Large area cryoablation catheter with multi-geometry tip ECG/CRYO mapping capabilities
A medical device including an ablation element. A thermally insulative sheath is included disposed within the ablation element. A fluid injection tube is disposed within a portion of the thermally insulative sheath. The ablation element passively transitions from a substantially linear geometric configuration to a substantially circular geometric configuration as the sheath is retracted proximally from a first position in which the sheath substantially encloses the fluid injection tube to a second position in which a portion of the fluid injection tube extends a distance away from the sheath.
1. A medical device, comprising:
an ablation element;
a thermally insulative sheath disposed within the ablation element;
a fluid injection tube disposed within a portion of the thermally insulative sheath; and
the ablation element passively transitioning from a substantially linear geometric configuration to a substantially circular geometric configuration as the sheath is retracted proximally from a first position in which the sheath substantially encloses the fluid injection tube to a second position in which a portion of the fluid injection tube extends a distance away from the sheath, at least a portion of the fluid injection tube being biased in the substantially circular geometric configuration.
2. The medical device of claim 1 , wherein the ablation element is a cryogenic ablation element.
3. The medical device of claim 1 , wherein fluid injection tube is composed of a shape memory material.
4. The medical device of claim 3 , wherein the fluid injection tube defines a plurality of fluid injection ports.
5. The medical device of claim 1 , wherein the ablation element includes a bellows portion.
6. The medical device of claim 1 , further including a distal tip coupled to the ablation element, and wherein the distal tip includes plurality of electrodes.
7. The medical device of claim 1 , wherein the ablation element defines a coil.
8. The medical device of claim 1 , wherein the thermally insulative sheath is stiffer than the fluid injection tube.
9. The medical device of claim 1 , further comprising a handle, and wherein the ablation element and the sheath are coupled to the handle.
10. The medical device of claim 9 , further comprising an actuator coupled to the handle, and wherein the actuator operates to advance and retract the sheath.
11. A medical device, comprising:
a cryogenic ablation element;
a thermally insulative sheath disposed within the cryogenic ablation element;
a fluid injection tube disposed within a portion of the thermally insulative sheath and in fluid communication with a cryogenic fluid source, the fluid injection tube defining a plurality of fluid injection ports;
the sheath sealing at least one of fluid injection ports when advanced toward a distal portion of the cryogenic ablation element; and
the cryogenic ablation element passively transitioning from a substantially linear geometric configuration to a substantially circular geometric configuration as the sheath is retracted proximally from a first position in which the sheath substantially encloses the fluid injection tube to a second position in which a portion of the fluid injection tube extends a distance away from the sheath, at least a portion of the fluid injection tube is biased in the substantially circular geometric configuration.
12. The medical device of claim 11 , further including a distal tip coupled to the cryogenic ablation element, and wherein the distal tip includes plurality of electrodes.
13. The medical device of claim 11 , wherein the cryogenic ablation element includes a bellows portion.
14. The medical device of claim 11 , further comprising a handle, and wherein the cryogenic ablation element and the sheath are coupled to the handle.
15. The medical device of claim 14 , further comprising an actuator coupled to the handle, and wherein the actuator operates to advance and retract the sheath.
16. The medical device of claim 11 , wherein fluid injection tube is more flexible than the sheath.
17. The medical device of claim 11 , wherein the cryogenic ablation element is passively transitionable from a substantially linear geometric configuration to a substantially curvilinear geometric configuration when the sheath is retracted.
18. A medical device, comprising:
a cryogenic ablation element including a bellows portion;
a thermally insulative sheath movably disposed within the cryogenic ablation element;
a fluid injection tube disposed within a portion of the thermally insulative sheath and in fluid communication with a cryogenic fluid source, the fluid injection tube defining a plurality of fluid injection ports, and at least a portion of the fluid injection tube being biased in a substantially circular configuration;
the sheath sealing at least one of fluid injection ports when advanced toward a distal portion of the cryogenic ablation element;
the sheath being stiffer than the fluid injection tube; and
the cryogenic ablation element passively transitioning from a substantially linear geometric configuration to a substantially curvilinear geometric configuration, and passively transitioning from the substantially curvilinear geometric configuration to a substantially circular geometric configuration as the sheath is retracted proximally from a first position in which the sheath substantially encloses the fluid injection tube to a second position in which a portion of the fluid injection tube extends a distance away from the sheath.