Cryoablation catheter handle

1. A catheter system comprising:

a flexible catheter having a proximal end, a distal end, a first fluid flow path, and a second fluid flow path;

a first coupling body having a first electrical connector and defining a first passage and a second passage;

a second coupling body having a second electrical connector and defining a third passage and a fourth passage, the coupling bodies being releasably coupled to each other in a coupled configuration;

such that in the coupled configuration, the electrical connectors are in electrical contact, the first passage and the third passage are in fluid communication with each other and with the first fluid flow path, and the second passage and the fourth passage are in fluid communication with each other and with the second fluid flow path;

a pressure sensor in fluid communication with one of the first and second fluid flow paths;

a source of fluid refrigerant in fluid communication with the first fluid flow path; and

a shutoff element coupled to the pressure sensor and terminating fluid flow through the first fluid flow path upon leak detection.

2. The catheter system of claim 1 , wherein the source of fluid refrigerant is pressurized, and the second fluid path is in communication with a vacuum source.

3. The catheter system of claim 1 , further comprising a blood sensor in communication with one of the first and second fluid flow paths.

4. The catheter system of claim 3 , the blood sensor positioned between the coupling bodies and the distal end.

5. The catheter system of claim 1 , further comprising a steering element at least partially disposed within the flexible catheter.

6. The catheter system of claim 5 , further comprising a steering actuator coupled to the steering element.

7. The catheter system of claim 1 , further comprising a handle coupled to the flexible catheter.

8. The catheter system of claim 1 , the pressure sensor positioned between the coupling bodies and the distal end.

9. A catheter system comprising:

a flexible catheter having a proximal end, a distal end, a high-pressure fluid flow path, and a low-pressure fluid flow path;

a first coupling body having a first electrical connector and defining a first passage and a second passage;

a second coupling body having a second electrical connector and defining a third passage and a fourth passage, the coupling bodies being releasably coupled to each other in a coupled configuration;

such that in the coupled configuration, the electrical connectors are in electrical contact, the first passage and the third passage are in fluid communication with each other and with the high-pressure fluid flow path, and the second passage and the fourth passage are in fluid communication with each other and with the low-pressure fluid flow path;

a pressure sensor in fluid communication with the low-pressure fluid flow path; and

a console including a source of fluid refrigerant, wherein the console is in communication with the pressure sensor, and wherein the source of fluid refrigerant is in fluid communication with the high-pressure fluid flow path;

the console being coupled to the pressure sensor and terminating fluid flow in response to the pressure sensor indicating a fluid leak in the low-pressure fluid flow path.

10. The catheter system of claim 9 , wherein the source of fluid refrigerant is pressurized, and the second fluid path is in communication with a vacuum source.

11. The catheter system of claim 9 , further comprising a blood sensor in communication with one of the first and second fluid flow paths.

12. The catheter system of claim 9 , further comprising a steering element at least partially disposed within the flexible catheter.

13. The catheter system of claim 12 , further comprising a steering actuator coupled to the steering element.

14. A method of leak detection in a medical device, comprising:

coupling a first passage and a second passage defined by a first coupling body to a third passage and a fourth passage defined by a second coupling body, electrically connecting a first electrical connector of the first coupling body to a second electrical connector of the second coupling body, the coupling placing the first passage and third passage in fluid communication with a first fluid flow path of a flexible catheter, and the coupling placing the second passage and fourth passage in fluid communication with a second fluid flow path of a flexible catheter;

providing fluid refrigerant to the first fluid flow path at a predetermined operating pressure to cause fluid flow through the first fluid flow path;

detecting a change in operating pressure;

correlating the change in pressure to a leak indication; and

terminating fluid flow through the first fluid flow path if a leak is indicated.

15. A method of leak detection in a medical device, comprising:

coupling a first passage and a second passage defined by a first coupling body to a third passage and a fourth passage defined by a second coupling body, electrically connecting a first electrical connector of the first coupling body to a second electrical connector of the second coupling body, the coupling placing the first passage and third passage in fluid communication with a first fluid flow path of a flexible catheter, and the coupling placing the second passage and fourth passage being in fluid communication with a second fluid flow path of a flexible catheter;

providing fluid refrigerant to the first fluid flow path at a predetermined operating pressure to cause fluid flow through the first fluid flow path;

detecting blood in the flexible catheter;

correlating the blood to a leak indication; and

terminating fluid flow through the first fluid flow path if a leak is indicated.