Methods for producing epithelial flaps on the cornea and for placement of ocular devices and lenses beneath an epithelial flap or membrane, epithelial delaminating devices, and structures of epithelium and ocular devices and lenses

• US 7,497,866 B2
• Filed: 01/17/2003
• Issued: 03/03/2009
• Est. Priority Date: 07/18/2000
• Status: Expired due to Fees

• Current Assignee: Tissue Engineering Refraction Incorporated
• Original Assignee: Tissue Engineering Refraction Incorporated
• Inventors: Perez, Edward
• Primary Examiner(s): Truong; Kevin T
• Assistant Examiner(s): NGUYEN, VI X
• Application Number:
  US10/346,664
• Publication Number:
  US 20030220653A1
• Time in Patent Office: 2,237 Days
• Field of Search: 606 4- 6, 606/107, 606/166
• US Class Current: 606/166
• CPC Class Codes: A61B 17/32 Surgical cutting instruments A61B18/042 takes precedence; suture cutters A61B17/0467; instruments for ligaturing or cutting A61B17/128; instruments for rupturing the amniotic membrane A61B17/4208; specially adapted knives for eye surgery A61F9/0133
• CPC Class Codes: A61B 2017/320052 Guides for cutting instruments by marking A61B2090/395
• CPC Class Codes: A61F 2/142 Cornea, e.g. artificial corneae, keratoprostheses or corneal implants for repair of defective corneal tissue
• CPC Class Codes: A61F 2/147 Implants to be inserted in the stroma for refractive correction, e.g. ring-like implants
• CPC Class Codes: A61F 9/013 Instruments for compensation of ocular refraction A61F9/008 takes precedence; Instruments for use in cornea removal, for reshaping or performing incisions in the cornea
• CPC Class Codes: A61F 9/0133 Knives or scalpels specially adapted therefor

Abstract

These methods, devices, and structures are useful in the field of ophthalmology; the devices and methods relate variously to separating or lifting corneal epithelium from the eye preferably in a substantially continuous layer, placing a lens or other suitable ocular or medical device beneath the epithelial membrane, and to the resulting structures formed by those procedures. The de-epilthelialization devices generally utilize a non-cutting separator or dissector that is configured to separate the epithelium at a naturally occurring cleavage surface in the eye between the epithelium and the corneal stroma (Bowman'"'"'s membrane), specifically separating in the region of the lamina lucida. The separator or dissector may have a structure that rolls or vibrates (or both) at that cleavage surface or interface during the dissection step. The separated epithelium may be lifted or peeled from the surface of the eye to form an epithelial flap or a pocket. The epithelium may then be replaced on the cornea after a refractive procedure or after placement of an ocular lens (or other subepithelial device) on the eye. The subepithelial device may comprise a wide variety of synthetic, natural, or composite polymeric materials. The step of replacing epithelial tissue upon the subepithelial device or upon the anterior corneal surface promotes epithelial healing.

Claims

1. A device for separating epithelium from an eye having a cornea with epithelium and a stroma, the device comprising an epithelial delaminator member configured to contact the stroma beneath the epithelium and thereby to apply a mechanical force beneath that epithelium to separate the epithelium from the stroma without cutting that stroma.

2. The device of claim 1 wherein the epithelial delaminator member is configured to produce a separated epithelium being substantially free of Collagen Type I and Collagen Type III.

3. The device of claim 1 wherein the epithelial delaminator member is configured to indent the stroma while applying the mechanical force beneath the epithelium.

4. The device of claim 1 wherein the epithelial delaminator member is configured to separate the epithelium in at least one continuous portion.

5. The device of claim 1 wherein the epithelial delaminator member is configured to separate the epithelium in one continuous portion.

6. The device of claim 1 wherein the epithelial delaminator member is configured to separate the epithelium and form an epithelial pocket.

7. The device of claim 6 wherein the epithelial delaminator member comprises a blunt dissector.

8. The device of claim 6 wherein the epithelial delaminator member comprises a spatula.

9. The device of claim 7 wherein the blunt dissector is configured to impart a shearing force.

10. The device of claim 7 wherein the blunt dissector is configured to impart an oscillating translational force.

11. The device of claim 6 further comprising, in combination, an implant configured to be placed on the stroma beneath the separated epithelium.

12. The device of claim 6 further comprising, in combination, an ocular lens configured to be placed on the stroma beneath the separated epithelium.

13. The device of claim 6 further comprising, in combination, an ocular lens comprising a synthetic polymer configured to be placed on the stroma beneath the separated epithelium.

14. The device of claim 1 wherein the epithelial delaminator member comprises a wire having a stiffness and size selected to separate the epithelium from the stroma.

15. The device of claim 14 wherein the wire has a cross section selected from the group consisting of round, square, oval, ellipsoid, rectangular, truncated oval, and bull-nosed.

16. The device of claim 14 wherein the wire has a length and a cross section that is not constant along that length.

17. The device of claim 14 wherein the wire has a prow positioned to lead a passage of the wire when passed beneath the epithelium.

18. The device of claim 14 wherein the wire is twisted along its length.

19. The device of claim 18 wherein the wire is helically twisted along its length.

20. The device of claim 18 wherein the wire is twisted non-uniformly along its length.

21. The device of claim 14 wherein the wire stiffness is selected at least partially by material selection of the wire.

22. The device of claim 14 wherein the wire stiffness is selected at least partially by adjusting the strain placed upon the wire.

23. The device of claim 14 further comprising a yoke supporting the wire.

24. The device of claim 23 wherein the yoke is configured to pass the wire beneath the epithelium at a direction of movement perpendicular to the wire.

25. The device of claim 23 wherein the yoke is configured to pass the wire beneath the epithelium at a direction of movement not perpendicular to the wire.

26. The device of claim 14 further comprising an oscillator configured to oscillate the wire.

27. The device of claim 26 where the oscillator is configured to oscillate the wire at a frequency between 100 and 350 Hz.

28. The device of claim 27 where the oscillator is configured to oscillate the wire at an amplitude between 2.0 and 3.0 mm.

29. The device of claim 27 wherein the oscillator is configured to oscillate the wire at a direction of movement perpendicular to the wire.

30. The device of claim 27 wherein the oscillator is configured to oscillate the wire at a direction of movement not perpendicular to the wire.

31. The device of claim 26 where the oscillator is configured to oscillate the wire at a frequency between 245 and 255 Hz.

32. The device of claim 26 where the oscillator is configured to oscillate the wire at an amplitude between 1.5 and 4.5 mm.

33. The device of claim 14 further comprising a suction apparatus comprising:

epithelial contact surfaces defining a suction chamber,

a slot for directing the wire to the epithelium, and

a vacuum source in vacuum communication with the suction chamber.

34. The device of claim 33 wherein the suction chamber comprises a volume between two epithelial contact surfaces.

35. The device of claim 33 wherein the contact surfaces are ring shaped.

36. The device of claim 33 wherein the suction apparatus further includes a port for entry of an ophthalmologic surgical instrument.

37. The device of claim 1 wherein the epithelial delaminator member is configured to roll as it contacts the stroma and separates the epithelium.

38. The device of claim 37 wherein the epithelial delaminator member is configured to roll passively as it contacts the stroma and separates the epithelium.

39. The device of claim 37 wherein the epithelial delaminator member is configured to roll actively as it contacts the stroma and separates the epithelium.

40. The device of claim 37 wherein the rollable epithelial delaminator member comprises a wire structure comprising at least two wires and the structure selected to separate the epithelium from the stroma.

41. The device of claim 40 wherein the wire structure has a stiffness and size selected to separate the epithelium from the stroma.

42. The device of claim 40 wherein the wire structure comprises more than two wires.

43. The device of claim 40 wherein the wire structure comprises wires laid side-by-side and twisted together along its length.

44. The device of claim 40 wherein the wire structure is helically twisted along its length.

45. The device of claim 40 wherein the wire structure is twisted non-uniformly along its length.

46. The device of claim 40 wherein the wire structure comprises braided wires.

47. The device of claim 37 wherein the rollable epithelial delaminator member comprises a wire structure comprising at least one wire having a non-smooth surface and the surface suitable for separating the epithelium from the stroma.

48. The device of claim 37 wherein the rollable epithelial delaminator member comprises a wire structure comprising at least one wire having a roughened surface suitable for separating the epithelium from the stroma.

49. The device of claim 1 wherein the epithelial delaminator member comprises a blunt dissector.

50. The device of claim 49 wherein the blunt dissector is configured to impart a shearing force.

51. The device of claim 49 wherein the blunt dissector is configured to impart an oscillating translational force.

52. The device of claim 1 wherein the epithelial delaminator member comprises a spatula.

53. The device of claim 1 further comprising, in combination, an implant configured to be placed on the stroma beneath the separated epithelium.

54. The device of claim 1 further comprising, in combination, an ocular lens configured to be placed on the stroma beneath the separated epithelium.

55. The device of claim 1 further comprising, in combination, an ocular lens comprising a synthetic polymer configured to be placed on the stroma beneath the separated epithelium.

56. A device for lifting epithelium from an eye having a cornea with an anterior surface comprising an epithelial delaminator configured to apply a mechanical force to the anterior surface to lift the epithelium in a continuous layer.

57. The device of claim 56 wherein the epithelial delaminator comprises a

suction apparatus comprising:

a suction chamber having an epithelial contact surface and

a vacuum source,

wherein the suction chamber and the vacuum source are in vacuum communication.

58. The device of claim 57 wherein the suction chamber comprises a wall.

59. The device of claim 57 wherein the suction chamber is a hemispherical cup.

60. The device of claim 59 wherein the cup is transparent.

61. The device of claim 59 wherein the cup is comprised of a defonnable material.

62. The device of claim 57 wherein the contact surface is ring shaped.

63. The device of claim 62 wherein the ring shaped contact surface is comprised of a material selected from the group consisting of a metal, a polymer, and an elastomer.

64. The device of claim 57 wherein the suction chamber includes a port or a groove for entry of a fluid.

65. The device of claim 64 wherein the epithelial delarninator further comprises a fluid.

66. The device of claim 65 wherein the fluid comprises hypertonic saline.

67. The device of claim 57 wherein the suction chamber includes a port or a groove for entry of an ophthalmological surgical instrument.

68. The device of claim 57 wherein the vacuum source is a manual pump.

69. The device of claim 57 wherein the vacuum source is a motorized pump.

70. The device of claim 57 further comprising a pressure gauge.

71. The device of claim 57 wherein the vacuum source is a syringe.

72. The device of claim 56 wherein the delaminator is a blunt dissector.

73. The device of claim 72 wherein the delaminator comprises a rotating wire.

74. The device of claim 72 wherein the delaminator comprises a vibrating wire.

75. The device of claim 72 wherein the delaminator comprises a curved spatula.

76. The device of claim 72 wherein the blunt dissector is configured to impart a shearing force.

77. The device of claim 56 wherein the epithelial delaminator is configured to apply the force by injecting a fluid between the epithelium and the anterior surface.

78. The device of claim 77 wherein the epithelial delaminator further comprises a fluid.

79. The device of claim 78 wherein the fluid comprises hypertonic saline.

80. The device of claim 78 wherein the fluid comprises a silicone solution.

81. The device of claim 77 wherein the fluid is air.

82. The device of claim 56 wherein the epithelial delaminator is configured to apply the force by injecting a gel between the epithelium and the anterior surface.