A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
33/113, 349/36,
A61B 3/10 (2006.01) A61B 8/10 (2006.01) A61F 9/013 (2006.01) H03K 5/04 (2006.01)
Patent
CA 1194978
ABSTRACT An apparatus is disclosed for measuring the thickness of the corneas 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.
394839
Kremer Frederic B.
O'brien Edward R.
Accutome Inc.
Riches Mckenzie & Herbert Llp
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