Implant system including guiding accessory and methods of use

A therapy delivery device and a guiding accessory for use in conjunction with a guidewire, and a catheter to facilitate passage of a portion of the therapy delivery device to an implant site;

• the device including a therapy generator, a therapy delivery element, and an elongate and flexible isolated conductor coupling the therapy generator to the therapy delivery element;
• the catheter including a distal portion sized to hold
• the therapy generator of the device, the distal portion having an opening through which the elongate and flexible isolated conductor of the device extends outside of, and generally distal of, the distal portion, when the distal portion holds the therapy generator;
• and the guiding accessory comprising:
• a helically extending wall forming a lumen that extends along a length from a proximal opening thereof to a distal opening thereof, the lumen having a diameter sized to accommodate therein the guidewire and the elongate and flexible isolated conductor of the device, side-by-side, such that the guidewire is slidable within the lumen alongside the isolated conductor, and such that the wall and the conductor together are moveable along the guidewire;
• and
• a tension line attached to a proximal end of the helically extending wall, the tension line having a length that is greater than a length of the implant catheter;
• and
• wherein adjacent turns of the helically extending wall are separable from one another so that, upon application of a pull force to the tension line, in a proximal direction, when the conductor of the device extends within the lumen, the wall unwinds from around the conductor.