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 device configured to stimulate an external nasal nerve at the junction of an upper lateral nasal cartilage and a nasal bone of a patient to activate the patient's lacrimal glands at the junction of the upper lateral nasal cartilage and the nasal bone, said device comprising:
an applicator having a handle and a skin interface, said skin interface having a thickness in a lateral direction between 0.5 mm and 5 mm and a skin contact surface comprising an edge which is curved in a medial direction and rounded in the lateral direction, said edge having a lateral radius in a range from 0.5 mm to 5 mm and a skin contact area in a range from 0.5 mm 2 to 10 mm 2 , wherein the skin interface is configured to be depressed in the ridge at the junction of the nasal bone and nasal cartilage; and
an actuator coupled to the skin interface and configured to vibrate the skin contact surface in an axial direction with a linear displacement in a range from 0.1 mm to 3 mm, wherein the handle is configured to allow the patient to manually press the skin interface in the axial direction to advance the lateral radius of the edge of the skin interface perpendicularly against the junction of the upper lateral nasal cartilage and nasal bone of the patient, at a frequency in a range from 100 Hz to 500 Hz, and with a force in a range from 0.5N to 5N to induce lacrimation.
2. The device of claim 1 , wherein skin contact surface comprises a compliant member configured to be pressed against the junction of the upper lateral nasal cartilage and nasal bone of the patient to transmit a variable amount of user controlled vibratory energy to the patient's external nasal nerve.
3. The device of claim 2 , wherein the compliant surface has a hardness in a range from Shore A40 to Shore A80.
4. The device of claim 2 , wherein the device is further configured to apply the skin interface to the skin at difference angles and positions to maximize activation of the lacrimal glands.
5. The device of claim 1 , wherein the actuator comprises a linear resonance actuator.
6. The device of claim 1 , wherein the actuator comprises an eccentrically weighted motor.
7. The device of claim 1 , wherein the actuator comprises a voice coil.
8. The device of claim 1 , wherein the actuator comprises an electromagnet.
9. The device of claim 1 , wherein the actuator comprises a piezoelectric crystal.
10. The device of claim 1 , wherein the lateral curvature determines a sharpness of the rounded edge, wherein the sharpness is configured to activate an external nasal nerve when pressed against the junction.
11. The device of claim 1 , wherein the actuator comprises a variable frequency and an application angle and position which are configured to be adjustable by the patient to optimize stimulation of the lacrimal gland.
12. The device of claim 1 , wherein the actuator is configured to create a user defined variation in excursion.
13. The device of claim 1 , further comprising an eccentrically weighted motor coupled to the actuator configured to allow the patient to vary a vibrational force to optimize stimulation of the lacrimal gland.