My aim was to devise a simple, easy, almost dangerless way in which to open the sphenoid sinus and remove part or all of the anterior wall, usually without removal of the middle turbinate, in order that one may have a better opportunity of investigating the sinus, looking into it with a nasopharyngoscope, washing it out, etc.
The Grayson burr partly answers this purpose. With this instrument the anterior sphenoidal wall can be trephined and the sinus washed out, or mopped out, thus demonstrating the presence or absence of pus, but the sinus cannot be inspected. I have, therefore, taken this burr, lengthened the shank and, at the opposite end, placed a rasp that can scrape bone and tissue on the pull. The rasp part of the instrument ends in a smooth, round extremity. With this burr and rasp an opening can be made in the anterior sphenoidal wall;