MYRINGOTOMY-INSTRUMENT.

摘要

A hand-held myringotomy instrument comprises an otoscope (11) and an attached laser beam generator section (12). The laser beam generator section (12) comprises an adjustment system for moving the laser beam generator (26) of the section (12) along the laser beam axis, in order to adjust the position of the focus of the laser beam nearer, or farther from the instrument. This adjustment system includes an inner sleeve (34) carrying the generator and an outer sleeve (33) respectively inside and outside of a tube (30) connected to the otoscope. A pair of elements (41, 41a) diametrically opposed attached to the inner sleeve (34) project through longitudinal slots (45, 45a) diametrically opposed in the tube (30) and are externally threaded (40, 40a) to mesh with internal threads (39) on the outer sleeve (33). The slots (45, 45a) restrict the motion of the elements (41, 41a) to axial motion. Collars (49) restrict the motion of the outer sleeve (33) to rotational motion. Thus, rotation of the outer sleeve (33) causes longitudinal motion of the elements (41, 41a) which moves the laser beam lens system carried by the inner sleeve (34) axially along the laser beam axis as desired.