Method and Apparatus for Laser Surgery of the Cornea
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
a laser surgery and cornea technology, applied in the field of corneal surgery, can solve the problem that the importance of the optical quality of the cornea cannot be over-emphasized, and achieve the effect of accurate and safe operation, correction of myopia and/or astigmatism
Inactive Publication Date: 2006-09-28
LAI SHUI T
View PDF62 Cites 60 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Benefits of technology
[0055] It is another object of the present invention to provide an improved method for performing a cornea transplant operation. It is another object of the present invention to provide an improved method of making incision
Problems solved by technology
Hence, the importance of the optical quali
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0117] Throughout this description, the preferred embodiment and examples shown should be considered as exemplars, rather than limitations on the method and apparatus of the present invention.
[0118] Background Information
[0119] The laser apparatus and system disclosed in this invention is for achieving two principal objectives:
[0120] (1) The damage zone underneath the material ablated by the present laser system must be substantially reduced in comparison to prior art laser systems.
[0121] (2) For each laser pulse deposited on the cornea, a definite predetermined depth of tissue is to be ablated. The ablated depth per laser pulse must be controllable and about 0.2 microns or less, and preferably about 0.05 microns or less.
[0122] A brief discussion on the mechanism of the ablation process is useful to understand how the stated objectives can be achieved by the teaching of the present invention. It is a well-known fact that laser ablation can occur when the laser beam intensity is...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Property
Measurement
Unit
Length
aaaaa
aaaaa
Time
aaaaa
aaaaa
Force
aaaaa
aaaaa
Login to view more
Abstract
A laser-based method and apparatus for corneal surgery. The present invention is intended to be applied primarily to ablate organic materials, and human cornea in particular. The invention uses a laser source which has the characteristics of providing a shallow ablation depth (0.2 microns or less per laser pulse), and a low ablation energy density threshold (less than or equal to about 10 mJ/cm.sup.2), to achieve optically smooth ablated corneal surfaces. The preferred laser includes a laser emitting approximately 100-50,000 laser pulses per second, with a wavelength of about 198-300 nm and a pulse duration of about 1-5,000 picoseconds. Each laser pulse is directed by a highly controllable laser scanning system. Described is a method of distributing laser pulses and the energy deposited on a target surface such that surface roughness is controlled within a specific range. Included is a laser beam intensity monitor and a beam intensity adjustment means, such that constant energy level is maintained throughout an operation. Eye movement during an operation is corrected for by a corresponding compensation in the location of the surgical beam. Beam operation is terminated if the laser parameters or the eye positioning is outside of a predetermined tolerable range. The surgical system can be used to perform surgical procedures including removal of corneal scar, making incisions, cornea transplants, and to correct myopia, hyperopia, astigmatism, and other corneal surface profile defects.
Description
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation of U.S. application Ser. No. 10 / 801,891, now published as 2004 / 0199150, which is a continuation of U.S. patent application Ser. No. 09 / 799,412, filed Mar. 5, 2001, now U.S. Pat. No. 6,706,036, which is a divisional of U.S. patent application Ser. No. 09 / 130,547 filed Aug. 6, 1998, now U.S. Pat. No. 6,210,401 which is a continuation of patent application Ser. No. 07 / 788,424, filed on Nov. 6, 1991, all of which are incorporated by reference herein in their entirety. Priority is claimed to each of these applications.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] This invention relates to methods of, and apparatus for, surgery of the cornea, and more particularly to a laser-based method and apparatus for corneal surgery. [0004] 2. Related Art [0005] The concept of correcting refractive errors by changing the curvature of the eye was brought forth early on, as illustrated in the notable...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.