Accessory to allow sensing at balloon interface

An accessory for a balloon catheter, the accessory comprising:

• a first annular element including a central opening, a distal edge, and a proximal edge;
• a plurality of wires coupled to the first annular element, each of the plurality of wires passing over the distal edge of the first annular element and through the central opening of the first annular element;
• and
• a second annular element including a central opening, a distal face, and a proximal face, the plurality of wires passing from the central opening of the first annular element through the central opening of the second annular element.

An accessory for a balloon catheter, the accessory comprising:

• a first annular element including a central opening, a distal edge, and a proximal edge;
• a plurality of wires radially arranged around and coupled to the first annular element, each of the plurality of wires passing over the distal edge of the first annular element and through the central opening of the first annular element, at least one of the plurality of wires including a sensing element;
• a second annular element including a central opening, a distal face, and a proximal face, the plurality of wires passing from the central opening of the first annular element through the central opening of the second annular element;
• and
• an elongate sheath including a distal portion, a proximal portion, and a lumen extending between the distal portion and the proximal portion, the first annular element being coupled to the distal portion of the sheath, the lumen of the sheath being sized to enclose the balloon catheter, second annular element, and plurality of wires when the balloon catheter is in a delivery configuration.