Abstract: A cryo-fixation lead extraction device includes a lead extraction catheter having longitudinally spaced proximal and distal catheter ends and an elongate catheter lumen. A liner has longitudinally spaced proximal and distal liner ends and an elongate liner lumen. The liner lumen is configured to selectively accept at least part of a lead being extracted longitudinally therethrough. At least a portion of the liner is located circumferentially within and/or circumferentially surrounding the catheter lumen. At least one cryogen supply line extends longitudinally through at least a portion of the liner lumen. The cryogen supply line is configured to place a cryogen fluid source into fluid communication with the distal liner end. The cryogen supply line is configured to selectively generate a patient tissue cooled zone adjacent the distal catheter end. A method of cryo-fixation lead extraction is also provided.

Abstract: Spectral parameters of ultrasound backscatter of myocardial tissue can be utilized to identify fibrosis and accurately assess myocardial viability during ablation procedures to treat atrial fibrillation. For example, a portion of myocardial tissue may be ultrasonically insonified, the backscatter signal of ultrasonic waves backscattered from the portion of myocardial tissue may be measured, a spectral parameter of the backscatter signal may be determined, the spectral parameter may be correlated with an electrical conductivity of the portion of myocardial tissue; and a treatment of the patient may be determined or adjusted based on the correlation.

Abstract: A cryo-fixation lead extraction device includes a lead extraction catheter having longitudinally spaced proximal and distal catheter ends and an elongate catheter lumen. A liner has longitudinally spaced proximal and distal liner ends and an elongate liner lumen. The liner lumen is configured to selectively accept at least part of a lead being extracted longitudinally therethrough. At least a portion of the liner is located circumferentially within and/or circumferentially surrounding the catheter lumen. At least one cryogen supply line extends longitudinally through at least a portion of the liner lumen. The cryogen supply line is configured to place a cryogen fluid source into fluid communication with the distal liner end. The cryogen supply line is configured to selectively generate a patient tissue cooled zone adjacent the distal catheter end. A method of cryo-fixation lead extraction is also provided.