Method for symmetry-based implant control
Apparatus comprising (1) a breathing sensor, configured to detect a breathing-related factor of a subject; (2) at least a first electrode configured to be placed in a vicinity of a respective first hypoglossal nerve, and to be driven, in response to the detected breathing-related factor, to apply a first electrical current to the first hypoglossal nerve; (3) at least a second electrode configured to be placed in a vicinity of a respective second hypoglossal nerve, and to be driven, in response to the detected breathing-related factor, to apply a second electrical current to the second hypoglossal nerve; and (4) circuitry configured to, in response to a detected symmetry-related factor indicative of a degree of symmetry of the subject, configure at least one current selected from the group consisting of: the first current and the second current. Other embodiments are also described.
1. A method for use with a body of a subject, the method comprising:
detecting a breathing-related factor of the subject;
in response to the detected breathing-related factor:
applying a first electrical current to a first hypoglossal nerve of the subject, and
applying a second electrical current to a second hypoglossal nerve of the subject;
detecting a symmetry of a response of the subject to the applied first and second currents; and
in response to the detected symmetry, configuring at least one current selected from the group consisting of: the first current and the second current.
2. The method according to claim 1 , wherein detecting the breathing-related factor comprises extracorporeally detecting the breathing-related factor.
3. The method according to claim 1 , wherein:
detecting the breathing-related parameter comprises detecting the breathing-related parameter using a breathing sensor;
applying the first electrical current comprises applying the first electrical current using a first electrode disposed in a vicinity of the first hypoglossal nerve;
applying the second electrical current comprises applying the second electrical current using a second electrode disposed in a vicinity of the second hypoglossal nerve; and
configuring the at least one selected current comprises configuring the at least one selected current using circuitry configured to configure the at least one selected current in response to the detected symmetry.
4. The method according to claim 3 , wherein detecting the symmetry comprises detecting the symmetry using a symmetry sensor.
5. The method according to claim 4 , wherein detecting the symmetry comprises detecting a mechanical symmetry of the response of the subject.
6. The method according to claim 4 , wherein detecting the symmetry comprises detecting the symmetry using a symmetry sensor that includes an accelerometer.
7. The method according to claim 4 , wherein detecting the symmetry comprises detecting an electrical symmetry of the response of the subject.
8. The method according to claim 4 , wherein detecting the symmetry comprises detecting the symmetry using a symmetry sensor that includes an electrode.
9. The method according to claim 8 , wherein detecting the symmetry comprises detecting the symmetry using a symmetry sensor that includes an electromyographic electrode.
10. The method according to claim 4 , wherein:
detecting the symmetry comprises detecting the symmetry-related factor using an extracorporeal control unit that includes the symmetry sensor, and
the method further includes transmitting a wireless signal at least in part responsively to the detected symmetry.
11. The method according to claim 3 , wherein:
the circuitry includes a first circuitry,
a first implant includes the first circuitry and the first electrode,
applying the first current comprises applying the first current using the first electrode of the first implant,
a second implant includes the second electrode and second circuitry, and
applying the second current comprises applying the second current using the second electrode of the second implant.
12. The method according to claim 11 , wherein detecting the symmetry comprises detecting the symmetry using a symmetry sensor of a control unit, and wherein the method further comprises, using the control unit;
transmitting a wireless signal at least in part responsively to the detected symmetry, and
configuring the wireless signal to independently address the first implant and the second implant.
13. The method according to claim 11 , wherein at least one implant selected from the group consisting of: the first implant and the second implant, includes the breathing sensor, and detecting the breathing-related factor comprises detecting the breathing-related factor using the breathing sensor of the at least one selected implant.
14. The method according to claim 11 , wherein at least one implant selected from the group consisting of: the first implant and the second implant, includes a symmetry sensor, and detecting the symmetry comprises detecting the symmetry using the symmetry sensor of the at least one selected implant.
15. The method according to claim 3 , wherein the circuitry includes circuitry of a control unit, and configuring the at least one selected current comprises configuring the at least one selected current using the circuitry of the control unit.
16. The method according to claim 15 , wherein configuring the at least one selected current comprises configuring the at least one selected current using circuitry of an implantable control unit, disposed within the body of the subject.
17. The method according to claim 15 , wherein the control unit includes the breathing sensor, and detecting the breathing-related factor comprises detecting the breathing-related factor using the breathing sensor of the control unit.
18. The method according to claim 15 , wherein the control unit comprises a symmetry sensor, and wherein detecting the symmetry comprises detecting the symmetry using the symmetry sensor of the control unit.
19. The method according to claim 18 , further comprising transmitting a wireless signal using the control unit, in response to detecting the symmetry.
20. A method, comprising:
implanting, in a vicinity of a first anatomical site of a subject, a first implant including at least one electrode and circuitry configured to drive the at least one electrode of the first implant to apply a first electrical current to the first anatomical site;
implanting, in a vicinity of a second anatomical site of a subject, a second implant including at least one electrode and circuitry configured to drive the at least one electrode of the second implant to apply a second electrical current to the second anatomical site; and
subsequently, detecting a symmetry of a response of the subject to the applied first and second currents, and in response to the detected symmetry, configuring at least one implant selected from the group consisting of: the first implant and the second implant.
21. The method according to claim 20 , wherein implanting the first implant comprises implanting the first implant in a vicinity of a first hypoglossal nerve of the subject, and implanting the second implant comprises implanting the second implant in a vicinity of a second hypoglossal nerve of the subject.
22. The method according to claim 20 , wherein detecting comprises detecting a mechanical symmetry of the response of the subject.
23. The method according to claim 20 , wherein detecting comprises detecting an electrical symmetry of the response of the subject.
24. The method according to claim 20 , wherein configuring comprises modifying the current applied by the at least one selected implant.
25. The method according to claim 24 , wherein modifying comprises altering a balance of amplitude between the first electrical current and the second electrical current.