Method and apparatus for excision endpoint control

Details Method and apparatus for excision endpoint control Method and apparatus for excision endpoint control

1991-10-10

1993-03-23

Shay, David M.

Surgery

Instruments

Light application

606 2, 606 4, 606 10, 128897, 128898, A61H 506

Patent

active

051960060

ABSTRACT:
Methods and apparatus for determining the depth of excision generated by a material removal process, for determining the thickness of unablated material below the excision or incision, and for providing endpoint control of a material removal process utilize acoustic transducers for measuring the time delay between a first acoustic pulse resulting from material removal and a second acoustic pulse reflected from a distal surface or boundary layer of the material. The time delay between the two pulses detected by the transducer provides a measure of excision depth and of the depth of material below the excision. Endpoint control is provided by terminating material removal when a selected excision depth is detected. The invention can be used, for example, as a real-time monitor of excision depth and residual lamella thickness under the excision during laser corneal surgery.

REFERENCES:
patent: 4504727 (1985-03-01), Melcher et al.
patent: 4775028 (1988-10-01), de Heering
patent: 4862893 (1989-09-01), Martinelli
"Laser Acoustic Measurements for Remotely Determining Bathymetryin Shallow, Turbid Waters", by Hickman et al.; J. Acoust. Soc. Am.; vol. 73, No. 3, Mar. 1983, pp. 840-843.
Webster's Third New International Dictionary, Philip Gove et al., ed., G & C Merriam Co., Springfield, Mass., 1965, p. 762.
Dyer et al., "Nanosecond Acoustic Studies on Ultraviolet Laser Ablation of Organic Polymers", Applied Physics Letters, vol. 48, pp. 445-447, Feb. 10, 1986.

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