EP 0850089 A4 20000412 - INTRASTROMAL PHOTO-REFRACTIVE KERATECTOMY
Title (en)
INTRASTROMAL PHOTO-REFRACTIVE KERATECTOMY
Title (de)
FOTO-REFRAKTIVE, INTRASTROMALE KERATEKTOMIE
Title (fr)
KERATOTOMIE PAR PHOTO-REFRACTION INTRASTROMALE
Publication
Application
Priority
- CA 2226949 A 19980216
- US 9612556 W 19960730
- US 51658195 A 19950817
Abstract (en)
[origin: WO9706856A1] A method for performing intrastromal photo-refractive keratectomy in the cornea (12) of an eye using a pulsed laser beam, includes the initial step of focusing the beam to a focal spot at a selected starting point in the stroma (22). The starting point is located at a predetermined distance behind the epithelium (18) of the cornea. While focused on the starting point, the laser beam is pulsed to disrupt a volume of stromal tissue (36) which is substantially equal to the volume of the focal spot. Subsequently, the beam is focused in a patterned sequence to focal spots at other discrete points in the stroma. At each point the stromal tissue is photo-disrupted. With this progressive pattern of photo-disruption, each spot is placed substantially adjacent a volume of previously disrupted tissue. The resultant photo-disrupted tissue creates a layer which is substantially centro-symmetrical around the optical axis. A plurality of layers can be removed to create a cavity in the stroma. When the cavity collapses, the corneal curvature is changed as desired.
IPC 1-7
IPC 8 full level
A61B 18/20 (2006.01); A61F 9/007 (2006.01); A61F 9/01 (2006.01)
CPC (source: EP)
A61F 9/008 (2013.01); A61F 9/00827 (2013.01); A61F 2009/00872 (2013.01); A61F 2009/00897 (2013.01)
Citation (search report)
- [Y] EP 0657151 A1 19950614 - INTELLIGENT SURGICAL LASERS [US]
- [YD] US 4907586 A 19900313 - BILLE JOSEF F [US], et al
- See references of WO 9706856A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 9706856 A1 19970227; CA 2226949 A1 19990816; CA 2226949 C 20090505; EP 0850089 A1 19980701; EP 0850089 A4 20000412; JP H11511051 A 19990928
DOCDB simple family (application)
US 9612556 W 19960730; CA 2226949 A 19980216; EP 96928030 A 19960730; JP 50931097 A 19960730