Abstract
Conventional laser handpieces for medical laser equipment have some practical problems when used for treatment in such narrow fields of operation as body cavities. One of the greatest problems is that the location of the target for the laser is limited to some restricted parts of the surface of the subject region because of the fixed direction of the laser beam shot out from the laser handpieces. Another major problem is the difficulty of controling the field of laser exposure because a focul lens of a single focal length is used. The authors have developed two kinds of new laser handpieces with unigue functions as follows: one is a variable beam direction laser handpiece using a rotary reflector and another is a variable beam angle laser handpiece, both of which are extremely useful in laser surgery.
