Surgery – Truss – Pad
Patent
1979-10-15
1981-09-15
Henry, Jon W.
Surgery
Truss
Pad
350255, 1283031, 128395, 219121LS, 219121LV, 219121LZ, G02B 2714, G02B 2106
Patent
active
042893780
ABSTRACT:
A method of and an apparatus for adjusting the focal point of a working laser beam onto a microscopic target region of a transparent biological object to locate the focal point a spaced predetermined microscopic distance from an interface of the object is described. Separate working and auxiliary laser beams are produced which are then collinearly superimposed in parallel relationship, the auxiliary laser beam having a wavelength within the visible range and different from the wavelength of the working laser beam. The superimposed laser beams are focused jointly through the objective of a microscope onto the object. First variable focusing means placed in the path of one of the laser beams is controlled to produce a spacing between the focal spots equal to the predetermined distance. A further variable focusing means in the path of both the working and laser beams is controlled to jointly move the focal spots of both beams without varying the distance therebetween until the focal spot of the auxiliary laser beam appears on the interface of the object, whereby the working laser beam is focused the predetermined distance from the interface in the object.
REFERENCES:
patent: 3096767 (1963-07-01), Gresser et al.
patent: 3710798 (1973-01-01), Bredemeier
Remy Ernst
Unsold Eberhard
Henry Jon W.
Smith, Jr. John C.
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