I also cut my index finger, chipping the bone. It required 7 stitches. When I got back from urgent care....I finished cutting my fabric! I have been much more careful since then. I discovered that my problem was two-fold, 1) I had previously nicked my ruler and the cutter slid right over the nick and onto the top of the ruler, and 2) I was cutting waaaaay to fast! You also have to make sure your blade is sharp and not dull...that also can cause accidents!