Ablation catheters and associated systems and methods
First Claim
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1. A catheter assembly, comprising:
- an elongated body having a proximal portion and a distal portion extending along a longitudinal axis, wherein the distal portion of the body is configured for intravascular delivery via over-the-wire or rapid exchange delivery techniques to a body lumen of a human patient;
a pre-shaped spiral structure associated with the distal portion of the elongated body, wherein the spiral structure terminates in a flexible, curved distal tip portion, and wherein the elongated body and the pre-shaped spiral structure comprise a central lumen; and
a plurality of electrodes associated with the spiral structure,wherein the pre-shaped spiral structure is transformable between—
a low-profile configuration wherein a procedural guide wire is positioned in the central lumen of the spiral structure; and
an expanded configuration wherein the procedural guide wire is at least partially retracted from the spiral structure toward the proximal portion of the elongated body,wherein, when the spiral structure is in the expanded configuration, the spiral structure comprises a plurality of revolutions formed about a central loop axis parallel with the longitudinal axis.
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Abstract
An ablation catheter assembly includes an elongate catheter body having a proximal portion, a distal portion and a lumen therethrough. A helical structure associated with the catheter distal portion carries a plurality of independently operable electrodes and is transformable between a low-profile configuration wherein a straightening element is positioned in the lumen and an expanded configuration wherein the straightening element is at least partially retracted from the spiral structure. When the helical structure is in the expanded configuration, a laterally offset tip portion extends distally therefrom.
415 Citations
21 Claims
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1. A catheter assembly, comprising:
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an elongated body having a proximal portion and a distal portion extending along a longitudinal axis, wherein the distal portion of the body is configured for intravascular delivery via over-the-wire or rapid exchange delivery techniques to a body lumen of a human patient; a pre-shaped spiral structure associated with the distal portion of the elongated body, wherein the spiral structure terminates in a flexible, curved distal tip portion, and wherein the elongated body and the pre-shaped spiral structure comprise a central lumen; and a plurality of electrodes associated with the spiral structure, wherein the pre-shaped spiral structure is transformable between— a low-profile configuration wherein a procedural guide wire is positioned in the central lumen of the spiral structure; and an expanded configuration wherein the procedural guide wire is at least partially retracted from the spiral structure toward the proximal portion of the elongated body, wherein, when the spiral structure is in the expanded configuration, the spiral structure comprises a plurality of revolutions formed about a central loop axis parallel with the longitudinal axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A catheter assembly, comprising:
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a catheter body including a proximal portion, a distal portion, and a lumen therethrough wherein the catheter body is configured for over-the-wire or rapid exchange delivery techniques; a helical structure associated with the distal portion of the catheter body, wherein the helical structure terminates in a flexible, curved distal tip; and a plurality of energy delivery elements carried by the helical structure, wherein the helical structure is selectively transformable between— a delivery state wherein a stylet or procedural guide wire is positioned in the lumen at the distal portion of the catheter body and the helical structure is generally straightened for delivery to a target treatment site in a body lumen; and an expanded state wherein the stylet or procedural guide wide wire is at least partially retracted from the distal portion of the catheter body and the helical structure is configured to position the energy delivery elements in stable contact with a wall of the body lumen at the target treatment site, wherein the helical structure, in the expanded state, comprises a plurality of revolutions formed about a central loop axis generally parallel with a longitudinal axis of the catheter body. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A catheter assembly, comprising:
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a catheter body having a proximal region, a distal region, and a central lumen extending at least partially therethrough; a treatment section at the distal region of the catheter body, wherein the treatment section comprises a coil composed of a shape memory material and having a plurality of loop segments arranged about a central loop axis, wherein the central loop axis is generally parallel with a longitudinal axis of the catheter body; and a plurality of independently operable electrodes disposed along a portion of the treatment section, wherein axial movement of a stylet disposed in the central lumen relative to the treatment section places the treatment section in one of (a) a low-profile delivery configuration wherein the treatment section comprises a generally straight shape, and (b) a deployed configuration wherein the treatment section comprises a coiled shape and the plurality of loop segments are longitudinally spaced apart along the central loop axis.
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Specification