Apparatus for measuring the thickness of corneas

Details Apparatus for measuring the thickness of corneas Apparatus for measuring the thickness of corneas

1983-02-22

1986-07-08

Howell, Kyle L.

Surgery

Truss

Pad

73612, A61B 1000

Patent

active

045987149

ABSTRACT:
An apparatus is disclosed for measuring the thickness of the corneas. 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.

REFERENCES:
patent: 3371660 (1968-03-01), Carlin
patent: 3827287 (1974-08-01), Boggs et al.
patent: 4261367 (1981-04-01), Freese
Wells, P. N. T. "Ultrasonics in Clinical Diagnosis", Churchill Livingstone, N.Y. 1977, pp. 87-96.

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