Therapeutic ultrasound for eye disorders
Methods and devices are described which allow sound waves to be safely be applied to the eyelid of an eye of a patient or through the eyelid to other structures in the eye or to or through structures in the facial region to effect changes to one or more structures in and around the eye or directly through the cornea or sclera to regions of the eye to treat one or more diseases of the eye.
1. A method for stimulating tear production in a patient, said method comprising: (a) selecting a patient suffering from dry eye;
(b) positioning a vibratory surface at a location on the patient's face where the patient's upper lateral nasal cartilage meets the patient's nasal bone over a patient's external nasal nerve; and
(c) vibrating the vibratory surface at a frequency and a displacement selected to stimulate the lacrimal nerve via the external nasal nerve to mechanically produce tears.
2. The method of claim 1 , wherein the vibratory surface is vibrated a frequency in a range from 10 Hz to 1000 Hz.
3. The method of claim 2 , wherein the vibratory surface is vibrated a frequency in a range from 50 Hz to 500 Hz.
4. The method of claim 3 , wherein the vibratory surface is vibrated with a displacement in a range from 0.5 mm to 2 mm.
5. The method of claim 4 , wherein the vibratory surface has a skin contact area in a range from 10 mm 2 to 20 mm 2 .
6. The method of claim 2 , wherein the vibratory surface is vibrated with a displacement in a range from 0.1 mm to 5 mm.
7. The method of claim 6 , wherein the vibratory surface has a skin contact area in a range from 0.5 mm 2 to 20 mm 2 .
8. The method of claim 7 , wherein the vibratory surface has a hardness in a range from Shore A40 to Shore A80.
9. The method of claim 8 , wherein the vibratory surface is formed on a polymeric interface body.
10. The method of claim 9 , wherein polymeric interface body has a thickness in a range from 1 mm to 10 mm.
11. The method of claim 10 , wherein polymeric interface body has a thickness in a range from 2 mm to 5 mm.
12. The method of claim 11 , wherein the polymeric interface body has a rounded edge circumscribing at least a portion of the vibratory surface.
13. The method of claim 12 , wherein the rounded edge has a radius in a range from 0.5 mm to 5 mm.
14. The method of claim 10 , wherein the polymeric interface body has a square edge circumscribing at least a portion of the vibratory surface.
15. The method of claim 10 , wherein the polymeric interface body has a rigid edge circumscribing at least a portion of the vibratory surface.
16. The method of claim 1 , wherein the vibratory surface is vibrated with a pulsed duty cycle in a range from 10% to 90%.
17. The method of claim 16 , wherein the vibratory surface is vibrated with a pulsed duty cycle in a range from 50% to 90%.
18. The method of claim 1 , wherein the vibratory surface applies a force to the location on the patient's face in a range between 0.5N and 5N.
19. The method of claim 1 , wherein the vibratory surface is engaged against the patient's face with an upward directionality.
20. A method for stimulating tear production in a patient, said method comprising: (a) selecting a patient suffering from dry eye;
(b) positioning a vibratory surface on the patient's face at a region on a patient's face at a junction of the patient's upper lateral nasal cartilage and nasal bone over a patient's external nasal nerve; and
(c) vibrating the vibratory surface at a frequency and a displacement selected to stimulate the lacrimal nerve to mechanically stimulate the patient's external nasal nerve to indirectly stimulate the patient's lacrimal nerve to produce tears.
21. The method of claim 20 , wherein the vibratory surface is positioned at a location from 6.5 mm to 8.5 mm lateral to the patient's nasal midline at the region.
22. The method of claim 21 , wherein vibratory surface applies a force over an area of 5 mm 2 to 20 mm 2 on the nose at frequency of 100 Hz to 300 Hz.
23. The method of claim 21 , wherein the force applied by the vibratory surface is in a range between 0.5N and 5N.
24. The method of claim 21 , wherein the vibratory surface moves in a linear direction with an excursion of 1 to 2 mm.
25. The method of claim 20 , wherein positioning a vibratory surface comprises engaging a vibratory surface on a hand held device against the bony region.
26. The method of claim 20 , wherein the vibratory surface moves in a linear direction in one dimension.
27. A method for stimulating tear production in a patient, said method comprising: (a) selecting a patient suffering from dry eye;
(b) positioning an applicator having a vibratory surface at a location on the patient's face where the patient's upper lateral nasal cartilage meets the patient's nasal bone over a patient's external nasal nerve; and
(c) vibrating the vibratory surface at a frequency and a displacement selected to stimulate the lacrimal nerve to mechanically produce tears;
wherein the patient holds the applicator in a hand and presses the vibratory surface against the location on the patient's face while the vibratory surface vibrates.