Heart valve docking devices and systems

A docking device for docking a prosthetic valve at a native valve of a heart, comprising:

• a coil extending along a central axis, including a leading turn, a central region, and a stabilization turn, wherein:
• the central region possesses at least one central turn defining a central turn diameter;
• the leading turn extends from a distal end of the central region and has a diameter greater than the central turn diameter;
• and
• the stabilization turn extends from a proximal end of the central region and has a diameter greater than the central turn diameter;
• and
• a cap attached to a proximal end portion of the coil, the cap including an opening formed therein, the opening configured to receive a retrieval member of a delivery catheter.

A system for implanting a docking device at a native valve, the system comprising:

• a delivery catheter;
• an elongate coiled docking device having a first end portion and a second end portion opposite the first end portion, the docking device comprising:
• a central region comprising at least one central turn;
• a stabilization turn extending from a proximal end of the central region;
• a leading turn extending from a distal end of the central region;
• and
• a proximal connection end disposed at a proximal end portion of the stabilization turn, the proximal connection end having an opening formed therein;
• a pusher device having a central lumen, wherein the pusher device is disposed in the delivery catheter;
• and
• a retrieval line that extends through the central lumen of the pusher device and is coupled to the proximal connection end via the opening of the proximal connection end,
• wherein the system is configured such that a tension force on the retrieval line pulls the proximal connection end of the coiled docking device against the pusher device, and
• wherein the proximal connection end and the retrieval line are coupled together such that the tension force on the retrieval line substantially aligns with a central axis of the proximal connection end of the coiled docking device.