| 摘要 |
A hand held myringotomy instrument comprises an otoscope and an attached laser beam generator section. The laser beam generator section comprises a portion for moving the laser beam generator of the section along the laser beam axis, in order to adjust the position of the focus of the laser beam nearer, or father from the instrument. Preferably, the moving portion includes an inner sleeve carrying the generator and an outer sleeve respectively inside and outside of a tube connected to the otoscope. A pair of elements diametrically opposed attached to the inner tube project through longitudinal slots diametrically opposed in the tube and are externally threaded to mesh with internal threads on the outer sleeve. The slots restrict the motion of the elements to axial motion. Collars restrict the motion of the outer sleeve to rotational motion. Thus, rotation of the outer sleeve causes longitudinal motion of the elements which moves the laser beam lens system carried by the inner sleeve axially along the laser beam axis as desired.
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