Methods for positioning signal delivery devices to treat sleep apnea, and associated devices and treatments
The present technology is generally directed to methods for addressing a patient's sleep apnea. At least some of the methods can include one or more of percutaneously inserting an implantable signal delivery device at an insertion point on the patient's neck, moving the signal delivery device in a medial-to-lateral direction toward an ansa cervicalis nerve of the patient, and implanting the signal delivery device at a target location at least proximate to the ansa cervicalis nerve. The signal delivery device can include at least one electrode positioned to deliver a modulation signal to tissue at least proximate to the target location, such as a portion of the ansa cervicalis nerve. In some embodiments, delivery of the modulation signal can induce caudal traction in the patient and thereby address the patient's sleep apnea.
1. A method for addressing sleep apnea in a patient, the method comprising:
percutaneously inserting an implantable signal delivery device at an insertion point on the patient's neck;
moving the signal delivery device in a lateral-to-medial direction toward a branch of an ansa cervicalis nerve of the patient that bifurcates to innervate both an inferior belly of a sternohyoid muscle of the patient and a sternothyroid muscle of the patient; and
implanting the signal delivery device at a target location at least proximate to the branch of the ansa cervicalis nerve, wherein the signal delivery device includes at least one electrode positioned to deliver a modulation signal to tissue at least proximate to the target location and thereby cause a motor response in the sternohyoid muscle and the sternothyroid muscle to address the patient's sleep apnea.
2. The method of claim 1 wherein moving the signal delivery device includes moving the signal delivery device toward a mid-sagittal plane of the patient at an angle relative to the mid-sagittal plane of between about 20 degrees and about 80 degrees.
3. The method of claim 1 wherein moving the signal delivery device includes moving the signal delivery device toward a mid-sagittal plane of the patient at an angle relative to the mid-sagittal plane of between about 45 degrees and about 80 degrees.
4. The method of claim 1 , further comprising, before percutaneously inserting the implantable signal delivery device, rotating the patient's head posteriorly to expose the insertion point.
5. The method of claim 1 wherein implanting the signal delivery device includes implanting the signal delivery device at least proximate to an inferior branch of the ansa cervicalis nerve of the patient.
6. The method of claim 1 wherein implanting the signal delivery device includes implanting the signal delivery device at least proximate to a distal end of the branch of the ansa cervicalis nerve to deliver the modulation signal to a motor point of the branch.
7. The method of claim 1 wherein implanting the signal delivery device at least proximate to the target location includes implanting the signal delivery device at least proximate to a sternothyroid muscle, a sternohyoid muscle, an omohyoid muscle, and/or a thyrohyoid muscle of the patient.
8. The method of claim 1 , further comprising delivering the modulation signal to the target tissue to increase the stability of at least a portion of an airway of the patient, which includes one or more of (i) increasing a stiffness of at least a portion of a pharyngeal wall of the airway of the patient, (ii) increasing a dimension of a retropalatal airway of the patient, and (iii) decreasing a resistance to airflow through at least the portion of the airway.
9. The method of claim 1 , further comprising delivering the modulation signal to the target tissue to induce caudal traction by lowering one or both of a hyoid bone of the patient and/or thyroid cartilage of the patient.
10. The method of claim 1 wherein percutaneously inserting the signal delivery device includes moving the signal delivery device in an anterior-to-posterior direction.
11. The method of claim 1 wherein percutaneously inserting the signal delivery device includes moving the signal delivery device in an inferior-to-superior direction.
12. The method of claim 1 wherein percutaneously inserting the signal delivery device includes moving the signal delivery device in a superior-to-inferior direction.
13. The method of claim 1 wherein implanting the signal delivery device at the target location includes implanting the signal delivery device at least partially between the sternohyoid muscle and the sternothyroid muscle.
14. The method of claim 1 wherein the branch bifurcates into a first sub-branch that innervates the inferior belly of the sternohyoid muscle and a second sub-branch that innervates the sternothyroid muscle, and wherein implanting the signal delivery device at the target location includes implanting the signal delivery device at least partially between the first sub-branch and the second sub-branch.
15. The method of claim 1 wherein the branch bifurcates into a first sub-branch that innervates the inferior belly of the sternohyoid muscle at one or more first motor points and a second sub-branch that innervates the sternothyroid muscle at one or more second motor points, and wherein implanting the signal delivery device at the target location includes implanting the signal delivery device to deliver the modulation signal to the one or more first motor points and/or the one or more second motor points.
16. The method of claim 1 wherein moving the signal delivery device in the lateral-to-medial direction includes positioning at least a portion of the signal delivery device between the sternohyoid muscle and the sternothyroid muscle.
17. The method of claim 1 wherein moving the signal delivery device in the lateral-to-medial direction includes advancing the signal delivery device along a trajectory that is anterior to a common carotid artery of the patient and an internal jugular vein of the patient.