of the housing, and wherein the inner core receives a flexible catheter and a balloon catheter that is disposed coaxially within the flexible catheter; an longitudinal adjustment mechanism that is configured to control a position of the balloon catheter relative to the flexible catheter, and wherein the longitudinal adjustment mechanism includes a control knob and a switch that is configured to lock or unlocked the longitudinal adjustment mechanism.