It is good that incidents involving a players a skate are not more frequent. But, they are not non existent. Clint Malarchuck, playing for the Buffalo Sabres in 1989, had his throat cut after an opposing player slid into the crease and collided with Malarchuk.
Taylor Hall was on the wrong end of his own teams skate when he went down during warm up and his teammate tried to jump over him, 30 stitches later, and Hall has a pretty gnarly scare on the left side of his forhead.
Most recently, in the KHL, in a game between Yekaterinburg and Traktor Chelyabinsk, Denis Sokolov was added to this unfortunate club. The incident is at around the 1:10 mark of the video after the jump.