A medical device handle for percutaneous delivery of a medical implant from a tubular member extending distally from the medical device handle, comprising: a handle housing having a longitudinal axis extending from a proximal end of the handle housing to a distal end of the handle housing, the handle housing including a cavity disposed within the handle housing; a carriage assembly disposed within the cavity and operatively connected to the tubular member and the medical implant , the carriage assembly being longitudinally movable between a distal position and a proximal position by rotation of a control knob with respect to the handle housing , the control knob being disposed around the proximal end of the handle housing; wherein the carriage assembly includes a carriage member , a first sliding member , a second sliding member , and a locking element configured to releasably fix the first sliding member and the second sliding member relative to the carriage member , the locking element being rotatable relative to the handle housing ; and a tubular collar member disposed around a proximal portion of the handle housing , the tubular collar member being rotatable about the handle housing; characterized in that the handle housing includes a button mechanism configured to engage the tubular collar member in a first orientation of the tubular collar member relative to the handle housing when the first sliding member and the second sliding member are fixed to the carriage member by the locking element , and the button mechanism is configured to engage the tubular collar member in a second orientation of the tubular collar member relative to the handle housing when the first sliding member and the second sliding member are not fixed to the carriage member by the locking element . a handle housing having a longitudinal axis extending from a proximal end of the handle housing to a distal end of the handle housing, the handle housing including a cavity disposed within the handle housing; a carriage assembly disposed within the cavity and operatively connected to the tubular member and the medical implant , the carriage assembly being longitudinally movable between a distal position and a proximal position by rotation of a control knob with respect to the handle housing , the control knob being disposed around the proximal end of the handle housing; wherein the carriage assembly includes a carriage member , a first sliding member , a second sliding member , and a locking element configured to releasably fix the first sliding member and the second sliding member relative to the carriage member , the locking element being rotatable relative to the handle housing ; and a tubular collar member disposed around a proximal portion of the handle housing , the tubular collar member being rotatable about the handle housing; characterized in that the handle housing includes a button mechanism configured to engage the tubular collar member in a first orientation of the tubular collar member relative to the handle housing when the first sliding member and the second sliding member are fixed to the carriage member by the locking element , and the button mechanism is configured to engage the tubular collar member in a second orientation of the tubular collar member relative to the handle housing when the first sliding member and the second sliding member are not fixed to the carriage member by the locking element . <EOS>