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Microkeratome cutting blade assembly and method for making the same

A microkeratome and cutting blade technology, applied in ophthalmic surgery and other directions, can solve problems such as difficulty, difficulty in adequately correcting patients' vision, and difficulty in detecting corneal flap thickness.

Inactive Publication Date: 2007-12-26
BAUSCH & LOMB INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Conversely, if the corneal flap is too thin, the flap will be prone to rupture, or it will be difficult to correct the patient's vision adequately without complications such as halos
[0009] While corneal pachymetry is readily available prior to LASIK surgery, it has proven particularly difficult to measure the corneal thickness of the eye by turning the flap back and due to changes in hydration of the flap and cornea under the operating lights in the operating room. Extremely fast, so it is also extremely difficult to obtain a reliable measurement of corneal flap thickness

Method used

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  • Microkeratome cutting blade assembly and method for making the same
  • Microkeratome cutting blade assembly and method for making the same
  • Microkeratome cutting blade assembly and method for making the same

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Embodiment Construction

[0039] Figure 1 shows a microkeratome cutting blade assembly 10 of the present invention. The assembly 10 includes a cutting blade 12 and a blade holder 14 connected to the cutting blade 12 . Cartridge 14 is preferably attached to cutting blade 12 by post members 16 passing through apertures or through holes (not shown) in cutting blade 12 using known methods such as heat staking. However, other joining means such as cold staking, use of adhesives or other means are also possible. Also, the apertures need not be through holes as is known, but can be matching indentations and protrusions in the cartridge and blade. The difference between this assembly 10 and prior art assemblies is that the blade extension indicated by numeral 18 is controlled within a tolerance of at least 0.016 millimeters (six ten thousandths of an inch) to help and provide consistent, precise flap thickness. Such tight tolerance and blade extension have hitherto been unknown. For example, in the prior a...

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Abstract

A microkeratome cutting blade assembly (10) includes a cutting blade (12) attached to a blade holder (14). A blade extension (18) is controlled to within at least six (6) ten-thousandths of an inch of a tangent extension length.

Description

technical field [0001] The present invention relates to cutting blade assemblies, and more particularly to cutting blade assemblies for microkeratomes used in ophthalmic surgery. Background technique [0002] In recent years, Laser-Assisted In-situ Keratomileusis (Laser-Assisted In-situ Keratomileusis) or LASIK surgery has become a popular and effective vision correction surgical procedure. Before a portion of the patient's corneal tissue can be laser ablated to correct the patient's vision, the patient's corneal flap must be formed. [0003] The average thickness of a typical cornea is about 520 microns. The ideal typical flap thickness for corneal flaps formed prior to laser ablation and LASIK surgery is approximately 160 to 200 microns. These corneal flaps are known to be made using a microkeratome that moves in a straight line, arcuate shape, or even in a horizontal hinged path. Microkeratomes typically cut the corneal flap using a cutting blade assembly made from sta...

Claims

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Application Information

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IPC IPC(8): A61F9/013
CPCA61F9/0133
Inventor 伊恩·A·鲍威尔克雷格·A·巴里莱-约瑟夫森迈克尔·H·多布纳彼得·J·黑尔茨詹姆斯·基尔希约翰·J·韦德恩本纳劳伦斯·J·卡尔夏大中
Owner BAUSCH & LOMB INC
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