Patent ID: 11890044
Assignee: ST. JUDE MEDICAL, CARDIOLOGY DIVISION, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 5:
6. The ablation catheter system of claim 1, wherein the interstitial space extends between the radially offset inner and outer balloons, the interstitial space is configured and arranged to capture cryogenic fluid that escapes the inner balloon;
the first lumen extends a length of the catheter shaft and through the adaptor into fluid communication with the interstitial space at a first end of the first lumen and a vacuum source at a second end of the first lumen, the first lumen configured and arranged to draw a vacuum within the interstitial space and to draw the captured cryogenic fluid out of the interstitial space,
the second lumen is in fluid communication with a pressure sensor, the second lumen configured and arranged to sense a change in vacuum pressure within the interstitial space associated with a flow of cryogenic fluid through the inner balloon and into the interstitial space; and
the catheter system further includes
a cryogenic fluid tank,
a cryogenic fluid lumen in fluid communication with the cryogenic fluid tank at a first end of the cryogenic fluid lumen, the cryogenic fluid lumen extends through a length of the catheter shaft and into fluid communication with the manifold at a second end of the cryogenic fluid lumen, and
controller circuitry communicatively coupled to the pressure sensor, and configured and arranged to control the flow of cryogenic fluid to the manifold in response to the change in vacuum pressure measured by the pressure sensor.