Balloon catheter with deformable fluid delivery conduit

1. A medical device, comprising:

an elongate body having a proximal portion and a distal portion;

a shaft at least partially disposed within the elongate body;

an expandable element at the distal portion of the elongate body; and

a fluid delivery conduit defining a deflectable segment movably coupled to the shaft, the deflectable segment defining a proximal end, a distal end, an outer circumference, and at least one opening helically arranged around the outer circumference of the deflectable segment, each of the distal end and the proximal end of the deflectable segment being slidably and rotatably coupled to the shaft,

the deflectable segment being configured to deliver a cryogenic coolant at a first flow rate when the proximal end and the distal end of the deflectable segment are moved toward each other along the shaft, and the deflectable segment being configured to deliver the cryogenic coolant at a second flow rate when the proximal end and the distal end of the deflectable segment are moved away from each other along the shaft, the second flow rate being greater than the first flow rate.

2. The medical device of claim 1 , further comprising a cryogenic coolant source in fluid communication with the fluid delivery conduit.

3. The medical device according to claim 1 , wherein the shaft is movable with respect to the elongate body.

4. The medical device according to claim 1 , wherein the shaft defines a lumen therein for passage of a guide wire.

5. The medical device according to claim 1 , wherein the elongate body defines an exhaust lumen in fluid communication with an interior of the expandable element.

6. The medical device according to claim 1 , further comprising a first actuator coupled to the deflectable segment to adjust a longitudinal position of at least a portion of the deflectable segment.

7. The medical device according to claim 6 , further comprising a second actuator coupled to the deflectable segment to adjust a rotational position of at least a portion of the deflectable segment.

8. The medical device according to claim 1 , wherein the deflectable segment defines a length between the proximal end and the distal end, the at least one opening being helically arranged around the outer circumference of the length.

9. The medical device according to claim 8 , wherein the expandable element includes an inner surface and an outer surface, at least a portion of the length being proximate the expandable element inner surface when the deflectable segment is in the curvilinear configuration.

10. The medical device of claim 1 , wherein the at least one opening defines a first opening width when the proximal end and the distal end of the deflectable segment are a first distance apart and a second opening width when the proximal end and the distal end of the deflectable segment are a second distance apart, the second opening width being greater than the first opening width when the second distance is greater than the first distance.

11. The medical device according to claim 1 , wherein the deflectable segment is transitionable from a linear configuration to a curvilinear configuration.

12. The medical device according to claim 1 , wherein the deflectable segment is transitionable from a first configuration to a second configuration, each of the proximal end and the distal end being coupled to the shaft in each of the first configuration and the second configuration with at least a portion of the length of the deflectable segment being proximate the expandable element inner surface in the second configuration.

13. The medical device of claim 12 , wherein the first configuration is a linear configuration.

14. The medical device of claim 13 , wherein the second configuration is a helical configuration.