FEEDBACK-CONTROLLED SAFETY SYSTEM FOR LASER SURGERY

Abstract

In this paper we describe the feedback controlled safety system whose function is to prevent the mis-irradiation caused by the human errors.
The distance between the handpiece and the object is measured by detecting the reflected light from the object which is irradiated by He-Ne laser. If the measured distance becomes longer than the preset value,the irradiation of high energy laser is automatically stopped by the shutter.
The experimental results are following.
1. The preset region in which the laser irradiation was permitted is not affected by the difference of the reflectivity or the surface slope of the objects.
2. In the case of specular object such as a mirror, the irradiation of the laser beam is almost perfectly stopped even if the specular object is within the preset region.