Positioning methods for intravascular electrode arrays for neuromodulation
A method for positioning an electrode array of a neuromodulation catheter at a target circumferential position along a posterior wall of a superior vena cava includes advancing the catheter to a target longitudinal position within the superior vena cava, and orienting a marker on the extracorporeal portion of the catheter in a circumferential orientation known to position the array at the target circumferential position along the posterior wall. A method of positioning the array at a target longitudinal position includes advancing the catheter into the superior vena cava and using features of the catheter to detect the location of right atrial tissue, such as by sensing for a P-wave using an electrogram captured using an electrode carried at a distal end of the catheter, or by using such electrodes to capture the atrium using atrial pacing pulses. Once the location of the right atria is determined, the electrode array may be deployed in a position known to be proximal to the atrium.
1. A method for positioning an electrode array of a neuromodulation catheter at a target circumferential position along a posterior wall of a superior vena cava located within a patient body, the method comprising:
providing a neuromodulation catheter including a catheter body, an electrode array on a distal portion the catheter body, and a marker on the catheter body, the marker positioned to face a mid-anterior position when the electrode array is at the target circumferential position along the posterior wall;
advancing the catheter to a target longitudinal position within the superior vena cava, the marker remaining outside the patient body;
with the patient in a supine position, orienting the marker perpendicular to the patient body.
2. The method according to claim 1 , wherein the marker is a stripe.
3. The method of claim 1 , wherein when the marker is oriented perpendicular to the patient body, a plurality of the electrodes extend in a longitudinal direction within the blood vessel.
4. The method of claim 1 , wherein when the marker is oriented perpendicular to the patient body, a plurality of the electrodes extend in a circumferential direction within the blood vessel.