Common bond, double-balloon catheter

1. A method of manufacturing a catheter, the method comprising:

assembling an inner balloon within a separate outer balloon, the inner and outer balloons each being open on opposing longitudinal ends, having a central radially expandable portion, and proximal and distal reduced diameter portions on each opposing longitudinal end;

placing an elongate lumen structure between an inner surface of the outer balloon proximal reduced diameter portion and an outer surface of the inner balloon proximal portion;

bonding a portion of the inner surface of the outer balloon proximal reduced diameter portion, a portion of the outer surface of the inner balloon proximal reduced diameter portion, and an outer surface of the elongate lumen structure to fix the elongate lumen structure between the outer balloon proximal reduced diameter portion and the inner balloon proximal reduced diameter portion; and

bonding a distal end portion of an elongate catheter shaft to a proximal portion of the bonded inner and outer balloons such that the elongate lumen structure extends from distal of proximal ends of the inner and outer balloons to proximal of the inner and outer balloons and into a lumen of the elongate catheter shaft;

wherein the bonding of the portion of the inner surface of the outer balloon proximal reduced diameter portion and the portion of the outer surface of the inner balloon proximal reduced diameter portion is performed with the elongate lumen structure between the portion of the inner surface of the outer balloon proximal reduced diameter portion and the portion of the outer surface of the inner balloon proximal reduced diameter portion such that the inner surface of the outer balloon proximal reduced diameter portion, the outer surface of the inner balloon proximal reduced diameter portion, and the outer surface of the elongate lumen structure are bonded to one another;

wherein after completion of the method of manufacturing the catheter, a line extending perpendicular to and passing through a central longitudinal axis of the catheter passes through, in order, a first side of a wall of the proximal reduced diameter portion of the outer balloon, a first side of a wall of the proximal reduced diameter portion of the inner balloon, a second side of the wall of the proximal reduced diameter portion of the inner balloon, a first side of a wall of the elongate lumen structure, a second side of the wall of the elongate lumen structure, and a second side of the wall of the proximal reduced diameter portion of the outer balloon.

2. The method of claim 1 , wherein the catheter is a catheter for providing cryotherapy.

3. The method of claim 1 , wherein the bonding of the distal end portion of the elongate catheter shaft to the proximal portion of the bonded inner and outer balloons comprises bonding the inner surface of the outer balloon proximal reduced diameter portion to a portion of an outer surface of the distal end portion of the elongate catheter shaft.

4. The method of claim 1 , wherein the elongate catheter shaft comprises a tubular structure.

5. The method of claim 1 , further comprising introducing an assembly comprising an elongate guidewire lumen structure and a cryotherapy fluid delivery apparatus into an inner chamber of the elongate catheter shaft and inner balloon, and bonding the assembly to at least one of the elongate catheter shaft, the inner balloon, or the outer balloon.

6. The method of claim 1 , wherein the bonding of the portion of the inner surface of the outer balloon proximal reduced diameter portion and the portion of the outer surface of the inner balloon proximal reduced diameter portion is performed with a rigid elongate cylindrical structure positioned to extend through a passageway within the inner balloon proximal reduced portion so that the passageway does not collapse during the bonding.

7. The method of claim 6 , wherein the rigid elongate cylindrical structure is a mandrel.

8. The method of claim 6 , wherein the bonding of the portion of the inner surface of the outer balloon proximal reduced diameter portion and the portion of the outer surface of the inner balloon proximal reduced diameter portion comprises exerting pressure on an outer surface of the outer balloon proximal reduced diameter portion.

9. The method of claim 1 , wherein the elongate lumen structure has a distal end with an opening therein and wherein the step of bonding of the portion of the inner surface of the outer balloon proximal reduced diameter portion and the portion of the outer surface of the inner balloon proximal reduced diameter portion is performed when the distal end of the elongate lumen structure is in the central radially expandable portion of the outer balloon.

10. The method of claim 1 , wherein the elongate lumen structure has a length less than a length of the catheter shaft.

11. A method of manufacturing a catheter, the method comprising:

assembling an inner balloon within a separate outer balloon, the inner and outer balloons each being open on opposing longitudinal ends, having a central radially expandable portion, and proximal and distal reduced diameter portions on each opposing longitudinal end;

placing an elongate lumen structure between an inner surface of the outer balloon proximal reduced diameter portion and an outer surface of the inner balloon proximal portion;

bonding a portion of the inner surface of the outer balloon proximal reduced diameter portion to a portion of the outer surface of the inner balloon proximal reduced diameter portion with the elongate lumen structure between the portion of the inner surface of the outer balloon proximal reduced diameter portion and the portion of the outer surface of the inner balloon proximal reduced diameter portion such that the inner surface of the outer balloon proximal reduced diameter portion, the outer surface of the inner balloon proximal reduced diameter portion, and an outer surface of the elongate lumen structure are bonded to one another, thereby fixing the elongate lumen structure between the outer balloon proximal reduced diameter portion and the inner balloon proximal reduced diameter portion;

bonding a distal end portion of an elongate catheter shaft to a proximal portion of the bonded inner and outer balloons such that the elongate lumen structure extends from distal of proximal ends of the inner and outer balloons to proximal of the inner and outer balloons and into a lumen of the elongate catheter shaft.

12. The method of claim 11 , wherein the elongate lumen structure has a length less than a length of the catheter shaft.