A delivery system for delivering an implantable fixation device to a plurality of leaflets of a heart valve, the delivery system including: the implantable fixation device having: a first arm and a second arm , a first gripping element moveable relative to the first arm between a first position and a second position, and a second gripping element moveable relative to the second arm between a first position and a second position; wherein the first arm and the second arm are positionable on opposite sides of the leaflets to the first gripping element and the second gripping element respectively; a delivery device having: a catheter having a proximal end portion and a distal end portion , the catheter defining at least one lumen extending from the proximal end portion to the distal end portion ; an actuator rod passing through the catheter lumen; and a flexible cable , joined to the distal end of the actuator rod ; characterised in that : the flexible cable is arranged to be disposed within the lumen, the flexible cable having a plurality of layers of wires; the flexible cable is resiliently biased to return to a substantially linear configuration after being deflected 90° or more; the flexible cable comprises an inner most layer of wires and an outermost layer of wires; and the flexible cable is connectable with the fixation device and is operable to control opening and closing of the first arm and the second arm . a first arm and a second arm , a first gripping element moveable relative to the first arm between a first position and a second position, and a second gripping element moveable relative to the second arm between a first position and a second position; a delivery device having: a catheter having a proximal end portion and a distal end portion , the catheter defining at least one lumen extending from the proximal end portion to the distal end portion ; an actuator rod passing through the catheter lumen; and a flexible cable , joined to the distal end of the actuator rod ; a catheter having a proximal end portion and a distal end portion , the catheter defining at least one lumen extending from the proximal end portion to the distal end portion ; an actuator rod passing through the catheter lumen; and a flexible cable , joined to the distal end of the actuator rod ; characterised in that : the flexible cable is arranged to be disposed within the lumen, the flexible cable having a plurality of layers of wires; the flexible cable is resiliently biased to return to a substantially linear configuration after being deflected 90° or more; the flexible cable comprises an inner most layer of wires and an outermost layer of wires; and the flexible cable is connectable with the fixation device and is operable to control opening and closing of the first arm and the second arm . the flexible cable is arranged to be disposed within the lumen, the flexible cable having a plurality of layers of wires; the flexible cable is resiliently biased to return to a substantially linear configuration after being deflected 90° or more; the flexible cable comprises an inner most layer of wires and an outermost layer of wires; and the flexible cable is connectable with the fixation device and is operable to control opening and closing of the first arm and the second arm . <EOS>