A catheter system comprising: a catheter sheath comprising a proximal end, a distal end, and a lumen extending between the proximal end of the catheter sheath and the distal end of the catheter sheath; a shaft comprising a proximal end, a distal end, and an elongated portion extending between the proximal end of the shaft and the distal end of the shaft, at least part of the shaft sized for delivery through the lumen of the catheter sheath, and the distal end of the shaft arranged to be delivered through the lumen of the catheter sheath prior to at least the elongated portion of the shaft; a manipulable portion physically coupled to the shaft and located at least proximate the distal end of the shaft, the manipulable portion selectively moveable between a delivery configuration in which the manipulable portion is shaped to be delivered through the lumen of the catheter sheath and an expanded configuration in which the manipulable portion is sized too large for delivery through the lumen of the catheter sheath; a control element physically coupled to a distal end portion of the manipulable portion to transmit force to the manipulable portion, the control element receivable in the lumen of the catheter sheath; and an actuator system operatively coupled to at least the control element; characterised in that the actuator system is configured to cause at least: when a particular relative positioning exists between the catheter sheath and the shaft received in the lumen of the catheter sheath during a transition of the manipulable portion toward the expanded configuration, the control element to have a first amount of length located outside of the distal end of the catheter sheath, at least in response to occurrence of a first state associated with a direction of relative movement between the catheter sheath and a portion of the shaft in the lumen of the catheter sheath that triggers the transition of the manipulable portion toward the expanded configuration, and when the particular relative positioning exists between the catheter sheath and the shaft received in the lumen of the catheter sheath during a transition of the manipulable portion toward the delivery configuration, the control element to have a second amount of length located outside of the distal end of the catheter sheath, at least in response to occurrence of a second state associated with a direction of relative movement between the catheter sheath and a portion of the shaft in the lumen of the catheter sheath that triggers the transition of the manipulable portion toward the delivery configuration, wherein the second amount of length is greater than the first amount of length. a catheter sheath comprising a proximal end, a distal end, and a lumen extending between the proximal end of the catheter sheath and the distal end of the catheter sheath; a shaft comprising a proximal end, a distal end, and an elongated portion extending between the proximal end of the shaft and the distal end of the shaft, at least part of the shaft sized for delivery through the lumen of the catheter sheath, and the distal end of the shaft arranged to be delivered through the lumen of the catheter sheath prior to at least the elongated portion of the shaft; a manipulable portion physically coupled to the shaft and located at least proximate the distal end of the shaft, the manipulable portion selectively moveable between a delivery configuration in which the manipulable portion is shaped to be delivered through the lumen of the catheter sheath and an expanded configuration in which the manipulable portion is sized too large for delivery through the lumen of the catheter sheath; a control element physically coupled to a distal end portion of the manipulable portion to transmit force to the manipulable portion, the control element receivable in the lumen of the catheter sheath; and an actuator system operatively coupled to at least the control element; when a particular relative positioning exists between the catheter sheath and the shaft received in the lumen of the catheter sheath during a transition of the manipulable portion toward the expanded configuration, the control element to have a first amount of length located outside of the distal end of the catheter sheath, at least in response to occurrence of a first state associated with a direction of relative movement between the catheter sheath and a portion of the shaft in the lumen of the catheter sheath that triggers the transition of the manipulable portion toward the expanded configuration, and when the particular relative positioning exists between the catheter sheath and the shaft received in the lumen of the catheter sheath during a transition of the manipulable portion toward the delivery configuration, the control element to have a second amount of length located outside of the distal end of the catheter sheath, at least in response to occurrence of a second state associated with a direction of relative movement between the catheter sheath and a portion of the shaft in the lumen of the catheter sheath that triggers the transition of the manipulable portion toward the delivery configuration, wherein the second amount of length is greater than the first amount of length.