Multi-electrode catheter assemblies for renal neuromodulation and associated systems and methods
First Claim
1. A method, comprising:
- intravascularly delivering a catheter over a guide wire to a treatment site within a renal artery of a human patient, wherein the catheter comprises—
an elongated shaft; and
a treatment assembly at a distal region of the shaft, the treatment assembly comprising a support structure composed, at least in part, of multifilar stranded nitinol wire;
transforming the treatment assembly from a delivery state to an expanded state by proximally withdrawing the guide wire, wherein, in the expanded state, the support structure has a radially expanded, generally helical configuration shaped and sized to contact the wall of the renal artery and to allow blood to flow through the vessel; and
delivering electrical energy from one or more electrodes of the treatment assembly to renal nerves along the renal artery of the patient, thereby at least partially attenuating neural traffic to and/or from a kidney of the patient.
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Abstract
Catheter apparatuses, systems, and methods for achieving renal neuromodulation by intravascular access are disclosed herein. One aspect of the present technology, for example, is directed to a treatment device having a multi-electrode array configured to be delivered to a renal blood vessel. The array is selectively transformable between a delivery or low-profile state (e.g., a generally straight shape) and a deployed state (e.g., a radially expanded, generally spiral/helical shape). The multi-electrode array is sized and shaped so that the electrodes or energy delivery elements contact an interior wall of the renal blood vessel when the array is in the deployed (e.g., spiral/helical) state. The electrodes or energy delivery elements are configured for direct and/or indirect application of thermal and/or electrical energy to heat or otherwise electrically modulate neural fibers that contribute to renal function.
584 Citations
20 Claims
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1. A method, comprising:
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intravascularly delivering a catheter over a guide wire to a treatment site within a renal artery of a human patient, wherein the catheter comprises— an elongated shaft; and a treatment assembly at a distal region of the shaft, the treatment assembly comprising a support structure composed, at least in part, of multifilar stranded nitinol wire; transforming the treatment assembly from a delivery state to an expanded state by proximally withdrawing the guide wire, wherein, in the expanded state, the support structure has a radially expanded, generally helical configuration shaped and sized to contact the wall of the renal artery and to allow blood to flow through the vessel; and delivering electrical energy from one or more electrodes of the treatment assembly to renal nerves along the renal artery of the patient, thereby at least partially attenuating neural traffic to and/or from a kidney of the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A catheter, comprising:
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an elongated shaft; a treatment assembly at a distal portion of the elongated shaft and sized and shaped to be located at a target treatment site within a renal artery of a human patient, the therapeutic assembly having a support structure including (a) a control member comprising a pre-formed helical shape, and (b) a plurality of electrodes carried by the support structure, wherein the support structure is composed, at least in part, of multifilar stranded nitinol wire; and a radio-frequency identification (RFID) tag configured to store data related to catheter identification information and/or catheter usage information, wherein the elongated shaft and the treatment assembly together define therethrough a guide wire lumen configured to slidably receive a guide wire, and wherein axial movement of the guide wire relative to the treatment assembly transforms the support structure between (a) a low-profile delivery state and (b) an expanded state tending to assume the pre-formed helical shape of the control member. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification