System and method for reshaping an eye feature

• US 8,348,935 B2
• Filed: 09/11/2008
• Issued: 01/08/2013
• Est. Priority Date: 01/23/2008
• Status: Expired due to Fees

• Current Assignee: Avedro, Inc. (Glaukos Corporation)
• Original Assignee: Avedro, Inc. (Glaukos Corporation)
• Inventors: Muller, David, Scharf, Ronald, Ryan, Thomas, Marshall, Neal, Wu, Artie
• Primary Examiner(s): Peffley, Michael
• Assistant Examiner(s): VAHDAT, KHADIJEH A
• Application Number:
  US12/209,123
• Publication Number:
  US 20090209954A1
• Time in Patent Office: 1,580 Days
• Field of Search: 606 3- 7, 606 10- 20, 606 32- 41, 604/20, 607/153, 128/898
• US Class Current: 606/34
• CPC Class Codes: A61B 18/14 Probes or electrodes therefor
• CPC Class Codes: A61B 18/18 by applying electromagnetic radiation, e.g. microwaves radiation therapy A61N5/00
• CPC Class Codes: A61B 18/22 the beam being directed along or through a flexible conduit, e.g. an optical fibre; Couplings or hand-pieces therefor
• CPC Class Codes: A61B 2018/00029 open
• CPC Class Codes: A61B 2018/00083 low, i.e. electrically insulating
• CPC Class Codes: A61B 2018/1405 Electrodes having a specific shape
• CPC Class Codes: A61B 2018/1807 using light other than laser radiation
• CPC Class Codes: A61B 2090/065 for measuring contact or contact pressure
• CPC Class Codes: A61B 34/76 Manipulators having means for providing feel, e.g. force or tactile feedback
• CPC Class Codes: A61F 2009/00853 Laser thermal keratoplasty or radial keratotomy
• CPC Class Codes: A61F 2009/00872 Cornea
• CPC Class Codes: A61F 9/0079 using non-laser electromagnetic radiation, e.g. non-coherent light or microwaves
• CPC Class Codes: A61F 9/009 Auxiliary devices making contact with the eyeball and coupling in laser light, e.g. goniolenses apparatus for eye examination A61B3/0008

Abstract

A system for applying therapy to an eye includes an applicator having a conducting element configured to direct energy from an energy source to an application end of the conducting element, where the application end has at least one eye contact portion. A positioning system positions the at least one eye contact portion in stable engagement with the eye surface. The conducting element is disposed within a housing for the applicator and at least one adjustment system is employed to move the conducting element relative to the housing. The at least one adjustment system enables controlled movement of the conducting element and the at least one eye contact portion against the corneal surface. In particular embodiments, sufficient contact between the applicator and the cornea is determined by causing applanation of the cornea. In other embodiments, at least one measurement device is employed to determine when sufficient contact has been established.

Claims

1. A system for applying therapy to an eye, the system comprising:

an electrical energy source; and

an electrical energy conducting element extending from a proximal end to a distal end, the energy conducting element operably connected to the electrical energy source at the proximal end and configured to direct electrical energy to an eye positioned at the distal end, the energy conducting element including;

an outer conductor extending to the distal end; and

an inner conductor extending to the distal end and disposed within the outer conductor, the outer conductor and the inner conductor being separated by a gap;

a force measurement element configured to measure a force between at least one contact area and the surface of the eye;

a controller configured to receive, from the force measurement element, a first signal indicative of the measured force between the at least one contact area and the surface of the eye, the controller being further configured to determine whether at least a predetermined amount of force has been achieved based on the first signal; and

an adjustment system configured to move the at least one contact area at the distal end of the energy conducting element into engagement with the surface of the eye in response to a second signal received from the controller, the second signal being indicative of whether the measured force between the at least one contact area and the surface of the eye achieves at least the predetermined amount of force.

2. The system according to claim 1, wherein the inner conductor is moveable relative to the outer conductor and the outer conductor is moveable relative to the inner conductor.

3. The system according to claim 2, wherein the at least one contact area is disposed on the inner conductor and the adjustment system is configured to move the inner conductor relative to the outer conductor into engagement with the surface of the eye.

4. The system according to claim 3, wherein the force measurement element determines the movement of the inner conductor relative to the outer conductor when the outer conductor is in contact with the surface of the eye, the movement of the inner conductor indicating the force between the at least one contact area disposed on the inner conductor and the surface of the eye.

5. The system according to claim 2, wherein the at least one contact area is disposed on the outer conductor and the adjustment system is configured to move the outer conductor relative to the inner conductor into engagement with the surface of the eye.

6. The system according to claim 2, wherein the adjustment system comprises a first adjustment system and a second adjustment system, the at least one contact area includes an inner contact area disposed on the inner conductor and an outer contact area disposed on the outer conductor, the first adjustment system being configured to move the inner contact area into engagement with the surface of the eye until an inner force between the inner contact area and the surface of the eye determined by a first force measurement element achieves a first predetermined value, and the second adjustment system being configured to move the outer contact area into engagement with the surface of the eye until an outer force between the outer contact area and the surface of the eye determined by a second force measurement element achieves a second predetermined value, the first predetermined value being different from the second predetermined value.

7. The system according to claim 1, wherein the adjustment system is configured to further move the at least one contact area in response to the electrical energy conducting element directing the electrical energy to the eye.

8. The system according to claim 1, wherein the adjustment system includes at least one electromechanical device configured to move at least one of the inner conductor and the outer conductor.

9. The system according to claim 8, wherein the at least one electromechanical device includes an electric motor.

10. The system according to claim 9, wherein the force measurement element determines the force as a function of current in the electric motor.

11. The system according to claim 1, wherein the force measurement element includes a piezoelectric sensor.

12. The system according to claim 1, wherein the force measurement element includes a strain gauge.

13. The system according to claim 1, wherein the predetermined amount of force corresponds with the engagement causing a partial applanation of the surface of the eye.

14. The system according to claim 1, further comprising a housing, the electrical energy conducting element being disposed within the housing, the adjustment system being configured to independently move at least one of the inner conductor relative to the housing and the outer conductor relative to the housing.

15. The system according to claim 1, wherein the adjustment system is configured to transduce rotational movement provided by a motor into linear movement of at least one of the inner conductor and the outer conductor.

16. A method of using a system for applying therapy to an eye, the method comprising:

providing a system including an electrical energy source, an electrical energy conducting element, a force measurement element, a controller and an adjustment system, the electrical energy conducting element extending from a proximal end to a distal end, the energy conducting element operably connected to the electrical energy source at the proximal end and configured to direct electrical energy to an eye positioned at the distal end, the energy conducting element including an outer conductor extending to the distal end and an inner conductor extending to the distal end, the inner conductor being disposed within the outer conductor, the outer conductor and the inner conductor being separated by a gap;

measuring, using the force measurement element, a force between at least one contact area and the surface of the eye;

receiving, at the controller, a first signal from the force measurement element, the first signal being indicative of the measured force between the at least one contact area and the surface of the eye;

determining, via the controller, whether at least a predetermined amount of force has been achieved based on the first signal;

receiving, at the adjustment system, a second signal from the controller, the second signal being indicative of whether the measured force between the at least one contact area and the surface of the eye achieves at least the predetermined amount of force; and

moving, using the adjustment system, the at least one contact area at the distal end of the energy conducting element into engagement with the surface of the eye in response to the second signal received from the controller.

17. The method according to claim 16, wherein the inner conductor is moveable relative to the outer conductor and the outer conductor is moveable relative to the inner conductor.

18. The method according to claim 17, wherein the at least one contact area is disposed on the inner conductor and the adjustment system moves the inner conductor relative to the outer conductor into engagement with the surface of the eye.

19. The method according to claim 16, further comprising moving, using the adjustment system, the at least one contact area in response to the electrical energy conducting element directing the electrical energy to the eye.

20. The method according to claim 16, wherein the adjustment system includes at least one electromechanical device configured to move at least one of the inner conductor and the outer conductor.

21. The method according to claim 20, wherein the at least one electromechanical device includes an electric motor.

22. The method according to claim 21, wherein the force measurement element measures the force as a function of current in the electric motor.

23. The method according to claim 16, wherein the force measurement element includes a piezoelectric sensor.

24. The method according to claim 16, wherein the force measurement element includes a strain gauge.

25. The method according to claim 16, wherein the predetermined amount of force corresponds with the engagement causing a partial applanation of the surface of the eye.

26. The method according to claim 16, further comprising applying electrical energy through the electrical energy conducting element to the eye according to the at least one contact area.