System for stimulating a hypoglossal nerve for controlling the position of a patient's tongue
A system for controlling a position of a patient's tongue includes attaching at least one electrode to the patient's Hypoglossal nerve and applying an electric signal through the electrode to at least one targeted motor efferent located within the Hypoglossal nerve to stimulate at least one muscle of the tongue. The system may also include the use of more than one contact to target more than one motor efferent and stimulating more than one muscle. The stimulation load to maintain the position of the tongue may be shared by each muscle. The position of the patient's tongue may be controlled in order to prevent obstructive sleep apnea.
1. A method for controlling a position of a patient's tongue, the method comprising:
implanting an electrode having a plurality of contacts, the plurality of contacts being proximate a Hypoglossal nerve;
implanting an implantable pulse generator (IPG), the IPG being electronically coupled to the electrode;
programming the IPG, independent of respiration cycle, to deliver at least two electric signals to the plurality of contacts;
applying the at least two electric signals at a starting frequency via the plurality of contacts to at least two targeted motor efferent groups located within the Hypoglossal nerve to stimulate at least two muscles of the tongue; and
ramping the starting frequency downwards to a target frequency,
wherein programming the IPG includes:
assigning each contact to one of a plurality of functional groups,
keeping an amplitude of at least one electric signal of a first functional group at a target amplitude for a pre-determined amount of time and then replacing the at least one electric signal of the first functional group with at least one electric signal of a second functional group of the plurality of functional groups,
ramping an amplitude of the at least one electric signal of the second functional group from an initial level up to the target amplitude, and
ramping the amplitude of the at least one electric signal of the second functional group from the target amplitude down to a rest amplitude.
2. The method of claim 1 , wherein programming the IPG includes sequencing or interleaving the plurality of functional groups.
3. The method of claim 1 , wherein programming the IPG includes ramping the amplitude of the at least one electric signal of the first functional group of the plurality of functional groups from an initial level up to the target amplitude.
4. The method of claim 1 , wherein a period of the at least one electric signal of the first functional group partially overlaps with a period of the at least one electric signal of the second functional group.
5. The method of claim 1 , wherein a period of the at least one electric signal of the first functional group does not overlap with a period of the at least one electric signal of the second functional group.
6. The method of claim 1 , wherein programming the IPG includes sharing a generally level amount of stimulation between the plurality of contacts.
7. The method of claim 1 , wherein applying the at least two electric signals includes driving each contact by their own independent current source.
8. The method of claim 1 , wherein programming the IPG includes pulsing each contact at different or overlapping intervals.
9. The method of claim 1 , wherein the electrode includes a cuff housing and wherein implanting the electrode includes wrapping the cuff housing around a portion of the Hypoglossal nerve.
10. The method of claim 1 , wherein the at least two electric signals are applied to the Hypoglossal nerve via an open loop system.
11. The method of claim 1 further comprising: initiating a therapy session, wherein the applying the at least two electric signals is delayed for a predetermined amount of time after initiating the therapy session.
12. The method of claim 1 , wherein the at least two electric signals are applied at least once during both inhalation and exhalation of a respiration cycle.
13. The method of claim 1 , wherein the at least two electric signals are applied simultaneously.