04546773 is referenced by 30 patents and cites 10 patents.

An apparatus is disclosed for measuring the thickness of the cornea and for regulating the depth of a surgical blade in relation to the local corneal thickness. Corneal thickness is measured by first directing ultrasonic pulses towards the cornea and timing the interval between reflected pulses. The apparatus also includes a pulse stretcher for enlarging the width of the pulse representing the interval between pulses reflected from the inner and the outer surfaces of the cornea, so that the time between pulses can be accurately measured by a conventional, low-frequency electronic clock. The invention further comprises electronic gating means for rejecting spurious pulses.

Title
Apparatus to measure conical thickness
Application Number
227753
Publication Number
4546773
Application Date
May 7, 1984
Publication Date
October 15, 1985
Inventor
Edward R O Brien III
Wayne
PA, US
Frederic B Kremer
Bala Cynwyd
PA, US
Agent
Steele Gould & Fried
Assignee
Accutome
PA, US
IPC
A61B 10/00
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