Powder dispersion apparatus, method of making and using the apparatus, and components that can be used on the apparatus and other devices

An apparatus, comprising:

• a support for supporting a receptacle comprising a blister having a wall;
• an outlet;
• a feed tube communicating with the outlet;
• and a mechanism configured to create at least one arc-shaped air inlet opening in a wall of the blister, the mechanism comprising a blade having a leading edge, wherein the leading edge comprises an elliptical leading edge having a rho value from 0.1 to 0.5, and a yaw value of 4 to 10 degrees as measured from a center and wherein the blade is configured and arranged to cut an opening in the wall of the blister wherein a smooth edge is produced.