Title:
ラメラを分離する方法
Document Type and Number:
Japanese Patent JP4094836
Kind Code:
B2
Abstract:
An apparatus (10) for separating lamellae (50, 50a, 50b, 50c) in the stroma (34) of an eye (26) includes means (12, 14, 16, 20) for finding a focal depth at an interface layer between lamellae (50, 50a, 50b, 50c) in the stroma (34). Means are provided (12, 18, 20) for sequentially focusing a laser beam (22) to a plurality of focal points (73) in the stroma (34) to photodisrupt stromal tissue, separate the lamellae (50, 50a, 50b, 50c) and create a photodisruptive response thereto. The photodisruptive response is indicative of a diameter of a gas bubble (60, 62) created in the stroma (34) during photodisruption of the stromal tissue. The apparatus includes further means (14) for alternating from a first energy level to a second energy level when the photodisruptive response is less than a reference value, and from the second energy level to said first energy level when the photodisruptive response is greater than the reference value. Maintenance of a proper focal depth can be periodically verified by maintaining a birefringent reference using an ellipsometer (14). Once the lamellae (50, 50a, 50b, 50c) are separated, a flap of corneal tissue is be created that can be lifted to expose underlying stromal tissue for further surgical photodisruption.
Inventors:
Josef Billet
Application Number:
JP2001300080A
Publication Date:
June 04, 2008
Filing Date:
September 28, 2001
Export Citation:
Assignee:
20/10 Perfect Vision Optiche Guerete Gamebha
International Classes:
A61B18/20; A61F9/007; A61F9/013; A61N5/06; A61B18/00; A61F9/008; A61F9/01
Domestic Patent References:
| JP11192253A |
Foreign References:
| WO1994009849A1 | ||||
| US6099522 |
Attorney, Agent or Firm:
Hideto Asamura
Hajime Asamura
Toru Mori
Yutaka Yoshida
Hajime Asamura
Toru Mori
Yutaka Yoshida