| 摘要 |
A microkeratome and related surgical methods for performing lamellar keratotomies are provided. The microkeratome includes a guide ring assembly for placement on the eyeball, or ocular globe such that the globe's cornea protrudes therethrough. Means are provided for temporarily fixing the guide ring to the ocular globe, immobilizing the eyeball relative to the instrument. A cutting blade suitable for corneal resections is carried in a cutting head over the guide ring through a cutting path defined by the guide ring. An adjustable float head, also generally known as a plaque, is connected to the cutting head for at least partially compressing the cornea ahead of the blade, so as to set the desired thickness of the corneal resection. Means are further provided for driving the cutting head and float head across the guide ring, whereby the blade cuts at least partially through the cornea to perform the lamellar keratotomy. Various surgical corrections are obtainable through the use of arcuate and oblique plaques, as an alternative to planar plaques or float heads, where appropriate.
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