A medical system is disclosed for replacement and/or repair of a native heart valve, comprising an artificial valve, a catheter, a device for collecting and arranging chordae and/or leaflets to hold and/or stabilize an artificial valve in a desired position, the device comprising a clip (902) being deployable from the catheter to surround the artificial valve and to lock the chordae in position towards the artificial valve, and wherein the clip is shaped as a helix.
